The aerosol OT plus n-butanol plus n-heptane plus water system:: Phase behavior, structure characterization, and application to Pt70Fe30 nanoparticle synthesis
The aerosol OT plus n-butanol plus n-heptane plus water system:: Phase behavior, structure characterization, and application to Pt70Fe30 nanoparticle synthesis
复制标题
DOI：
10.1021/la702146q
复制
发表时间：
2007-10-23
期刊：
影响因子：
3.9
通讯作者：
Villullas, H. Mercedes
中科院分区：
文献类型：
--
作者：
Malheiro, Arthur R.;Varanda, Laudemir C.;Villullas, H. Mercedes
本文给出了AOT +正丁醇/正庚烷/水三元气溶胶体系在AOT/正丁醇质量比为2时的相图。电导率测量表明，在观察到的广阔的单相微乳液区域内，从油包水到水包油的结构转变连续发生，没有相分离。将该伪三元体系应用于碳负载型Pt70Fe30纳米颗粒的合成，结果表明，在相同条件下，以正丁醇微乳液制备的纳米颗粒比以AOT/正庚烷/水三元微乳液制备的纳米颗粒含铁量更高。实验证实，在AOT/正庚烷/水体系中引入正丁醇作为共表面活性剂，可以完全还原铁离子，从而获得具有所需成分的合金聚四氟乙烯纳米颗粒，而无需制备功能化表面活性剂和/或使用惰性气氛。
A phase diagram of the pseudo-ternary Aerosol OT (AOT) + n-butanol/n-heptane/water system, at a mass ratio of AOT/n-butanol = 2, is presented. Conductivity measurements showed that within the vast one-phase microemulsion region observed, the structural transition from water-in-oil to oil-in-water microemulsion occurs continuously without phase separation. This pseudo-ternary system was applied to the synthesis of carbon-supported Pt70Fe30 nanoparticles, and it was found that nanoparticles prepared in microemulsions containing n-butanol have more Fe than those prepared in ternary microemulsions of AOT/n-heptane/water under similar conditions. It was verified that introducing n-butanol as a cosurfactant into the AOT/n-heptane/water system lead to complete reduction of the Fe ions that allowed obtaining alloyed PtFe nanoparticles with the desired composition, without the need of preparing functionalized surfactants and/or the use of inert atmosphere.