CN104880390A - Method for measuring performance parameters of micro-nano particles - Google Patents

Abstract

The invention discloses a method for measuring performance parameters of micro-nano particles. The method comprises the following steps: constructing a system for measuring performance parameters of micro-nano particles, wherein the system comprises a detection ware, a constant temperature control regulator, an ultrasonic module, a soundproofing module, a signal analysis and process module; the specific value of the backscatter intensity of free micro-nano particles in solid-liquid continuous phase medium for ultrasonic waves to the incident intensity of the free micro-nano particles in solid-liquid continuous phase medium for ultrasonic waves, and other parameters like the sound pressure, the particle concentration, the particle size, the medium viscosity and the medium density are utilized for calculating to obtain the characteristic mechanical parameters. According to the method for measuring performance parameters of micro-nano particles, the elastic coefficient and the surface tension of micro-nano particles can be precisely measured under the same measuring system and the same measuring environment, so that accurate experimental data is provided for study on the relation between the elastic coefficient and the surface tension, the properties of materials can be more deeply mastered, the service life of the materials is prolonged, and the quality of the materials is improved.

Description

A method for measuring performance parameters of micro-nano particles

technical field

The invention relates to the measurement of characteristic mechanical performance parameters of micro-nano particles, in particular to a method for measuring the performance parameters of micro-nano particles.

Background technique

The characteristic mechanical performance parameters of micro-nano particles, especially the surface tension and elastic coefficient, are closely related to the stability of the particles. By studying and testing the characteristic mechanical performance parameters of micro-nano particles, we can better study under what conditions micro-nano particles are the most stable and have the longest service life, and we can also obtain the maximum stable critical point of particles under the action of the outside world, etc. Important information, so that the particles can be used stably and for a long time by controlling the external conditions. Nanomaterials refer to solid materials composed of extremely fine particles with particle sizes on the order of nanometers (usually 1-100nm), and are usually divided into two levels: nanoparticles and nanosolids. Nanomaterials have been closely related to applications since they were recognized by people. The special effects of nanoparticles lead to the special properties of nanomaterials, and these special properties bring about the wide application of nanomaterials. At present, nanomaterials have been applied in catalysis, environmental protection, energy industry and new engineering, preparation of magnetic and protective materials, etc. The cross-infiltration of nanotechnology and electronics, medicine, biology, computer science and military science has produced new disciplines such as nanoelectronics, nanomedicine and other traditional disciplines prefixed with nano, showing a broader scope for nanomaterials. Application prospects, therefore, through the study of micro-nano particles, it has a huge effect on the development of micro-nano materials, and it is also in line with the country's key development targets.

Common measurement methods for existing particle surface tension and elastic coefficient:

1. Particle surface tension detection method:

(1) The contact angle measurement method, the condition satisfied when the liquid is balanced in a clean capillary is ρghπγ ² = 2πrγ _LA cosθ, where ρ is the density of the liquid, h is the rising height of the liquid in the capillary, r is the radius of the capillary, γ _LA is the surface tension coefficient of the liquid to be measured, and θ is the contact angle between the liquid and the capillary wall. The characteristic mechanical property parameters of the liquid at a specific temperature can be determined by measuring the contact angle, capillary diameter, and rising height of the liquid in the capillary by using the experimental instruments provided above.

Disadvantages: This detection method is applied to the detection of solid-liquid interface, and it is the detection of macromolecules. It cannot be used for the detection of micro-nano level and other contact surfaces.

(2) Drop weight method (drop volume method), when the liquid is dripped from the capillary dripper, the size of the droplet is related to the surface tension of the liquid, that is, the greater the surface tension, the larger the dropped droplet, there is a relationship between the two Mode:

W＝2πRγf (1)

γ=W/(2πRf) (2)

In the formula, W is the weight of the liquid drop; R is the radius of the dripper of the capillary, and its value is determined by the measuring instrument; f is the correction factor. It is more convenient to measure the droplet volume in the general laboratory, so formula (2) can be written as:

γ＝(Vρg/R)*(1/2πf) (3)

In the formula, V is the volume of the droplet; ρ is the density of the liquid; f is the correction factor. For a specific measuring instrument and liquid to be measured, R and ρ are fixed. During the measurement process, as long as the volume of a few drops of liquid is measured, the surface tension of the liquid can be calculated.

