CN110487679A - It is a kind of measurement drop surface of solids frictional force device - Google Patents
It is a kind of measurement drop surface of solids frictional force device Download PDFInfo
- Publication number
- CN110487679A CN110487679A CN201910694783.0A CN201910694783A CN110487679A CN 110487679 A CN110487679 A CN 110487679A CN 201910694783 A CN201910694783 A CN 201910694783A CN 110487679 A CN110487679 A CN 110487679A
- Authority
- CN
- China
- Prior art keywords
- drop
- sample
- dynamometry
- sample stage
- probe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Investigating Or Analysing Biological Materials (AREA)
Abstract
The invention discloses a kind of drops that measures in the device of surface of solids frictional force, including sample stage, image capture system, the kinetic control system of at least one-dimensional relative motion occurs for dynamometry probe and driving sample stage and dynamometry probe, the sample stage is for fixing solid sample to be tested, for placing drop to be tested on solid sample, the dynamometry probe is installed on above drop by probe bracket, dynamometry probe includes having elastic portion and the engaging portion positioned at elastic portion end, when test, the engaging portion is extend into drop, for increasing the binding force of drop and dynamometry probe, elastic portion is tubular elastomer, for elastic deformation to occur when with sample stage relative motion occurs for dynamometry probe, described image capture system be used to capture the dynamometry probe being inserted into drop when with sample stage generation relative motion the image that occurs and Video.The present apparatus can accurately measure drop in surface of solids frictional force, and structure is simple, high-efficient, low in cost.
Description
Technical field
Interface analysis testing field belonging to the present invention is related to a kind of interface friction force device, in particular to a kind of measurement liquid
Drip the device in surface of solids frictional force.
Background technique
Solid liquid interface behavior is ubiquitous in our life, and drop shows not in different material or body structure surface
Same infiltration behavior.It is that the low of representative is sticked super hydrophobic surface and sticked with the height that " red rose " is representative super-hydrophobic with " lotus leaf "
The attracted by surfaces concern of many researchers, both different solid liquid interface behaviors are in daily life and industry
Extremely broad application prospect is suffered from production.
Due to the low adhesion very little for sticking super hydrophobic surface and drop, cause drop that there is smaller rub with super hydrophobic surface
Power is wiped, drop is easy to tumble from this surface, so the low super hydrophobic surface that sticks is with very strong self-cleaning property ability, waterproof
The ability that antifouling capacity and anti-fog and antifrost freeze.Based on these performances, this low super hydrophobic surface that sticks has in production and living
Many applications, such as apply on glass, cement building, it can make building that there is self-cleaning performance, mitigate artificial cleaning
Difficulty；Applied to outdoor electric pole, sticking for sleet can be reduced on solar panel；It applies in textile clothes direction,
Rain-proof garment can be made, keep off the rain tent and water proof anti-soil shoes；It applies in production ship direction, can reduce ship traveling process
In resistance, reduce energy consumption.
Drop, which sticks super hydrophobic surface often in height, has biggish frictional force, is not easily disconnected from height and sticks super hydrophobic surface,
Therefore this surface can be used as " manipulator " to transport micro drop, i.e., has the high super hydrophobic surface sticked real by this
The lossless transfer of existing some expensive drops.The surface can be applicable to microfluid design field, realize flow velocity and stream to microfluid
Amount control；It can be applicable to drop assembling sphere, design the structure of similar " cobweb " such as to collect the water in air, supply water shortage
Area.
By studying solid liquid interface behavior, people can realize automatically cleaning, absorption, freezing, anti-adhesive etc. in different field
Function.In solid liquid interface behavior, solid liquid interface frictional force is drop in the most important active force of the surface of solids, studies solid-liquid circle
Face frictional force can greatly help to understand that the wetability of liquid and solid interface is under micro-nano-scale.Therefore, how simply
Precise measurement solid liquid interface frictional force becomes a critically important content in solid liquid interface behavioral study.Currently, to solid liquid interface
The research of frictional force mainly passes through the realization of the devices such as hang plate and atomic force microscope.Tilting panel assembly is to pass through observed drop
Drop is calculated in surface of solids frictional force, although this method is grasped in the characteristics of motion on hang plate in turn under the effect of gravity
Make simply, but measurement accuracy is low, it is very big by droplet size affect.In addition, atomic force microscope and surface meter etc. belong to essence
Close instrument suffers from high want to experimental situation, experimenter, experimentation and test specimen during measuring frictional force
It asks, and small changing factor will cause great experimental error.It would therefore be highly desirable to develop, a kind of operation is convenient, and measurement accuracy is high,
The simple device of method, for quick and precisely measurement drop in surface of solids frictional force.
Summary of the invention
The purpose of the present invention is to provide a kind of accurate rapid survey drop surface of solids frictional force device.
It is an object of the invention to: in view of the deficiencies of the prior art, a kind of accurate rapid survey drop is provided in solid
The device of skin-friction force.The device by calculate drop in the frictional force size of the surface of solids, can be to drop in solid table
The dynamic wellability in face carries out quantitatively characterizing, and then accurately distinguishes the surface with different solid boundary moisture behavior.The invention
It is greatly promoted the research of solid liquid interface wetting behavior, the wetting mechanism research of solid liquid interface under micro-scale is provided new
Thinking provides a kind of means of novelty for research surface adhesion or surface draft reduction material.
In order to realize the above functions, it is as follows to provide technical solution by the present invention:
It is a kind of measurement drop surface of solids frictional force device, it is characterised in that: described device includes sample stage, liquid
The fortune of at least one-dimensional relative motion occurs for sampling system, image capture system, dynamometry probe and driving sample stage and dynamometry probe
Autocontrol system；
The sample stage is used to place drop to be tested on solid sample for fixing solid sample to be tested；
The dynamometry probe is installed on above drop by probe bracket, and dynamometry probe includes with elastic portion and being located at bullet
Property portion end engaging portion, when test, the engaging portion is extend into drop, for increasing the combination of drop and dynamometry probe
Power；The elastic portion is tubular elastomer, for elastic deformation to occur when with sample stage relative motion occurs for dynamometry probe；
Liquid is transported to solid-like to be tested by the tubular elastomer that the Liquid sample introduction system is popped one's head in by dynamometry
Product surface；
Described image, which captures system and is used to capture the dynamometry being inserted into drop and pops one's head in, is occurring relative motion with sample stage
The motion profile of the fluorescent tracing particle of the amount of elastic deformation of Shi Fasheng and the shape of drop and drop internal.
