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Device for measuring friction of liquid drop on 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: 2019-11-22
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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  • Device for measuring friction of liquid drop on solid surface
  • Device for measuring friction of liquid drop on solid surface
  • Device for measuring friction of liquid drop on 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 friction force of liquid drops on a solid surface. The device comprises a sample table, an image capture system, a force measuring probe and a motion control system for driving the sample table and the force measuring probe to generate at least one-dimensional relative motion, wherein the sample table is used for fixing a solid sample to be tested; aliquid drop to be tested is placed on the solid sample; the force measuring probe is mounted above the liquid drop through a probe bracket; the force measuring probe comprises an elastic part and a combination part located at the tail end of the elastic part. During testing, the combination part extends into the liquid drop to increase the binding force of the liquid drop and the force measuring probe, the elastic part is a tubular elastic body and is used for generating elastic deformation when the force measuring probe and the sample table generate relative movement, and the image capture system is used for capturing images and videos generated when the force measuring probe inserted into the liquid drop and the sample table generate relative movement. The device can accurately measure the friction force of liquid drops on the solid surface, and is simple in structure, high in efficiency and low in 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 Applications(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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