CN111239004A - Test device and method for measuring liquid-solid interface action state of transparent fixed sample - Google Patents
Test device and method for measuring liquid-solid interface action state of transparent fixed sample Download PDFInfo
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- G—PHYSICS
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- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- G—PHYSICS
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N13/02—Investigating surface tension of liquids
- G01N2013/0216—Investigating surface tension of liquids by measuring skin friction or shear force
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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Abstract
The invention discloses a test device and a method for measuring the action state of a liquid-solid interface of a transparent fixed sample, wherein the test device comprises a base, an image capturing system, a sample table, a sample injection system, a force measurement sensing system and an image processing terminal, wherein the image capturing system, the sample table, the sample injection system, the force measurement sensing system and the image processing terminal are arranged on the base; the sample injection system comprises a sample injection support, a needle tube and an injector, wherein the needle tube and the injector are installed on the sample injection support, the lower end of the needle tube is positioned right above the sample platform, the force measurement sensing system is used for measuring the deflection force of the lower end of the needle tube along the main motion direction and the pulling force of the lower end of the needle tube along the vertical direction, and the image capturing system is used for capturing the side view and the bottom view of the solid-liquid. The invention can simultaneously measure the solid-liquid contact acting force and the contact area, and can visually and conveniently represent the liquid-solid interaction so as to explore the interaction rule of the liquid-solid interface and the like.
Description
Technical Field
The invention belongs to the technical field of solid-liquid interface measurement, relates to a contact measurement device, and particularly relates to a test device and a method for measuring the action state of a liquid-solid interface of a transparent fixed sample.
Background
The basic indexes of solid-liquid contact angle, liquid-liquid interfacial tension, liquid-gas surface tension value and the like are basic parameters for measuring the wettability of liquid to the surface of a solid material. The contact angle refers to an angle formed when a small droplet of liquid is dropped on a horizontal plane of a solid, and a liquid phase is sandwiched between two tangent lines of a gas-liquid interface and a solid-liquid interface at a solid-liquid-gas three-phase boundary point on the surface of the solid. The contact angle value is an index determined by combining various factors such as inherent properties of the material, chemical isomerism, surface physical structure, surface cleanliness and the like. Experiments show that the solid-liquid contact area is related to solid-liquid friction and adhesion. Because the traditional contact angle measuring instrument can only measure the wettability of liquid on the surface of a solid material, the solid-liquid friction force, the adhesion force and the change of the solid-liquid contact area in the solid-liquid friction process in the test process cannot be accurately measured, and the related relation between the contact angle, the solid-liquid friction force, the solid-liquid contact area and the material characteristics cannot be monitored and compared in real time.
Disclosure of Invention
The invention aims to solve the problems that: a measuring device for synchronously measuring the interaction between liquid and solid interfaces and the contact area between liquid and solid provides a test method for directly researching the synchronism of the contact friction force, the adhesion force and the dynamic contact area between liquid and solid, so as to develop a new research direction of the interaction between liquid and solid.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a test device for measuring the action state of a liquid-solid interface of a transparent fixed sample is characterized in that; the device comprises a base, an image capturing system, a sample stage, a sample injection system, a force measurement sensing system and an image processing terminal, wherein the image capturing system, the sample stage, the sample injection system, the force measurement sensing system and the image processing terminal are arranged on the base; the sample injection system comprises a sample injection support, a needle tube and an injector which are arranged on the sample injection support, the sample introduction support is arranged on the base through a lifting device, the top of the needle tube is connected with the injector through a hose, the lower end of the needle tube is positioned right above the sample platform, the force measuring and sensing system is used for measuring the deflection force of the lower end of the needle tube along the main movement direction and the pull force in the vertical direction, the image capturing system comprises a 45-degree inclined reflector, a background light source and two parallel shooting modules, the 45-degree reflector is arranged between the transparent top plate and the sample bottom plate of the sample table, the shooting modules and the background light source are respectively arranged on the bases at the two sides of the sample table, the shooting directions of the two shooting modules are vertical to the main motion direction, the shooting module positioned at the upper part is used for shooting a solid-liquid contact surface, and the shooting module positioned at the lower part is used for measuring the solid-liquid contact area after being reflected by the 45-degree reflector.