As an improvement, the size of the drop is 0.1 microlitre~50 microlitres.
As an improvement, the kinetic control system is three-dimensional mobile platform, definition driving sample stage and dynamometry probe occur
The direction of relative motion is direction of primary motion, and described image capture system photographs direction is vertical with direction of primary motion, the main fortune
The speed of related movement in dynamic direction is 0.01 millimeter~20 millimeters per second.
As an improvement, the engaging portion of the dynamometry probe and the contact surface of drop are greater than or equal to along direction of primary motion
Elastic portion and drop contact face；The engaging portion shape of the dynamometry probe is plate, cylindrical type, circular ring type, the ring-like, L of ellipse
Type, V type, any one in inverted T shaped and M type.
As an improvement, the three-dimensional mobile platform is equipped with the leveling bracket for adjusting levelness, the sample stage is installed on
It levels on bracket.
As an improvement, the sample stage is equipped with temperature control chamber, and for adjusting solid sample, drop and ambient temperature, temperature
The slit being equipped with above chamber convenient for dynamometry probe relative motion is controlled, temperature control chamber is equipped in the two sides perpendicular to direction of primary motion
The transparent window of test image is captured convenient for image capture system.
As an improvement, it includes projection light source, optical image unit and image processing terminal, projection that described image, which captures system,
Light source and optical image unit are separately mounted to the two sides of sample stage, and projection light source is source of parallel light, face sample stage, light source
Brightness is freely adjustable, and optical image unit is fixed on the opposite side of projection light source, for shoot on sample stage solid sample and
The image or video of drop, image processing terminal is used to automatically extract the appearance profile of drop for image and video and dynamometry is visited
Image data when capitiform becomes, and the deformation quantity that drop is popped one's head in the contact angle and dynamometry of the surface of solids is calculated, liquid is calculated
Drip the frictional force in the surface of solids.
As an improvement, the optical image unit that described image captures system has fluorescence detection channel, for shooting drop
The image or video of Internal Fluorescent trace particle.
A method of using above-mentioned apparatus measurement drop in surface of solids frictional force, which is characterized in that including following step
It is rapid:
Solid sample to be tested is fixed on sample stage by step 1, using Liquid sample introduction system by drop to be tested
It is loaded into solid sample surface by the tubular elastomer that dynamometry is popped one's head in, and dynamometry probe is inserted into drop internal；
Along direction of primary motion and dynamometry probe opposite fortune occurs for step 2, starting kinetic control system, driving sample stage
It is dynamic, while starting dynamometry probe and Liquid particle image in image capture system shooting motion process, until drop and solid sample
Relative motion is to setting position or set distance；
Step 3, the frictional force size are calculated by formula F=K*D, wherein F is frictional force of the drop in the surface of solids, K
For the coefficient of elasticity of dynamometry probe, D is the horizontal distance of dynamometry probe end relative initial position offset, and frictional force can be by image
Integrated software automatic measurement & calculation or artificial measuring and calculating built in acquisition unit.
A method of using above-mentioned apparatus observed drop in surface of solids motion state, which is characterized in that including following
Step:
Solid sample to be tested is fixed on sample stage by step 1, and fluorescence micro-nano is added in liquid to be tested
Grain is simultaneously uniformly dispersed, and will load solid sample surface containing the drop of fluorescence micro-nano particle using Liquid sample introduction system, and will survey
Power probe is inserted into drop internal；
Step 2, starting kinetic control system, driving sample stage and dynamometry, which are popped one's head in, occurs opposite fortune along direction of primary motion
It is dynamic, while starting Liquid particle image and video in image capture system shooting motion process, fluorescence is shot by fluorescence detection channel
Movement of the micro-nano particle in drop；
Step 3, by the motion profile of fluorescence micro-nano particle, judge boundary of drop during solid sample mantle friction
Face phenomenon.
The invention has the benefit that
The present invention measures drop in the device of surface of solids frictional force, and structure is simple, and test process is convenient, can be quickly smart
The frictional force of solid liquid interface really is obtained, realizes to drop in the quantitatively characterizing of surface of solids wellability, is convenient for research micro-nano ruler
Solid liquid interface behavior under degree, has greatly facilitated the mechanism study to solid liquid interface wetting behavior on micro-scale, is surface
Stick or the research in the fields such as surface draft reduction material provides a kind of means of novelty.The invention can accurately distinguish different glutinous
Subordinate list face for design preparation there is the structural material of different Adhering capacities to provide important reference, the structural wood being prepared
Material can be applied in terms of surface adhesion or surface drag reduction, such as automatically cleaning, absorption, freezing, anti-adhesive etc..
Detailed description of the invention
Fig. 1 is that drop is measured in the embodiment of the present invention in the main view of the device of surface of solids frictional force.
Fig. 2 is that drop is measured in the embodiment of the present invention in the top view of the device of surface of solids frictional force.
The drop profile diagram that optical image unit is shot during the practical friction measurement of Fig. 3, wherein Fig. 3 (a) is needle tubing
Suitable moving camera shooting figure does not occur in drop, Fig. 3 (b) is needle tubing relative to shooting figure in solid sample motion process.
Fig. 4 is friction measurement process schematic, and wherein Fig. 4 (a) is that needle tubing is inserted into schematic diagram in drop, and Fig. 4 (b) is needle
Pipe is relative to solid sample motion process schematic diagram.
Fig. 5 is 1 drop of embodiment and sample surfaces frictional force time history plot.
Fig. 6 is 2 drop of embodiment and sample surfaces frictional force time history plot.
Fig. 7 is 3 drop of embodiment and sample surfaces frictional force time history plot.
