WO2022234680A1 - 微細気泡分散液の測定方法及び測定システム - Google Patents
微細気泡分散液の測定方法及び測定システム Download PDFInfo
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Definitions
- the present invention relates to a measurement method and measurement system for a fine bubble dispersion. More particularly, the present invention relates to a measuring method and a measuring system for measuring properties of a microbubble dispersion containing microbubbles.
- microbubbles with nano-order particle diameters (hereinafter also referred to as "diameter nano-level bubbles") in a dispersion liquid are mainly driven by Brownian motion, so they stay in water for a long period of time (for example, several years). have the property of For this reason, in recent years, extensive research has been conducted on fine bubble dispersions in which diameter nano-level bubbles are dispersed (see, for example, Patent Document 1).
- microbubbles in a general microbubble dispersion can be relatively easily confirmed by the cloudiness of the water.
- the diameter of nano-level bubbles is about the same as or smaller than the wavelength of light, it is impossible to visually confirm the presence or absence of diameter nano-level bubbles in the fine bubble dispersion liquid.
- a technique for optically measuring the concentration and particle size distribution of fine particles that undergo Brownian motion for example, a dynamic light scattering method, a particle trajectory tracking method, etc. It has been known.
- a dynamic light scattering method and the particle trajectory tracking method laser light is irradiated into a dispersion liquid of fine particles, and the concentration and particle size distribution of the fine particles are measured by using the light scattered by the fine particles.
- the fine bubble dispersion may contain not only nano-sized bubbles but also nano-order fine solid particles as impurities.
- the conventional method for measuring a dispersion of fine particles although it is possible to recognize nano-order fine particles contained in the dispersion, it is not possible to distinguish whether they are nano-sized bubbles or solid particles. I didn't.
- An object of the present invention is to provide a measurement method and a measurement system for a fine bubble dispersion that can appropriately measure the characteristics of a fine bubble dispersion while distinguishing fine objects in the dispersion into fine bubbles and solid particles. .
- a method for measuring a microbubble dispersion liquid according to the present invention is a method for measuring characteristics of a test liquid that is a microbubble dispersion liquid, and illuminates the test liquid held by a holding device.
- a variable magnetic field application step of applying a time-varying variable magnetic field to the sample liquid in the irradiation area of the illumination light; and scattering caused by fine particles contained in the sample liquid by the irradiation of the illumination light and a scattered light detection step of detecting light with a photodetector, wherein minute objects are distinguished into microbubbles and solid particles based on the brightness of the scattered light detected by the photodetector.
- the test liquid preferably contains microbubbles with a particle size within the range of 2 [nm] or more and less than 2000 [nm].
- the scattered light detection step by detecting the scattered light with the photodetector before and after applying the varying magnetic field, an image of the trajectory of the minute object due to Brownian motion is obtained, and the measuring method In the image acquired by the photodetector, it is preferable to distinguish between solid particles and microbubbles based on whether or not there is an increase in luminance when the varying magnetic field is applied.
- the measurement method includes a solid particle measurement step of calculating at least one of the concentration and particle size distribution of solid particles contained in the test liquid based on the image acquired by the photodetector. Further, it is preferable to have.
- the measuring method includes calculating at least one of the concentration and particle size distribution of non-charged microbubbles contained in the test liquid based on the image acquired by the photodetector. It is preferable to further include an electrostatic microbubble measurement step.
- an image before application which is an image of a trajectory of a minute object due to Brownian motion before applying the varying magnetic field, and an image due to Brownian motion while the varying magnetic field is being applied and an image during application, which is an image of the trajectory of the fine matter. It is preferable to further include an electrostatic microbubble measurement step of calculating at least one of the diameter distributions.
- the measurement method preferably further includes a first screening step of passing the test liquid through a positively charged filter before holding the test liquid by the holding device.
- the measurement method further includes an electric field applying step of applying an electric field to the sample liquid within the irradiation area of the illumination light, and in the scattered light detecting step, while the electric field is applied It is preferable to obtain an image when an electric field is applied, which is an image of the trajectory of fine particles by electrophoresis in , and measure the physical properties of the solid particles contained in the test liquid based on the image when the electric field is applied.
- the measurement method includes applying a static magnetic field to the test liquid before applying the variable magnetic field to move at least a portion of the solid particles in the test liquid out of the irradiation area. It is preferable to further include a second screening step of moving.
- the measuring method preferably further comprises a paramagnetic substance amount measuring step of measuring the amount of paramagnetic solid particles collected by applying the static magnetic field in the second screening step.
- the light source of the illumination light is a laser device, and the laser device switches the wavelength of the laser light between a plurality of values defined within a range of 300 [nm] or more and less than 700 [nm]. Preferably possible.
