CN110215854B - Micron-sized body bubble controllable generation method based on laser plasmon effect - Google Patents
Micron-sized body bubble controllable generation method based on laser plasmon effect Download PDFInfo
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- CN110215854B CN110215854B CN201910553521.2A CN201910553521A CN110215854B CN 110215854 B CN110215854 B CN 110215854B CN 201910553521 A CN201910553521 A CN 201910553521A CN 110215854 B CN110215854 B CN 110215854B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/05—Mixers using radiation, e.g. magnetic fields or microwaves to mix the material
- B01F33/054—Mixers using radiation, e.g. magnetic fields or microwaves to mix the material the energy being in the form of a laser to modify the characteristics or conditions of the products, e.g. for heating
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Abstract
The invention provides a micron-sized body bubble controllable generation method based on a continuous laser plasmon effect. Characterized in that the coating of the hydrophilic substance is based on continuous laser irradiationThe gold nano particle array substrate covered by the layer generates micron-sized bubbles on the surface of the substrate. By adjusting the laser turn-on time tonLaser off time toffAnd the laser intensity P, the dimension D of the micro-body bubbles and the distance D of the micro-body bubbles after the substrate is separated. The method has the advantages of good consistency of the sizes of the generated bubbles, capability of adjusting the sizes and the intervals of the bubbles and the like.
Description
Technical Field
The invention relates to a method for controllably generating a micro-body bubble based on a laser plasmon effect, in particular to a method for controlling the generation of the micro-body bubble by adjusting laser parameters.
Background
With the wide application of micro bubbles in biomedical diagnosis and cancer treatment, nano-manufacturing, mineral flotation and other fields, the micro bubbles have been attracting attention for centuries. In these applications, it has been desirable to control the generation of micro-body bubbles. For example, in the industrial separation to achieve mineral screening, appropriately sized bubbles can more effectively separate metal components. The application of the micro-body bubbles is fully developed, and the control of the size distribution of the micro-body bubbles is of great significance.
Aiming at the problem of realizing controllability of the generation of the micron-sized gas bubbles, a plurality of gas bubbles are generated, the most important mode is stirring action, the gas bubbles can be generated no matter in a mechanical vibration mode or an ultrasonic mode, but the gas bubbles are distributed more dispersedly; or a complicated bubble preparation device needs to be designed, and the generation of bubbles cannot be conveniently controlled.
Disclosure of Invention
The invention aims to provide a method for controllably generating the micro-body bubbles based on the laser plasmon effect aiming at the defects of the prior art, so that the growth process of the micro-body bubbles can be controlled, and the structure of a bubble preparation system is simpler.
To achieve the above object, the present invention comprises: a micrometer body bubble controllable generation method based on a laser plasmon effect is characterized in that a gold nanoparticle array substrate covered by a hydrophilic substance coating is irradiated based on continuous laser, and micrometer body bubbles are generated on the surface of the substrate. By adjusting the laser period tcycleMedium laser on duration tonDuration of closure toffAnd controlling the size D of the micro-body bubbles by using the laser intensity P, and separating the substrate by using the distance D of the micro-body bubbles.
The plasmon effect is that noble metal nano particles such as gold, silver, platinum and the like have a plasma effect under continuous laser irradiation, light energy can be rapidly converted into heat energy, and water can be rapidly vaporized by the converted heat energy in a liquid environment to generate micro bubbles.
The generated micro-body bubbles range in size from 1 μm to 999 μm.
The resulting micro-body bubble size D is the diameter of the micro-body bubble and remains substantially unchanged after separation of the substrate.
The size D change of the generated micro-body bubbles is the size change of the micro-body bubbles generated at the substrate.
The laser on duration tonAnd is characterized by the time interval from the laser on irradiation of the substrate surface to the laser off irradiation.
The laser off duration toffCharacterized in that the time interval between the laser being turned off to irradiate the substrate surface and the laser being turned on again.
The laser period tcycleFor the duration t of laser turn-ononAnd laser off duration toffAnd (4) summing.
The size D of the generated micro-bubbles varies, characterized in that the laser is turned on for a duration tonUnder the same conditions, the laser intensity P is continuously increased, and the size D of the micron bubble is continuously increased.
The generated micro-body bubble size D varies, characterized by the same laser off-duration t based on the same laser intensity PoffWith laser on duration tonThe size D of the micron-sized bubbles is continuously increased.
The distance d between the micrometer body bubbles after the substrate is separated is changed, and the method is characterized in that continuous micrometer body bubbles are formed under the periodic change of the laser opening and closing duration; based on the same laser intensity P, the same laser on duration tonWith laser off duration toffThe gas bubble spacing d of the micrometer bodies is continuously enlarged after the substrate is separated.
ADVANTAGEOUS EFFECTS OF INVENTION
Compared with the prior method, the method adjusts the laser intensity P and the laser turn-on duration tonAnd laser off duration toffThe size D of the micro-body bubbles and the distance D between the micro-body bubbles after the substrate is separated are controlled by the parameters, and the bubble generating device is simple and easy to operate.
