title: Development of catalytically active silver colloid nanoparticles stabilized by dextran.
abstract: Colloidal silver nanoparticles (Ag-NPs) with a mean diameter of 6.1 nm and a narrow size distribution were prepared by reduction of the correspondent metal salt with injection of NaBH(4), in the presence of dextran, and characterized by UV-vis, TEM, and DLS. The concentration of all reactants involved in the formation of the nanoparticles was optimized with the use of a new multivariate method, which revealed a significant reduction in the number of experiments when compared with the vast majority of univariate methods described in the literature. The Ag-NPs-dextran composite was able to efficiently catalyze the p-nitrophenol reduction in water by NaBH(4) with a rate constant normalized to the surface area of the nanoparticles per unit volume (k(1)) of 1.41 s(-1) m(-2) L, which is higher than values ever reported for Ag-NPs catalytic systems.
authors.affiliation: LaCBio - Laboratory of Biomimetic Catalysis, Chemistry Department, Federal University of Santa Catarina, Campus Trindade, Florianópolis - Santa Catarina 88040-900, Brazil.
authors.forename: Renato
authors.initials: R
authors.lastname: Eising
authors.forename: Aline M
authors.initials: AM
authors.lastname: Signori
authors.forename: Sébastien
authors.initials: S
authors.lastname: Fort
authors.forename: Josiel B
authors.initials: JB
authors.lastname: Domingos
mesh_terms: D001894:Borohydrides / Q000737:chemistry; D002384:Catalysis; D003102:Colloids / Q000138:chemical synthesis / Q000737:chemistry; D003911:Dextrans / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D001894:Borohydrides; D003102:Colloids; D003911:Dextrans; D012834:Silver; C025364:sodium borohydride