- a system for measuring a microbubble dispersion liquid measures the characteristics of a test liquid that is a microbubble dispersion liquid, and includes a holding device that holds the test liquid, and a holding device that holds the test liquid.
- a light source for irradiating illumination light onto the sample liquid
- a variable magnetic field applying device for applying a time-varying variable magnetic field to the sample liquid in an irradiation area of the illumination light, and irradiation with the illumination light
- a photodetector that detects scattered light generated from fine particles contained in a test solution, and a fine particle that is distinguished into microbubbles and solid particles based on the brightness of the scattered light detected by the photodetector.
- a measuring device for measuring characteristics of the test solution.
- the sample liquid held by the holding device is irradiated with illumination light, and the sample liquid in the irradiation area of the illumination light is time-varying.
- a fluctuating magnetic field is applied, and further scattered light generated from microscopic objects contained in the sample liquid is detected by a photodetector due to irradiation of this illumination light.
- the sample liquid which is a microbubble dispersion liquid, may contain fine solid particles in addition to microbubbles.
- the measuring method according to the present invention minute substances and solid particles in the sample liquid are distinguished based on the brightness of the scattered light detected by the photodetector. Therefore, according to the measuring method of the present invention, it is possible to accurately measure the characteristics of the liquid to be tested while distinguishing the microscopic substances contained in the liquid to be tested into microbubbles and solid particles.
- a microbubble dispersion liquid containing nano-level bubbles having a particle diameter within the range of 2 [nm] or more and less than 2000 [nm] is measured.
- the fine bubble dispersion liquid contains solid particles having a particle diameter similar to that of the nano-level bubbles, these solid particles and the nano-level bubbles It is possible to accurately measure the characteristics of the test liquid while distinguishing between and.
- the microscopic object in the image of the microscopic object acquired by the photodetector, the microscopic object is distinguished into solid particles and microbubbles by comparing the luminance with a predetermined threshold value. As a result, it is possible to distinguish between solid particles and microbubbles in a simple manner.
- an image of the trajectory of a minute object due to Brownian motion is obtained by detecting scattered light before and after applying a varying magnetic field.
- Microscopic objects are distinguished into solid particles and microbubbles based on the presence or absence of an increase in luminance when a magnetic field is applied. As a result, it is possible to identify whether the fine particles are solid particles or microbubbles while tracking the movement of the fine particles due to Brownian motion.
- the fine substances contained in the fine bubble dispersion liquid are divided into fine solid particles and fine bubbles. It is divided into two types of microbubbles.
- a varying magnetic field is applied as described above, the solid particles with uneven magnetic permeability rotate on their own axes, the charged microbubbles disappear, and the non-charged microbubbles do not rotate.
- minute objects whose brightness increases when a varying magnetic field is applied are identified as solid particles, and minute matter that disappears when a varying magnetic field is applied are charged microbubbles.
- microscopic objects whose brightness did not increase when a varying magnetic field was applied are identified as non-charged microbubbles.
- the characteristics of the sample liquid can be measured with high accuracy while distinguishing the minute substances contained in the sample liquid into solid particles, charged microbubbles, and non-charged microbubbles.
- the measurement method according to the present invention comprises a solid particle measurement step of calculating at least one of the concentration and particle size distribution of solid particles contained in the test liquid based on the image acquired by the photodetector. .
- concentration and particle size distribution of the solid particles contained in the sample liquid can be accurately measured while distinguishing them from microbubbles.
- the measurement method according to the present invention is a method of calculating at least one of the concentration and particle size distribution of non-charged microbubbles contained in the test liquid based on the image acquired by the photodetector. and a microbubble measurement step.
- the measurement method according to the present invention in the scattered light detection step, the pre-application image, which is an image of the trajectory of minute objects due to Brownian motion before applying the varying magnetic field, and the Brownian and an application-in-progress image, which is an image of the trajectory of the minute object due to the motion.
- the measurement method according to the present invention includes a chargeable microbubble measurement step of calculating at least one of the concentration and particle size distribution of the chargeable microbubbles contained in the test liquid based on the pre-application image and the during-application image. Prepare. As a result, the concentration and particle size distribution of charged microbubbles contained in the sample liquid can be accurately measured while distinguishing them from solid particles and non-charged microbubbles.
- the number of rotations of solid particles when a varying magnetic field is applied has a correlation with the magnitude of change in brightness of scattered light.
