Reversible formation of gold nanoparticle-surfactant composite assemblies for the preparation of concentrated colloidal solutions.
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.
Université de Neuchâtel, Institut de Physique, Laboratoire de chimie physique des surfaces, Rue Emile-Argand 11, 2009 Neuchâtel, Switzerland.
Natallia
N
Shalkevich
Andrey
A
Shalkevich
Lynda
L
Si-Ahmed
Thomas
T
Bürgi