Synthesis of SiCN@TiO2 core-shell ceramic microspheres via PDCs method |
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| Institution: | 1. School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China;2. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China;1. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China;2. Shandong Guiyuan Advanced Ceramics Co., Ltd., Zibo 255086, China;3. School of Transportation and Verhicle Engineering, Shandong University of Technology, Zibo 255000, China;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Institute of water Resources and hydro-electric Engineering, Xi`an University of Technology, Xi’an 710048, China;5. State Grid Gansu Electric Power Research Institute, Lanzhou 730070, China |
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| Abstract: | A facile and effective polymer-derived ceramics (PDCs) emulsification-crosslinking-pyrolysis method was developed to fabricate SiCN@TiO2 core-shell ceramic microspheres with polyvinylsilazane (PVSZ) and tetrabutyl titanate (TBT) as precursors. The TBT: PVSZ mass ratios, emulsifier concentrations and the pyrolysis temperature were examined as control parameters to tune the size and morphology of microspheres. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) confirmed the synthesized SiCN@TiO2 microspheres to be comprised of SiCN core coated with TiO2 crystals, with an average size of 0.88 μm when pyrolyzed at 1400 °C. The analysis of Fourier transform infrared spectroscopy (FT-IR), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) ensured that SiCN@TiO2 core-shell ceramic microspheres composed of rutile TiO2, β-SiC and Si3N4 crystalline phases, The thermal properties were characterized by thermogravimetric analysis (TGA). The obtained SiCN@TiO2 core-shell ceramic microspheres were the promising candidate of the infrared opacifier in silica aerogels and this technique can be extended to other preceramic polymers. |
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| Keywords: | Polymer-derived ceramics Ceramic microspheres Core-shell Polyvinylsilazane Nanocomposites |
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