Disadvantages: a. It can only be regarded as an empirical method so far; b. It cannot be used to measure the surface tension that reaches equilibrium slowly, and at the same time, this method cannot achieve complete equilibrium; c. There are accurate determination of liquid volume and good control of liquid Droplet speed and other issues; d. It is only applicable to liquid, and at the same time, the particle size of the droplet cannot meet the micro-nano level.

(3) Capillary ascending method, a capillary is inserted into the liquid, and the liquid will rise along the capillary. After rising to a certain height, the liquid inside and outside the capillary will reach an equilibrium state, and the liquid will no longer rise. At this time, the upward pulling force exerted by the liquid on the liquid is equal to the total downward force of the liquid, then γ=1/2ρ ₁ -ρ _g ghr cosθ where γ is the surface tension; r is the radius of the capillary; h is The rising height of the liquid level in the capillary; ρ1 is the density _of the measured liquid; ρg is the density of the gas (air and steam); _g is the local acceleration of gravity; θ is the contact angle between the liquid and the tube wall. If the diameter of the capillary is very small and θ=0, the above formula can be simplified to γ=1/2ρghr.

Disadvantages: a. It is not easy to select a capillary with uniform inner diameter and accurately measure the inner diameter; b. It is not easy to measure the contact angle between the liquid and the tube wall; c. The purity of the solution will affect the measurement of surface tension to varying degrees. d. More liquid is needed to obtain a horizontal reference surface (it is generally considered that a liquid surface with a diameter of more than 10cm can be regarded as a plane), so the determination of the reference liquid level may cause errors; e. It is only suitable for the detection of liquids and cannot be used for gases, etc. detection, and can not reach the micro-nano level.

At present, there are many modern instrument methods, such as the maximum bubble pressure method, the differential maximum bubble pressure method, the Wilhelmy disk method, and the drop shape method. However, all the above-mentioned methods are for detecting the surface tension of the liquid, and cannot realize the detection of the surface tension of the micro-nano-scale material particles. Moreover, this detection method is only limited to liquid and gas conditions, and cannot test characteristic mechanical performance parameters in other environments.

2. Particle elastic coefficient detection method:

The atomic force microscope tests the elastic coefficient of material particles. The atomic force microscope is called AFM, that is, Atomic Force Microscope. In the AFM system, the force to be detected is the van der Waals force between atoms, so in this system, a tiny cantilever is used. Detects the amount of change in force between atoms. Cantilevers are usually fabricated from a silicon or silicon nitride wafer typically 100-500um long and approximately 500nm-5um thick. There is a sharp needle tip at the top of the microcantilever, which is used to detect the interaction force between the sample and the needle tip. The application of the force spectrum curve obtained by AFM in biomedicine: after detecting a cell, according to the resistance encountered, AFM will Give a numerical value indicating strength, which is the force spectrum of the particle, and through the deformation of the particle, use Young's modulus to obtain the corresponding elastic coefficient.

Disadvantages: The disadvantages of AFM are that the imaging range is too small, the speed is slow, and it is too much affected by the probe. This detection method is to detect in the air, which is relatively accurate, but when detecting liquid samples, due to the existence of solvent molecules, the detection of the probe will be seriously affected, and the detection accuracy cannot be guaranteed. At the same time, the purpose of this project cannot be achieved, let alone the two linked together.

At present, for the detection methods of micro-nano particles, especially the characteristic mechanical properties parameters of micro-nano particles in the free state in the liquid phase system, they cannot provide reliable, accurate and precise detection results, and many detection methods have no limit for the particle size lower limit. It cannot reach the micro-nano level, and is severely restricted by the external environment, and its applicable range is small.