- the number of rotations of the solid particles when a varying magnetic field is applied also correlates with the particle size of the solid particles. Therefore, in the present invention, utilizing the correlation between the magnitude of change in brightness of scattered light and the particle size of solid particles as described above, in an image of a minute object acquired by a photodetector, when a fluctuating magnetic field is applied, The particle size of the solid particles is calculated based on the magnitude of the luminance change. Thereby, the particle size of solid particles can be measured by a simple method.
- the measurement method according to the present invention applies a static magnetic field to the sample liquid before applying a varying magnetic field to move at least a portion of the solid particles in the sample liquid out of the irradiation area of the illumination light. move to As a result, the paramagnetic particles among the numerous solid particles contained in the sample liquid can be moved out of the irradiation area, so that the measurement accuracy can be further improved.
- the paramagnetic solid particles are moved out of the irradiation area by applying a static magnetic field as described above, and the amount of paramagnetic solid particles collected thereby is measured. do. Thereby, the amount of paramagnetic solid particles contained in the sample liquid can be measured by a simple method.
- the rotational speed of the solid particles when a varying magnetic field is applied changes according to the physical properties and shape of the solid particles, the viscosity of the medium, and the like.
- the brightness of the scattered light changes depending on the rotation speed of the solid particles and the wavelength of the irradiation light. Therefore, if the wavelength of the irradiation light is fixed, the brightness of the scattered light may not increase sufficiently or may be saturated.
- a laser device capable of switching the wavelength of the laser light with a plurality of values within the range of 300 [nm] or more and less than 700 [nm] is used as the light source of the irradiation light.
- the wavelength of the laser light can be switched accordingly to reduce the scattered light. Light intensity changes can be measured appropriately.
- a system for measuring a fine bubble dispersion liquid includes a holding device for holding a sample liquid, a light source for irradiating the sample liquid held by the holding device with illumination light, and the illumination light.
- a variable magnetic field applying device that applies a time-varying variable magnetic field to a sample liquid in an irradiation area, a photodetector that detects scattered light generated from fine particles contained in the sample liquid by irradiation with illumination light, and light and a measuring device for measuring properties of the sample liquid by distinguishing microscopic objects into microbubbles and solid particles based on the brightness of the scattered light detected by the detection device.
- FIG. 10 is a diagram showing another example of a holding device;
- FIG. 10 is a diagram showing another example of a holding device;
- FIG. 10 is a diagram showing another example of a holding device;
- It is a perspective view of a double-coil type coil pad.
- 4 is a flow chart showing a specific procedure of a measuring method for measuring properties of a fine bubble dispersion.
- 4 is a flow chart showing a procedure for calculating the concentration and particle size distribution of fines in a measuring device.
- FIG. 4 is a diagram showing an example of an image of a minute object obtained by detecting scattered light of laser light with a digital microscope;
- FIG. 6 is a diagram schematically showing a configuration of part of a measurement system according to a second embodiment of the present invention;
- FIG. 4 is a flow chart showing a specific procedure of a measuring method for measuring properties of a fine bubble dispersion.
- FIG. 10 is a diagram schematically showing a configuration of part of a measurement system according to a third embodiment of the present invention; It is a figure which shows an example of the particle size calculation map of a solid particle.
- the measurement system 1 uses a microbubble dispersion liquid in which microbubbles are dispersed in a fluid medium as a test liquid, and measures the properties of the test liquid (for example, the particle size distribution and the number of microbubbles dispersed in the test liquid). concentration, etc.).
- a nanobubble dispersion liquid in which microbubbles, solid particles, etc. having a particle size within the range of 2 [nm] or more and less than 2000 [nm] are dispersed in a medium is used as a sample liquid.
- fine bubbles and solid particles are also collectively referred to as fine matter.
- the medium may be any fluid in which microbubbles are dispersed.
- the measurement system 1 includes a microcapillary 2 as a holding device for holding a sample liquid, a laser device 3 as a light source for irradiating the sample liquid in the microcapillary 2 with a laser beam L as illumination light, and a laser beam.
- a fluctuating magnetic field applying device 5 for applying a fluctuating magnetic field to the test liquid in the irradiation area A of L, and a light detection device for detecting the scattered light S generated from the fine matter contained in the test liquid by the irradiation of the laser light L.
- a microcapillary 2 formed with micrometer-level ducts as shown in FIG. 1 is used as a holding device for holding a test liquid, but the present invention is not limited to this.
- a holding device for holding the test liquid any device capable of holding the test liquid by utilizing capillary action such as the microcapillary 2 may be used. 21 (see FIG. 2A), a pair of laminated glass plates 22 (see FIG. 2B) spaced at micrometer level, and polymer parallel threads 23 (see FIG. 2C) spaced at micrometer level. may be used.