Appended drawing reference: 1- pedestal, 2-X is to feed screw nut straight line slide unit, and 3-Y is to feed screw nut straight line slide unit, 4- sample stage,
5- optical image unit, 6- lifting regulating mechanism, 7- dynamometry probe, 8- projection light source, 9- image processing terminal, 10- temperature control cavity
Room, 11- drop, 12- solid sample, 13-Z is to electric pushrod, 14- needle tubing.
Specific embodiment
The invention patent is described further with reference to the accompanying drawing.
As depicted in figs. 1 and 2, a kind of drop that measures is caught in the device of surface of solids frictional force, including sample stage 4, image
It catches system, dynamometry probe 7 and driving sample stage 4 and the kinetic control system of at least one-dimensional relative motion, institute occurs for dynamometry probe 7
It states sample stage 4, image capture system, dynamometry probe 7 and kinetic control system to be installed on pedestal 1, the sample stage 4 is used
In, for placing drop 11 to be tested, the dynamometry probe 7 is logical on the solid sample 12 that fixation is to be tested, solid sample 12
It crosses probe bracket and is installed on 11 top of drop, the dynamometry probe 7 includes having elastic portion and the combination positioned at elastic portion end
Portion, when test, the engaging portion is extend into drop 11, for increasing the binding force of drop 11 and dynamometry probe 7, the elasticity
Portion is tubular elastomer, for occurring elastic deformation when with sample stage 4 relative motion occurs for dynamometry probe 7, the liquid into
Liquid is transported to 12 surface of solid sample to be tested by the hollow inside of tubular elastomer by sample system；Described image captures
System is used to capture the dynamometry probe 7 being inserted into drop 11 and the elastic deformation occurred when relative motion is occurring with sample stage 4
Amount.
As specific embodiment, as depicted in figs. 1 and 2, the kinetic control system includes three-dimensional mobile platform, and definition is driven
The direction that with sample stage 4 relative motion occurs for dynamic dynamometry probe 7 is direction of primary motion, described image capture system photographs direction with
Direction of primary motion is vertical, and three-dimensional mobile platform of the present invention uses two translation freedoms of X in plane, Y-direction to add Z-direction
Flexible freedom degree composition, specially planar X are flat to feed screw nut straight line slide unit 2 and the composition of Y-direction feed screw nut straight line slide unit 3
The cross slid platform of in-plane moving, Z-direction electric pushrod 13 forms the lifting freedom degree of a Z-direction, in the present embodiment based on Y-direction
The direction of motion, therefore Y-direction feed screw nut straight line slide unit 3 is higher using precision, the slower leadscrew-nut mechanism system of movement velocity
At straight line slide unit, velocity interval be 0.05 millimeter it is per second~20 millimeters it is per second；Using Y-direction as direction of primary motion in the present embodiment
When, then shooting direction be X to, can guarantee in this way shooting dynamometry pop one's head in 7 deformation quantity accuracys, without angular error.
The sample stage 4 by motor control or can be manually controlled along X, Y, and Z-direction is carried out even with adjustable speed
Speed or variable motion, sample stage 4 can drive solid sample 12 thereon for linear motion, back and forth movement or rotation fortune
It is dynamic.Translational velocity range is 0.05 millimeter of per second~20 millimeters of per second, rotational velocity range are as follows: 0.1 degree per second~30 degree per seconds.
The sample stage 4 has levelling function, can make sample surfaces horizontal by adjusting the inclination of sample stage 4 or pitch angle.Sample
Sample platform 4 connects temperature control chamber 10, and temperature control chamber 10 can control sample stage 4 with certain rate heating or cooling, Huo Zhebao
Certain temperature is held, temperature range is subzero 50 degrees Celsius~200 degrees Celsius.
In the embodiment of the present invention, it includes projection light source 8, optical image unit 5 and image procossing that described image, which captures system,
Terminal 9, projection light source 8 and optical image unit 5 are separately mounted to the two sides of sample stage 4, and projection light source 8 is source of parallel light, just
Against sample stage 4, light-source brightness is freely adjustable, and optical image unit 5 is fixed on the opposite side of projection light source 8, for shooting sample
The image or video of sample in sample platform 4, the amplification factor of optical image unit 5 is adjustable, and range is 1 times~10 times, image procossing
Terminal 9 is used to automatically extract image data when the 7 generation relative motion of drop 11 and dynamometry probe for image and video, and counts
Calculate the deformation quantity of dynamometry probe 7, can specifically automatically extract 11 contour line of drop for image and video, advancing angle, receding angle,
11 contact length of drop, the data such as dynamometry 7 terminal horizontal offset distances of probe.
As a kind of preferred embodiment, the three-dimensional mobile platform is equipped with leveling bracket, and the sample stage 4 is installed on tune
On flat bracket, sample stage 4 can be made to be leveled using leveling bracket.
As a kind of preferred embodiment, the hoistable platform that the three-dimensional mobile platform is equipped with is equipped with pitching movement joint
With rotary motion joint, by pitching movement joint and rotary motion joint sample stage 4 and solid sample 12 thereon are done
Rotary motion or pitching movement adapt to the adjustment of different motion angle and need.
As a kind of preferred embodiment, the sample stage 4 is equipped with temperature control chamber, for adjusting solid sample 12, drop
And ambient temperature, temperature control chamber top are equipped with the slit convenient for dynamometry 7 relative motions of probe, temperature control chamber is perpendicular to main motion
The two sides in direction are equipped with the transparent window that test image is captured convenient for image capture system.The dynamometry probe 7 uses hydrophilic material
Material is made, and along direction of primary motion, the engaging portion of dynamometry probe 7 is greater than connecing with drop 11 for elastic portion with the contact surface of drop 11
Contacting surface.
For the device of that embodiment of the invention, the drop 11 is added to 12 surface of solid sample by Liquid sample introduction system,
Certainly it is used as a kind of concrete case, as shown in figure 3, being specifically made into dynamometry probe 7 using needle tubing 14, the tube body of needle tubing 14 is
For elastic portion, 14 end of needle tubing is the engaging portion of elastic portion end, not only plays the role of liquid feeding using needle tubing 14, but also as elasticity
Part distortion dynamometry effect, as shown in Figure 1, the Liquid sample introduction system includes lifting regulating mechanism 6 and sample injector, the lifting
Regulating mechanism 6 is used to adjust the height of sample injector, and lifting regulating mechanism 6 is equipped be connected with the piston rod of sample injector electronic and pushes away
Bar drives the piston rod movement of sample injector using electric pushrod, realizes the dropwise addition of certain volume drop 11, and drop 11 is added dropwise
Volume range be 0.05 microlitre~100 microlitres.
