Surfactant-free synthesis of water-soluble anatase nanoparticles and their application in preparation of high optic performance monoliths

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• 作者：Yunan Zhao ; Wanzhong Ren ; Hongtao Cui ; ^{htcui@ytu.edu.cn}
• 关键词：Anatase ; Nanoparticles ; Water-solubility ; Sol&ndash ; gel ; Surfactant-free ; TiO2&ndash ; SiO2 monolith ; UV-shielding
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：15 May, 2013
• 年：2013
• 卷：398
• 期：Complete
• 页码：7-12
• 全文大小：873 K

文摘

Highly water-soluble 2 nm anatase nanoparticles were synthesized under mild conditions via a simple, scalable and surfactant-free sol-gel method. The covalent bonding of butoxy groups with surface Ti ions prevents mutual contact of surface hydroxyl groups between particles, leading to the weak inter-linkage of particles in powder. As a result, the obtained powder can be easily dissolved in water just by gentle shaking of container because of the formation of hydrogen bonds between water molecules and surface hydroxyl groups of particles. Originated from the water soluble property of TiO₂ nanoparticles, polishable TiO₂-SiO₂ composite monoliths were prepared for application in UV-shielding. The obtained monolith shows high transparency in visible range and excellent absorption efficiency in UV band.