Reversible formation of gold nanoparticle–surfactant composite assemblies for the preparation of concentrated colloidal solutions

Shalkevich, Natallia; Shalkevich, Andrey; Si-Ahmed, Lynda; Bürgi, Thomas

doi:10.1039/b912571j

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Journal article

Reversible formation of gold nanoparticle–surfactant composite assemblies for the preparation of concentrated colloidal solutions

Shalkevich, Natallia Université de Neuchâtel, Institut de Physique, Laboratoire de chimie physique des surfaces, Switzerland
Shalkevich, Andrey University of Fribourg, Adolphe Merkle Institute and Fribourg Center for Nanomaterials, Switzerland
Si-Ahmed, Lynda Metalor Technologies SA, Neuchâtel, Switzerland
Bürgi, Thomas Université de Neuchâtel, Institut de Physique, Laboratoire de chimie physique des surfaces, Switzerland - Ruprecht-Karls-Universität Heidelberg, Physikalisch-Chemisches Institut, Germany

17.09.2009

Published in:

Physical Chemistry Chemical Physics. - 2009, vol. 11, p. 10175-10179

English We have developed a simple method for the preparation of nearly mono-dispersed stable gold colloids with a fairly high concentration using a two step procedure. First we synthesize citrate capped gold nanoparticles and then exchange the citrate ions with triethyleneglycolmono-11-mercaptoundecylether (EGMUDE). This leads to the immediate precipitation and formation of composite assemblies. The gold nanoparticles were successfully self-redispersed after a few days. The prepared gold colloid can be easily concentrated up to 20 times by separation of the flocculated part. UV-visible spectra, transmission electron microscopy (TEM), and dynamic light scattering (DLS) were used to characterize the products thus formed.

Faculty

Faculté des sciences et de médecine

Department

AMI - Soft Nanoscience

Language