The sample injector is syringe construction (being not drawn into figure), is made of piston rod and syringe, syringe outlet and needle
At the top of pipe 14 be connected, the material of needle tubing 14 can be the pure metal of known elasticity coefficient, alloy and high molecular material one kind or
Several compositions, the overall diameter range of needle tubing 14 are as follows: 5 microns~600 microns.14 surface of needle tubing can be hydrophilic, hydrophobic or portion
Divide hydrophilic and part hydrophobic.In addition, 14 terminal end shape of needle tubing can be cylindrical type, circular ring type, oval ring-like, L-type, V-type, the T that falls
The combination of one or more of type, M type.
As shown in figure 4, being solid liquid interface friction measurement process schematic, when Fig. 4 (a) is that drop 11 does not have started movement
Schematic diagram, 14 end of needle tubing is inserted among drop 11 at this time.When sample stage 4 drives solid sample 12 to move with certain speed
When, as shown in Fig. 4 (b), drop 11 draws needle tubing 14 and shifts, and the horizontal distance for deviating initial position is D.
A method of using above-mentioned apparatus observed drop in surface of solids motion state, comprising the following steps:
Solid sample 12 to be tested is mounted on sample stage by step 1, and fluorescence micro-nano is added in liquid to be tested
Particle is simultaneously uniformly dispersed, and will load 12 surface of solid sample containing the drop of fluorescence micro-nano particle using Liquid sample introduction system, and
Dynamometry probe 7 is inserted into drop internal；
Along direction of primary motion opposite fortune occurs for step 2, starting kinetic control system, driving sample stage and dynamometry probe 7
It is dynamic, while starting Liquid particle image and video in image capture system shooting motion process, fluorescence is shot by fluorescence detection channel
Movement of the micro-nano particle in drop；
Step 3, by the motion profile of fluorescence micro-nano particle, judge drop during 12 mantle friction of solid sample
Interfacial phenomenon, i.e., by shooting video observe fluorescent particles be in drop rotate along linear translation or in drop, thus
Drop is judged relative to 12 apparent motion state of solid sample, to judge that frictional force is sliding friction or rolling friction, i.e.,
Fluorescent particles are linear translation, then solid liquid interface is sliding friction, i.e. fluorescent particles rotate in drop, then solid liquid interface is rolling
Dynamic friction.
The following are the probe 7 using needle tubing 14 as dynamometry using apparatus of the present invention measurement drop the three of surface of solids frictional force
A embodiment:
Embodiment 1:
It is a kind of using above-mentioned measurement drop surface of solids frictional force device, for testing ultrapure water drop 11 and having
Frictional force between the dimethyl silicone polymer sample of micron groove structure, comprising the following steps:
Step 1: there is the solid sample 12 of micron groove structure to be fixed on sample stage 4 surface, the slot of groove structure
50 microns wide, 50 microns of separation, slot is 30 microns high.
Step 2: it is adjusted by the Y-direction feed screw nut straight line slide unit 3 and X of three-dimensional mobile platform to feed screw nut straight line slide unit 2
It saves immediately below sample stage 4 to needle tubing 14, needle tubing 14 is adjusted by lifting regulating mechanism 6 and is arrived close to 12 centre of surface position of solid sample
It sets, the piston for pushing sample injector is controlled by electric pushrod, 4 μ L drops 11 are injected by needle tubing 14 and arrive 12 surface of solid sample.
Step 3: opening projection light source 8 and optical image unit 5, by adjusting 4 position of sample stage at computer picture
Reason terminal 9 obtains the clear profile of drop 11, so that 14 end of needle tubing is entered 11 center of drop by adjusting lifting regulating mechanism 6.
Step 4: starting Y-direction feed screw nut straight line slide unit 3, setting sample stage 4 are even with 0.05 millimeter of constant speed per second
Speed movement makes needle tubing 14 and solid sample 12 that relative motion occur in Y-direction, and optical image unit 5 is in X to shooting.Motion process
Middle needle tubing 14 occurs bending and deformation.Entire motion process is recorded by optical image unit 5, when drop 11 moves to disengaging solid
Stop the movement of sample stage 4 when 12 surface of sample.The video of 11 motion process of drop is exported finally by image processing terminal 9,
And the size of 14 real time offset distance of needle tubing is automatically derived by image processing terminal 9, it should be pointed out that be due to optical imagery
The relative position of unit 5 and drop almost fixed displacement very little, therefore can both pass through image processing terminal 9 and obtain needle tubing automatically
The size of 14 real time offset distances can also be obtained manually according to shooting dimension of picture, can also be placed in drop position
The mode of scale is demarcated, or directlys adopt the camera with scale.
Step 5: bringing the coefficient of elasticity of the offset distance of needle tubing 14 and needle tubing 14 into formula F=K*D, is calculated solid
Liquid interface friction force size time history plot (as shown in Figure 5), the kinetic force of friction size of solid liquid interface are about 20 micro-
Ox.
Embodiment 2:
It is a kind of using above-mentioned measurement drop surface of solids frictional force device, for test ultrapure water drop with have it is micro-
Frictional force between the oxidation copper sample of rice circular cone columnar arrays structure, comprising the following steps:
Step 1: solid sample 12 is fixed on sample stage 4, and 12 surface of solid sample has conical array array structure,
Conical base diameter is 30 microns, 35 microns high.
Step 2: it is adjusted by the Y-direction feed screw nut straight line slide unit 3 and X of three-dimensional mobile platform to feed screw nut straight line slide unit 2
It saves sample stage 4 and arrives needle tubing 14, needle tubing 14 is adjusted by lifting regulating mechanism 6 and is arrived close to 12 centre of surface position of solid sample, is led to
The piston rod for crossing electric pushrod control sample injector injects 8 μ L drops 11 by needle tubing 14 and arrives 12 surface of solid sample.
