Journal
ACS MACRO LETTERS
Volume 1, Issue 11, Pages 1357-1361Publisher
AMER CHEMICAL SOC
DOI: 10.1021/mz300447j
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [23225003]
- PRESTO program of Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [23245047, 23225003] Funding Source: KAKEN
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Nematic liquid crystalline (LC) cross-linked polymer gel sheets containing 3 mol % azobenzene (Az) unit were prepared and swollen by a nematic solvent of 4'-pentyl-4-cyanobiphenyl (5CB). This 5CB-swollen gel sheet exhibited a discontinuous volume change around the nematic-isotoropic phase transition temperature of the LC gel (T-NI(G)). UV irradiation at a temperature slightly lower than T-NI(G) provoked a large volume transition (expansion) due to a loss of nematic order within the gel sheet caused by the trans-to-cis photoisomerization of Az. The volume was reverted by irradiation with 436 run light By templating the colloidal crystal film of monodispersed silica particles, a LC gel sheet possessing a microporous structure was also prepared. Due to the facilitated diffusion of 5CB the microporous LC gel exhibited significant enhancements,in the extent and rate of the photoinduced volume transition.
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