Synthesis of BN-coated Cerium (IV) Oxide Fine Particles and Their Application as UV Blocking Materials

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  • MASUI Toshiyuki
    Department of Applied Chemistry, Faculty of Engineering, Osaka University
  • YAMAMOTO Misa
    Department of Applied Chemistry, Faculty of Engineering, Osaka University
  • HAMADA Ryo
    Department of Applied Chemistry, Faculty of Engineering, Osaka University
  • ADACHI Gin-ya
    Department of Applied Chemistry, Faculty of Engineering, Osaka University

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  • BNコート酸化セリウム微粒子の合成と紫外線遮断剤への応用
  • BN コート サンカ セリウム ビリュウシ ノ ゴウセイ ト シガイセン シャダンザイ エ ノ オウヨウ

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Cerium oxide (CeO2) has been expected as a UV blocking material, especially for a sunscreen in cosmetics. However, high catalytic activity and pale yellow color of CeO2 are problems for practical use. In this study, a new UV blocking material consisting of Ce02 and turbostratic boron nitride (t-BN) has been synthesized using a reaction between boric acid and ammonia gas on the surface of CeO2 fine particles. The surface coating with t-BN was very effective in reducing the thermal and photocatalytic activities of oil decomposition. The mean sizes of the primarily and the secondary particles were 8 nm and 1. 4, μm, respectively. The coverage of the CeO2 surface with t-BN was 90%. From the UV-vis absorption measurement, it became clear that the BN-coated CeO2 particles showed higher transparency and more effective UV blocking than the conventional micronized titanium dioxide or zinc oxide particles.

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