摘要
研究了反相微乳体系中各物质的最佳配比和非微乳环境下凝胶和微乳-凝胶形成的条件,合成了高度分散、形貌可控的氧化钼/二氧化硅(MoO3/SiO2)纳米复合氧化物,系统考察了反相微乳-凝胶体系(microemulsion-gel system,MGS)的后处理方式、陈化时间和水相含量。结果表明,MGS的形成必须具备如下条件:在均一稳定的反相微乳体系中,MoO3/SiO2纳米复合氧化物前驱体能形成效果良好的复合凝胶。不同的后处理方式对纳米复合氧化物形貌的影响最大。不同陈化时间主要影响产物的收率(实际所得复合氧化物质量与理论应得复合氧化物质量的比),体系中水相质量分数为13.5%时,所制备纳米复合氧化物的粒径在实验范围内最小。
The optimal charge ratio of reverse microemulsions and the necessary conditions of reverse microemulsion-gel system （MGS） were investigated in Span-80, Tween-80/cyclohexane/water water-in-oil microemulsions and the formation conditions of the molybdic oxide/silica complex gel were studied in non-microemulsion. The highly dispersed and shape-controlled molybdic oxide/ silica nanostructured complex oxides were synthesized by reverse microemulsion-gel method （RMGM）, The aqueous phase content, aging time and the after-treatment method were systematically investigated by the changes of the different parameters in MGS. The results indicate that it is necessary for the formation of MGS that the fine composite gel of the molybdic oxide/silica nanostructured complex oxide precursors be formed in homogeneous stable reverse microemulsion, Different after-treatments have a maximal influence on the shape of nanostructured complex oxides. The yield of the complex oxides was basically influenced by the aging period. We determined that the optimal range of aging period for reverse MGS was 40-48 h. Different aqueous phase contents influence the shape of nanostructured complex oxides. The smallest grain size of the nanostructured complex oxides could be obtained in the experimentation ambit of the study, in which the aqueous phase content was 13.5% in mass in the MGS.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2007年第3期342-347,共6页
Journal of The Chinese Ceramic Society
关键词
氧化钼/二氧化硅
纳米复合氧化物
形貌控制
微乳-凝胶法
molybdic oxide/silica
nanostructured complex oxides
shape controlling
microemulsion-gel method