Furthermore, the middle part or the upper part of the needle tube is arranged on the sample injection support through a rotating shaft, and the force measuring and sensing system comprises a torsion sensor and a tension sensor which are arranged at the rotating shaft.
Further, the background light source is a flat light source, and specifically, an LED parallel light source with an adjustable bright point is adopted.
Furthermore, the three-dimensional moving platform is formed by combining translation mechanisms in X, Y and Z directions, wherein the Y direction is a main motion direction, and the Z direction is a vertical lifting direction.
Furthermore, the three-dimensional moving platform consists of an X-direction optical translation frame, a Y-direction optical translation frame, a Z-direction optical translation frame and corresponding adjusting motors, and the translation frames can be adjusted and controlled by rotating screw rods. By adopting the technical scheme, the sample stage can perform uniform or variable speed motion at an adjustable speed along X, Y, Z three directions under the control of a motor or a manual knob.
Further, the XYZ three-way movement speed of the three-dimensional moving platform is 0.01-20 mm per second.
Furthermore, the tail end of the needle tube is provided with an expansion section for increasing the bonding force with the liquid drops.
Furthermore, the size of the liquid drop of the needle tube in single injection is 0.1 microliter-50 microliter.
Furthermore, the shooting module is a CCD unit, and images and videos captured by the two CCD units are processed by the image processing terminal.
By adopting the technical scheme, clear panorama of side imaging and solid-liquid contact area imaging is ensured.
A method for measuring liquid-solid contact normal adhesion force and contact area by using the testing device is characterized by comprising the following steps:
the method comprises the following steps: placing a solid sample to be tested on a transparent top plate of a sample table, and dripping liquid drops with known types and volumes to the surface of the solid sample through a needle tube of an injection system by a sample injection system;
step two: inserting a needle tube into the middle position inside the liquid drop, starting a lifting device, controlling the needle tube to slowly rise at a constant speed through the lifting device, simultaneously starting two shooting modules, shooting the relative motion of the liquid drop and the solid sample by the upper shooting module, and shooting an interface image of the contact between the liquid drop and the solid sample by the lower shooting module until the liquid drop is separated from the surface of the sample or the liquid drop is separated from the needle tube;
step three: the magnitude of the liquid-solid contact normal adhesion force can be directly obtained according to the force sensor combined with the needle tube, and the change curve of the liquid-solid contact normal adhesion force and the contact area along with the time in the motion process is obtained through automatic accounting or manual measurement and calculation of the image processing terminal.
A method for measuring the wettability of a solid surface and the liquid-solid contact friction force by using the test device is characterized by comprising the following steps:
the method comprises the following steps: placing a solid sample to be tested on a transparent top plate of a sample table, and dripping liquid drops with known types and volumes to the surface of the solid sample through a needle tube of an injection system by a sample injection system;
step two: inserting a needle tube into the middle position inside a liquid drop, starting the main motion direction of a three-dimensional moving platform, driving a sample platform to make constant-speed relative motion with the needle tube along the Y direction, and shooting a video of the relative motion of the liquid drop and a solid sample at an image processing terminal through a shooting module above the image processing terminal until the liquid drop and the solid sample move to a set position or a set distance;
step three: reading the change characteristics of the advancing angle and the retreating angle of the liquid drop in the solid surface movement process at an image processing terminal according to the recorded video;
step four: the magnitude of the friction force of the liquid-solid interface in the movement process can be directly obtained through a force measuring and sensing system connected with the needle tube, and the change curve of the friction force of the liquid-solid interface in the movement process is obtained through automatic measurement and calculation or manual measurement and calculation of an image processing terminal.