- the laser device 3 generates laser light L with a wavelength within the range of, for example, 300 [nm] or more and less than 700 [nm], and irradiates the irradiation area A defined inside the capillaries of the microcapillary 2 . It is preferable that the laser device 3 be capable of switching the wavelength of the laser light L between two or more values within the range of 300 [nm] or more and less than 700 [nm].
- a light emitting diode may be used as the light source.
- the fluctuating magnetic field application device 5 includes a coil pad 51 that can be gripped and operated by an operator, and a main body 52 that generates a fluctuating magnetic field from the coil pad 51 in a predetermined cycle.
- the period and magnetic flux density of the fluctuating magnetic field can be set within a predetermined range. Therefore, in the fluctuating magnetic field application device 5, it is possible to generate a static magnetic field by setting the period of the fluctuating magnetic field to be infinite.
- a case of selectively applying both a varying magnetic field and a static magnetic field to the irradiation area A of the laser beam L in the microcapillary 2 by using the varying magnetic field applying device 5 will be described. is not limited to this.
- a magnet prepared in advance separately from the fluctuating magnetic field applying device 5 may be used.
- variable magnetic field application device 5 that generates a variable magnetic field
- the variable magnetic field can be applied by moving the magnet toward or away from the irradiation area A in the microcapillary 2 by using an actuator (not shown).
- FIG. 1 shows a case where a single-coil type coil pad 51 including one annular coil is used, the present invention is not limited to this.
- a double-coil type coil pad 51A having two annular coils 511 and 512 may be used as shown in FIG. These coils 511 and 512 are slightly inclined. Therefore, according to the double-coil type coil pad 51A, magnetic flux convergence can be improved more than the single-coil type coil pad 51, so that the magnetic flux density in the irradiation area A can be selectively concentrated.
- the digital microscope 6 includes an optical system (not shown) provided in the optical path of the scattered light S generated by the irradiation of the laser light L from minute objects contained in the sample liquid within the irradiation area A of the microcapillary 2, It is configured by combining an imaging device (not shown) or the like that receives the scattered light S incident through this optical system and converts the luminance into an electric signal to generate image data.
- An image sensor such as a CCD or a CMOS is used for the imaging device. Image data obtained by the digital microscope 6 is transmitted to the measuring device 7 .
- the measurement device 7 numerically processes the image data of minute objects obtained by the digital microscope 6 to determine the characteristics of the sample liquid (fine objects such as microbubbles and solid particles dispersed in the sample liquid).
- a computer installed with a program for measuring particle size distribution, number concentration, etc.). A specific procedure for measuring the characteristics of the test liquid with the measuring device 7 will be described later with reference to FIGS. 5 and 6.
- FIG. 5 A specific procedure for measuring the characteristics of the test liquid with the measuring device 7 will be described later with reference to FIGS. 5 and 6.
- the filter device 8 has a filter body in which countless filter holes with a predetermined inner diameter are formed.
- the inner diameter of the filter hole of the filter body is adjusted so as to allow fine particles in the test liquid to pass through and capture solid particles of large particle size in the test liquid. Therefore, by allowing the test liquid to pass through such a filter body in advance, solid particles dispersed in the test liquid having a particle size larger than the inner diameter of the filter hole can be removed.
- the filter body is positively charged so that even the negatively charged microbubbles dispersed in the sample liquid can be collected by the filter body.
- the invention is not limited to this.
- the filter body may be uncharged or may be negatively charged.
- FIG. 4 is a flow chart showing specific procedures of a measuring method for measuring properties of a test liquid using the measuring system 1 as described above.
- the operator uses a fine bubble dispersion liquid prepared in advance as a test liquid, and passes this test liquid through a positively charged filter main body.
- a fine bubble dispersion liquid prepared in advance as a test liquid, and passes this test liquid through a positively charged filter main body.
- solid particles with a large particle size and negatively charged microbubbles can be removed from the fine particles dispersed in the sample liquid.
- the microbubble dispersion used as the liquid to be tested may be prepared in advance or may be produced by a microbubble generator (not shown).
- the operator operates the fluctuating magnetic field applying device 5 to set the period of the fluctuating magnetic field to infinity to generate a static magnetic field from the coil pad 51, and bring the coil pad 51 closer to the microcapillary 2.
- a static magnetic field is applied to the test liquid in the microcapillary 2 by causing the microcapillary 2 to move.
- some of the solid particles dispersed in the sample liquid in the microcapillary 2 (in particular, paramagnetic solid particles) is moved outside the irradiation area A of the laser light L.
- a static magnetic field may be applied to the sample liquid by using a magnet prepared separately from the variable magnetic field applying device 5 .
