Soliwoda Katarzyna, Tomaszewska Emilia, Tkacz-Szczesna Beata, Mackiewicz Ewelina, Rosowski Marcin, Bald Adam, Blanck Christian, Schmutz Marc, Novák Jiří, Schreiber Frank, Celichowski Grzegorz, Grobelny Jaroslaw
Department of Materials Technology and Chemistry and ‡Department of Physical Chemistry of Solutions, Faculty of Chemistry, University of Lodz , Pomorska 163, 90-236 Lodz, Poland.
Langmuir. 2014 Jun 17;30(23):6684-93. doi: 10.1021/la501135q. Epub 2014 Jun 3.
In the present paper we describe a phase transfer of aqueous synthesized gold nanoparticles (AuNPs) from water to toluene using secondary amines: dioctylamine, didodecylamine, and dioctadecylamine. The effect of the hydrocarbon chain length and amount of amines on the transfer efficiency were investigated in the case of nanoparticles (NPs) with three different sizes: 5, 9, and 13 nm. Aqueous colloids were precisely characterized before the transfer process using UV-vis spectroscopy, dynamic light scattering (DLS), small-angle X-ray scattering (SAXS), and transmission electron microscopy (TEM). Nanoparticles were next transferred to toluene and characterized using UV-vis and DLS techniques. It was found that dioctadecylamine provides the most effective transfer of nanoparticles. No time-dependent changes in the NP size were observed after 12 days, showing that the dioctadecylamine-stabilized nanoparticles dispersed in toluene were stable. This indicates that long hydrocarbon chains of dioctadecylamine exhibit sufficiently hydrophobic properties of nanoparticles and consequently their good dispersibility in nonpolar solvent.
在本文中，我们描述了使用仲胺（二辛胺、二癸胺和二硬脂胺）将水相合成的金纳米颗粒（AuNP）从水相转移至甲苯相的过程。在三种不同尺寸（5、9和13纳米）的纳米颗粒（NP）情况下，研究了烃链长度和胺的用量对转移效率的影响。在转移过程之前，使用紫外可见光谱、动态光散射（DLS）、小角X射线散射（SAXS）和透射电子显微镜（TEM）对水相胶体进行了精确表征。接下来将纳米颗粒转移至甲苯中，并使用紫外可见光谱和DLS技术进行表征。结果发现，二硬脂胺能最有效地转移纳米颗粒。12天后未观察到纳米颗粒尺寸随时间的变化，这表明分散在甲苯中的二硬脂胺稳定的纳米颗粒是稳定的。这表明二硬脂胺的长烃链表现出纳米颗粒足够的疏水性质，因此它们在非极性溶剂中具有良好的分散性。