Step 3: opening projection light source 8 and optical image unit 5, by adjusting 4 position of sample stage at computer picture
Reason terminal 9 obtains the clear profile of drop 11, so that 14 end of needle tubing is entered 11 center of drop by adjusting lifting regulating mechanism 6.
Step 4: starting Y-direction feed screw nut straight line slide unit 3, setting sample stage 4 are even with 0.1 millimeter of constant speed per second
Speed movement makes needle tubing 14 and solid sample 12 that relative motion occur in Y-direction, and optical image unit 5 is in X to shooting.Motion process
Middle needle tubing 14 occurs bending and deformation.Entire motion process is recorded by optical image unit 5, when drop 11 moves to disengaging solid
Stop the movement of sample stage 4 when 12 surface of sample.The video of 11 motion process of drop is exported finally by image processing terminal 9,
And the size of 14 real time offset distance of needle tubing is automatically derived by image processing terminal 9.
Step 5: bringing the coefficient of elasticity of the offset distance of needle tubing 14 and needle tubing 14 into formula F=K*D, is calculated solid
Liquid interface friction force size time history plot (as shown in Figure 6), the kinetic force of friction size of solid liquid interface are about 60 micro-
Ox.
Embodiment 3:
It is a kind of using above-mentioned measurement drop surface of solids frictional force device, for test ethylene glycol drop with have it is micro-
Frictional force between the dimethyl silicone polymer sample of rice circular cylindrical shape array structure, comprising the following steps:
Step 1: solid sample 12 is fixed on sample stage 4, and 12 surface of solid sample has cylindrical array array structure,
Body diameter is 30 microns, 35 microns high.
Step 2: it is adjusted by the Y-direction feed screw nut straight line slide unit 3 and X of three-dimensional mobile platform to feed screw nut straight line slide unit 2
It saves sample stage 4 and arrives needle tubing 14, needle tubing 14 is adjusted by lifting regulating mechanism 6 and is arrived close to 12 centre of surface position of solid sample, is led to
The piston rod that control software control pushes sample injector is crossed, 6 μ L drops 11 are injected by needle tubing 14 and arrive 12 surface of solid sample.
Step 3: opening projection light source 8 and optical image unit 5, by adjusting 4 position of sample stage at computer picture
Reason terminal 9 obtains the clear profile of drop 11, so that 14 end of needle tubing is entered 11 center of drop by adjusting lifting regulating mechanism 6.
Step 4: starting Y-direction feed screw nut straight line slide unit 3, setting sample stage 4 are even with 0.05 millimeter of constant speed per second
Speed movement makes needle tubing 14 and solid sample 12 that relative motion occur in Y-direction, and optical image unit 5 is in X to shooting.Motion process
Middle needle tubing 14 occurs bending and deformation.Entire motion process is recorded by optical image unit 5, when drop 11 moves to disengaging solid
Stop the movement of sample stage 4 when 12 surface of sample.The video of 11 motion process of drop is exported finally by image processing terminal 9,
And the size of 14 real time offset distance of needle tubing is automatically derived by artificial or software.
Step 5: bringing the coefficient of elasticity of the offset distance of needle tubing 14 and needle tubing 14 into formula F=K*D, is calculated solid
Liquid interface friction force size time history plot (as shown in Figure 7), the kinetic force of friction size of solid liquid interface are about 85 micro-
Ox.
Embodiment 4: fluorescent particles move in observed drop
The image capture system of device by above-mentioned measurement drop in surface of solids frictional force is changed to high definition high speed fluorescence and takes the photograph
Interface Motion shape as head, for testing ultrapure water drop between dimethyl silicone polymer sample with micron groove structure
State, comprising the following steps:
Step 1: there is the solid sample 12 of micron groove structure to be fixed on sample stage 4 surface, the slot of groove structure
50 microns wide, 50 microns of separation, slot is 30 microns high.
Step 2: it is adjusted by the Y-direction feed screw nut straight line slide unit 3 and X of three-dimensional mobile platform to feed screw nut straight line slide unit 2
It saves sample stage 4 and arrives needle tubing 14, needle tubing 14 is adjusted by lifting regulating mechanism 6 and is arrived close to 12 centre of surface position of solid sample, is led to
The piston rod for crossing electric pushrod control sample injector arrives 12 surface of solid sample, drop by 14 movement injection of needle tubing, 4 μ L drop 11
Contain the nanoparticle with fluorescence in 11.
Step 3: opening high definition high speed fluorescence camera, by adjusting 4 position of sample stage in Computer Image Processing terminal
9 obtain the clear profile of drop 11, so that 14 end of needle tubing is entered 11 center of drop by adjusting lifting regulating mechanism 6.
Step 4: starting Y-direction feed screw nut straight line slide unit 3, setting sample stage 4 are even with 0.05 millimeter of constant speed per second
Speed movement makes needle tubing 14 and solid sample 12 that relative motion occur in Y-direction, and optical image unit 5 is in X to shooting.Pass through optics
Imaging unit 5 records entire motion process, stops the fortune of sample stage 4 when drop 11, which moves to, is detached from 12 surface of solid sample
It is dynamic.Can be using fluorescent particles in observed drop 11 as rotary motion, i.e., the solid liquid interface is rolling friction.
In certain the present embodiment, needle tubing 14 is inserted into drop process, either above-mentioned declined by lifting regulating mechanism 6
Needle tubing 14 is completed, and is also possible to rise the above-mentioned completion of solid sample 12 by the Z-direction electric pushrod 13 of three-dimensional mobile platform.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.If this
Field technical staff is altered or modified not departing from the unsubstantiality that spirit of the invention is done, should belong to power of the present invention
The claimed range of benefit.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in correlative technology field, are similarly included in
In scope of patent protection of the invention.