A method for measuring a liquid-solid contact area by using the testing device is characterized by comprising the following steps:
the method comprises the following steps: fixing a solid sample to be tested on a transparent top plate of a sample table, and dripping liquid drops with known types and volumes to the surface of the solid sample through a needle tube of an injection system by a sample injection system;
step two: inserting a needle tube into the liquid drop, starting the main motion direction of a three-dimensional moving platform, driving a sample platform to move relative to the needle tube at a constant speed along the Y direction, and shooting a contact interface image of the liquid drop dragged by the needle tube to move on the surface of the transparent solid sample at an image processing terminal through a shooting module below until the liquid drop and the solid sample move to a set position or a set distance;
step three: according to the recorded video, the change condition of the liquid-solid contact area in the motion process is obtained through automatic measurement and calculation or manual measurement and calculation of the image processing terminal, and then the relation between the friction force and the contact area in the liquid-solid relative friction motion is obtained through analysis.
The invention has the beneficial effects that:
the invention provides a test device for measuring the action state of a liquid-solid interface of a transparent fixed sample, which can synchronously measure the lateral friction force or normal adhesion force between liquid and the sample and the change of the contact interface in the force measuring process, measure the acting force of the liquid on the lateral direction and the vertical direction of the solid surface through a force sensor, and synchronously capture the appearance of the liquid lateral direction and the liquid-solid contact interface through an image capturing system. Compared with the prior art, the invention is more direct and simple. Meanwhile, the invention provides a test method for directly researching the synchronism of the liquid-solid relative to the kinetic friction force and the solid-liquid dynamic contact area, which can be used for developing a new research direction of solid-liquid friction in the field of surface engineering materials and provides a new thought for the research of solid-liquid friction.
Drawings
FIG. 1 is a front view of the overall structure of the testing device of the present invention.
FIG. 2 is a schematic diagram of an operating optical path of the image capture system.
FIG. 3 is a three-dimensional schematic view of the test apparatus of the present invention.
FIG. 4 is a schematic view of the mounting relationship of the syringe and the force sensing system of the present invention.
FIG. 5 is a graph showing the relationship between the friction force or contact area of the solid-liquid relative movement and time.
FIG. 6 is an enlarged partial view of the distal end of the needle cannula.
Reference numerals: 1-base, 2-horizontal adjusting bracket, 201-leveling bottom plate, 202-first upright post, 203-hanger plate, 3-image capturing system, 301-45 degree reflector, 302-background light source, 303-first CCD unit, 304-second CCD unit, 305-image capturing leading-in part, 306-second upright post, 307-light source shell, 308-light shield, 4-sample stage, 401-sample bottom plate, 402-transparent top plate, 403-transparent side plate, 5-sample injection system, 501-needle tube, 502-injector, 503-sample injection support, 504-connecting support, 505-lifting device, 506-pitching joint, 507-rotating shaft, 508-expanding section, 6-force measuring sensing system, 61-torsion sensor, 62-a tension sensor, 7-a three-dimensional moving platform, 71-X direction horizontal rotation screw rod adjusting frames, 72-Y direction horizontal rotation screw rod adjusting frames and 73-Z direction vertical rotation screw rod adjusting frames.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in the figure, the test device for measuring the action state of the liquid-solid interface of the transparent fixed sample comprises a base 1, and an image capturing system 3, a sample stage 4, a sample injection system 5, a force measurement sensing system 6 and an image processing terminal which are arranged on the base 1.
Specifically, as shown in fig. 1-4, the image capturing system 3, the sample stage 4, the sample injection system 5, the force measuring sensing system 6 and the image processing terminal are mounted on the base 1 through a horizontal adjusting bracket 2, the horizontal adjusting bracket 2 includes a leveling base plate 201, a hanging plate 203 and two first columns 202, the two first columns 202 are fixed at two ends of the base 1, the two ends of the leveling base plate 201 are respectively fixed with a hanging plate 203, the tops of the two hanging plates 203 are respectively mounted on the two first columns 202 through a height adjusting device, the levelness of the leveling base plate 201 can be adjusted through the height adjusting device, the height adjusting device is not limited in specific form, and can be, for example, a screw nut structure mounted inside the first columns 202, although the structure is not a necessary technical feature of the present invention, but an improved feature that improves the adaptability of the testing device, without the leveling mechanism, the invention can also solve the technical problem of the invention.
