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Laser-induced formation of “craters” and “hills” in azobenzene-containing polymethacrylate films

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Abstract

Functional organic polymer materials with an ability to change their surface topography in response to external contactless stimuli, like light irradiation, have attracted considerable attention. This work is devoted to the study of contactless control of the surface topography and the formation of the surface features in the amorphousized and liquid crystalline films of two azobenzene-containing polymers. The investigated polymers are side-chain polymethacrylates containing azobenzene chromophores with two lateral methyl substituents in ortho-positions and differing in the length of flexible spacer with six and ten methylene units. Two lateral methyl substituents at the azobenzene chromophore ensure high photoresponses of these polymeric samples in the whole visible spectral range. Irradiation of the polymethacrylate films by focused polarized light of green (532 nm) and red (633 nm) lasers induces a specific photodeformation of the film surface. In the case of the green light formation of circular “craters” with anisotropic borders was found, whereas for the red light highly asymmetric “hills” were observed. The possible mechanisms of the surface topography formation and their features are discussed.

Graphical abstract: Laser-induced formation of “craters” and “hills” in azobenzene-containing polymethacrylate films

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Article information


Submitted
05 Apr 2020
Accepted
10 May 2020
First published
12 May 2020

Soft Matter, 2020, Advance Article
Article type
Paper

Laser-induced formation of “craters” and “hills” in azobenzene-containing polymethacrylate films

A. Bobrovsky, K. Mochalov, D. Solovyeva, V. Shibaev, M. Cigl, V. Hamplová and A. Bubnov, Soft Matter, 2020, Advance Article , DOI: 10.1039/D0SM00601G

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