Phase transfer of aqueous colloidal gold particles into organic solutions containing fatty amine molecules

Murali Sastry, Ashavani Kumar, Priyabrata Mukherjee

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

We demonstrate the phase transfer of colloidal gold particles synthesized in an aqueous medium into toluene containing the cationic surfactant, octadecylamine (ODA). During vigorous shaking of the biphasic mixture, rapid transfer of the gold particles into the organic phase was observed. The phase transfer of the colloidal gold particles arises due to coupling of the gold particles with the organic phase ODA molecules via either coordination bond formation or weak covalent interaction. This process renders the particles sufficiently hydrophobic and soluble in the organic phase. The ODA-stabilized colloidal gold particles could be separated out in the form of a powder and readily dissolved in different organic solvents. The nature of binding of the ODA molecules to the gold particle surface was characterized using thermogravimetry/differential thermal analysis, as well as Fourier transform infrared spectroscopy. To the best of our knowledge, this is the first demonstration of the phase transfer of colloidal gold particles by direct co-ordination to primary amines. The protocol described herein does not require the use of acid, a feature common to similar phase transfer protocols involving alkanethiols as the co-ordinating and hydrophobizing agent.

Original languageEnglish (US)
Pages (from-to)255-259
Number of pages5
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume181
Issue number1-3
DOIs
StatePublished - Jun 15 2001
Externally publishedYes

Fingerprint

Gold Colloid
Amines
amines
Gold
gold
Molecules
molecules
Cationic surfactants
Toluene
Powders
Organic solvents
Differential thermal analysis
Thermogravimetric analysis
Demonstrations
Acids
stearylamine
shaking
Fourier transform infrared spectroscopy
thermogravimetry
toluene

Keywords

  • Colloidal particles
  • Hydrophobization
  • Phase-transfer

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Phase transfer of aqueous colloidal gold particles into organic solutions containing fatty amine molecules. / Sastry, Murali; Kumar, Ashavani; Mukherjee, Priyabrata.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 181, No. 1-3, 15.06.2001, p. 255-259.

Research output: Contribution to journalArticle

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