Claims (10)
1. it is a kind of measurement drop surface of solids frictional force device, it is characterised in that: described device include sample stage, liquid into
The movement of at least one-dimensional relative motion occurs for sample system, image capture system, dynamometry probe and driving sample stage and dynamometry probe
Control system；
The sample stage is used to place drop to be tested on solid sample for fixing solid sample to be tested；
The dynamometry probe is installed on above drop by probe bracket, and dynamometry probe includes with elastic portion and being located at elastic portion
The engaging portion of end, when test, the engaging portion is extend into drop, for increasing the binding force of drop and dynamometry probe；Institute
Stating elastic portion is tubular elastomer, for elastic deformation to occur when with sample stage relative motion occurs for dynamometry probe；
Liquid is transported to solid sample surface to be tested by the tubular elastomer that the Liquid sample introduction system is popped one's head in by dynamometry；
Described image captures system and is used to capture the dynamometry probe being inserted into drop hair when relative motion occurs with sample stage
The motion profile of the fluorescent tracing particle of the shape and drop internal of raw amount of elastic deformation and drop.
2. device of the measurement drop in surface of solids frictional force as described in claim 1, it is characterised in that: the size of the drop
It is 0.1 microlitre~50 microlitres.
3. device of the measurement drop in surface of solids frictional force as described in claim 1, it is characterised in that: the motion control system
System is three-dimensional mobile platform, and the direction that relative motion occurs for definition driving sample stage and dynamometry probe is direction of primary motion, described
Image capture system shooting direction is vertical with direction of primary motion, and the speed of related movement of the direction of primary motion is 0.01 millimeter~
20 millimeters per second.
4. device of the measurement drop in surface of solids frictional force as claimed in claim 3, it is characterised in that: along main motion side
To the engaging portion of the dynamometry probe and the contact surface of drop are greater than or equal to elastic portion and drop contact face；The dynamometry is visited
The engaging portion shape of head is plate, cylindrical type, circular ring type, oval ring-like, L-type, V-type, any one in inverted T shaped and M type.
5. kinetic control system as claimed in claim 3, it is characterised in that: the three-dimensional mobile platform, which is equipped with, adjusts levelness
Leveling bracket, the sample stage be installed on leveling bracket on.
6. kinetic control system as claimed in claim 3, it is characterised in that: the sample stage is equipped with temperature control chamber, for adjusting
Solid sample, drop and ambient temperature are saved, the slit convenient for dynamometry probe relative motion, temperature control chamber are equipped with above temperature control chamber
The transparent window that test image is captured convenient for image capture system is equipped in the two sides perpendicular to direction of primary motion.
7. device of the measurement drop in surface of solids frictional force as described in claim 1, it is characterised in that: described image captures system
System includes projection light source, optical image unit and image processing terminal, and projection light source and optical image unit are separately mounted to sample
The two sides of sample platform, projection light source are source of parallel light, face sample stage, light-source brightness is freely adjustable, and optical image unit is solid
It is scheduled on the opposite side of projection light source, for shooting the image or video of solid sample and drop on sample stage, image processing terminal
For automatically extracting image data when appearance profile and the dynamometry probe deformation of drop for image and video, and calculate drop
In the deformation quantity that the contact angle and dynamometry of the surface of solids are popped one's head in, drop is calculated in the frictional force of the surface of solids.
8. device of the measurement drop in surface of solids frictional force as claimed in claim 7, it is characterised in that: described image captures system
The optical image unit of system has fluorescence detection channel, for shooting the image or video of drop internal fluorescent tracing particle.
9. a kind of measure drop in the method for surface of solids frictional force using device described in claim 3 or 7, feature exists
In, comprising the following steps:
Solid sample to be tested is fixed on sample stage by step 1, is passed through drop to be tested using Liquid sample introduction system
The tubular elastomer of dynamometry probe is loaded into solid sample surface, and dynamometry probe is inserted into drop internal；
Along direction of primary motion and dynamometry probe relative motion occurs for step 2, starting kinetic control system, driving sample stage, together
Shi Qidong image capture system shoots dynamometry probe and Liquid particle image in motion process, until drop fortune opposite with solid sample
It moves to setting position or set distance；
Step 3, the frictional force size are calculated by formula F=K*D, wherein F is frictional force of the drop in the surface of solids, and K is to survey
The coefficient of elasticity of power probe, D are the horizontal distance of dynamometry probe end relative initial position offset, and frictional force can be by Image Acquisition
Integrated software automatic measurement & calculation or artificial measuring and calculating built in unit.
10. it is a kind of using device observed drop according to any one of claims 8 in the method for surface of solids motion state, feature exists
In, comprising the following steps:
Solid sample to be tested is fixed on sample stage by step 1, and fluorescence micro-nano particle is added simultaneously in liquid to be tested
It is uniformly dispersed, solid sample surface will be loaded containing the drop of fluorescence micro-nano particle using Liquid sample introduction system, and dynamometry is visited
Head is inserted into drop internal；
Step 2, starting kinetic control system, driving sample stage and dynamometry pop one's head in and relative motion occur along direction of primary motion, together
