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Title: Thermocapillary marangoni flows in Azopolymers
Authors: Miniewicz, Andrzej
Sobolewska, Anna
Piotrowski, Wojciech
Karpiński, Paweł
Bartkiewicz, Stanisław
Schab-Balcerzak, Ewa
Keywords: azobenzene derivatives; photochromic polymers; light-induced polymer mass movement; optofluidization process; relief formation; thermocapillary Marangoni effect
Issue Date: 2020
Citation: "Materials" 2020, iss. 11, art. no. 2464
Abstract: It is well known that light-induced multiple trans-cis-trans photoisomerizations of azobenzene derivatives attached to various matrices (polymeric, liquid crystalline polymers) result in polymer mass movement leading to generation of surface reliefs. The reliefs can be produced at small as well as at large light intensities. When linearly polarized light is used in the process, directional photo-induced molecular orientation of the azo molecules occurs, which leads to the generation of optical anisotropy in the system, providing that thermal effects are negligible. On the other hand, large reliefs are observed at relatively strong laser intensities when the optofluidization process is particularly effective. In this article, we describe the competitive thermocapillary Marangoni effect of polymer mass motion. We experimentally prove that the Marangoni effect occurs simultaneously with the optofluidization process. It destroys the orientation of the azopolymer molecules and results in cancelation of the photo-induced birefringence. Our experimental observations of polymer surface topography with atomic force microscopy are supported by suitable modelings.
DOI: 10.3390/ma13112464
ISSN: 1996-1944
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