摘要
采用四甲氧基硅和氯化镁为前躯体,通过溶胶-凝胶和高温水热法合成了内径5nm^10nm,外径约15nm^35nm,长度400nm^2μm的纤蛇纹石纳米管,利用X射线衍射仪(XRD)、扫描电子显微镜(FSEM)和高分辨透射电子显微镜(HRTEM)对合成样品的物相、形貌和结构进行了表征;初步试验表明,纤蛇纹石纳米管的形成过程是氢氧化镁优先在一维方向上生长成针状或纤维状结构,在溶液中形成结构导向模板后与非晶态的二氧化硅反应形成纳米管状结构;通过控制化学计量比在一定范围内可以实现纳米管的内外径尺寸的调控。
By using Tetramethyl orthosilicate （TMOS） and magnesium chloride as precursors, chrysotile nanotubes were synthesized through sol-gel hydrothermal process. The inner and outer diameters of nanotubes were about 5nm ～ 10nm and 15nm ～ 35nm, respectively, 400nm～2μm micrometers in length. The crystal phase, morphology and micro structure of samples were characterized by X-ray diffractometry （XRD）, field emission scanning electron microscopy （FSEM）, and high resolution transmission electron microscopy （HRTEM）. The experimental results show that the chrysotile formation process was the formation of one dimensional Mg（OH）2 nanofibers firstly in hydrothermal system, and then the Mg（OH）2 nanofibers acted as a structural template to react with amorphous SiO2 to form chrysotile naotube structure. The inner and outer diameters of nanotubes could be adjustable in a certain range by changing the composition of the precursors.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2009年第4期530-533,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(50472028)
关键词
溶胶-凝胶
水热合成
纤蛇纹石
纳米管
sol-gel
hydrothermal synthesis
chrysotile nanotube
formation mechanism
作者简介
赵鹏（1967-），博士，教授，从事纳米材料制备与性能研究。E—mail：zyzhaop@chd．edu．cn。
