Aerosol assisted synthesis of silica/phenolic resin composite mesoporous hollow spheres |
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Authors: | Xianglin Yu Shujiang Ding Zhaokai Meng Jiguang Liu Xiaozhong Qu Yunfeng Lu Zhenzhong Yang |
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Institution: | (1) State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China;(2) Chemical and Biomolecular Engineering Department, University of California at Los Angeles, Los Angeles, CA 90095, USA |
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Abstract: | Hollow spheres of phenolic resin/silica composite are synthesized by macroscopic phase separation of a sorbitan monooleate
surfactant Span 80 during aerosol-assisted spraying. The cavity can be evolved from multiple compartments to single hollow
cavity with the increase of Span 80 content. The composite shell becomes mesoporous due to the release of small molecules
after thermal treatment above 350 °C. After further thermal treatment at a higher temperature for example 900 °C in nitrogen
or 1,450 °C in argon, the carbon/silica composite hollow spheres or crystalline silicon carbide hollow spheres are derived,
respectively. Compared to the pure phenolic resin-based carbon spheres, thermal stability of the carbon-based composite spheres
in air is essentially improved by the introduction of inorganic component silica. The carbon-based composite hollow spheres
combine both performances of easy mass transportation through macropores and high specific surface area of mesopores, which
will be promising to support catalysts for fuel cells.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Hollow spheres Mesoporous Carbon Composite Template |
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