【摘要】 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。更多还原

【Abstract】 Pseudo-ternary phase diagrams of reverse microemulsion systems of cetyl trimethyl ammonium bromide(CTAB),n-butanol,n-octane and Na2WO4 solution were studied by measuring the conductivity of the system.The composition range of the reverse microemulsion system that existed stably under different conditions was investigated.WO3 nanoparticles were prepared under optimal conditions determined from the phase diagrams of the microemulsion systems.It was found that the ratio of surfactantaid to surfactant,and the concentration of Na2WO4 solution are two significant factors to affect the stability of the microemulsion system.When the ratio of m(CTAB)∶m(n-butanol) is 1∶2 and the concentration of Na2WO4 solution is 0.05~0.08 g/mL,the microemulsion phase regions of the reverse microemulsion system that exists stably is bigger;when m(CTAB+n-butanol)∶m(n-octane) is 2∶3,the system has the most quantity of dissolved water;and this system is insensitive to temperature.Under the optimal conditions,WO3 nanoparticles were prepared from the reaction of reverse microemulsion of Na2WO4 solution(0.08 g/mL) and hydrochloric acid reverse microemulsion at 40 ℃ for 7 h.The WO3 nanoparticles were characterized by TEM and the average particle size was about 30 nm.更多还原