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Method for performing single molecule force spectrum test in gas phase environment

A single-molecule force spectroscopy, environmental technology, applied in the field of single-molecule force spectroscopy, can solve the problem of polymer single-chain properties, mechanical response behavior and kinetic parameters. High-performance polymer materials, single-molecule force spectroscopy application range and significance Restrictions and other problems, to achieve the effect of improving sensitivity and accuracy, convenient operation, and simple device structure

Pending Publication Date: 2018-07-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such polymer single-chain properties, mechanical response behavior and kinetic parameters obtained in the liquid phase cannot be directly used to design high-performance polymer materials used in non-liquid phase environments.
Therefore, the application range and significance of single-molecule force spectroscopy are restricted and have great limitations.

Method used

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  • Method for performing single molecule force spectrum test in gas phase environment
  • Method for performing single molecule force spectrum test in gas phase environment
  • Method for performing single molecule force spectrum test in gas phase environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 Study on force-induced melting and melting of polyoxyethylene single crystal

[0059] Sample 6 is a polyoxyethylene (PEO) single crystal obtained from the seed crystal method in the solution phase, the substrate 7 is an amide silicon substrate, and sample 6 is adsorbed on the substrate 7 by physical action; the elastic coefficient of AFM probe 3 is 0.2N / m; the material of the rubber cover 4 is fluorine rubber; the gas is nitrogen; the relative humidity is 11%.

[0060] The test process is as follows: the substrate 7 carrying the sample 6 is placed on the stage 5, and the position of the sample 6 is determined through the imaging mode of the atomic force microscope, such as figure 2 As shown, the atomic force microscope is then switched to the force spectrum mode, and the AFM probe 3 approaches the substrate 7 at a rate of 20nm / s-100μm / s. 3 contacts with PEO molecules to form a bridging structure, and then the scanner 11 shrinks, making the AFM probe 3 move ...

Embodiment 2

[0062] The research of single-chain motion in embodiment 2 polystyrene condensed matter

[0063] Sample 6 is a polystyrene (PS) ultra-thin film prepared on a hydroxylated silicon substrate by spin coating; the elastic coefficient of the AFM probe 3 is 0.02N / m~0.7N / m; the material of the rubber cover 4 is fluororubber; The gas introduced is nitrogen; the relative humidity is 11% to 40%.

[0064] The test process is as follows: first, then place the substrate 7 carrying the sample 6 on the stage 5, switch the atomic force microscope to the force spectrum mode, and drive the AFM probe 3 to move through the extension of the scanner 11, so that the AFM probe 3 moves at a distance of 2 μm The rate of / s approaches the substrate 7, and after contacting the substrate 7, stay for 3s with a downward pressure of 10nN, so that the AFM probe 3 contacts with the PS molecule to form a bridge structure, and then the scanner 11 shrinks, so that the AFM probe 3 moves at a speed of 2 μm / The sp...

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Abstract

The invention discloses a method for performing a single molecule force spectrum test in a gas phase environment, and belongs to the technical field of single molecule force spectrum measurement. Theinvention solves the problem of how to perform single molecule force spectrum detection in a gas phase environment. The test method of the invention is to first place a substrate carrying a sample ona stage, adjust the relative humidity of an AFM probe of an atomic force microscope and the environment of the sample to be less than 20%, then drive the probe to move by the expansion and contractionof a scanner, and finally, obtain a force-distance curve by parameters of a laser detector and the scanner, so as to obtain a mechanical signal of a polymer molecule in the gas phase environment. Themethod can be used for the study of the process and mechanism of single-chain force-induced fusing and melting of polymer lamellar crystal in the gas phase environment and the single-chain behavior and mechanical response of polymer molecules in the gas phase environment, and the method can adjust the stretching speed of the single molecular chain of the polymer to from tens of nanometers per second to hundreds of micrometers per second, with the resulting force-distance curve having a force accuracy of 5 pico-Newtons.

Description

technical field [0001] The invention belongs to the technical field of single-molecule force spectrum measurement, and in particular relates to a method for performing single-molecule force spectrum test in a gas phase environment. Background technique [0002] Today, polymer semi-crystalline materials are widely used in human society. Polymeric semicrystalline materials consist of an interconnected network of crystalline and amorphous phases (Phys. Rev. Lett. 2003, 91, 095502). In the crystalline phase, there are a large number of lamellae with a thickness of nanometer scale, and these lamellae have a decisive effect on the mechanical properties of polymer semi-crystalline materials (Macromolecules 1999, 32, 4390-4403). It is very important to understand the molecular behavior and molecular mechanism of lamellae under force deformation for the design of high-performance polymer semi-crystalline materials. However, limited by the size of the lamellae, the behavior of a sin...

Claims

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Application Information

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IPC IPC(8): G01Q60/24
CPCG01Q60/24
Inventor 张文科杨鹏宋宇
Owner JILIN UNIV
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