The sample stage 4 is arranged on the base 1 through the three-dimensional moving platform 7, and one running direction of the three-dimensional moving platform 7 is a main moving direction; the sample stage 4 comprises a sample bottom plate 401, a transparent top plate 402 and a transparent side plate 403 connecting the two, wherein the transparent top plate 402 is used for placing a transparent fixed sample to be measured.
The image capturing system 3 comprises a 45-degree reflector 301, a background light source 302 and two parallel shooting modules, wherein the 45-degree reflector 301 is installed between a transparent top plate 402 and a sample bottom plate 401 of a sample stage 4, the shooting modules and the background light source 302 are respectively installed on leveling bottom plates 201 on two sides of the sample stage 4, the shooting directions of the two shooting modules are perpendicular to the main movement direction, the shooting module on the upper portion is used for shooting a solid-liquid contact surface, the shooting module on the lower portion is used for measuring the solid-liquid contact area after being reflected by the 45-degree reflector 301, and the 45-degree reflector 301 can also be a 45-degree reflective prism.
Specifically, the two shooting modules of the present invention are a first CCD unit 303 and a second CCD unit 304, respectively, and the first CCD unit 303 and the second CCD unit 304 are connected to the image processing terminal through an image capturing import component 305; the first CCD unit 303 and the second CCD unit 304 are vertically stacked and fixed together, and then mounted on the leveling base plate 201 through the second upright post 306, and the height of the two CCD units is adjusted to be adapted to the height of the sample stage 4 through the second upright post 306.
The background light source 302 is a flat light source, and adopts an LED parallel light source with an adjustable bright point, specifically, the LED parallel light source is installed in a light source casing 307, a light chopper 308 is further arranged on one side of the light source casing 307 close to the sample stage 4, and an electrical control part is further arranged in the light source casing 307, so that the bright point and the switch of the LED parallel light source can be controlled, and the existing known mature technology is adopted, and is not described again.
The sample injection system 5 comprises a sample introduction support 503, a needle tube 501 and an injector 502, wherein the needle tube 501 and the injector 502 are arranged on the sample introduction support 503, the sample introduction support 503 is arranged on a connecting support 504 through a lifting device 505, the connecting support 504 is arranged on the top of a light source shell 307 through a pitching joint 506, so that a support for the injection system is omitted, the top of the needle tube 501 is connected with the injector 502 through a hose, the lower end of the needle tube 501 is positioned right above a sample platform 4, and the force measurement sensing system 6 is used for measuring the deflection force and the vertical pulling force of the lower end of the needle tube 501 along the main movement direction. The size of the single sample injection liquid drop of the needle tube 501 is 0.1 microliter to 50 microliter, and the lifting device 505 in this embodiment adopts the well-known technology in the prior art, including but not limited to a screw-nut mechanism, and specifically can adopt a high-precision screw-nut mechanism.
In a preferred embodiment, the middle or upper part of the needle tube 501 is mounted on the sample holder 503 through a rotating shaft 507, and the load cell system 6 comprises a torsion sensor 61 and a tension sensor 62 mounted at the rotating shaft 507.
As a preferred embodiment, the three-dimensional moving platform 7 is a three-dimensional moving platform 7 formed by combining X, Y and Z-direction translation mechanisms, wherein the Y direction is a main moving direction, the Z direction is a vertical lifting direction, and the XYZ three-direction movement speed of the three-dimensional moving platform 7 is 0.01 mm to 20 mm per second.
