Garcia-Martinez Joaquin C, Scott Robert W J, Crooks Richard M
Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, USA.
J Am Chem Soc. 2003 Sep 17;125(37):11190-1. doi: 10.1021/ja037196y.
We describe a strategy for extracting nearly size-monodisperse, 1.7-nm-diameter Pd nanoparticles from within dendrimer hosts. The approach involves two steps. First, an aqueous solution of dendrimer-encapsulated Pd nanoparticles is prepared, followed by the addition of a toluene solution containing an n-alkanethiol. When the two-phase system is stirred, n-alkanethiols presumably self-assemble onto the surface of the Pd nanoparticles, extract them from the dendrimer, and transport them to toluene phase. UV-vis spectroscopy indicates that the Pd nanoparticles, in the form of monolayer-protected clusters, are transported into the toluene phase. FT-IR spectroscopy shows that the dendrimers remain in the aqueous phase. High-resolution transmission electron microscopy shows that the average size and size distribution of the particles do not change during the extraction process.
我们描述了一种从树枝状聚合物主体中提取直径近1.7纳米、大小近乎单分散的钯纳米颗粒的策略。该方法包括两个步骤。首先，制备树枝状聚合物包裹的钯纳米颗粒的水溶液，然后加入含有正链烷硫醇的甲苯溶液。当搅拌两相体系时，正链烷硫醇可能会自组装到钯纳米颗粒的表面，将它们从树枝状聚合物中提取出来，并将它们转移到甲苯相中。紫外-可见光谱表明，以单层保护簇形式存在的钯纳米颗粒被转移到甲苯相中。傅里叶变换红外光谱表明树枝状聚合物保留在水相中。高分辨率透射电子显微镜表明，在提取过程中颗粒的平均尺寸和尺寸分布没有变化。
