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Preparation method of full-light-control azobenzene thin film surface reversible wrinkle microstructure

A technology of optically controlling azobenzene and azobenzene, which is applied in the field of smart surface preparation to achieve the effect of easy operation

Inactive Publication Date: 2018-12-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the intelligent regulation of reversible wrinkle microstructure using light as an external stimulus.

Method used

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  • Preparation method of full-light-control azobenzene thin film surface reversible wrinkle microstructure
  • Preparation method of full-light-control azobenzene thin film surface reversible wrinkle microstructure
  • Preparation method of full-light-control azobenzene thin film surface reversible wrinkle microstructure

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method for preparing a reversible wrinkle microstructure on the surface of an all-optical control azobenzene film, comprising the following steps:

[0026] Step 1, mix the PDMS prepolymer and crosslinking agent Sylgard 184 (purchased from Dow Corning, USA) at a mass ratio of 10:1, and fully stir with a glass rod to form a uniform prepolymer; put the above prepolymer in circulating water After degassing in a multi-purpose vacuum pump for 1 hour, pour it into a watch glass; heat it at 70°C for 4 hours to cure; obtain a PDMS soft substrate;

[0027] Step 2. The PDMS soft substrate obtained in step 1 is subjected to oxygen plasma surface activation treatment, and then spin-coated with 2wt% PDO 3 THF solution (spin-coating parameters: 3000rpm, 40s), degassed in a vacuum pump to remove residual organic solvents, to obtain PDMS / PDO 3 Soft and hard composite system.

[0028] Step 3, the PDMS / PDO obtained in step 2 3 Composite system at 2.46W / cm 2 450nm laser irradiation f...

Embodiment 2

[0032] A method for preparing a reversible wrinkle microstructure on the surface of an all-optical control azobenzene film, the preparation process of which is basically the same as in Example 1, except that the 2.46W / cm 2 450nm laser irradiation 5s changed to 410mW / cm -2 Irradiated under white light for 60s, a maze-like surface wrinkle pattern is obtained, such as Figure 5 As shown in the light microscope diagram; 45mW / cm in step 4 2 450nm laser irradiation 10s changed to 15mW / cm -2 Irradiate under white light for 120s to regain a smooth azobenzene film, such as Image 6 shown in the light microscope diagram. In step 5, the number of repeated wrinkling / wrinkling is changed from 20 times to 10 times, and the surface wrinkle pattern obtained in step 3 for the 10th time is as follows: Figure 7 As shown in the light microscope image, the wrinkle-free pattern on the surface obtained in step 4 for the 10th time is as follows Figure 8 shown in the light microscope diagram. ...

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Abstract

The invention discloses a preparation method of a full-light-control azobenzene thin film surface reversible wrinkle microstructure. The method comprises the steps of mixing a PDMS prepolymer and a cross-linking agent according to the mass ratio being 10:1, fully stirring to form a uniform prepolymer, degassing the prepolymer in a vacuum pump, casting into watch glass, heating for 4h at 70 DEG C,and carrying out cross-linking and curing to obtain a PDMS elastomer; carrying out oxygen plasma surface active treatment on the PDMS elastomer, then spin-coating a tetrahydrofuran solution with PDO3with the mass fraction being 2 percent by weight, degassing in the vacuum pump, removing a residual organic solvent, and obtaining a PDMS / PDO3 soft-hard composite system; then irradiating through high-light-intensity visible light, and obtaining an azobenzene thin film with the surface wrinkling; then irradiating through low-light-intensity visible light, and gradually disappearing wrinkles so asto obtain an azobenzene thin film with the smooth surface; repetitively wrinkling / eliminating wrinkles for 10 to 20 times circularly. The method provided by the invention is clean and efficient, and the use of expensive instruments and the complicated operation step are avoided.

Description

technical field [0001] The invention relates to the preparation and research of an intelligent surface, in particular to a preparation method for a reversible wrinkle microstructure on the surface of an all-optical control azobenzene film. Background technique [0002] Surface wrinkling, as a spontaneous process of forming surface microstructures to adapt to changes in the system's stress field, has attracted particularly intense research interest from researchers in recent years. The appearance of wrinkling is considered to be a manifestation of stress instability. Making full use of the new enlightenment brought by the film wrinkling mechanism to actively promote the wrinkling of the material surface, and to seek its potential applications in the characterization of material properties, micro-nano structure construction and flexible devices, is one of the current research focuses on surface wrinkling. one. Among them, actively exploring the application of environmental s...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/00C08L83/04
CPCC08J7/00C08J7/12C08J7/123C08J2383/04
Inventor 鲁从华汪娟娟
Owner TIANJIN UNIV
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