- the amount of solid particles collected by applying a static magnetic field to the sample liquid as described above may be measured by a separate known method.
- the operator starts irradiating the laser light L with the laser device 3. More specifically, the operator operates the laser device 3 to generate a laser beam L and irradiate a predetermined irradiation area A within the microcapillary 2 with the laser beam L. As shown in FIG.
- the operator uses the variable magnetic field applying device 5 to apply a varying magnetic field for a predetermined period of time after a predetermined period of time has elapsed since the start of capturing the moving image in S5.
- the cycle of the fluctuating magnetic field is, for example, about 0.1 [sec]
- the magnetic flux density in the coil pad 51 of the fluctuating magnetic field is about 0.5 to 2.0 [T]
- the present invention is limited to this. do not have.
- the operator ends the application of the varying magnetic field by the varying magnetic field applying device 5, and then finishes capturing the moving image with the digital microscope 6 and irradiating the laser light L with the laser device 3.
- a moving image of trajectories due to Brownian motion of a plurality of fine particles dispersed in the test liquid can be obtained.
- the digital microscope 6 is used to capture moving images before and after application of a varying magnetic field, but the present invention is not limited to this. For example, a plurality of still images may be captured at such a period that traces of Brownian motion of fine particles dispersed in the sample liquid can be traced.
- the operator operates the measuring device 7 to calculate the concentration, particle size distribution, etc. of the minute matter based on the moving image data of the minute matter acquired by the digital microscope 6.
- FIG. 5 is a flow chart showing the procedure for calculating the concentration and particle size distribution of fines in the measuring device 7.
- Nano-order fine objects such as positively charged microbubbles, uncharged microbubbles, and solid particles are dispersed in the test liquid, and conventional dynamic light scattering methods and particle trajectory tracking methods However, such nano-order minute objects cannot be identified.
- the measuring device 7 distinguishes between these positively charged microbubbles, uncharged microbubbles, and solid particles, and measures the concentration and particle size distribution of each, as will be described in detail below. It is possible to calculate Below, before describing the specific procedure of the flowchart of FIG. 5, the outline of the measuring method by the measuring device 7 will be described with reference to FIG.
- FIG. 6 is a diagram showing an example of an image of minute objects obtained by detecting scattered light of laser light with the digital microscope 6.
- FIG. 6 shows an enlarged view of a part of the minute object.
- uncharged microbubbles 4a, charged microbubbles 4b, and solid particles 4c and 4d are dispersed in the sample liquid.
- Solid particles of various shapes are dispersed in the liquid to be tested, such as solid particles 4c having a shape relatively close to a true sphere and solid particles 4d having an irregular shape far from a true sphere.
- the particle size of these fine particles 4a to 4d is nano-order, which is equal to or smaller than the wavelength of the laser light, they cannot be identified only by the image obtained by detecting the scattered light.
- a variable magnetic field that fluctuates with time in a predetermined period is applied to the liquid to be tested by the variable magnetic field applying device 5
- the behavior of each minute object differs.
- solid particles 4c and 4d with biased magnetic permeability generate a rotational or translational mechanical moment under a fluctuating magnetic field and rotate.
- the relatively spherical solid particles 4c are considered to have a smaller viscosity resistance than the distorted solid particles 4d, and thus rotate faster than the distorted solid particles 4d. Therefore, when a varying magnetic field is applied while irradiating a laser beam, the brightness of light scattered by the solid particles 4c and 4d increases compared to before applying the varying magnetic field. Further, at this time, the solid particles 4d rotate faster than the solid particles 4c, so that the luminance increases more than the solid particles 4c. Moreover, it is considered that such an increase in brightness increases as the particle size of the solid particles 4c and 4d increases.
- a sphere with a mass of M [kg] and a radius of r [m] has a magnetic moment m [wb ⁇ m] and a magnetic field H [A/m] varying with time at a frequency ⁇ 0 [rad/s] is applied to the medium.
- t[s] is time
- ⁇ [rad] is the angle between the magnetic moment m and the magnetic field H.
- the microbubbles 4a which are not charged, have almost no magnetic permeability and their own weight is very small compared to solid particles. It hardly rotates even when a magnetic field is applied. Therefore, even if a varying magnetic field is applied while irradiating a laser beam, the brightness of the light scattered by the uncharged microbubbles 4a hardly increases. Also, the charged microbubbles 4b disappear when a varying magnetic field is applied. Therefore, when a varying magnetic field is applied while irradiating a laser beam, the brightness of the light scattered by the charged microbubbles 4b becomes zero.
- the measurement device 7 identifies each of the microscopic objects 4a to 4d by utilizing the fact that the microscopic objects 4a to 4d behave differently under the varying magnetic field.
- the measuring device 7 detects a plurality of minute particles contained in the moving image based on the moving image of the trajectory of the minute object due to the Brownian motion before and after the application of the varying magnetic field. Objects are distinguished into uncharged microbubbles, charged microbubbles and solid particles.
- the measuring device 7 identifies, as solid particles, microscopic objects whose brightness has increased by a predetermined threshold value or more when a varying magnetic field is applied in the moving image, disappears when a varying magnetic field is applied, A microscopic object whose luminance becomes 0 is identified as a charged microbubble, and a microscopic object whose luminance does not rise above a predetermined threshold when a varying magnetic field is applied is identified as an uncharged microbubble.
- the measuring device 7 stops the subsequent calculations and After changing the wavelength of light, the process shown in FIG. 4 is preferably performed again.
- the measuring device 7 determines the number of uncharged microbubbles, charged microbubbles, and solid particles identified in S11 in the moving image of the trajectory of the microscopic object due to Brownian motion before applying the varying magnetic field. are calculated to calculate the number concentration Cb0 of uncharged microbubbles, the number concentration Cbc of charged microbubbles, and the number concentration Csolid of solid particles in the sample liquid.
- the measuring device 7 analyzes the trajectory of the microscopic object due to Brownian motion based on the moving image of the trajectory of the microscopic object due to Brownian motion before the application of the varying magnetic field, thereby obtaining each counted in S12.
- the particle size of fine matter is calculated separately for uncharged microbubbles, charged microbubbles, and solid particles. More specifically, the speed of Brownian motion of the fine particles dispersed in the test liquid decreases as the particle size of the fine particles increases, and increases as the particle size of the fine particles decreases.
- the grain size of each fine particle can be calculated by analyzing the trace of the Brownian motion of the fine particle.
- the measurement device 7 divides into non-charged microbubbles, charged microbubbles, and solid particles, and uses the information on the particle size of each microparticle calculated in S13 to determine the A particle size distribution Db0 of uncharged microbubbles dispersed in a liquid, a particle size distribution Dbc of charged microbubbles, and a particle size distribution Dsolid of solid particles are calculated.
- FIG. 7 is a diagram schematically showing the configuration of part of the measurement system 1A according to this embodiment.
- the measurement system 1A further includes an electrophoresis device 9 in addition to the measurement system 1 according to the first embodiment.
- illustration of the fluctuating magnetic field applying device 5 and the measuring device 7 in the measuring system 1A is omitted.
- illustrations and detailed descriptions of the same configurations as those of the measurement system 1 according to the first embodiment are omitted.
- the electrophoresis apparatus 9 includes a holder 91 that horizontally holds the microcapillary 2, a pair of electrode support parts 92 and 93 provided on both end sides of the microcapillary 2, and a DC power supply (not shown).
- the holder 91 has a columnar shape.
- An upper surface 911 of the holder 91 is formed with an arc-shaped support groove 912 extending along the extending direction of the microcapillary 2 when viewed in cross section.
- the microcapillary 2 is provided along the support groove 912 .
- a notch 913 having a circular shape in plan view is formed in the approximate center of the holder 91, that is, in the vicinity of the irradiation area A of the laser beam L. As shown in FIG.
- Needle-shaped electrodes 92a and 93a are provided on the surfaces of the electrode supporting portions 92 and 93 facing the microcapillary 2, respectively. These electrodes 92a and 93a are connected to the positive and negative poles of a DC power supply, respectively. Moreover, these electrode support parts 92 and 93 can be moved closer to each other or separated from each other along the extending direction of the microcapillary 2 . When the electrode support parts 92 and 93 are brought close to each other, the respective electrodes 92a and 93a are inserted into both ends of the channel 2a of the microcapillary 2. As shown in FIG.
- FIG. 8 is a flowchart showing specific procedures of a measurement method for measuring properties of a test liquid using the measurement system 1A according to this embodiment.
- the procedures of S11-S12, S14-S16, and S18-S19 are the same as the procedures of S1-S8 in the flowchart of FIG. 4, respectively, so detailed description thereof will be omitted.
- the operator After holding the sample liquid in the microcapillary 2 in S12, in S13, the operator brings the electrode support parts 92 and 93 closer to each other, thereby inserting the electrodes 92a and 93a into both ends of the channel 2a of the microcapillary 2. do.
- the operator turns on the power supply connected to the electrodes 92a and 93a for a predetermined period of time so that the electrodes 92a and 93a An electric field is applied to the sample liquid in the irradiation area A between them for a predetermined time.
- the operator After capturing the moving image with the digital microscope 6 and irradiating the laser light L with the laser device 3 in S19, the operator operates the measuring device 7 in S20 to measure the minute object acquired by the digital microscope 6. Based on the moving image data, the concentration and particle size distribution of fine particles are calculated.
- the measuring method by applying an electric field for a predetermined period of time in S17, a moving image at the time of application of an electric field, which is a moving image of the trajectory of microscopic objects caused by electrophoresis while the electric field is being applied, is generated. is obtained. Therefore, in S20, along with discriminating the fine matter into solid particles and microbubbles, based on this moving image when the electric field is applied, by analyzing the migration speed of the solid particles contained in the test liquid, etc., these solid particles Measure the electrical characteristics.
- FIG. 9 is a diagram schematically showing the configuration of part of the measurement system 1B according to this embodiment.
- the measurement system 1B further includes an electrophoresis device 9B in addition to the measurement system 1 according to the first embodiment.
- illustration of the variable magnetic field applying device 5 and the measuring device 7 in the measuring system 1B is omitted.
- illustrations and detailed descriptions of the same configurations as those of the measurement system 1 according to the first embodiment are omitted.
- the electrophoresis apparatus 9B includes a pair of electrode support caps 95 and 96 provided on both end sides of the microcapillary 2, a stand (not shown) for holding the microcapillary 2 vertically, a power supply (not shown), Prepare.
- Needle-shaped electrodes 95a and 96a are provided inside the electrode support caps 95 and 96, respectively. Therefore, when the electrode support caps 95 and 96 are fitted to both ends of the microcapillary 2, the electrodes 95a and 96a are inserted into both ends of the channel 2a of the microcapillary 2, respectively.
- the microscopic objects are classified into uncharged microbubbles, charged microbubbles, and solid particles (see FIG. 5).
- S11 the particle size of each fine particle was calculated by analyzing the trajectory of Brownian motion before the application of the varying magnetic field (see S13 in FIG. 5).
- the method of calculating is not limited to this.
- the number of rotations of solid particles when a varying magnetic field is applied is correlated with the magnitude of change in the brightness of scattered light. Further, the number of rotations of solid particles when a varying magnetic field is applied is also correlated with the particle size of solid particles, the viscosity of a medium, and the like. Therefore, by utilizing the correlation between the magnitude of change in luminance of scattered light, the grain size of solid particles, and the viscosity of a medium, the grain size of solid particles is calculated based on the magnitude of change in luminance of scattered light. It is possible.
- pre-testing is performed to measure the correlation between the magnitude of change in brightness of scattered light and the particle size of solid particles before and after application of a varying magnetic field under various media with different viscosity coefficients.
