title: Fast and cost-effective purification of gold nanoparticles in the 20-250 nm size range by continuous density gradient centrifugation.
abstract: A multilayer quasi-continuous density gradient centrifugation method for separating 20-250 nm metal colloids with high size resolution while maintaining particle stability is presented. Colloidal mixtures containing monodisperse gold nanospheres and clusters thereof, in particular, gold dimers, are purified with yields up to 94%. The rapid method uses standard laboratory equipment.
authors.affiliation: Department of Physics, University of Osnabrück, 49069 Osnabrück, Germany.
authors.forename: Dennis
authors.initials: D
authors.lastname: Steinigeweg
authors.forename: Max
authors.initials: M
authors.lastname: Schütz
authors.forename: Mohammad
authors.initials: M
authors.lastname: Salehi
authors.forename: Sebastian
authors.initials: S
authors.lastname: Schlücker
mesh_terms: D002499:Centrifugation, Density Gradient / Q000191:economics / Q000379:methods*; D003102:Colloids / Q000737:chemistry; D003362:Cost-Benefit Analysis; D006046:Gold; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D012822:Silicon Dioxide; D013997:Time Factors
chemical_list: D003102:Colloids; D006046:Gold; D012822:Silicon Dioxide