As a preferred embodiment, as shown in FIG. 6, the end of the syringe 501 is provided with an enlarged section 508 to increase the binding force of the syringe to the liquid drop.
As a specific embodiment, the image processing terminal of the present invention may be integrated into a computer.
It should be noted that the lifting device 505 of the sample injection system 5 of the present invention is a mature structure in the prior art, such as a screw nut lifting mechanism, and will not be described again.
Example 1:
a measuring device for synchronously measuring the interaction of a liquid-solid interface and the liquid-solid contact area comprises the following steps:
(1) and turning on a power supply of the testing device and a power supply of the computer, and starting the image processing terminal. Placing a permeable solid sample with a surface structure on a material carrying area of a sample stage 4 containing a 45-degree reflective prism, and opening an image real-time window;
(2) the three-dimensional moving platform 7 of the motion regulating system is manually roughly adjusted, and the imaging of the camera is observed through the display. Adjusting the brightness of the background light source 302 of the second CCD unit 304 and focusing roughly, so that the liquid drop (needle tube 501), the 45-degree reflective prism and the second CCD unit 304 are located on the working light path line as shown in fig. 2, and adjusting the mating microscope to a proper magnification and focusing;
(3) adjusting the camera lens of the first CCD unit 303, the sample and the background light source 302 to be on the same horizontal line, adjusting the matched microscope to a proper magnification and focusing;
(4) after observing the real-time window, controlling the sample injection system 5 to drop 4 μ l of deionized water onto the surface of the sample, and manually adjusting the Z-direction movement of the sample stage 4 to insert the rigid needle tube 501 into the center of the liquid drop;
(5) fixing an X, Z-direction motion adjusting frame of the three-dimensional moving platform 7, setting a motion state of a Y-direction motion adjusting motor with the speed of 1mm/s and the acceleration of zero, and setting the motion distance of 15 mm;
(6) starting a regulating motor moving in the Y direction, opening video recording windows of two CCDs corresponding to the image processing terminal, recording the friction motion process of the rigid needle tube 501 dragging liquid drops on the surface of the permeable sample with the surface structure, ensuring that the rigid needle tube 501 and the liquid drops are always in the display screen window until the distance from the end point stops, and obtaining a synchronous lateral dragging video and an upward looking liquid-solid contact area video.
(7) And (3) respectively carrying out image processing and data result recording on the two videos, and analyzing the numerical qualitative and quantitative relation results of the solid-liquid relative motion friction force and the solid-liquid contact area as shown in a curve 8 in the figure 5.
Example 2:
(1) and turning on a power supply of the testing device and a power supply of the computer, and starting the image processing terminal. Placing a permeable solid sample with a surface structure on a material carrying area of a sample stage 4 containing a 45-degree reflective prism, and opening an image real-time window;
(2) the three-dimensional moving platform 7 of the motion regulating system is manually roughly adjusted, and the imaging of the camera is observed through the display. Adjusting the brightness of the parallel light source of the second CCD unit 304 and focusing roughly, so that the liquid drop (needle tube 501), the 45-degree reflective prism and the second CCD unit 304 are positioned on the working light path line as shown in fig. 2, and adjusting the mating microscope to a proper magnification and focusing;
(3) adjusting the camera lens of the first CCD unit 303, the sample and the background light source 302 to be on the same horizontal line, adjusting the matched microscope to a proper magnification and focusing;
(4) after observing the real-time window, controlling the sample injection system 5 to drop 6 μ l of deionized water onto the surface of the sample, and manually adjusting the Z-direction movement of the sample stage 4 to insert the rigid needle tube 501 into the center of the liquid drop;
(5) fixing X, Z-direction movement adjusting frames, setting the movement state of a Y-direction movement adjusting motor with the speed of 1mm/s and the acceleration of zero, and setting the movement distance of 15 mm;
(6) starting a Y-direction motion adjusting motor of the three-dimensional moving platform 7, opening video recording windows of two CCDs corresponding to the image processing terminal, recording a friction motion process of the rigid needle tube 501 dragging liquid drops on the surface of the permeability sample with the surface structure, ensuring that the rigid needle tube 501 and the liquid drops are always in the display screen window until a distance end point stops, and obtaining a synchronous lateral dragging video and an upward looking liquid-solid contact area video.
