A method for measuring light softening of an azobenzene thin film through utilization of surface wrinkling

A light softening and azobenzene technology, which is applied in the field of mechanical performance testing of azobenzene films, can solve the problems of large differences in measurement results, and achieve the effect of simple operation, good repeatability and accurate measurement

Inactive Publication Date: 2016-06-22
TIANJIN UNIV
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Problems solved by technology

The use of nanoprobes to measure the elastic modulus of materials requires the establishment of a strict mechanical model, and the selection of the model often leads to large differences in measurement results.

Method used

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  • A method for measuring light softening of an azobenzene thin film through utilization of surface wrinkling
  • A method for measuring light softening of an azobenzene thin film through utilization of surface wrinkling
  • A method for measuring light softening of an azobenzene thin film through utilization of surface wrinkling

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Embodiment Construction

[0017] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

[0018] A kind of method that utilizes surface wrinkle to measure light softening of azobenzene film that the present invention proposes comprises the following steps:

[0019] (1) After mixing the PDMS prepolymer and cross-linking agent at a mass ratio of 10:1, stir fully to form a uniform prepolymer, degas the prepolymer in a vacuum pump, pour it into a petri dish, and heat it at 80°C Heating to crosslink.

[0020] (2) Fix the PDMS elastomer obtained by crosslinking in step (1) on the stretching platform, and stretch according to the pre-stretch ratio of 5%;

[0021] (3) Spin-coat a tetrahydrofuran solution with a mass fraction of 2wt% PAzo on a clean glass substrate, he...

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Abstract

The invention discloses a method for measuring light softening of an azobenzene thin film through utilization of surface wrinkling. Through utilization of surface wrinkling technology, a light softening effect, i.e. photoinduced elastic modulus reduction, of the azobenzene thin film is simply and conveniently measured through utilization of the surface wrinkling technology. Firstly, a tetrahydrofuran solution of an azobenzene polymer (PAzo) is coated in a spinning mode on a clean glass substrate. In a water-bath environment, the PAzo thin film is transferred to a stretched polydimethylsiloxane (PDMS) substrate to form a PDMS/PAzo soft and hard composite system. Retraction of the stretched polydimethylsiloxane (PDMS) is conducted under an illumination effect. Through control of irradiation light intensity, formation of wrinkles of a PDMS/PAzo double layer system can be regulated and controlled. Through measurement of a wrinkle period and the thickness of the PAzo film, an elastic modulus of the PAzo thin film can be obtained through calculating. The method is simple to operate and good in repeatability, avoids usage of complex and expensive apparatuses and tedious and complex theoretical simulation, and has a broad application prospect in tests of azobenzene thin film light softening.

Description

technical field [0001] The invention relates to a mechanical performance test of an azobenzene film, in particular to a surface wrinkling test for the light softening of an azobenzene film, that is, the reduction of the photoelastic modulus. Background technique [0002] Azobenzene has attracted widespread attention because of its unique photoresponsiveness. Among them, photoinduced mass transfer has been developed as a method to fabricate surface gratings. Under the irradiation of interference polarized light, the photo-induced cis-trans isomerization of the azobenzene group will lead to the macroscopic mass migration of the molecules on the surface of the azobenzene film. There have been many studies on the mechanism of mass transfer, but no unified conclusion has been obtained. Among them, the photosoftening theory believes that the progress of photoinduced cis-trans isomerization can reduce the modulus of the azobenzene film, increase the fluidity, and then cause macro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01Q60/24
CPCG01Q60/24
Inventor 鲁从华姬海鹏
Owner TIANJIN UNIV
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