Preparation of nanosized hollow silica spheres from Na₂SiO₃ using Fe₃O₄ nanoparticles as templates

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• 作者：Chun Liu ; Aili Wang ; Hengbo Yin ; ^{yin@ujs.edu.cn} ; Yutang Shen ; Tingshun Jiang
• 关键词：Hollow silica spheres ; Sodium silicate ; Fe3O4 nanoparticles ; Herbicide release
• 刊名：Particuology
• 出版年：2012
• 期刊代码：P32_16742001
• 类别：ce
• 出版时间：June, 2012
• 卷：10
• 期：3
• 页码：352-358
• 文件大小：2590 K

摘要

Nanosized hollow silica spheres with average diameters from 43 to 70 nm were prepared by removal of Fe₃O₄ templates with hydrochloric acid from silica-coated Fe₃O₄ core-shell composites. The shells of the hollow silica spheres had nanopores with average diameters of 0.92-1.25 nm. When the silica-coated Fe₃O₄ core-shell composites were prepared at a high pH value or with a low mole ratio of Na₂SiO₃ to Fe₃O₄, the resulting hollow silica spheres consisted of highly porous shells. When the silica-coated Fe₃O₄ core-shell composites were prepared with a high mole ratio of Na₂SiO₃ to Fe₃O₄, the resulting hollow silica spheres had large diameters and thick shells. The release rate of herbicide, ammonium glyphosate, could be tuned by using hollow silica spheres with different shell thicknesses.