Bumajdad Ali, Eastoe Julian, Zaki Mohamed I, Heenan Richard K, Pasupulety Lata
Kuwait University, Chemistry Department, Faculty of Science, P.O. Box 5969, Safat 13060, Kuwait.
J Colloid Interface Sci. 2007 Aug 1;312(1):68-75. doi: 10.1016/j.jcis.2006.09.007. Epub 2006 Sep 9.
The phase behavior and structure of aqueous-in-n-heptane microemulsions, stabilized by surfactant mixtures of di-n-didodecyldimethylammonium bromide, DDAB, and Brij(R)35 were studied by small angle (neutron or X-ray) scattering techniques. The aqueous nanodroplets contain either a precursor reactive salt or a precipitating agent, so that simple mixing induces nanoparticle formation. These formulated microemulsions display good phase stability against added polar additives such as monovalent, divalent, trivalent metal ions, ammonia solution, tetrabutylammonium hydroxide, and their mixtures. Nanoparticle formation was demonstrated via precipitation of metal oxides inside the water nanodroplets, affording control over the resulting particle size. Nanoparticle characteristic size (XRD- and HR-TEM derived sizes) and specific surface areas (S(BET) (m(2)g(-1))) for iron oxide and CeO(2) prepared in these mixed microemulsions, are compared with those stabilized by single surfactants DDAB and Pure AOT.
采用小角（中子或X射线）散射技术研究了由二正十二烷基二甲基溴化铵（DDAB）和Brij(R)35表面活性剂混合物稳定的正庚烷包水型微乳液的相行为和结构。水性纳米液滴含有前体反应性盐或沉淀剂，因此简单混合即可诱导纳米颗粒形成。这些配制的微乳液对添加的极性添加剂（如一价、二价、三价金属离子、氨溶液、氢氧化四丁基铵及其混合物）表现出良好的相稳定性。通过水纳米液滴内金属氧化物的沉淀证明了纳米颗粒的形成，从而可以控制所得颗粒的尺寸。将在这些混合微乳液中制备的氧化铁和CeO₂的纳米颗粒特征尺寸（XRD和HR-TEM得出的尺寸）和比表面积（S(BET) (m²g⁻¹)）与由单一表面活性剂DDAB和纯AOT稳定的纳米颗粒进行了比较。
