Preparation of monodispersed magnesia coated silica particles through a surface-induced precipitation method |
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| Authors: | Myoung-Hwan Oh Kyeong-Won Kim Sungwon Choi Rajiv K Singh |
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| Affiliation: | 1. Technology Development Division, Kurimoto, Ltd., Shibatani 2-8-45, Suminoe-ku, Osaka 559-0021, Japan;2. Department of Applied Chemistry, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan;1. Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, CZ-193 00 Praha 9, Czech Republic;2. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia;3. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil;1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. Key Laboratory of Environment Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China;3. Mobile E-business 2011 Collaborative Innovation Center of Hunan Province, Hunan University of Commerce, Changsha 410205, PR China;1. Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, PR China;2. University of Science and Technology of China, Hefei 230026, PR China;3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, PR China;1. School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia;2. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35400-00, Brazil;1. Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran;2. Nuclear Engineering and Physics Department, Amirkabir University of Technology, Tehran, Iran |
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| Abstract: | Monodispersed magnesia coated silica particles were prepared by the surface-induced precipitation method, in which a sol type of magnesium precursor was deposited on the surface of spherical silica particles via electrostatic attraction route, and then calcined at 700 °C for 90 min. The magnesium precursor was synthesized by the sol–gel technique, which employs ethanol as a solvent. The resulting particles were characterized with field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermal (TG/DTA) analysis, Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS). The results show the formation of a well-crystallized magnesia layer on the surface of the core silica particles. The resultant coated particles exhibited the spherical shape without the formation of a hard aggregate in spite of the heat treatment. XPS and FTIR investigations also confirmed that the magnesia coating layer and core silica particle were connected through the Mg–O–Si chemical bonding at the interface. |
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