Reverse switching of surface roughness in a self-organized polydomain liquid crystal coating

Proceedings of the National Academy of Sciences of the United States of America
Danqing LiuDirk J Broer

Abstract

In this work we propose randomly ordered polydomain nematic liquid crystal polymer networks to reversibly generate notable jagged relief patterns at a polymer coating surface by light illumination. The domain size is controlled by the addition of traces of partly insoluble fluorinated acrylate. The photoresponse of the coating is induced by a small amount of copolymerized azobenzene monomers. Upon exposure to UV light, azobenzene undergoes trans to cis isomerization, resulting in a change in molecular order and packing within each domain. The extent of this effect and its directionality depends on the domain orientation. Localized to domain level, this morphological change forms large 3D spikes at the surface with a modulation amplitude of more than 20% of the initial thickness. The process is reversible; the surface topographical patterns erase within 10 s by stopping the light exposure. A finite element model is applied to simulate the surface topography changes of the polydomain coating. The simulations describe the formation of the topographic features in terms of light absorption and isomerization process as a function of the director orientation. The random director distribution leads to surface structures which were foun...Continue Reading

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Citations

Feb 10, 2017·Angewandte Chemie·Sarah J AßhoffNathalie Katsonis
Feb 2, 2018·Nature Communications·Greta BabakhanovaOleg D Lavrentovich
Jun 13, 2018·Soft Matter·Fabian L L VisschersDanqing Liu
Oct 26, 2018·Small·Matthew HendrikxAlbertus P H J Schenning
Mar 14, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Zhibin WenJean-Marie Raquez
Jun 12, 2019·Advanced Materials·Takuya OhzonoEugene M Terentjev
Jul 21, 2016·Advanced Materials·Dong-Dong HanHong-Bo Sun
Jun 20, 2019·Science Advances·Edwin De JongPatrick R Onck
Jun 20, 2019·Physical Review. E·W X QianL H He
Nov 25, 2020·Soft Matter·Sunqian LiuDong Yuan
Mar 7, 2021·Materials·Huaizhe YuNicholas L Abbott
Dec 6, 2016·Chemistry of Materials : a Publication of the American Chemical Society·Francisco Fernandez-PalacioArri Priimagi
Aug 24, 2021·Frontiers in Chemistry·Dandan XueJianbin Luo
Dec 22, 2016·ACS Applied Materials & Interfaces·Yuyun LiuYanlei Yu
Nov 9, 2021·Chemical Reviews·Zhiwei LiYadong Yin

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