Self-Assembling Systems, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.
J Colloid Interface Sci. 2012 Apr 15;372(1):16-23. doi: 10.1016/j.jcis.2012.01.021. Epub 2012 Jan 20.
This article demonstrates that bicontinuous microemulsions are optimal templates for high yield production of metal nanoparticles. We have verified this for a variety of microemulsion systems having AOT (sodium bis (2-ethyhexyl) sulphosuccinate) or a fluorocarbon (perfluoro (4-methyl-3,6-dioxaoctane)sulphonate) as surfactant mixed with water and oils like n-heptane or n-dodecane. Several types of metal nanoparticles, including platinum, gold and iron, were produced in these microemulsions having a size range spanning 1.8-17 nm with a very narrow size distribution of ±1 nm. Remarkably high mass concentrations up to 3% were reached. Size and concentration of the nanoparticles could be varied with the stoichiometries of the reagents that constituted them. The optimization towards high yield while maintaining low size polydispersity is due to the decoupling of the time scales for the precipitation reaction and for coarsening. In actual fact, coalescence is essentially prevented by the immobilization of nanoparticles within the bicontinuous microemulsion structure.
本文证明双连续微乳液是高产率制备金属纳米粒子的理想模板。我们已经通过各种具有 AOT（双（2-乙基己基）磺基琥珀酸钠）或氟碳（全氟（4-甲基-3,6-二氧杂辛烷）磺酸盐）作为表面活性剂的微乳液体系对此进行了验证，这些体系与水和油（如庚烷或十二烷）混合。在这些微乳液中制备了多种金属纳米粒子，包括铂、金和铁，其尺寸范围为 1.8-17nm，粒径分布非常窄，为±1nm。令人惊讶的是，达到了高达 3%的质量浓度。纳米粒子的尺寸和浓度可以通过构成它们的试剂的化学计量来改变。之所以能够在保持低尺寸多分散性的同时实现高产率的优化，是因为沉淀反应和粗化的时间尺度解耦。实际上，通过将纳米粒子固定在双连续微乳液结构内，基本上可以防止聚结。
