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Facile orientation of unmodified BN nanosheets in polysiloxane/BN composite films using a high magnetic field

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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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Acknowledgements

The authors are grateful for support received from the New Energy and Industrial Technology Development Organization (NEDO), the Ministry of Economy, Trade and Industry (METI) of Japan, and the Ultra Hybrid Material Technology Development Project (“Ultra Hybrid”).

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Authors and Affiliations

  1. Extreme Energy-Density Research Institute, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, Niigata, 940-2188, Japan

    Hong-Baek Cho, Yoshinori Tokoi, Satoshi Tanaka, Tsuneo Suzuki, Weihua Jiang, Hisayuki Suematsu, Koichi Niihara & Tadachika Nakayama

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  1. Hong-Baek Cho
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  2. Yoshinori Tokoi
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  3. Satoshi Tanaka
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  4. Tsuneo Suzuki
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  5. Weihua Jiang
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  6. Hisayuki Suematsu
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  7. Koichi Niihara
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  8. Tadachika Nakayama
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Correspondence to Hong-Baek Cho or Tadachika Nakayama.

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Cho, HB., Tokoi, Y., Tanaka, S. et al. Facile orientation of unmodified BN nanosheets in polysiloxane/BN composite films using a high magnetic field. J Mater Sci 46, 2318–2323 (2011). https://doi.org/10.1007/s10853-010-5075-2

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  • DOI: https://doi.org/10.1007/s10853-010-5075-2

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