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Photo deformation in azobenzene liquid-crystal network: Multiscale model prediction and its validation

Title
Photo deformation in azobenzene liquid-crystal network: Multiscale model prediction and its validation
Author
최준명
Keywords
Ab initio calculations; Isomerization; Photo deformation; Liquid crystal network; Azobenzene
Issue Date
2015-09
Publisher
ELSEVIER SCI LTD
Citation
POLYMER, v. 75, Page. 51-56
Abstract
Azobenzene liquid-crystal networks (LCNs) are well known for their photo-deformation, shrinking in UV light, and reverting to their original shape in visible light. Such reversible deformation is due to trans-cis photoisomerization of the azobenzene monomer, which disturbs well-aligned order of nematic LCN. In order to predict the photo-strain of azobenzene LCNs in multiple conditions (light intensity, polarization angle, and temperature), we propose using a density functional theory (DFT)-based modeling approach, which integrates stimulated Raman adiabatic passage calculations (STIRAP), non-linear Beer's law, and polymer physics. The model predicts that as the azobenzene ratio increases, the penetration depth of photo strain decreases, whereas the shrinkage ratio of the LCN in the unit cell increases. We identify that this opposite tendency of change is the reason why there is bending limit during the photo bending of azobenzene LCN films when increasing the ratio of the azobenzene monomer, which was also measured in experimental data. (C) 2015 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S003238611530152Xhttps://repository.hanyang.ac.kr/handle/20.500.11754/100594
ISSN
0032-3861; 1873-2291
DOI
10.1016/j.polymer.2015.08.013
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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