Contents of the invention

In order to solve the problems existing in the prior art, the invention provides a method for measuring performance parameters of micro-nano particles.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a method for measuring performance parameters of micro-nano particles, comprising the following steps:

Step 10: Build a measurement system for the performance parameters of micro-nano particles, which includes:

The detection vessel is used to carry the micro-nano particles to be detected;

Constant temperature control regulator: used to control and adjust the temperature in the detection vessel to reach the required temperature value;

The ultrasonic module is used to transmit ultrasonic waves to the micro-nano particles, receive the ultrasonic echo signals reflected and scattered by the micro-nano particles, and transmit the ultrasonic echo signals to the information analysis and processing module;

Noise elimination module for absorbing redundant ultrasonic signals in the detection vessel;

The signal analysis and processing module is used to process the ultrasonic echo signal to obtain the backscattering intensity of the micro-nano particles, and obtain the surface tension and elastic coefficient of the micro-nano particles based on the characteristic formula;

Step 20: Prepare micro-nano particles, and record the number of micro-nano particles and the concentration of micro-nano particles;

Step 30: Place the solid-liquid continuous phase medium in the detection vessel, adjust the temperature in the vessel to reach the required temperature through a thermostat controller, and place the micro-nano particles in the solid-liquid continuous phase medium after the temperature is stable, And maintain a constant temperature in the detection vessel;

Step 40: Control the ultrasonic module to send ultrasonic waves of the required frequency to the micro-nano particles, record the applied sound pressure, observe and record the change of the radius of the micro-nano particles in real time;

Step 50: The ultrasonic module receives the ultrasonic echo signals reflected and scattered by the micro-nano particles, and transmits the ultrasonic echo signals to the information analysis and processing module; the signal analysis and processing module processes the ultrasonic echo signals to obtain the background of the micro-nano particles to the scattering intensity;

Step 60: The signal analysis and processing module obtains the surface tension and elastic coefficient of the micro-nano particles based on the characteristic formula.

On the basis of the above technical solutions, the present invention can also be improved as follows.

Further, in the step S60, the surface tension and elastic coefficient of the micro-nano particles are obtained based on the characteristic formula, which is specifically:

The elastic coefficient K _s is calculated by the following characteristic formulas (1) and (2):

$\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 9</span>}}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; NV\&Sigma;S</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; \&Sigma;S</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 9</span>}}{\mathrm{<span\; class="notranslate">\; K</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; \{</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; K</span>}}{\mathrm{<span\; class="notranslate">\; K</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Wherein, I _s is the backscattering intensity of micro-nanoparticles, I is the intensity of incident acoustic wave, N is the number of micro-nanoparticles, V is the volume of micro-nanoparticles, ΣS is the effective scattering area of a single scattering micro-nanoparticles, ρ _S is the density of the micro-nano particles, ρ _L is the density of the medium, K is the gas variability index, and R is the radius of the micro-nano particles changing with time;

The surface tension σ is given by the following characteristic formulas (3), (4), (5):

$\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; )</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; )</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Among them, ρ _L is the density of the medium, R is the radius of the particle changing with time, _{R 0} is the initial radius of the particle, PV is the internal pressure of the particle, η _L is the dynamic viscosity of the medium, P _O is the hydrostatic pressure, P _ac (t) is the sound pressure, c is the velocity of the ultrasonic wave in the medium, and P _G0 is the pressure inside the particle.

Further, the ultrasonic module includes a pulse generator receiver, a sending transducer, a receiving transducer, and a preamplifier; the signal analysis and processing module includes an oscilloscope and a computer;

The pulse generating receiver is used to provide a driving voltage for the transmitting transducer, and provide the ultrasonic echo signal amplified by the preamplifier to the oscilloscope for display;

The sending transducer is used to output ultrasonic waves of a corresponding frequency to micro-nano particles according to the driving voltage;

The receiving transducer receives ultrasonic echo signals reflected and scattered by micro-nano particles, and outputs the received ultrasonic echo signals to a preamplifier for amplification;

The computer is used to read the signal displayed on the oscilloscope, obtain the backscattering intensity of the micro-nano particles according to the ultrasonic echo signal, and obtain the surface tension and elastic coefficient of the micro-nano particles based on the characteristic formula.

