Self-assembled model and preparation method thereof, and self-assembly method of light-adjustable friction coefficient film

A self-assembled film and friction coefficient technology, applied in the field of tribology, can solve problems such as irreversibility, and achieve the effect of improving cognition, wide application range and good fatigue resistance

Active Publication Date: 2020-05-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to address the irreversibility of traditional chemical self-assembled films, provide a self-assembled model and its preparation method, and a self-assembled method for optically adjustable friction coefficient films

Method used

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  • Self-assembled model and preparation method thereof, and self-assembly method of light-adjustable friction coefficient film
  • Self-assembled model and preparation method thereof, and self-assembly method of light-adjustable friction coefficient film
  • Self-assembled model and preparation method thereof, and self-assembly method of light-adjustable friction coefficient film

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preparation example Construction

[0040] see figure 1 , an embodiment of the present invention provides a method for preparing a self-assembly model, including:

[0041] S120, providing an organic photoisomerization molecule solution, including a solvent and organic photoisomerization molecules dissolved in the solvent, the organic photoisomerization molecules can be transform into a first structure, and can transform into a second structure under the irradiation of visible light in a second wavelength range, and the organic photoisomerization molecules have different coefficient of friction;

[0042] S140, adding the organic photoisomerization molecule solution dropwise to the surface of the highly oriented pyrolytic graphite substrate; and

[0043] S160, standing still until the solvent in the organic photoisomerization molecular solution is volatilized, so that the organic photoisomerization molecular solution self-assembles on the highly oriented pyrolytic graphite substrate to form a self-assembled film...

Embodiment

[0075] (1) An organic solution of the organic photoisomerization molecule azobenzene tetracarboxylate is prepared. The solvent is heptanoic acid, and the concentration in the solution is 5×10 -5 M.

[0076] (2) Generation of self-assembled membranes. Conductive highly oriented pyrolytic graphite (HOPG) was chosen as the substrate. Use a pipette gun to take 0.1 μl of the prepared azobenzene tetracarboxylate solution on the clean and flat surface of the highly oriented pyrolytic graphite HOPG substrate. The solvent in the azobenzene tetracarboxylate solution left to stand on the substrate volatilizes, and the azobenzene tetracarboxylate forms a monomolecular self-assembled film on the substrate to prepare a self-assembly model. The intermolecular interactions are driven by non-covalent hydrogen bonds.

[0077] (3) Morphological characterization of the self-assembled film. Please refer to 10, using scanning tunneling microscope STM scanning topography to characterize the sur...

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Abstract

The invention discloses a preparation method of a self-assembled model. The method comprises the following steps: providing an organic photoisomerization molecular solution, the organic photoisomerization catalyst comprising a solvent and organic photoisomerization molecules dissolved in the solvent, wherein the organic photoisomerization molecules can be converted into a first structure under theirradiation of ultraviolet light in a first wavelength range and can be converted into a second structure under the irradiation of visible light in a second wavelength range, and the organic photoisomerization molecules having different friction coefficients when being located in the first structure and the second structure respectively; dropwise adding the organic photoisomerization molecular solution to the surface of a highly-oriented pyrolytic graphite substrate; and standing until the solvent in the organic photoisomerization molecular solution is volatilized, so that the organic photoisomerization molecular solution is self-assembled on the highly-oriented pyrolytic graphite substrate to form a self-assembled film. The invention further discloses a self-assembly model. The inventionfurther discloses a self-assembly method of the film with the friction coefficient capable of being adjusted and controlled through light.

Description

technical field [0001] The invention relates to the technical field of tribology, in particular to a self-assembly model and a preparation method thereof, and a self-assembly method of a light-adjustable friction coefficient film. Background technique [0002] Exploring friction control methods has always been a topic that has attracted much attention. In essence, it can be said that friction phenomena include macroscopic and microscopic. The macroscopic friction phenomenon is the result of the interaction between surface molecules, but it is not applicable to the field of micro-nano scale, so there are great limitations. It can be seen that the study of nanotribology is very important to explore the nature of nanoscale friction. Moreover, due to the limitations of the understanding of the nature of friction, the theory is not perfect. From this point of view, the coupling relationship between the surface interface structure and friction performance needs to be further stu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02G01Q60/10G01Q60/24
CPCG01N19/02G01Q60/10G01Q60/24
Inventor 马丽然薛单单温诗铸雒建斌
Owner TSINGHUA UNIV
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