Method for measuring surface adhesive capacity and elastic modulus of soft material

A technology of elastic modulus and measurement method, applied in the direction of measurement device, analysis material, surface/boundary effect, etc. Large volume and other problems, to achieve the effect of a wide range of test materials, good stability and repeatability, and small sample volume

Inactive Publication Date: 2012-12-12
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first method is limited to measurements on low modulus fluid substances and cannot characterize higher modulus elastomers or soft substances and cannot measure material surface adhesion
The second type cannot characterize the elastic modulus of the material, the test is destructive and the required sample size is large

Method used

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  • Method for measuring surface adhesive capacity and elastic modulus of soft material
  • Method for measuring surface adhesive capacity and elastic modulus of soft material
  • Method for measuring surface adhesive capacity and elastic modulus of soft material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The measurement of the force-displacement curve of embodiment 1 gel

[0038] figure 1 (a) is a schematic diagram of the geometric dimensions of the elastic probe. The radius of the spherical surface is R, the radius of the bottom surface is r, and the height is h. The elastic probe fixed on the rigid tray is in contact with the rigid substrate. The radius of the contact surface is a, and it is perpendicular to the substrate direction produces deformation δ; (b) is a schematic diagram of a medium-rigid probe, in which the rigid probe presses down on the elastic film attached to the rigid substrate, and the amount of pressure perpendicular to the substrate is δ. like figure 1 As shown in (b), a round self-made gel with a thickness h of 4 mm and a radius of 10 mm is glued to the glass slide with 502 glue. 3 ± 0.001mm stainless steel ball, the pressing distance δ is 50 microns, and then leave the steel ball at the same speed until it is completely detached. figure 2 is ...

Embodiment 2

[0039] Example 2 The measurement of the three cyclic force-displacement curves of the gel

[0040] same as figure 1 As shown in (b), a round self-made gel with a thickness h of 4mm and a radius of 10mm is glued to the glass slide with 502 glue, and the radius R is 3±0.001 under the control of the stepper motor at a speed of 10 microns / second mm stainless steel ball, the pressing distance δ is 50 microns, and then leave the steel ball at the same speed until it is completely separated, and repeat the above process to obtain the results of three cycle measurements. image 3 is the cyclic force-displacement curve of the gel. As shown in the figure, O1, O2, and O3 are the tension points 0 in the 1st, 2nd, and 3rd tests respectively. The viscous deformation of the material can be analyzed from the positions of the three points. There is a large distance between O2 and O1. In the second test, the material experienced obvious viscous deformation, and the positions of O3 and O2 were...

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Abstract

The invention discloses a method for measuring the surface adhesive capacity and an elastic modulus of a soft material, the method comprises the following specific steps of: (1) preparing a sample and selecting a probe according the physical property and the chemical property of a tested sample; (2) controlling a horizontal substrate and the spherical probe to move oppositely to be contacted and separated at a constant speed; (3) measuring an interaction force P, a relative displacement delta and a contact radius a respectively by using a pressure sensor, a displacement sensor and an optical microscope in the whole process of the step (2) when the substrate and the probe are contacted with each other; (4) frequently repeating the steps (2) and (3) under the control of software; and (5) quantitatively analyzing the adhesive capacity and the elastic performance of the tested material by using data obtained in the step (3) according to a jabatan kerja raya (JKR) theory. The measurement method has giant application potential in the aspects of scientific research on soft materials such as high-molecule elastic body, biogel and the like, product quality control in industrial manufacturing processes and the like.

Description

technical field [0001] The invention relates to a method for measuring surface adhesion energy and elastic modulus of soft matter materials. Background technique [0002] The measurement of the surface viscoelasticity of soft materials such as polymer elastomers and biogels has been an important research area. When two objects are in contact, there will be an adhesive force. For a rigid object, the influence of the adhesive force can be ignored because it is not easy to deform. For a soft material with a low elastic modulus, it is usually easy to be deformed by an external force. At this time The adhesion force will become very important, and its accurate measurement will become very important. [0003] The JKR theory (K. L. Johnson, K. Kendall, A. D. Roberts, Proc. R. Soc. London A, 1971 the 324th volume 301-313 pages) that Johnson, Kendall and Roberts elaborated in 1971 was used in the present invention, and quantitative describes the balance between the adhesive force a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00G01N3/00
Inventor 李莉郭旭虹黄世斌杜伟应耀国张锐房鼎业
Owner EAST CHINA UNIV OF SCI & TECH
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