Water-dispersible nanoparticles via interdigitation of sodium dodecylsulphate molecules in octadecylamine-capped gold nanoparticles at a liquid-liquid interface

Journal of Chemical Sciences

Amol Jadhav¹  Suguna D Adyanthaya¹  Anita Swami¹  Murali Sastry1¹  Ashavani Kumar¹ 

[1] Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India$$

关键词: Phase transfer;    interdigitation;    gold nanoparticles;    liquid-liquid interface.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

This paper describes the formation of water-dispersible gold nanoparticles capped with a bilayer of sodium dodecylsulphate (SDS) and octadecylamine (ODA) molecules. Vigorous shaking of a biphasic mixture consisting of ODA-capped gold nanoparticles in chloroform and SDS in water results in the rapid phase transfer of ODA-capped gold nanoparticles from the organic to the aqueous phase, the latter acquiring a pink, foam-like appearance in the process. Drying of the coloured aqueous phase results in the formation of a highly stable, reddish powder of gold nanoparticles that may be readily redispersed in water. The water-dispersible gold nanoparticles have been investigated by UV-Vis spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR). These studies indicate the presence of interdigitated bilayers consisting of an ODA primary monolayer directly coordinated to the gold nanoparticle surface and a secondary monolayer of SDS, this secondary monolayer providing sufficient hydrophilicity to facilitate gold nanoparticle transfer into water and rendering them water-dispersible.

【 授权许可】

Unknown