(7) And (3) respectively carrying out image processing and data result recording on the two videos, and analyzing the numerical qualitative and quantitative relation results of the solid-liquid relative motion friction force and the solid-liquid contact area as shown in a curve 9 in the figure 5.
Example 3:
(1) and turning on a power supply of the testing device and a power supply of the computer, and starting the image processing terminal. Placing a permeable solid sample with a surface structure on a material carrying area of a sample stage 4 containing a 45-degree reflective prism, and opening an image real-time window;
(2) and manually and roughly adjusting an XYZ three-way sample table adjusting frame of the motion adjusting system, and observing the imaging of the camera through a display. Adjusting the brightness of the parallel light source of the second CCD unit 304 and focusing roughly, so that the liquid drop (needle tube 501), the 45-degree reflective prism and the second CCD unit 304 are positioned on the working light path line shown in the second figure, and adjusting the matched microscope to a proper magnification and focusing;
(3) adjusting the camera lens of the first CCD unit 303, the sample and the background light source 302 to be on the same horizontal line, adjusting the matched microscope to a proper magnification and focusing;
(4) after observing the real-time window, controlling the sample injection system 5 to drop 2 mul of deionized water on the surface of the sample, and manually adjusting the sample stage 4 to insert the needle tube 501 with the force sensor to the right center of the liquid drop;
(5) fixing an X, Y, Z-direction motion adjusting frame of the three-dimensional moving platform 7, setting a motion state with the speed of 0.5mm/s and the acceleration of zero for a motion adjusting motor of a lifting mechanism of the sample injection system 5, and setting the motion distance to be 5 mm;
(6) starting a motion adjusting motor of a lifting device 505 of the sample injection system 5, opening video recording windows of two CCDs corresponding to the image processing terminal, recording the lifting motion process of liquid drops driven by the needle tube 501 on the surface of the permeable sample with the surface structure, ensuring that the needle tube 501 and the liquid drops are always in the window of the display screen until the distance stops from the end point, and obtaining synchronous normal adhesion force and upward-looking liquid-solid contact area video.
(7) And respectively carrying out image processing and data result recording on the two videos, and analyzing qualitative and quantitative relations between the normal adhesion force between the liquid and the sample and the solid-liquid contact area in numerical values.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (10)
1. A test device for measuring the action state of a liquid-solid interface of a transparent fixed sample is characterized in that; the device comprises a base, an image capturing system, a sample stage, a sample injection system, a force measurement sensing system and an image processing terminal, wherein the image capturing system, the sample stage, the sample injection system, the force measurement sensing system and the image processing terminal are arranged on the base; the sample injection system comprises a sample injection support, a needle tube and an injector which are arranged on the sample injection support, the sample introduction support is arranged on the base through a lifting device, the top of the needle tube is connected with the injector through a hose, the lower end of the needle tube is positioned right above the sample platform, the force measuring and sensing system is used for measuring the deflection force of the lower end of the needle tube along the main movement direction and the pull force in the vertical direction, the image capturing system comprises a 45-degree inclined reflector, a background light source and two parallel shooting modules, the 45-degree reflector is arranged between the transparent top plate and the sample bottom plate of the sample table, the shooting modules and the background light source are respectively arranged on the bases at the two sides of the sample table, the shooting directions of the two shooting modules are vertical to the main motion direction, the shooting module positioned at the upper part is used for shooting a lateral projection surface of the liquid drop, and the shooting module positioned at the lower part is used for measuring the solid-liquid contact area after being reflected by the 45-degree reflector.
2. The test device of claim 1, wherein; the middle part or the upper part of the needle tube is arranged on the sample injection support through a rotating shaft, and the force measuring sensing system comprises a torsion sensor and a tension sensor which are arranged at the rotating shaft.
