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A device for measuring the frictional force of droplets on a solid surface

A solid surface and friction technology, applied in the field of interface friction devices and devices for measuring the friction of liquid droplets on solid surfaces, can solve the problems of experimental errors, large influence of droplet size, and low measurement accuracy, and achieve simple structure , The test process is convenient, and the effect of promoting mechanism research

Active Publication Date: 2021-07-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inclined plate device calculates the friction force of the liquid drop on the solid surface by observing the movement law of the liquid drop on the inclined plate under the action of gravity. Although this method is simple to operate, the measurement accuracy is low and is greatly affected by the size of the liquid droplet.
In addition, atomic force microscopes and surface instruments are precision instruments, which have extremely high requirements on the experimental environment, experimental personnel, experimental process and test samples in the process of measuring friction, and small changes will cause great experimental errors

Method used

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  • A device for measuring the frictional force of droplets on a solid surface
  • A device for measuring the frictional force of droplets on a solid surface
  • A device for measuring the frictional force of droplets on a solid surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A device for measuring the frictional force of droplets on a solid surface as described above is used to test the frictional force between ultrapure water droplets 11 and a polydimethylsiloxane sample with a micron groove structure, comprising the following steps:

[0057] Step 1: Fix the solid sample 12 with a micron groove structure on the surface on the sample stage 4, the groove width of the groove structure is 50 microns, the groove pitch is 50 microns, and the groove height is 30 microns.

[0058] Step 2: Adjust the sample table 4 to the right below the needle tube 14 through the Y-direction screw nut linear slide 3 and the X-direction screw nut linear slide 2 of the three-dimensional mobile platform, and adjust the needle tube 14 to be close to the solid sample 12 through the lifting adjustment mechanism 6 At the center of the surface, the plunger of the injector is pushed through the control of the electric push rod, and 4 μL of droplet 11 is injected to the surf...

Embodiment 2

[0063] A device for measuring the frictional force of droplets on a solid surface as described above is used to test the frictional force between ultrapure water droplets and a copper oxide sample having a micron cone columnar array structure, comprising the following steps:

[0064] Step 1: Fix the solid sample 12 on the sample stage 4, the surface of the solid sample 12 has a conical array structure, the diameter of the bottom of the cone is 30 microns, and the height is 35 microns.

[0065] Step 2: Adjust the sample table 4 to the needle tube 14 through the Y-direction screw nut linear slide 3 and the X-direction screw nut linear slide 2 of the three-dimensional mobile platform, and adjust the needle tube 14 to the center of the surface of the solid sample 12 through the lifting adjustment mechanism 6 position, the piston rod of the injector is controlled by the electric push rod, and the 8 μL droplet 11 is injected to the surface of the solid sample 12 through the needle tu...

Embodiment 3

[0070] A device for measuring the frictional force of droplets on a solid surface is used to test the frictional force between ethylene glycol droplets and polydimethylsiloxane samples with a micron circular columnar array structure, comprising the following steps:

[0071] Step 1: Fix the solid sample 12 on the sample stage 4, the surface of the solid sample 12 has a cylindrical array structure, the diameter of the cylinder is 30 microns, and the height is 35 microns.

[0072] Step 2: Adjust the sample table 4 to the needle tube 14 through the Y-direction screw nut linear slide 3 and the X-direction screw nut linear slide 2 of the three-dimensional mobile platform, and adjust the needle tube 14 to the center of the surface of the solid sample 12 through the lifting adjustment mechanism 6 The position is controlled by the control software to push the piston rod of the sample injector, and inject 6 μL of droplet 11 to the surface of the solid sample 12 through the needle tube 14...

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Abstract

The invention discloses a device for measuring the frictional force of a liquid drop on a solid surface, which includes a sample stage, an image capture system, a force-measuring probe, and a motion control system that drives the sample stage and the force-measuring probe to undergo at least one-dimensional relative motion. The stage is used to fix the solid sample to be tested, and the liquid drop to be tested is placed on the solid sample. The force measuring probe is installed above the liquid drop through the probe bracket. During the test, the joint part extends into the droplet to increase the binding force between the droplet and the force measuring probe, and the elastic part is a tubular elastic body, which is used when the force measuring probe and the sample stage move Elastic deformation occurs, and the image capture system is used to capture images and videos of the force measuring probe inserted into the liquid drop when it moves relative to the sample stage. The device can accurately measure the frictional force of the liquid drop on the solid surface, and has the advantages of simple structure, high efficiency and low cost.

Description

technical field [0001] The invention belongs to the field of interface analysis and testing, and relates to an interface friction device, in particular to a device for measuring the friction force of a liquid drop on a solid surface. Background technique [0002] Solid-liquid interface behavior is ubiquitous in our lives, and liquid droplets exhibit different wetting behaviors on different materials or structural surfaces. The low-adhesion superhydrophobic surface represented by "lotus leaf" and the high-adhesion superhydrophobic surface represented by "red rose" have attracted the attention of many researchers. These two different solid-liquid interface behaviors are widely used in people's daily life and Industrial production has extremely broad application prospects. [0003] Due to the small adhesion between the low-adhesion superhydrophobic surface and the droplet, the droplet has a small friction force with the superhydrophobic surface, and the droplet is easy to roll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 薛龙建石奎李利军李倩汪鑫谭迪张国栋
Owner WUHAN UNIV
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