Abstract

Stable silver nanoparticles have been obtained in reverse micelles of known and available nonionic surfactants, sorbitan monooleate (Span 80) and tetraethoxylated dodecanol and p-nonylphenol (Brij 30 and Tergitol NP-4, respectively), in n-decane. The obtained nanoparticles have been characterized using a number of physicochemical methods. The stability, hydrodynamic diameter, and electrokinetic potential of the nanoparticles have been studied as depending on the amounts of added water; chloroform; and an anionic surfactant, sodium bis(2-ethylhexyl)sulfosuccinate (AOT). It has been shown that, for different surfactants, AOT should be introduced in different ways to provide the nanoparticles with the electrokinetic potential values sufficient for enhancing their stability and ensuring the possibility of concentrating them by nonaqueous electrophoresis. In the case of Brij 30, it is preferable to introduce AOT after the synthesis as a “charging additive,” while, in the case of Tergitol NP-4, it should be added as a cosurfactant at the stage of the synthesis. The nanoparticles synthesized in Span 80 micelles have a rather high electrokinetic potential even in the absence of the additives. In this case, the use of AOT as a cosurfactant decreases the electrokinetic potential of the nanoparticles, while, being added after the synthesis, it increases the potential.

中文翻译：

---

非离子表面活性剂反胶束及其与AOT混合胶束中银纳米粒子的合成与表征

摘要

稳定的银纳米颗粒已在公知的和可用的非离子表面活性剂，山梨糖醇单油酸酯（司盘80）和四乙氧基化十二烷醇和的反胶束中获得p -nonylphenol（30的Brij和Tergitol NP-4，分别地），在Ñ-癸烷 已使用多种物理化学方法对获得的纳米颗粒进行了表征。已经研究了纳米颗粒的稳定性，流体动力学直径和电动势，具体取决于所添加的水的量。氯仿 阴离子表面活性剂双（2-乙基己基）磺基琥珀酸钠（AOT）。已经表明，对于不同的表面活性剂，应该以不同的方式引入AOT，以为纳米粒子提供足以增强其稳定性并确保通过非水电泳浓缩纳米粒子的电动势值。在Brij 30的情况下，最好在合成后引入AOT作为“加料添加剂”，而在Tergitol NP-4的情况下，应在合成阶段添加作为辅助表面活性剂。即使在没有添加剂的情况下，在Span 80胶束中合成的纳米颗粒也具有相当高的电动势。在这种情况下，使用AOT作为助表面活性剂会降低纳米粒子的电动势，而在合成后添加，则会增加电势。