3. The test device of claim 2, wherein; the background light source is a flat light source, and particularly adopts an LED parallel light source with adjustable brightness.
4. The test device of claim 1 or 2, wherein; the three-dimensional moving platform is formed by combining X, Y and Z-direction translation mechanisms, wherein the Y direction is a main motion direction, and the Z direction is a vertical lifting direction; the XYZ three-way movement speed of the three-dimensional moving platform is 0.01-20 mm per second.
5. The test device of claim 1 or 2, wherein; the tail end of the needle tube is provided with an expansion section for increasing the binding force with the liquid drops.
6. The test device of claim 1 or 2, wherein; the size of the single sample injection liquid drop of the needle tube is 0.1 microliter-50 microliter.
7. The test device of claim 1 or 2, wherein; the shooting module is a CCD unit, and images and videos captured by the two CCD units are processed through an image processing terminal.
8. A method for measuring liquid-solid contact normal adhesion force and contact area using the test device of claim 1, comprising the steps of:
the method comprises the following steps: placing a solid sample to be tested on a transparent top plate of a sample table, and dripping liquid drops with known types and volumes to the surface of the solid sample through a needle tube of an injection system by a sample injection system;
step two: starting a lifting device, controlling the needle tube to ascend at a specified speed through the lifting device, simultaneously starting two shooting modules, shooting the relative motion of the liquid drops and the solid sample by the upper shooting module, and shooting the contact interface image of the liquid drops and the solid sample by the lower shooting module until the liquid drops are separated from the surface of the sample or the liquid drops are separated from the needle tube;
step three: the magnitude of the liquid-solid contact normal adhesion force is directly obtained according to the force sensor combined with the needle tube, and the change curve of the liquid-solid contact normal adhesion force and the contact area along with the time in the motion process is obtained through automatic measurement and calculation or manual accounting of the image processing terminal.
9. A method for measuring the wettability of a solid surface and the friction force of liquid-solid contact by using the test device of claim 1, comprising the steps of:
the method comprises the following steps: placing a solid sample to be tested on a transparent top plate of a sample table, and dripping liquid drops with known types and volumes to the surface of the solid sample through a needle tube of an injection system by a sample injection system;
step two: starting a main motion direction of the three-dimensional moving platform, driving the sample platform and the needle tube to perform relative motion at a specified speed along the Y direction, and shooting a video of the relative motion of the liquid drop and the solid sample through a shooting module above the image processing terminal until the liquid drop and the solid sample move to a set position or a set distance;
step three: reading the change characteristics of the advancing angle and the retreating angle of the liquid drop in the solid surface movement process at an image processing terminal according to the recorded video;
step four: the magnitude of the friction force of the liquid-solid interface in the movement process is directly obtained through a force measuring and sensing system connected with the needle tube, and the change curve of the friction force of the liquid-solid interface in the movement process is obtained through automatic measurement and calculation or manual measurement and calculation of an image processing terminal.
10. A method of making a liquid-solid contact area measurement using the test device of claim 1, comprising the steps of:
the method comprises the following steps: fixing a solid sample to be tested on a transparent top plate of a sample table, and dripping liquid drops with known types and volumes to the surface of the solid sample through a needle tube of an injection system by a sample injection system;
step two: starting a main motion direction of the three-dimensional moving platform, driving the sample platform and the needle tube to perform relative motion at a specified speed along the Y direction, and shooting a contact interface image when the needle tube drags the liquid drop to move on the surface of the transparent solid sample at the image processing terminal through a shooting module below the image processing terminal until the liquid drop and the solid sample move to a set position or a set distance;
step three: according to the recorded video, the change condition of the liquid-solid contact area in the motion process is obtained through automatic measurement and calculation or manual measurement and calculation of the image processing terminal, and then the relation between the friction force and the contact area in the liquid-solid relative friction motion is obtained through analysis.
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