title: Photo-Induced Anomalous Deformation of Poly(N-Isopropylacrylamide) Gel Hybridized with an Inorganic Nanosheet Liquid Crystal Aligned by Electric Field.
abstract: Poly-(N-isopropylacrylamide) (PNIPA) hydrogel films doped with uniaxially aligned liquid crystalline (LC) nanosheets adsorbed with a dye are synthesized and its anomalous photothermal deformation is demonstrated. The alignment of the nanosheet LC at the cm-scale is easily achieved by the application of an in-plane or out-of-plane AC electric field during photo-polymerization. A photoresponsive pattern is printable onto the gel with μm-scale resolution by adsorption of the dye through a pattern-holed silicone rubber. When the gel is irradiated with light, only the colored part is photothermally deformed. Interestingly, the photo-irradiated gel shows temporal expansion along one direction followed by anisotropic shrinkage, which is an anomalous behavior for a conventional PNIPA gel.
authors.affiliation: Department of Life, Environment and Materials Science, Graduate School of Fukuoka Institute of Technology, 3-30-1 Wajirohigashi, Higashiku, Fukuoka, 811-0295, Japan.
authors.forename: Takumi
authors.initials: T
authors.lastname: Inadomi
authors.forename: Shogo
authors.initials: S
authors.lastname: Ikeda
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Okumura
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Kikuchi
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Miyamoto
keywords: hydrogels; inorganic nanosheets; layered materials; liquid crystals; poly(N-isopropylacrylamide)s