Shalkevich, Natallia Shalkevich, Andrey Si-Ahmed, Lynda Bürgi, Thomas 2009-09-17 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. application/pdf https://folia.unifr.ch/global/documents/301286 https://folia.unifr.ch/documents/301286/files/Physical_Chemistry_Chemical_Physics_2009.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1039/b912571j info:eu-repo/semantics/openAccess License undefined Physical Chemistry Chemical Physics. - 2009, vol. 11, p. 10175-10179 info:eu-repo/classification/udc/53 Reversible formation of gold nanoparticle–surfactant composite assemblies for the preparation of concentrated colloidal solutions http://purl.org/coar/resource_type/c_6501