反相微乳液的制备及其在纳米LaAlO3制备中的应用.pdfVIP

学兔兔 第13卷第6期 粉末冶金材料科学与工程 2008年 l2月 、 ．13 NO．6 Materials Science and Engineering of Powder Metallurgy Dec．2OO8 反相微乳液的制备及其在 纳米LaAIO3制备中的应用 田中青，黄伟九 (重庆工学院 材料科学与工程学院，重庆 400050) 摘 要：以Span80和Tween80作表面活性剂、环己烷为油相、纯水或水溶液为水相制备微乳液，研究表面活性 剂和水相性质等各种因素对其微乳区的影响，并用x射线衍射(XRD)和透射电镜(TEM)对在该体系微乳区中制备 的LaAIO3纳米粒子进行表征。结果表明，以Span80和Tween80作复合表面活性剂、正丁醇为助表面活性剂，可 以获得较大的微乳区。在此微乳区中在800℃温度下即可获得纯度较高、结晶良好的钙钛矿结构LaA103纳米粉 体，该粉体为单分散的球形粒子，粒径在30~60 nm之间，在微波电子器件及高温超导薄膜等领域有巨大的应用 前景。 关键词：微乳液；铝酸镧；纳米 中图分类号：TM 534 文献标识码：A 文章编号：1673．0224(2008)6．369-04 Preparation of reverse microemulsion and its application to synthesis of LaAIO3 nanoparticles TIAN Zhong-qing，HUANG Wei-jiu (School ofMaterials Science and Engineering，Chongqing Institute ofTechnology,Chongqing 400050，China) Abstract：Effect of compositions on microemuslsion zone in W／O microemulsion，consisting of tween-80 and span80 (surfactant)，cyclohexane(oil phase)and pure water or solution(water phase)，were studied and the phase diagrams were drawn．The XRD and TEM were used to characterize LaA103 nanoparticles synthesized in microemuslsion zone．The results show that considerably large microemuslsion zone is gained when both tween80 and span80 are used as surfactant and n-Hexyl alcohol is used as cosurfactant，and a pure perovskite LaA103 is formed when the precursor calcined at 800 ℃．The size of the LaA103 particle is 30~60 nm and the shape of the loosely agglomerated particles is spherica1． demonstrating that the