Journal of Chemical Sciences

, Volume 116, Issue 5, pp 293–300

Phase transfer of platinum nanoparticles from aqueous to organic solutions using fatty amine molecules

  • Ashavani Kumar
  • Hrushikesh M. Joshi
  • Anandrao B. Mandale
  • Rajendra Srivastava
  • Suguna D. Adyanthaya
  • Renu Pasricha
  • Murali Sastry
Article

DOI: 10.1007/BF02708280

Cite this article as:
Kumar, A., Joshi, H.M., Mandale, A.B. et al. J Chem Sci (2004) 116: 293. doi:10.1007/BF02708280

Abstract

In this report we demonstrate a simple process based on amine chemistry for the phase transfer of platinum nanoparticles from an aqueous to an organic solution. The phase transfer was accomplished by vigorous shaking of a biphasic mixture of platinum nanoparticles synthesised in an aqueous medium and octadecylamine (ODA) in hexane. During shaking of the biphasic mixture, the aqueous platinum nanoparticles complex via either coordination bond formation or weak covalent interaction with the ODA molecules present in the organic phase. This process renders the nanoparticles sufficiently hydrophobic and dispersible in the organic phase. The ODA-stabilised platinum nanoparticles could be separated out from hexane in the form of a powder that is readily redispersible in weakly polar and non-polar organic solvents. The ODA-capped platinum nanoparticles show high catalytic activity in hydrogenation reactions and this is demonstrated in the efficient conversion of styrene to ethyl benzene. The nature of binding of the ODA molecules to the platinum nanoparticles surface was characterised by thermogravimetry, transmission electron microscopy (TEM), X-ray photoemission spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR)

Key words

Nanoparticlesplatinumphase transferhydrophobizationX-ray photoemission spectroscopy

Copyright information

© Indian Academy of Sciences 2004

Authors and Affiliations

  • Ashavani Kumar
    • 1
  • Hrushikesh M. Joshi
    • 1
  • Anandrao B. Mandale
    • 3
  • Rajendra Srivastava
    • 2
  • Suguna D. Adyanthaya
    • 1
  • Renu Pasricha
    • 3
  • Murali Sastry
    • 1
  1. 1.Materials Chemistry DivisionNational Chemical LaboratoryPuneIndia
  2. 2.Centre for Materials CharacterisationNational Chemical LaboratoryPuneIndia
  3. 3.Catalysis DivisionNational Chemical LaboratoryPuneIndia