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以CTAB(十六烷基三甲基溴化铵)/正丁醇/正辛烷/钨酸钠水溶液构制反相微乳体系,通过测定体系电导率的方法确定相点并绘制反相微乳区拟三元相图.考察了该体系在不同条件下稳定存在的组成范围,选取实验最佳条件制备出纳米WO3.结果表明,表面活性剂与助表面活性剂的比、钨酸钠溶液的浓度对该反相微乳体系稳定区域的影响较大,当m(CTAB)∶m(正丁醇)=1∶2,钨酸钠浓度为0.05~0.08 g/mL时,体系有较大的反向微乳区,且当m(CTAB+正丁醇)∶m(正辛烷)=2∶3时,体系有最大溶水量;温度对该体系稳定区域的影响不大.在最适宜条件下,以0.08 g/mL的钨酸钠微乳液与盐酸微乳液,在40℃的水浴中反应7 h,制备出平均粒径约30 nm的WO3纳米粒子.

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