Shi Qidong image capture system shoots Liquid particle image and video in motion process, shoots fluorescence micro-nano by fluorescence detection channel
Movement of the grain in drop；
Step 3, by the motion profile of fluorescence micro-nano particle, judge that interface of drop during solid sample mantle friction is existing
As.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910694783.0A CN110487679B (en) | 2019-07-30 | 2019-07-30 | Device for measuring friction force of liquid drop on solid surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910694783.0A CN110487679B (en) | 2019-07-30 | 2019-07-30 | Device for measuring friction force of liquid drop on solid surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110487679A true CN110487679A (en) | 2019-11-22 |
| CN110487679B CN110487679B (en) | 2021-07-20 |
Family
ID=68547803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910694783.0A Active CN110487679B (en) | 2019-07-30 | 2019-07-30 | Device for measuring friction force of liquid drop on solid surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110487679B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239005A (en) * | 2020-03-12 | 2020-06-05 | 武汉大学 | Test device and method for synchronously measuring liquid-solid interface interaction and liquid-solid contact area |
| CN111239004A (en) * | 2020-03-12 | 2020-06-05 | 武汉大学 | Test device and method for measuring liquid-solid interface action state of transparent fixed sample |
| CN111257172A (en) * | 2019-12-26 | 2020-06-09 | 浙江大学 | Portable device and method for rapidly detecting liquid drop contact angle |
| CN111999033A (en) * | 2020-08-28 | 2020-11-27 | 河南农业大学 | Method for controlling movement track of liquid drop after collision through elastic cantilever beam |
| CN113009186A (en) * | 2021-03-08 | 2021-06-22 | 清华大学 | Visual representation device and method for friction between single cell and engineering interface |
| CN113607604A (en) * | 2020-09-03 | 2021-11-05 | 青岛市资源化学与新材料研究中心（中国科学院兰州化学物理研究所青岛研究发展中心） | Sensor and method for testing solid-liquid interface wettability change |
| CN113740209A (en) * | 2021-09-16 | 2021-12-03 | 哈尔滨工业大学（威海） | Device and method for simulating wetting behavior of plastic on metal surface under specific pressure |
| CN114216402A (en) * | 2021-12-14 | 2022-03-22 | 西南科技大学 | Method and device for measuring soft substrate micro-deformation caused by surface tension |
| CN114923850A (en) * | 2022-05-16 | 2022-08-19 | 西南科技大学 | Method and device for contact type nondestructive detection of surface defects |
| CN115739219A (en) * | 2022-11-23 | 2023-03-07 | 武汉大学 | Duckweed-like liquid drop driver and solid-liquid interface adhesion force measuring method |
| CN116735404A (en) * | 2023-08-12 | 2023-09-12 | 叙镇铁路有限责任公司 | Device for detecting mechanical durability of surface of hydrophobically modified cement-based material |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070217840A1 (en) * | 2006-03-17 | 2007-09-20 | Sharp Kabushiki Kaisha | Image forming apparatus |
| CN101865807A (en) * | 2010-04-15 | 2010-10-20 | 上海梭伦信息科技有限公司 | Apparatus and method for testing solid-liquid dynamic and static contact angles by actual liquid droplet method |
| JP2014092536A (en) * | 2012-11-07 | 2014-05-19 | Kayaba Ind Co Ltd | Fluid sample observation apparatus and fluid sample observation method |
| CN105466813A (en) * | 2015-12-30 | 2016-04-06 | 华南理工大学 | Determination method of contact angle of powder and liquid |
| CN105928836A (en) * | 2016-04-26 | 2016-09-07 | 中山大学 | Method and apparatus for measuring liquid diffusion coefficient of rock stratum based on 3D printing and SPT technology |
| US20170082549A1 (en) * | 2015-09-23 | 2017-03-23 | Ingrain, Inc. | Measurement Of Noble Gas Adsorption Via Laser-Induced Breakdown Spectroscopy For Wettability Determination |
| WO2017119715A1 (en) * | 2016-01-05 | 2017-07-13 | 경기대학교 산학협력단 | Graphene inspection device and method |
| CN106970225A (en) * | 2017-03-16 | 2017-07-21 | 武汉康录生物技术股份有限公司 | A kind of kit of application CD45 immunofluorescences joint probe identification circulating tumor cells of CEP 8 and its application |
| CA2968623A1 (en) * | 2016-06-22 | 2017-12-22 | Guoxing Gu | A multifunctional apparatus for measuring induction time, surface and interfacial properties |
| CN108760234A (en) * | 2018-06-05 | 2018-11-06 | 哈尔滨工程大学 | A kind of fluid flowing and solids movement synchronizing information test method and device based on PIV and PTV technologies |
| CN109269976A (en) * | 2018-11-16 | 2019-01-25 | 西南科技大学 | Measure the measuring device and measuring method of frictional force between solid liquid interface under electric field |
| CN109269978A (en) * | 2018-11-16 | 2019-01-25 | 西南科技大学 | Measure the measuring device and measuring method of adhesion strength between solid liquid interface under electric field |
| CN109307641A (en) * | 2018-10-09 | 2019-02-05 | 巨石集团有限公司 | A method of characterization resin is to glass fibre wetting property |
| CN109781574A (en) * | 2019-03-20 | 2019-05-21 | 中原工学院 | A kind of textile Moisture absorbing & quick drying property process detection device and its application |
-
2019
- 2019-07-30 CN CN201910694783.0A patent/CN110487679B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070217840A1 (en) * | 2006-03-17 | 2007-09-20 | Sharp Kabushiki Kaisha | Image forming apparatus |
| CN101865807A (en) * | 2010-04-15 | 2010-10-20 | 上海梭伦信息科技有限公司 | Apparatus and method for testing solid-liquid dynamic and static contact angles by actual liquid droplet method |
| JP2014092536A (en) * | 2012-11-07 | 2014-05-19 | Kayaba Ind Co Ltd | Fluid sample observation apparatus and fluid sample observation method |
| US20170082549A1 (en) * | 2015-09-23 | 2017-03-23 | Ingrain, Inc. | Measurement Of Noble Gas Adsorption Via Laser-Induced Breakdown Spectroscopy For Wettability Determination |
| CN105466813A (en) * | 2015-12-30 | 2016-04-06 | 华南理工大学 | Determination method of contact angle of powder and liquid |
| WO2017119715A1 (en) * | 2016-01-05 | 2017-07-13 | 경기대학교 산학협력단 | Graphene inspection device and method |
| CN105928836A (en) * | 2016-04-26 | 2016-09-07 | 中山大学 | Method and apparatus for measuring liquid diffusion coefficient of rock stratum based on 3D printing and SPT technology |
| CA2968623A1 (en) * | 2016-06-22 | 2017-12-22 | Guoxing Gu | A multifunctional apparatus for measuring induction time, surface and interfacial properties |
| CN106970225A (en) * | 2017-03-16 | 2017-07-21 | 武汉康录生物技术股份有限公司 | A kind of kit of application CD45 immunofluorescences joint probe identification circulating tumor cells of CEP 8 and its application |
