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
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[0058] Example 1 Study on force-induced melting melting of polyoxyethylene single crystal
[0059] The sample 6 is a polyoxyethylene (PEO) single crystal obtained from the solution phase by the seed crystal method, the substrate 7 is a silicon amide substrate, and the sample 6 is adsorbed on the substrate 7 by physical action; the elastic coefficient of the AFM probe 3 is 0.2N / m; the material of the rubber cover 4 is fluorine rubber; the inlet gas is nitrogen; the relative humidity is 11%.
[0060] The test process is as follows: the substrate 7 carrying the sample 6 is set on the stage 5, and the position of the sample 6 is determined by the imaging mode of the atomic force microscope, such as figure 2 Then, the atomic force microscope was changed to force spectroscopy mode, and the AFM probe 3 approached the substrate 7 at a rate of 20 nm / s to 100 μm / s. After contacting the substrate 7, it stayed for 0.1 s at a pressure of 1 nN, so that the AFM probe 3 3 Contact with PEO ...
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[0062] Example 2 Study on single chain motion in polystyrene condensed state
[0063] Sample 6 is a polystyrene (PS) ultra-thin film prepared on a hydroxylated silicon substrate by spin coating; the elastic coefficient of AFM probe 3 is 0.02N / m-0.7N / m; the material of rubber cover 4 is fluororubber; The incoming gas is nitrogen; the relative humidity is 11% to 40%.
[0064] The test process is as follows: first and then place the substrate 7 carrying the sample 6 on the stage 5, adjust 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 is 2 μm The rate of / s approached the substrate 7, and after contacting the substrate 7, it stayed for 3 s with a downward pressure of 10 nN, so that the AFM probe 3 was in contact with the PS molecule to form a bridge structure, and then the scanner 11 contracted, so that the AFM probe 3 was 2 μm / The velocity of s moves away from the substr...
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