caa a22 4500 445388552 CHVBK 20180317143039.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s11144-011-0352-x doi (NATIONALLICENCE)springer-10.1007/s11144-011-0352-x Kinetics at the nanoscale: formation and aqueous oxidation of copper nanoparticles [Elektronische Daten] [M. Alsawafta, S. Badilescu, M. Packirisamy, Vo-Van Truong] A simple method to prepare copper nanoparticles under the ambient atmosphere, in an aqueous environment, is developed utilizing solid sodium borohydride as the reducing agent and sodium citrate as a stabilizer and complexing agent. This constitutes a model system having a stability of several hours, sufficient to allow kinetic measurements. The localized surface plasmon resonance band of copper nanoparticles in the UV-Vis spectrum is used to determine the rate of formation of copper nanoparticles and assess the beginning of the oxidation process. The effect of temperature, copper sulfate and sodium borohydride concentrations on the copper nanoparticle formation rate is investigated. It is found that the kinetic data obey a first order rate law with respect to both sodium borohydride and copper sulfate. Based on the kinetic data, a novel mechanism of the reduction reaction is envisaged, involving three possible pathways. As solid sodium borohydride is an important hydrogen storage material, the results of this work are relevant to the field of portable fuel cells. The optical properties of copper nanoparticles have been simulated by using the Discrete Dipole Approximation method and the Mie theory and a good agreement was found between the theoretical and experimental characteristics of the copper plasmon band. The data obtained in this work provide valuable information on the kinetics of reactions at the nanoscale. Akadémiai Kiadó, Budapest, Hungary, 2011 Cu nanoparticles nationallicence Rate of formation nationallicence Sodium borohydride nationallicence Cu LSPR nationallicence DDA simulation nationallicence Alsawafta M. Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut Badilescu S. Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut Packirisamy M. Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut Truong Vo-Van Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 104/2(2011-12-01), 437-450 1878-5190 104:2<437 2011 104 11144 https://doi.org/10.1007/s11144-011-0352-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-011-0352-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alsawafta M. Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut NATIONALLICENCE 700 1- Badilescu S. Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut NATIONALLICENCE 700 1- Packirisamy M. Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut NATIONALLICENCE 700 1- Truong Vo-Van Concordia University, 1455 de Maisonneuve Blvd. W, H3G 1M8, Montréal, QC, Canada aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 104/2(2011-12-01), 437-450 1878-5190 104:2<437 2011 104 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer