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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/115/05-06/0679-0687

    • Keywords

       

      Phase transfer; interdigitation; gold nanoparticles; liquid-liquid interface

    • Abstract

       

      This paper describes the formation of water-dispersible gold nano-particles capped with a bilayer of sodium dodecylsulphate (SDS) and octadecylamine (ODA) molecules. Vigorous shaking of abiphasic 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.

    • Author Affiliations

       

      Anita Swami1 Amol Jadhav1 Ashavani Kumar1 Suguna D Adyanthaya1 Murali Sastry1

      1. Materials Chemistry Division, National Chemical Laboratory, Pune - 411 008, India
    • Dates

       
  • Journal of Chemical Sciences | News

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