The beneficial effect of the above-mentioned further technical scheme is: through the ultrasonic module composed of the pulse transmitting receiver, the transmitting/receiving transducer and the preamplifier, the ultrasonic wave can be transmitted and received, the integration of receiving and transmitting has been realized, and unnecessary The operation and equipment are troublesome. At the same time, according to the needs of the test, the ultrasonic frequency used can be changed at any time to realize the detection of ultrasonic waves of different frequencies. At the same time, the critical external force of different particles can be detected and the critical value of the particle can be determined. , When testing, it will not cause harm to the testing personnel.

Further, the detection vessel is a cylindrical water tank, and the sending transducer and the receiving transducer are installed on the top of the cylindrical water tank; the noise reduction module is correspondingly placed at the bottom of the cylindrical water tank, Used to absorb redundant ultrasonic signals in the cylindrical water tank.

The beneficial effect of the above further technical solution is: the sending transducer, the receiving transducer and the noise reduction module are arranged on the top and bottom of the cylindrical water tank oppositely, so that the noise reduction module can eliminate noise and clutter well, Improve and ensure the accuracy of detection.

Further, the sound-absorbing module is made of sound-absorbing materials such as sound-absorbing tiles or sound-absorbing cotton.

Further, the step S20 specifically includes: preparing micro-nano particles through micro-flow control preparation technology, using experimental equipment such as ultra-high-speed cameras, and recording the preparation of micro-nano particles to obtain the number of micro-nano particles, micro-nano particles concentration parameter.

The beneficial effect of the above further technical solution is: through the microfluidic preparation technology, the micro-nano level is achieved, and at the same time, the uniform size of most of the micro-nano particles is ensured, which ensures that the test particles have a good singleness. In addition, the use of Microfluidic technology can also change the size of particles to prepare particles of different sizes for testing the surface tension and elastic coefficient of particles of different sizes.

Further, the measurement method also includes the following steps:

Step 60: Control the ultrasonic module to send ultrasonic waves of the required frequency to the micro-nano particles to be detected, detect the critical point of the micro-nano particles by adjusting the sound pressure of the ultrasonic waves, and record the sound pressure at this time; adjust the frequency of the ultrasonic waves to detect At different frequencies, the sound pressure of micro-nano particles at the critical point;

Step 70: Regulate the temperature in the vessel through a thermostat controller, repeat step 60, and determine the critical point of micro-nano particles under optimal conditions.

The beneficial effects of the present invention are: the method of the present invention can realize accurate detection of the elastic coefficient and surface tension of micro-nano particles under the same test system and test environment, and provide accurate experimental data for studying the relationship between elastic coefficient and surface tension , so we can have a deeper understanding of the characteristics of the material and improve the service life and quality of the material. The invention uses ultrasonic waves for detection, and the ultrasonic waves have good tropism, strong penetrating ability, easy to obtain relatively concentrated sound energy, and can effectively propagate in media such as gas, liquid, solid, solid solution, etc.; can transmit strong energy, and will Produce reflection, interference, superposition and resonance phenomenon, when propagating in liquid medium, can produce strong shock and cavitation phenomenon on the interface; Therefore, the method of the present invention will not be subject to the restriction of detection medium and detection object, make The invention has wide application.

In addition, in the method of the present invention, a stable test environment is provided through a constant temperature water tank, which will not be restricted and affected by the external environment and conditions, and the redundant ultrasonic waves are absorbed through the noise reduction module, which can effectively reduce ultrasonic noise. Interference such as waves ensures the accuracy of the test; through the ultrasonic module composed of pulse sending receiver, sending/receiving transducer, and preamplifier, ultrasonic waves can be transmitted and received, realizing the integration of receiving and transmitting, reducing the Unnecessary operation and equipment troubles. At the same time, according to the needs of the test, the ultrasonic frequency used can be changed at any time to realize the detection of ultrasonic waves of different frequencies. At the same time, the critical external force of different particles can be detected to determine the particle size. The critical value will not cause harm to the testing personnel during testing.

In addition, the method of the present invention can also measure the critical point of micro-nano particles under different conditions, and can directly control the rupture of particles by determining the critical point of micro-nano particles under optimal conditions, especially in the field of medicine, which can be widely used , which is conducive to the research of micro-nano materials.

Description of drawings

Figure 1 is a schematic structural diagram of a measurement system for performance parameters of micro-nano particles.