| CN108760234A (en) * | 2018-06-05 | 2018-11-06 | 哈尔滨工程大学 | A kind of fluid flowing and solids movement synchronizing information test method and device based on PIV and PTV technologies |
| CN109307641A (en) * | 2018-10-09 | 2019-02-05 | 巨石集团有限公司 | A method of characterization resin is to glass fibre wetting property |
| CN109269976A (en) * | 2018-11-16 | 2019-01-25 | 西南科技大学 | Measure the measuring device and measuring method of frictional force between solid liquid interface under electric field |
| CN109269978A (en) * | 2018-11-16 | 2019-01-25 | 西南科技大学 | Measure the measuring device and measuring method of adhesion strength between solid liquid interface under electric field |
| CN109781574A (en) * | 2019-03-20 | 2019-05-21 | 中原工学院 | A kind of textile Moisture absorbing & quick drying property process detection device and its application |
Non-Patent Citations (3)
| Title |
|---|
| PONTUS OLIN: "Water drop friction on superhydrophobic surfaces", 《LANGMUIR》 * |
| 尚校森: "波动下液滴运动微观动力学机理研究", 《科学技术与工程》 * |
| 赵学增 等: "《微纳尺度下固液界面流动阻力影响因素的研究》", 30 June 2018 * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257172A (en) * | 2019-12-26 | 2020-06-09 | 浙江大学 | Portable device and method for rapidly detecting liquid drop contact angle |
| CN111239004A (en) * | 2020-03-12 | 2020-06-05 | 武汉大学 | Test device and method for measuring liquid-solid interface action state of transparent fixed sample |
| CN111239005B (en) * | 2020-03-12 | 2021-10-22 | 武汉大学 | Test device and method for synchronously measuring liquid-solid interface interaction and liquid-solid contact area |
| CN111239005A (en) * | 2020-03-12 | 2020-06-05 | 武汉大学 | Test device and method for synchronously measuring liquid-solid interface interaction and liquid-solid contact area |
| CN111999033A (en) * | 2020-08-28 | 2020-11-27 | 河南农业大学 | Method for controlling movement track of liquid drop after collision through elastic cantilever beam |
| CN113607604A (en) * | 2020-09-03 | 2021-11-05 | 青岛市资源化学与新材料研究中心（中国科学院兰州化学物理研究所青岛研究发展中心） | Sensor and method for testing solid-liquid interface wettability change |
| CN113009186A (en) * | 2021-03-08 | 2021-06-22 | 清华大学 | Visual representation device and method for friction between single cell and engineering interface |
| CN113740209B (en) * | 2021-09-16 | 2024-04-05 | 哈尔滨工业大学（威海） | Device and method for simulating wetting behavior of plastic on metal surface under specific pressure |
| CN113740209A (en) * | 2021-09-16 | 2021-12-03 | 哈尔滨工业大学（威海） | Device and method for simulating wetting behavior of plastic on metal surface under specific pressure |
| CN114216402A (en) * | 2021-12-14 | 2022-03-22 | 西南科技大学 | Method and device for measuring soft substrate micro-deformation caused by surface tension |
| CN114216402B (en) * | 2021-12-14 | 2023-09-22 | 西南科技大学 | Method and device for measuring micro deformation of soft substrate caused by surface tension |
| CN114923850A (en) * | 2022-05-16 | 2022-08-19 | 西南科技大学 | Method and device for contact type nondestructive detection of surface defects |
| CN115739219A (en) * | 2022-11-23 | 2023-03-07 | 武汉大学 | Duckweed-like liquid drop driver and solid-liquid interface adhesion force measuring method |
| CN115739219B (en) * | 2022-11-23 | 2024-04-19 | 武汉大学 | Duckweed-like droplet driver and solid-liquid interface adhesion force measuring method |
| CN116735404A (en) * | 2023-08-12 | 2023-09-12 | 叙镇铁路有限责任公司 | Device for detecting mechanical durability of surface of hydrophobically modified cement-based material |
| CN116735404B (en) * | 2023-08-12 | 2023-11-10 | 叙镇铁路有限责任公司 | Device for detecting mechanical durability of surface of hydrophobically modified cement-based material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110487679B (en) | 2021-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110487679A (en) | It is a kind of measurement drop surface of solids frictional force device | |
| CN111239005B (en) | Test device and method for synchronously measuring liquid-solid interface interaction and liquid-solid contact area | |
| CN202195997U (en) | Interface flowing deformation testing device through adopting liquid drop image method | |
| CN109269978A (en) | Measure the measuring device and measuring method of adhesion strength between solid liquid interface under electric field | |
| CN110470595B (en) | Material surface icing strength on-line measuring device and icing process real-time monitoring system | |
| CN104596898A (en) | Micro-bubble dimension online measurement apparatus and method thereof | |
| CN105865979B (en) | A kind of apparatus and method measuring microlayer model electrowetting | |
| JP5692361B2 (en) | Spray inspection equipment | |
| CN215866742U (en) | Full-automatic sample point appearance | |
| CN114460125B (en) | Experimental device and method for solidifying supercooled liquid drops on metal surface | |
| CN207923676U (en) | A kind of haemocyte shear stress rheology observation device | |
| CN108398371A (en) | A kind of reproducting method of the analysis and Rheologic of haemocyte shear stress rheology observation device and haemocyte shear stress Rheological Regularity | |
| CN103344565A (en) | Temperature-controlled magnetic tweezer device | |
| CN111239004A (en) | Test device and method for measuring liquid-solid interface action state of transparent fixed sample | |
| Wei et al. | In situ dark field microscopy for on-line monitoring of yeast cultures | |
| CN102564905A (en) | Contact angle measurement device and method for superconducting magnet simulated microgravity environment | |
| CN202486019U (en) | Contact angle measuring device under simulated microgravity environment of superconducting magnet | |
| CN106959258B (en) | A kind of micro-force measuring apparatus and its measurement method | |
| CN109142675B (en) | Micron capillary gas-liquid dynamic phase interface testing device | |
| Li et al. | Study on the shear stress and interfacial friction of droplets moving on a superhydrophobic surface | |
| CN112986109A (en) | Instrument for counting eosinophilic granulocytes in induced sputum | |
| CN208594301U (en) | Digital pcr detector | |
| CN113030157A (en) | Detection apparatus and system for nucleation of atmospheric ice nucleus | |
| CN109030347B (en) | Integrated surface freeze-adhesion detection experimental equipment | |
| CN113063786A (en) | Urine visible component analyzer based on micro-nano fluidic chip and use method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |