CN114371124B - Drop adhesive force detecting system based on micro-cantilever beam - Google Patents
Drop adhesive force detecting system based on micro-cantilever beam Download PDFInfo
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- CN114371124B CN114371124B CN202210040004.7A CN202210040004A CN114371124B CN 114371124 B CN114371124 B CN 114371124B CN 202210040004 A CN202210040004 A CN 202210040004A CN 114371124 B CN114371124 B CN 114371124B
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- 239000000853 adhesive Substances 0.000 title claims abstract description 15
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 67
- 238000001514 detection method Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 10
- 230000035945 sensitivity Effects 0.000 claims description 8
- 238000003795 desorption Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 239000000758 substrate Substances 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The invention relates to a micro-cantilever-based drop adhesive force detection system, which specifically comprises a laser, a micro cantilever clamping table, a micro drop injector, an injector bracket, a photoelectric detector, a micro camera, a camera bracket, a data acquisition card, a computer and the like, wherein the front end of the micro cantilever is forwards hung to be a free end, the bottom of the micro injector is a hydrophilic liquid hole of the injector, and the micro injector longitudinally moves under the clamping of the injector bracket so as to be used for controlling drops to move up and down on the surface of the micro cantilever.
Description
Technical Field
The invention relates to drop adhesion detection, in particular to a solid-liquid interface drop adhesion detection system.
Background
The adhesion between solid and liquid interfaces is a key factor influencing the dynamic performance of the liquid phase on the solid surface, and the detection of the interface adhesion is widely focused in theoretical research and practical application, and is a key breakthrough point of the lyophobic surface towards practical application. The traditional measurement of the adhesive force of the liquid drops is to blow off the liquid drops on the substrate by utilizing air flows with different intensities, so that the minimum air flow intensity capable of blowing off the liquid drops is obtained, and the adhesive force of the liquid drops is obtained through calculation; during this measurement, part of the gas flow first changes direction after reaching the substrate and then acts on the droplets, thus interfering with the measurement.
In the patent document with publication number CN211825620, a device for measuring adhesive force of liquid drop is disclosed, which is to place a substrate to be measured and a measuring component on the table surface of a workbench, the measuring component has an adsorption surface and the adsorption surface faces to the substrate, the measuring component can move relative to the substrate, and is used for adsorbing the liquid drop on the substrate at different angles and/or distances and reading the adsorption force born by the measuring component; however, in the detection mode, the magnet is used for controlling the sliding block to drive the measuring assembly, so that the sensitivity of the large-scale substrate for adsorbing the liquid drops can not meet the requirement, and the detection precision is greatly limited.
Disclosure of Invention
The invention aims to avoid the defects of the prior art, and provides a droplet adhesion detection system based on a micro-cantilever beam, so as to realize high-sensitivity detection of droplet adhesion.
The invention relates to a droplet adhesion detection system based on a micro-cantilever beam, which is characterized by comprising the following components: the liquid drop adhesive force detection system based on the micro cantilever beam is characterized by comprising:
the tail part of the micro cantilever is clamped by a micro beam clamping table, and the front end of the micro cantilever horizontally extends to be a free end;
a laser emitting laser beam along 45 degrees with the micro-cantilever 。 The direction of the angle irradiates the free end of the micro-cantilever from bottom to top, and generates a reflected light beam at the free end of the micro-cantilever;
the micro-sampler is arranged above the free end of the micro-cantilever by utilizing a sampler support, the sampler support can drive the micro-sampler to vertically move up and down, the bottom of the micro-sampler is provided with a syringe liquid hole, and sample liquid stored in the micro-sampler can be pushed into the syringe liquid hole by the syringe and kept as liquid drops to be hung on the syringe liquid hole;
the micro camera is fixedly supported above the micro cantilever by a camera bracket and is used for shooting and obtaining images of the adhesion-desorption process of the liquid drops and the micro cantilever;
the photoelectric detector is arranged in the reflection loop of the reflected light and is used for receiving the reflected light, and the data acquisition card transmits the acquired output signal of the photoelectric detector to the computer for signal processing, so that the detection of the adhesive force of the liquid drops is realized.
The liquid drop in the liquid hole of the microsyringe is not contacted with the micro beam in the initial state, and the light spot of the laser beam emitted by the laser after being reflected by the micro cantilever beam coincides with the center position of the detector;
firstly, controlling a sample injector bracket to enable a microsyringe to move downwards until liquid drops suspended in a liquid hole of the syringe are contacted with the upper surface of the free end of a micro-cantilever, and enabling the micro-cantilever to deviate downwards and the light spot position to change;
adjusting the sample injector bracket again, dragging the liquid drop upwards to enable the micro beam to be restored to a parallel state, and enabling the light spot to coincide with the center of the detector again;
finally, controlling the sample injector bracket to enable the microsyringe to move upwards, and enabling the liquid drop to drive the free end of the micro-cantilever to generate upward deflection until the liquid drop is separated from the surface of the micro-cantilever; and the data acquisition card is used for acquiring the offset of the micro beam in the process of upward movement of the liquid drop.
The photoelectric detector is a four-quadrant detector, and the photosensitive target surface of the photoelectric detector is a circular surface taking an O point as a center point and taking R as a radius; the light spot is represented by O' (x) 0 ,y 0 ) A circular surface with r as a radius and a center point;
i is as follows A 、I B 、I C And I D The current intensities of the first quadrant, the second quadrant, the third quadrant and the fourth quadrant, which are obtained by detection of the photoelectric detector, are represented in a one-to-one correspondence manner;
when the position of the light spot on the photoelectric detector is changed, the output current intensity of each quadrant of the detector is changed, the relative offset of the light spot on the photosensitive surface is calculated according to the light current change generated by the light spot by the following formula (1), and the bending deflection delta Z of the micro-cantilever is calculated according to the formula (2):
wherein:
K x the detection sensitivity of the detector in the X-axis direction is obtained;
K y the detection sensitivity of the detector in the Y-axis direction is as follows;
Δs is the linear offset of the spot center point relative to the photosensitive target surface O;
l is the distance from the contact center point of the liquid drop and the micro-cantilever to the fixed end of the micro-cantilever;
l is the distance from the free end of the micro-cantilever to the photosensitive target surface of the photoelectric detector after the laser beam is reflected by the micro-cantilever; then, the droplet adhesion force F is: f=kΔz
Where k is the spring constant of the micro-cantilever.
The invention discloses a droplet adhesion detection system based on a micro-cantilever beam, which is also characterized in that: the injector liquid hole of the microsyringe (4) is flat head, and hydrophilic treatment is carried out to enhance the adhesive force between the liquid drop and the liquid hole.
The invention discloses a droplet adhesion detection system based on a micro-cantilever beam, which is also characterized in that: the capacity of the microsyringe is 10 mu L, and the diameter of the liquid hole of the syringe is 0.05mm; the laser is a semiconductor laser with the output laser wavelength of 632nm-780 nm.
The invention discloses a droplet adhesion detection system based on a micro-cantilever beam, which is also characterized in that: the photodetector (6) is a position sensitive sensor PSD.
The invention discloses a droplet adhesion detection system based on a micro-cantilever beam, which is also characterized in that: the micro-cantilever beam is a rectangular single beam, the length of the beam is 500 mu m, the width of the beam is 9 mu m, and the thickness of the beam is 1 mu m.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the free end of the micro-cantilever beam is irradiated by laser, so that the accurate detection of the surface stress change process on the micro-nano scale can be realized, the adhesive force of the liquid drop on the solid surface can be accurately detected, the adhesive force between the liquid drop and the substrate can be obtained more simply and reliably, the response speed is higher, and the sensitivity is higher;
2. the invention has simple light path structure and easy construction, and obtains the dynamic desorption curve of the liquid drop on the solid surface more intuitively and vividly by processing the information of the computer and displaying the measurement result;
3. aiming at the specific application of the invention, the micro-cantilever beam is amplified and displayed by utilizing the micro-camera, the surface of the micro-cantilever beam can be modified, the association between different microstructures on the solid surface and the adhesive force of surface liquid drops can be easily obtained, and the guiding direction is provided for constructing, regulating and controlling the lyophobic surface.
Drawings
FIG. 1 is a schematic diagram of a detection system according to the present invention;
FIG. 2 is a schematic diagram of a microcantilever Liang Pianzhuai in the detection system of the present invention;
FIG. 3 is a schematic process diagram of the photoelectric detection principle in the detection system of the invention;
FIG. 4 is a visual display of Lab VIEW data on an operating page in the detection system of the present invention;
FIG. 5 is a graph showing the desorption of a droplet from a micro-cantilever surface in a detection system of the present invention;
reference numerals in the drawings: the micro-cantilever type optical fiber laser comprises a laser device 1, a micro-cantilever beam 2, a micro-beam clamping table 3, a micro-sampler 4, a sampler support 5, a photoelectric detector 6, a micro-camera 7, a camera support 8, a data acquisition card 9 and a computer 10.
Detailed Description
The present invention is described in detail below with reference to the attached drawings for the understanding of the skilled person.
Example 1
The micro-cantilever-based droplet adhesion detection system as shown in fig. 1 is characterized by comprising:
the tail part of the micro cantilever beam (2) is clamped by a micro beam clamping table (3), and the front end of the micro cantilever beam horizontally extends to be a free end;
a laser (1) for emitting a laser beam along a direction 45 to the micro-cantilever (2) 。 The direction of the angle irradiates the micro-scale from bottom to topThe free end of the cantilever beam and generating a reflected light beam at the free end of the micro-cantilever beam (2);
the micro-injector (4) is arranged above the free end of the micro-cantilever (2) by using an injector bracket (5), the injector bracket (5) can drive the micro-injector (4) to vertically move up and down, the bottom of the micro-injector (4) is provided with an injector liquid hole, and sample liquid stored in the micro-injector (4) can be pushed into the injector liquid hole by the injector and kept as liquid drops to be hung on the injector liquid hole;
the micro camera (7) is fixedly supported above the micro cantilever (2) by a camera bracket (8) and is used for shooting and obtaining images of the adhesion-desorption process of the liquid drops and the micro cantilever;
the photoelectric detector (6) is arranged in the reflection loop of the reflected light and is used for receiving the reflected light, and the data acquisition card (9) transmits the acquired output signal of the photoelectric detector (6) to the computer (10) for signal processing, so that the detection of the adhesive force of the liquid drops is realized.
The liquid drop in the liquid hole of the microsyringe (4) is not contacted with the micro beam (2) in the initial state, and the light spot of the laser beam emitted by the laser (1) reflected by the micro cantilever is overlapped with the center position of the detector (6);
firstly, controlling a sample injector bracket (5) to enable a microsyringe (4) to move downwards until liquid drops suspended in a liquid hole of the syringe are contacted with the upper surface of the free end of a micro-cantilever, and enabling the micro-cantilever to deviate downwards and the light spot position to change;
adjusting the sample injector bracket (5) again, dragging the liquid drop upwards to enable the micro beam to recover to a parallel state, and enabling the light spot to coincide with the center of the detector again;
finally, controlling the sample injector bracket (5) to enable the microsyringe (4) to move upwards, and enabling the liquid drop to drive the free end of the micro-cantilever to generate upward deflection until the liquid drop is separated from the surface of the micro-cantilever; and the data acquisition card (9) is used for acquiring the offset of the micro beam in the process of upward movement of the liquid drop.
The photoelectric detector (6) is a four-quadrant detector, and the photosensitive target surface of the photoelectric detector (6) is a circular surface taking an O point as a center point and taking R as a radius; the light spot is represented by O' (x) 0 ,y 0 ) A circular surface with r as a radius and a center point;
i is as follows A 、I B 、I C And I D The current intensity of the first quadrant, the second quadrant, the third quadrant and the fourth quadrant, which are obtained by detection of the photoelectric detector (6), are represented in a one-to-one correspondence manner;
when the position of the light spot on the photoelectric detector is changed, the output current intensity of each quadrant of the detector is changed, the relative offset of the light spot on the photosensitive surface is calculated according to the light current change generated by the light spot by the following formula (1), and the bending deflection delta Z of the micro-cantilever is calculated according to the formula (2):
K x the detection sensitivity of the detector in the X-axis direction is obtained;
K y the detection sensitivity of the detector in the Y-axis direction is as follows;
Δs is the linear offset of the spot center point relative to the photosensitive target surface O;
l is the distance from the contact center point of the liquid drop and the micro-cantilever to the fixed end of the micro-cantilever;
l is the distance from the free end of the micro-cantilever to the photosensitive target surface of the photoelectric detector after the laser beam is reflected by the micro-cantilever; then, the droplet adhesion force F is: f=kΔz
Where k is the spring constant of the micro-cantilever.
Example 2
The application steps of the droplet adhesion detection system based on the micro-cantilever beam are as follows:
slowly extruding 0.4 mu L of water drop by utilizing a microsyringe (4), keeping the water drop not to drop on a needle head of the microsyringe (4), enabling a light-sensing target surface of a photoelectric detector (6) to be 3.7cm away from the free end of the micro-cantilever (2), finely adjusting a sample holder (5), enabling the water drop to be in full contact with the surface of the micro-cantilever (2) without damaging the surface tension of the water drop after the water drop is in contact with the surface of the micro-cantilever (2), enabling the distance from the center point of the contact of the water drop with the micro-cantilever (2) to be 450 mu m away from the fixed end of the micro-cantilever (2), reversely finely adjusting the sample holder (5), enabling the needle head of the microsyringe (4) to drive the water drop to slowly to be separated from the surface of the micro-cantilever (2), displaying deflection displacement of the micro-cantilever (2) on a LabVIEW program of a data acquisition card (9) at the end of a computer (10), and obtaining a curve of the desorption of the water drop on the surface of the micro-cantilever (2) by calculating when the bending degree of the micro-cantilever (2) is separated from the surface of the micro-cantilever (2) reaches a threshold value.
The present invention has been described in terms of specific embodiments, but these should not be construed as limitations of the present invention, and various changes and modifications can be made by one skilled in the art without departing from the spirit of the invention, which is intended to be within the scope of the invention as defined in the appended claims.
Claims (1)
1. A micro-cantilever based droplet adhesion detection system, the micro-cantilever based droplet adhesion detection system comprising:
the tail part of the micro cantilever is clamped by a micro beam clamping table, and the front end of the micro cantilever horizontally extends to be a free end;
the laser irradiates the free end of the micro-cantilever from bottom to top along the direction forming an angle of 45 degrees with the micro-cantilever, and generates a reflected beam at the free end of the micro-cantilever;
the micro-sampler is arranged above the free end of the micro-cantilever by utilizing a sampler support, the sampler support can drive the micro-sampler to vertically move up and down, the bottom of the micro-sampler is provided with a syringe liquid hole, and sample liquid stored in the micro-sampler can be pushed into the syringe liquid hole by the syringe and kept as liquid drops to be hung on the syringe liquid hole;
the micro camera is fixedly supported above the micro cantilever by a camera bracket and is used for shooting and obtaining images of the adhesion-desorption process of the liquid drops and the micro cantilever;
the photoelectric detector is arranged in the reflection loop of the reflected light and is used for receiving the reflected light, and the data acquisition card transmits the acquired output signal of the photoelectric detector to the computer for signal processing to realize detection of the adhesive force of the liquid drops;
the liquid drop in the liquid hole of the microsyringe is not contacted with the micro beam in the initial state, and the light spot of the laser beam emitted by the laser after being reflected by the micro cantilever beam coincides with the center position of the detector;
firstly, controlling a sample injector bracket to enable a microsyringe to move downwards until liquid drops suspended in a liquid hole of the syringe are contacted with the upper surface of the free end of a micro-cantilever, and the micro-cantilever deflects downwards to change the light spot position;
thirdly, adjusting the sample injector bracket, dragging the liquid drop upwards to enable the micro beam to be restored to a parallel state, and enabling the light spot to coincide with the center of the detector again;
finally, controlling the sample injector bracket to enable the microsyringe to move upwards, and enabling the liquid drop to drive the free end of the micro-cantilever to generate upward offset until the liquid drop is separated from the surface of the micro-cantilever; the method comprises the steps that a data acquisition card is used for acquiring the offset of a micro beam in the process of upward movement of liquid drops;
the photoelectric detector is a four-quadrant detector, and the photosensitive target surface of the photoelectric detector is a circular surface taking an O point as a center point and taking R as a radius; the light spot is represented by O' (x) 0 ,y 0 ) A circular surface with r as a radius and a center point;
i is as follows A 、I B 、I C And I D The current intensities of the first quadrant, the second quadrant, the third quadrant and the fourth quadrant, which are obtained by detection of the photoelectric detector, are represented in a one-to-one correspondence manner;
when the position of the light spot on the photoelectric detector is changed, the output current intensity of each quadrant of the detector is changed, the relative offset of the light spot on the photosensitive surface is obtained by calculating according to the light current change generated by the light spot by the following formula (1), and the bending deflection delta Z of the micro-cantilever is obtained by calculating according to the formula:
wherein:
kx is the detection sensitivity of the detector in the X-axis direction;
ky is the detection sensitivity of the detector in the Y-axis direction;
Δs is the linear offset of the spot center point relative to the photosensitive target surface;
l is the distance from the contact center point of the liquid drop and the micro-cantilever to the fixed end of the micro-cantilever;
l is the distance from the free end of the micro-cantilever to the photosensitive target surface of the photoelectric detector after the laser beam is reflected by the micro-cantilever;
the drop adhesion force F is: f=kΔz
Wherein k is the spring constant of the micro-cantilever;
the method is characterized by comprising the following steps of:
the micro-sampler is utilized to slowly extrude 0.4 mu L of water drop, the water drop is kept not to drop on a needle head of the micro-sampler, the distance from a photosensitive target surface of a photoelectric detector to the free end of a micro-cantilever is 3.7cm, a sample-sampler support is finely adjusted, after the water drop contacts with the surface of the micro-cantilever, the water drop moves downwards by 20 mu m, so that the water drop fully contacts with the surface of the micro-cantilever, the surface tension of the water drop is not destroyed, the distance from the center point of the water drop contacted with the micro-cantilever to the fixed end of the micro-cantilever is 450 mu m, the sample-sampler support is reversely finely adjusted, the needle head of the micro-sampler drives the water drop to slowly separate from the surface of the micro-cantilever, the deflection displacement of the micro-cantilever is displayed on a Lab VIEW program of a computer end in real time through a data acquisition card, and when the water drop is separated from the surface of the micro-cantilever, the bending degree of the micro-cantilever reaches a threshold value, the adhesive force of the water drop on the surface of the micro-cantilever is calculated through a formula, and a mechanical curve of the desorption of the water drop on the surface of the micro-cantilever is obtained.
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