Detailed ways

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

A method for measuring performance parameters of micro-nano particles of the present invention comprises the following steps:

Step S10: Build a measurement system for the performance parameters of micro-nano particles. FIG. 1 is a schematic structural diagram of the measurement system for the performance parameters of micro-nano particles; as shown in FIG. Micro-nano particles 4; constant temperature control regulator: used to adjust the temperature in the detection vessel 1; ultrasonic module, used to transmit ultrasonic waves to the micro-nano particles 4, receive ultrasonic echo signals reflected and scattered by the micro-nano particles 4, and The ultrasonic echo signal is transmitted to the information analysis and processing module; the noise elimination module 3 is used to absorb the redundant ultrasonic signal in the detection vessel 1; the signal analysis and processing module is used to process the ultrasonic echo signal to obtain the background of the micro-nano particle 4 Scattering intensity, and based on the characteristic formula to obtain the surface tension and elastic coefficient of the micro-nano particle 4.

In this specific embodiment, the ultrasonic module includes a pulse generation receiver, a sending transducer, a receiving transducer, and a preamplifier; the signal analysis and processing module includes an oscilloscope and a computer; the pulse generation receiver is used for sending a transducer The device provides the driving voltage, and provides the ultrasonic echo signal amplified by the preamplifier to the oscilloscope for display; the sending transducer is used to output the ultrasonic wave of the corresponding frequency to the micro-nano particle 4 according to the driving voltage; the receiving The transducer, which receives the ultrasonic echo signal reflected and scattered by the micro-nano particle 4, and outputs the received ultrasonic echo signal to the preamplifier for amplification; the computer, which is used to read the signal displayed on the oscilloscope , the backscattering intensity of the micro-nanoparticle 4 is obtained according to the ultrasonic echo signal, and the surface tension and elastic coefficient of the micro-nanoparticle 4 are obtained based on the characteristic formula. In this specific embodiment, the detection vessel 1 is a cylindrical water tank, and the sending transducer and the receiving transducer are installed on the front wall of the cylindrical water tank; the noise reduction module 3 is correspondingly placed at the bottom of the cylindrical water tank for Absorbing redundant ultrasonic signals in the cylindrical water tank can well eliminate the interference of noise and clutter, and improve and ensure the accuracy of detection.

Step 20: Prepare micro-nano particles 4, and record the number of micro-nano particles 4 and the concentration of micro-nano particles 4; Step S20 is specifically: prepare micro-nano particles 4 by micro-fluidic control preparation technology, use ultra-high-speed cameras, pass through The records of the preparation of micro-nano particles 4 obtained the number of micro-nano particles 4 and the concentration parameters of micro-nano particles 4; the use of micro-fluidic preparation technology reached the micro-nano level, ensuring the uniform size of most of the micro-nano particles 4, It ensures that the test particles have a good singleness. In addition, using microfluidic technology, the size of the particles can also be changed to prepare particles of different sizes, which are used to detect the surface tension and elastic coefficient of particles of different sizes.

Step 30: Place the solid-liquid continuous phase medium 2 in the detection vessel 1, adjust the temperature in the vessel to the required temperature through a thermostatic controller, and place the micro-nano particles 4 in the solid-liquid continuous phase after the temperature is stable medium 2, and maintain a constant temperature in the detection vessel 1. Through the constant temperature controller, the detection can be kept in a stable environment at all times, and the influence of the external environment on the detection results can be effectively avoided. At the same time, the detection at different temperatures can be realized by adjusting the temperature of the constant temperature water tank. At different temperatures and different states of the particles, the specific situation of the particles can be obtained, which is conducive to the comprehensive detection of particles without being affected by the external environment and conditions, ensuring the accuracy of the test; using the solid-liquid continuous phase medium 2 can The motion parameters of micro-nano particles in the medium are continuous functions of space points and time, so mathematical tools can be used to solve their performance parameters; in addition, ultrasonic waves have no obvious attenuation in solid-liquid continuum media, and have no effect on the detection effect and echo intensity. Small impact.

