Facile orientation of unmodified BN nanosheets in polysiloxane/BN composite films using a high magnetic field |
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Authors: | Hong-Baek Cho Yoshinori Tokoi Satoshi Tanaka Tsuneo Suzuki Weihua Jiang Hisayuki Suematsu Koichi Niihara Tadachika Nakayama |
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Affiliation: | (1) Extreme Energy-Density Research Institute, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka Niigata, 940-2188, Japan |
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Abstract: | Composite films consisting of highly oriented boron nitride (BN) nanosheets in polysiloxane were fabricated without modifying
the BN surface by applying a high magnetic field generated by a superconducting magnet. The hexagonal BN nanosheets were dispersed
by sonication in a prepolymer mixture of polysiloxane. The homogeneous suspension was then cast on a polyamide spacer of microscale
thickness and a magnetic field was applied before the mixture became crosslinked. The BN nanosheets in the polysiloxane were
aligned with high anisotropy either parallel or perpendicular to the composite film plane depending on the magnetic flux direction.
The fabricated composite films exhibited enhanced thermal conductivity by controlling the anisotropy of the BN nanosheets
in the film. The mechanisms for rotation of BN nanosheets and heat diffusion across the composite film are discussed. |
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