氧化锆纳米复合材料.pdf

第22卷第5期
化学研究
中国科技核心期刊
2011年9月
CHEMICAL RESEARCH
hxy(@henu.edu.cn
Synthesis of sheet-like silica/zirconia nanocomposites
by sol-gel process
GUO Jian-hui, 2, LI Xiao-hong, LI Zhi-wei, DU Zu-liang, ZHANG Zhi-jun
(1. Key Laboratory of Ministry of Education for Special Functional Materials, Henan University
Kaifeng 475004, Henan, China; 2. College of Chemistry and Chemical Engineering
Henan University, Kaifeng 475004, Henan, China)
Abstract: A facile sol-gel process was used to prepare sheet-like Sio/Zro, composites from zin
conium oxychloride and diethoxydimethylsilane as the precursors in the absence of any surfac
tants. The process involves the oriented growth of Sio/Zro nanocomposites in the mixed sol-
vent of water and n-propanol. Tetragonal zirconia (t-zro2 crystal was obtained by calcining
dried sheet-like SIO2 /Zro gel at 500 C in air for 2 h. The structure and morphology of the
products were analyzed by means of X-ray diffr
raction, scanning electron microscopy, ane
transmission electron microscopy. The elemental composition of typical products was deter-
mined by means of energy-dispersive X-ray spectrometry. The chemical feature of dried Sio,/
Zro gel was analyzed using a Fourier transform infrared spectrometer. It has been found that
1O: /Zro nanocomposite with a grain size of about 18 nmn can be readily prepared by the so1-
gel process. Si atom in the nanocomposite is chemically linked to Zr via Si-o-zr bond; and it
only affects the morphology of Zro crystalline but does not lead to changes in the size and
phase structure of tetragonal zirconia. The present approach may be extended to
preparing oth
er similar hierarchical structures of inorganic functional nanomaterials
Keywords: Si0:/Zro; sheet like hierarchical structure; sol-gel method; synthesis; character
ization
CLC number: 0 627. 12
Document code
Article ID:1008-1011(2011)05-0049-06
溶胶凝胶法制备片状氧化硅/氧化锆纳米复合材料
郭建辉2,李晓红!,李志伟,杜祖亮,张治军1
(].河南大学特种功能材料重点实验室,河南开封475004;2.河南大学化学化工学院,河南开封475004)
摘要:以氧氯化锆和二甲基二乙氧基硅烷为前驱体,在无任何表面活性剂的条件下,利用溶胶-凝胶法制备了
片状SiO2/ZrO复合材料.采用X射线衍射仪、扫描电镜、能谱仪、傅立叶变换红外光谱仪、透射电镜等分析了j
物的结构和形貌,并探讨了SiO2/ZrO)2纳米复合材料的取向生长机理.结果表明,在正丁醇和水的混合溶液中制
备的SiO2/ZrO2纳米复合材料的粒径为18nm,将干凝胶在500C空气气氛中焙烧2h可以得到四方相片状氧
化锆晶体,化合物中的硅原子通过Si一0一Zr化学键与错原子相连;硅的引入仅影响氧化锆晶体的形貌,而不
导致四方相氧化错结构和尺寸的改变.本文所述方法可望拓展用于制备其他具有类似分级结构的无机功能纳
米材料.
Received date: 2011-04-08
Foundation item. National Natural Science Foundation of China (20872026) and Natural Science Foundation of Iienan Educational Commit
e, China(2009B430002)
Biography: Guo Jian-hui (1978), lecturer. Corresponding author. E-mail: zzj391@ yahoo. en