Step 40: Control the ultrasonic module to send ultrasonic waves of the required frequency to the micro-nanoparticles 4, record the applied sound pressure, and observe and record the change of the radius of the micro-nanoparticles 4 in real time; specifically, in this embodiment, a pulse generator receiver is used , Transmitting transducers, receiving transducers, and preamplifiers are used as ultrasonic modules, which can send ultrasonic waves of a specific frequency and achieve reception, ensuring the singleness of frequency and the accuracy of detection, and can be detected by different frequencies. Determine the stability and mechanical properties of particles under different frequencies and sound pressure conditions without being limited, and more accurate test results can be obtained.

Step 50: The ultrasonic module receives the ultrasonic echo signal reflected and scattered by the micro-nano particle 4, and transmits the ultrasonic echo signal to the information analysis and processing module; the signal analysis and processing module processes the ultrasonic echo signal to obtain the micro-nano particle 4 In the present embodiment, the signal analysis and processing module includes an oscilloscope and a computer; the oscilloscope is used to display the ultrasonic echo signal, and the computer is used to read the signal displayed on the oscilloscope, and obtain the microwave according to the ultrasonic echo signal. the backscattering intensity of the nanoparticles 4;

Step 60: The signal analysis and processing module obtains the surface tension and elastic coefficient of the micro-nano particles 4 based on the characteristic formula. In the step S60, the surface tension and elastic coefficient of the micro-nano particles 4 are obtained based on the characteristic formula, which is specifically:

The elastic coefficient K _s is calculated by the following characteristic formulas (1) and (2):

$\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 9</span>}}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; NV\&Sigma;S</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; \&Sigma;S</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 9</span>}}{\mathrm{<span\; class="notranslate">\; K</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; \{</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; K</span>}}{\mathrm{<span\; class="notranslate">\; K</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Wherein, I _s is the backscattering intensity of micro-nanoparticles, I is the intensity of incident acoustic wave, N is the number of micro-nanoparticles, V is the volume of micro-nanoparticles, ΣS is the effective scattering area of a single scattering micro-nanoparticles, ρ _S is the density of the micro-nano particles, ρ _L is the density of the medium, K is the gas variability index, and R is the radius of the micro-nano particles changing with time;

The surface tension σ is given by the following characteristic formulas (3), (4), (5):

$\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; )</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>$

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

$<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>{\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; )</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Among them, ρ _L is the density of the medium, R is the radius of the particle changing with time, _{R 0} is the initial radius of the particle, PV is the internal pressure of the particle, η _L is the dynamic viscosity of the medium, P _O is the hydrostatic pressure, P _ac (t) is the sound pressure, c is the velocity of the ultrasonic wave in the medium, P _G0 is the pressure inside the particle, and

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

The above characteristic equation (3) is the Rayleigh-Plesset equation (i.e. the Rayleigh-Jins equation). The Rayleigh-Plesset equation was first proposed by Lord Rayleigh (Rayleigh), and is used to analyze the mechanical properties of particles such as dynamic pressure and surface tension. characteristic equation;

Above-mentioned characteristic equation (4) is Herring equation (being Herring's formula); Characteristic equation (5) is Keller-Miksis equation (being Keller-Miksis equation); Herring equation and Keller-Miksis equation are Prosperetti (Prosperetti Peretti) first proposed that it is suitable for solving the surface tension value in the case of particle vibration caused by radius attenuation.

The measurement method also includes the steps of:

Step 60: Control the ultrasonic module to send ultrasonic waves of the required frequency to the micro-nanoparticles 4 to be detected, detect the critical point of the micro-nanoparticles 4 by adjusting the sound pressure of the ultrasonic waves, and record the sound pressure at this time; adjust the frequency of the ultrasonic waves, Detect the sound pressure when the micro-nano particle 4 is at the critical point at different frequencies; in this embodiment, specifically, the pulse transmitter receiver of the ultrasonic module provides the driving voltage, and converts it into the required voltage through the transmitter transducer. Frequency of ultrasonic waves, the sending transducer is vertically aligned with the micro-nano particles 4 to be detected, by adjusting the sound pressure of the ultrasonic waves, the critical point of the micro-nano particles 4 is detected, the sound pressure at this time is recorded, and its Carry out relevant calculations; adjust the frequency of the sending transducer, and then adjust the sound pressure of the ultrasonic wave at different frequencies to detect the different critical points of the micro-nanoparticles 4 under different ultrasonic frequencies, and record it;

Step 70: Adjust the temperature in the vessel through a thermostat controller, repeat step 60, and determine the critical point of micro-nanoparticles 4 under optimal conditions.

