Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Synthesis of stable dispersion of copper nanoparticles in a water-in-supercritical carbon dioxide using polydimethylsiloxane as the stabiliser
Ist Teil von
Journal of experimental nanoscience, 2012-05, Vol.7 (3), p.243-253
Ort / Verlag
Taylor & Francis Group
Erscheinungsjahr
2012
Link zum Volltext
Quelle
Taylor & Francis Journals Auto-Holdings Collection
Beschreibungen/Notizen
This study reportes the synthesis of stable dispersion copper nanoparticles by chemical reduction of copper chloride (CuCl
2
) in a water-in-supercritical carbon dioxide medium using sodium borohydrate (NaBH
4
) as a reducing agent, polydimethylsiloxane as the stabiliser and sodium bis(2-ethylhexyl)sulphosuccinate (AOT) as co-surfactant at temperature 40°C and pressure in the range 2000-2400 psi. UV-visible spectroscopy exhibits a typical emission peak at 560-590 nm for Cu nanoparticles. By changing the reaction pressure and the stabiliser concentration, the size and the shape of the copper nanoparticles could be easily controlled. The X-ray diffraction pattern reveals that the Cu nanoparticles are formed in the range 4-8 nm, which is consistent with the transmission electron microscopy images.