Drawings
FIG. 1 is a schematic diagram of an apparatus for inducing micro-body bubbling in an embodiment of the present invention.
FIG. 2 shows the same laser ON duration t in an embodiment of the present inventiononDifferent laser off durations toffComparative schematic of micro-body bubble generation at parameters.
FIG. 3 shows the same laser turn-off duration t in an embodiment of the present inventionoffDifferent laser on duration tonComparative schematic of micro-body bubble generation at parameters.
FIG. 4 is a schematic diagram illustrating the generation of micro-bubbles under different laser intensity P parameters according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings.
Experiments that the inventors of the present invention have conducted, data results are given in the following examples.
Example 1
The invention is based on continuous laser irradiation of a gold nanoparticle array substrate covered by a hydrophilic substance coating, micron-sized bubbles are generated on the surface of the substrate, and a controllable generation method for controlling the micron-sized bubbles is realized by setting relevant parameters of laser. Fig. 1 is a schematic diagram of a device for inducing a micro-body bubble, which comprises a silicon dioxide substrate 1, a hydrophilic substance coating 2, a gold nanoparticle array 3, a micro-body bubble 4 and a laser emission device 5.
Example 2
According to FIG. 2, the laser turn-on duration is set to ton0.1s, laserLight off duration toff0.1s, 0.2s, 0.3s in sequence, corresponding to the cycle times t of (1), (2), (3) of FIG. 2cycleBecome larger in turn.
It was found that the same laser intensity P, the same laser on-duration tonDuration of laser off toffThe size of the generated micro-body bubbles is basically unchanged, and the distance D between the micro-body bubbles is continuously increased after the substrate is separated.
Experiments show that the interval d change of the micro-body bubbles and the laser closing duration time t after the substrate is separatedoffThis is illustrated by the micron body bubble vs growth trend of fig. 2 for the syntropy growth relationship.
Example 3
According to FIG. 3, the laser on-time t is seton0.1s, 0.3s, 0.5s, laser off duration toffAll of which are 0.1s, corresponding to the cycle time t of (1), (2) and (3) in the figure 3cycleBecome larger in turn.
It was found that the laser is on for a time tonThe size of the generated micro-body bubbles is continuously increased, the size D of the generated micro-body bubbles is continuously increased, and the distance D between the micro-body bubbles is kept unchanged after the substrate is separated.
Experiments show that the size D change of the generated micro-body bubble and the laser opening duration time tonThis is illustrated by the micro-volume bubble versus growth trend of fig. 3 for the syntropy growth relationship.
Example 4
According to FIG. 4, the laser on-time t is seton0.1s, laser off duration toff0.2s, laser intensity P of 80mW and 84mW respectively, corresponding to the cycle time t of (1), (2) and FIG. 4cycleThe time is fixed.
It was found that the generated micro-body bubble size D increases with increasing laser intensity P.
Experiments show that the size change of the generated micro-body bubble D and the laser intensity P are in the same-direction growth relationship and are consistent with the micro-body bubble generation comparison graph of fig. 4.
Claims (4)
1. A method for controllably generating a micro-body bubble based on a laser plasmon effect comprises the following steps:
irradiating the gold, silver and platinum noble metal nano particle array substrate covered by the hydrophilic substance coating based on continuous laser to generate micron-sized bubbles with gas inside on the surface of the substrate; based on laser on duration tonThe nucleation time of the micron body bubbles is within 0.5 s; forming continuous micron bubbles continuously separating the substrate under the periodical change of the laser on-off duration; based on the same laser on-duration tonIncreasing the laser intensity P, and increasing the size D of the micron bubble; based on the same laser intensity P, laser off duration toffBy increasing the laser on-duration tonThe size D of the micron-sized gas bubbles generated on the surface of the substrate is continuously increased; based on the same laser intensity P and laser turn-on duration tonIncreasing the laser off duration toffThe gas bubble spacing d of the micro-body after the substrate is separated becomes larger continuously.
2. The controllable generation method of the micro-body bubble based on the laser plasmon effect as claimed in claim 1, wherein the laser irradiation mode is continuous irradiation within the period time, and the wavelength range is 390-780 nm.
3. The controllable generation method of micro-bubbles based on laser plasmon effect as claimed in claim 1, wherein noble metal nanoparticles of gold, silver and platinum have plasma effect under laser irradiation, so that light energy can be rapidly converted into heat energy, and in a liquid environment, the converted heat energy can rapidly vaporize water to generate micro-bubbles.
4. The controllable generation method of the micro-body bubble based on the laser plasmon effect as claimed in claim 1, wherein the changes of the diameter D of the micro-body bubble are all size changes at the substrate, and the size D of the micro-body bubble remains substantially unchanged after the substrate is separated.
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