The method of the present invention uses the ratio of the backscattering intensity of free micro-nano particles to ultrasonic waves in the solid-liquid continuous phase medium to the incident intensity, as well as parameters such as sound pressure, particle concentration, particle size, medium viscosity, and medium density to calculate the particle density. Characteristic mechanical parameters; can better understand the characteristics of micro-nano particles. By detecting the elastic coefficient and surface tension of the particles, as well as the settings of different parameters, it is possible to better study the conditions under which the particles are the most stable and have the longest service life. , and can directly control the breakage of particles by determining the critical point of micro-nano particles under the optimal conditions, especially in the medical field, which is more widely used, which is beneficial to the research of micro-nano materials.

The implementation steps and methods described above only express an implementation mode of the present invention, and the description is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present invention. Under the premise of not departing from the concept of the patent of the present invention, the deformation and improvement made should all belong to the protection scope of the patent of the present invention.

Claims (7)

1. A method for measuring performance parameters of micro-nanoparticles, characterized in that, comprising the steps: Step 10: Build a measurement system for the performance parameters of micro-nano particles, which includes: The detection vessel is used to carry the micro-nano particles to be detected; Constant temperature control regulator: used to control and adjust the temperature in the detection vessel to reach the required temperature value; The ultrasonic module is used to transmit ultrasonic waves to the micro-nano particles, receive the ultrasonic echo signals reflected and scattered by the micro-nano particles, and transmit the ultrasonic echo signals to the information analysis and processing module; Noise elimination module for absorbing redundant ultrasonic signals in the detection vessel; The signal analysis and processing module is used to process the ultrasonic echo signal to obtain the backscattering intensity of the micro-nano particles, and obtain the surface tension and elastic coefficient of the micro-nano particles based on the characteristic formula; Step 20: Prepare micro-nano particles, and record the number of micro-nano particles and the concentration of micro-nano particles; Step 30: Place the solid-liquid continuous phase medium in the detection vessel, adjust the temperature in the vessel to reach the required temperature through a thermostat controller, and place the micro-nano particles in the solid-liquid continuous phase medium after the temperature is stable, And maintain a constant temperature in the detection vessel; Step 40: Control the ultrasonic module to send ultrasonic waves of the required frequency to the micro-nano particles, record the applied sound pressure, observe and record the change of the radius of the micro-nano particles in real time; Step 50: The ultrasonic module receives the ultrasonic echo signals reflected and scattered by the micro-nano particles, and transmits the ultrasonic echo signals to the information analysis and processing module; the signal analysis and processing module processes the ultrasonic echo signals to obtain the background of the micro-nano particles to the scattering intensity; Step 60: The signal analysis and processing module obtains the surface tension and elastic coefficient of the micro-nano particles based on the characteristic formula. 2. according to the measuring method of a kind of micro-nanoparticle performance parameter described in claim 1, it is characterized in that: in the described step S60, obtain surface tension and elastic coefficient of micro-nanoparticle based on characteristic formula, it is specifically: elastic coefficient K _s is calculated from the following characteristic formulas (1) and (2): $\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}{\mathrm{<span\; class="notranslate">\; I</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 9</span>}}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; NV\&Sigma;S</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$ $\mathrm{<span\; class="notranslate">\; \&Sigma;S</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 9</span>}}{\mathrm{<span\; class="notranslate">\; K</span>}}^{\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}^{\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; \{</span>{\frac{{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; K</span>}}{\mathrm{<span\; class="notranslate">\; K</span>}}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 3</span>}}{<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; S</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$ Among them, I _s is the backscattering intensity of micro-nanoparticles, I is the intensity of incident acoustic wave, N is the number of micro-nanoparticles, V is the volume of micro-nanoparticles, ΣS is the effective scattering area of a single scattering micro-nanoparticles, ρ _S is the density of micro-nano particles, ρ _L is the density of the medium, K is