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Synthesis of Anisotropic Poly(N-isorpopylacrylamide)/Inorganic-Nanosheets Composite Gels by γ-Radiation-Induced Polymerization and Crosslinking

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The anisotropic gels of poly(N-isopropylacrylamide) hybridized with liquid crystalline clay nanosheets, which show improved mechanical strength and anisotropy, were synthesized by γ-ray-induced polymerization and cross-linking. The aqueous mixtures of the monomer and liquid crystalline nanosheets were irradiated by γ-ray from 60Co radiation source to synthesize the gels. In the gels synthesized in a glass capillary, the nanosheets were aligned macroscopically along the long axis of the glass capillary as revealed by polarized light microscope observation and smallangle X-ray scattering measurement. The gel also showed anisotropy in thermo-responsive volume phase transition. The mechanical property of the gel was tunable by changing the nanosheet concentration and radiation dose. The elasticity of the gel was 18 kPa at maximum and this value is about 4.7 times higher than the gels synthesized by using a chemical cross-linker. Some of the gels with added clay mineral does not collapse even at 90% strain, indicating the high compressive strength.
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Keywords: Anisotropic Soft Material; Inorganic-Polymer Composite Gel; Nanosheet Liquid Crystal; Radiation-Induced Polymerization and Crosslinking

Document Type: Research Article

Affiliations: 1: Material Science and Production Engineering, Graduate School of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-ku, Fukuoka, 811-0295, Japan 2: Department of Advanced Functional Materials Research, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma, 370-1292, Japan 3: Department of Advanced Functional Materials Research, Takasaki Advanced Radiation Research Institute, Quantum Beam Science Research Directorate, National Institutes for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma, 370-1292, Japan

Publication date: 01 September 2016

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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