Phase Transfer of Gold Nanoparticles across a Water/Oil Interface by Stoichiometric Ion-Pair Formation on Particle Surfaces
Phase Transfer of Gold Nanoparticles across a Water/Oil Interface by Stoichiometric Ion-Pair Formation on Particle Surfaces
复制标题
通过在颗粒表面形成化学计量离子对来实现金纳米颗粒跨水/油界面的相转移
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
K. Kimura
中科院分区：
文献类型：
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作者：
H. Yao;Osamu Momozawa;T. Hamatani;K. Kimura
证明了表面修饰的金纳米粒子在水/甲苯界面上的转移。通过透射电子显微镜、红外光谱、紫外-可见吸收光谱和能量色散X-射线能谱分析表明，粒子表面的羧酸根离子对与四辛基铵阳离子形成了化学计量的离子对，导致了相转移。还给出了所转移的金纳米颗粒的表面结构。在纳米粒子从水向有机相转移的过程中，纳米粒子的分散性有所改善，平均粒径略有减小(3.6→2.9 nm)，但粒径分布略有变窄(标准差为0.80→0.5 4 nm)。这些现象可能导致一种新的尺寸和/或分散性选择方法。
The transfer of surface-modified gold nanoparticles across a water/toluene interface was demonstrated. Stoichiometric ion-pair formation between carboxylate anions on particle surfaces and tetraoctylammonium cations brought about the phase transfer, and was revealed by transmission electron microscopy (TEM), IR, UV-vis absorption, and energy dispersive X-ray (EDX) spectroscopies. A surface structure of the transferred gold nanoparticles was also presented. During the nanoparticle transfer from water into an organic phase, an improvement in the dispersibility and a slight decrease in the average diameter were observed (3.6 → 2.9 nm) accompanied by a slight narrowing in the size distribution (standard deviation: 0.80 → 0.54 nm). The phenomena could lead to a new methodology for size and/or dispersibility selections.