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

Journal of Chemical Sciences

Suguna D Adyanthaya²  Hrushikesh M Joshi²  Renu Pasricha³  Murali Sastry1²  Anandrao B Mandale³  Ashavani Kumar²  Rajendra Srivastava¹ 

[1] Catalysis Division, National Chemical Laboratory, Pune 411 008, India$$;Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India$$;Centre for Materials Characterisation, National Chemical Laboratory, Pune 411 008, India$$

关键词: Nanoparticles;    platinum;    phase transfer;    hydrophobization;    X-ray photoemission spectroscopy.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

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 nonpolar 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).

【 授权许可】

Unknown