- a particle size calculation map of solid particles as shown in FIG. 10 is prepared.
- the measurement device 7 also calculates the magnitude of change in brightness of the scattered light caused by the fine matter identified as the solid particle based on the moving image of the trajectory of the fine matter before and after the application of the varying magnetic field. and the viscosity coefficient of the medium input by the operator, the particle size of the solid particles may be calculated by searching a solid particle size calculation map shown in FIG.
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Abstract
Description
が好ましい。
きる。
以下、本発明の第1実施形態に係る微細気泡分散液の測定方法が適用された測定システム1の構成について、図面を参照しながら詳細に説明する。
次に、本発明の第2実施形態に係る微細気泡分散液の測定方法が適用された測定システム1Aの構成について、図面を参照しながら詳細に説明する。
次に、本発明の第2実施形態に係る微細気泡分散液の測定方法が適用された測定システム1Bの構成について、図面を参照しながら詳細に説明する。
2…マイクロキャピラリー(保持装置)
3…レーザー装置(光源)
4a…帯電していない微細気泡
4b…帯電した微細気泡
4c,4d…固体粒子
5…変動磁場印加装置
51,51A…コイルパッド
52…本体
6…デジタルマイクロスコープ(光検出装置)
7…測定装置
L…レーザー光
S…散乱光
A…照射エリア
Claims (15)
- 微細気泡分散液である被検液の特性を測定する微細気泡分散液の測定方法であって、
保持装置によって保持される被検液に対し照明光を照射する照射工程と、
前記照明光の照射エリア内の被検液に対し時間変動する変動磁場を印加する変動磁場印加工程と、
前記照明光の照射によって、被検液に含まれる微細物から生じる散乱光を光検出装置によって検出する散乱光検出工程と、を備え、
前記光検出装置によって検出された散乱光の輝度に基づいて微細物を微細気泡と固体粒子とに識別することを特徴とする微細気泡分散液の測定方法。 - 被検液は2[nm]以上2000[nm]未満の範囲内の粒径の微細気泡を含むことを特徴とする請求項1に記載の微細気泡分散液の測定方法。
- 前記光検出装置によって取得された微細物の画像において、輝度を所定の閾値と比較することによって微細物を固体粒子と微細気泡とに識別することを特徴とする請求項1又は2に記載の微細気泡分散液の測定方法。
- 前記散乱光検出工程では、前記変動磁場を印加する前後にわたり前記光検出装置で散乱光を検出することにより、ブラウン運動による微細物の軌跡の画像を取得し、
前記光検出装置によって取得された画像において、前記変動磁場を印加したときにおける輝度の上昇の有無に基づいて微細物を固体粒子と微細気泡とに識別することを特徴とする請求項1又は2に記載の微細気泡分散液の測定方法。 - 前記光検出装置によって取得された画像において、前記変動磁場を印加したときに輝度が上昇した微細物を固体粒子として特定し、前記変動磁場を印加したときに消滅した微細物を帯電性の微細気泡として特定し、前記変動磁場を印加したときに輝度が上昇しなかった微細物を非帯電性の微細気泡として特定することを特徴とする請求項4に記載の微細気泡分散液の測定方法。
- 前記光検出装置によって取得された画像に基づいて、被検液に含まれる固体粒子の濃度及び粒径分布の少なくとも何れかを算出する固体粒子測定工程をさらに備えることを特徴とする請求項1から5の何れかに記載の微細気泡分散液の測定方法。
- 前記光検出装置によって取得された画像に基づいて、被検液に含まれる非帯電性の微細気泡の濃度及び粒径分布の少なくとも何れかを算出する非帯電性微細気泡測定工程をさらに備えることを特徴とする請求項1から6の何れかに記載の微細気泡分散液の測定方法。
- 前記散乱光検出工程では、前記変動磁場を印加する前におけるブラウン運動による微細物の軌跡の画像である印加前画像と、前記変動磁場を印加している間におけるブラウン運動による微細物の軌跡の画像である印加中画像と、を取得し、
前記印加前画像及び前記印加中画像に基づいて、被検液に含まれる帯電性の微細気泡の濃度及び粒径分布の少なくとも何れかを算出する帯電性微細気泡測定工程をさらに備えることを特徴とする請求項4から7の何れかに記載の微細気泡分散液の測定方法。 - 前記保持装置によって被検液を保持させる前に、被検液をプラスに帯電したフィルタを通過させる第1スクリーニング工程をさらに備えることを特徴とする請求項8に記載の微細気泡分散液の測定方法。
- 前記光検出装置によって取得された微細物の画像において、前記変動磁場を印加したときにおける輝度変化の大きさに基づいて固体粒子の粒径を算出することを特徴とする請求項1から9の何れかに記載の微細気泡分散液の測定方法。
- 前記照明光の照射エリア内の被検液に対し電場を印加する電場印加工程をさらに備え、 前記散乱光検出工程では、前記電場を印加している間における電気泳動による微細物の軌跡の画像である電場印加時画像を取得し、
前記電場印加時画像に基づいて、被検液に含まれる固体粒子の物性を測定することを特徴とする請求項1から10の何れかに記載の微細気泡分散液の測定方法。 - 被検液に対し前記変動磁場を印加する前に静磁場を印加することにより、被検液中の固体粒子の少なくとも一部を前記照射エリアの外へ移動させる第2スクリーニング工程をさらに備えることを特徴とする請求項1から11の何れかに記載の微細気泡分散液の測定方法。
- 前記第2スクリーニング工程において前記静磁場を印加することによって捕集した常磁性の固体粒子の量を測定する常磁性物質量測定工程をさらに備えることを特徴とする請求項12に記載の微細気泡分散液の測定方法。
- 前記照明光の光源は、レーザー装置であり、
当該レーザー装置は、レーザー光の波長を300[nm]以上700[nm]未満の範囲内に定められた複数の値で切替可能であることを特徴とする請求項1から13の何れかに記載の微細気泡分散液の測定方法。 - 微細気泡分散液である被検液の特性を測定する微細気泡分散液の測定システムであって、
被検液を保持する保持装置と、
前記保持装置によって保持される被検液に対し照明光を照射する光源と、
前記照明光の照射エリア内の被検液に対し時間変動する変動磁場を印加する変動磁場印加装置と、
前記照明光の照射によって、被検液に含まれる微細物から生じる散乱光を検出する光検出装置と、
前記光検出装置により検出された散乱光の輝度に基づいて微細物を微細気泡と固体粒子とに識別することによって、被検液の特性を測定する測定装置と、を備えることを特徴とする微細気泡分散液の測定システム。
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