the gas variability index, and R is the radius of the micro-nano particles changing with time; The surface tension σ is given by the following characteristic formulas (3), (4), (5): $\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$ $<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; )</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$ $<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>\mathrm{<span\; class="notranslate">\; R</span>}\frac{{<span\; class="notranslate">\; \&PartialD;</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}\mathrm{<span\; class="notranslate">\; R</span>}}{{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 4</span>}\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; )</span>{<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; c</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; R</span>}}{\mathrm{<span\; class="notranslate">\; c</span>}}\frac{\mathrm{<span\; class="notranslate">\; d</span>}}{\mathrm{<span\; class="notranslate">\; dt</span>}}<span\; class="notranslate">\; )</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{{\mathrm{<span\; class="notranslate">\; \&rho;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; G</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; R</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 3</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; V</span>}}<span\; class="notranslate">\; -</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&eta;</span>}}_{\mathrm{<span\; class="notranslate">\; L</span>}}\frac{\frac{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; R</span>}}{<span\; class="notranslate">\; \&PartialD;</span>\mathrm{<span\; class="notranslate">\; t</span>}}}{\mathrm{<span\; class="notranslate">\; R</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; ac</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$ Among them, ρ _L is the density of the medium, R is the radius of the particle changing with time, _{R 0} is the initial radius of the particle, PV is the internal pressure of the particle, η _L is the dynamic viscosity of the medium, P _O is the hydrostatic pressure, P _ac (t) is the sound pressure, c is the velocity of the ultrasonic wave in the medium, and P _G0 is the pressure inside the particle. 3. according to the measuring method of a kind of micronano particle performance parameter described in claim 1 or 2, it is characterized in that: The ultrasonic module includes a pulse generator receiver, a sending transducer, a receiving transducer, and a preamplifier; the signal analysis and processing module includes an oscilloscope and a computer; The pulse generating receiver is used to provide a driving voltage for the transmitting transducer, and provide the ultrasonic echo signal amplified by the preamplifier to the oscilloscope for display; The sending transducer is used to output ultrasonic waves of a corresponding frequency to micro-nano particles according to the driving voltage; The receiving transducer receives ultrasonic echo signals reflected and scattered by micro-nano particles, and outputs the received ultrasonic echo signals to a preamplifier for amplification; The computer is used to read the signal displayed on the oscilloscope, obtain the backscattering intensity of the micro-nano particles according to the ultrasonic echo signal, and obtain the surface tension and elastic coefficient of the micro-nano particles based on the characteristic formula. 4. The measuring method of a kind of micro-nano particle performance parameter according to claim 3, is characterized in that: described detection vessel is cylindrical water tank, and described sending transducer and receiving transducer are installed in described cylindrical water tank the top of the tank; the sound-absorbing module is correspondingly placed at the bottom of the cylindrical water tank for absorbing redundant ultrasonic signals in the cylindrical water tank. 5. The method for measuring performance parameters of micro-nano particles according to claim 1 or 2, characterized in that: the noise-absorbing module is an anechoic tile or an anechoic cotton. 6. According to claim 1 or 2, a method for measuring performance parameters of micro-nano particles is characterized in that, said step S20 is specifically: preparing micro-nano particles through micro-fluidic control preparation technology, using an ultra-high-speed camera, by The number of micro-nano particles and the concentration parameters of micro-nano particles are obtained by recording the preparation of micro-nano particles. 7. according to claim 1 or 2 described a kind of measuring method of micro-nano particle performance parameter, it is characterized in that: this measuring method also comprises the following steps: Step 60: Control the ultrasonic module to send ultrasonic waves of the required frequency to the micro-nano particles to be detected, detect the critical point of the micro-nano particles by adjusting the sound pressure of the ultrasonic waves, and record the sound pressure at this time; adjust the frequency of the ultrasonic waves to detect At different frequencies, the sound pressure of micro-nano particles at the critical point; Step 70: Regulate the temperature in the vessel through a thermostat controller, repeat step 60, and determine the critical point of micro-nano particles under optimal conditions.