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标题：Plasmochemical preparation of silver nanoparticles: thermodynamics and kinetics analysis of the process
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作者：Margarita Skiba ; Alexander Pivovarov ; Anna Makarova 等
期刊名称：Eastern-European Journal of Enterprise Technologies
印刷版ISSN：1729-3774
电子版ISSN：1729-4061
出版年度：2018
卷号：2
期号：6
页码：4-9
DOI：10.15587/1729-4061.2018.127103
语种：English
出版社：PC Technology Center
摘要：The thermodynamics and kinetics analysis of the plasmochemical formation of silver nanoparticles is performed. The thermodynamics analysis is made on the basis of calculation of the Gibbs free energy of formation of silver nanoparticles in an aqueous medium by various methods. It was found that the Gibbs free energy in aqueous solutions increases with decreasing size of silver particles. Based on experimental data, it was determined that the average size of plasmochemically prepared particles depends on the initial concentration of silver ions in the solution and equals 36.5–60.1 nm for 0.25–3.0 mmol/l.The kinetics of chemical conversion in aqueous solutions of silver nitrate under plasma treatment conditions in a gas-liquid plasmochemical batch reactor is investigated. The curves of Ag+ dependence on duration of plasmochemical treatment of solutions and initial concentration of silver ions are given. It is found that the process of plasmochemical formation of silver nanoparticles is the second-order reaction. The rate constant of formation of silver nanoparticles is k=0.07–1.53 mol-1∙dm3∙min-1 depending on the initial concentration of silver ions. It is shown that the formation of silver nanodispersions under plasma discharge impact is characterized by the presence of the peak λmax=400–440 nm.
关键词：low-temperature plasma;discharge;formation;process;Gibbs free energy;thermodynamic potential;Nernst equation;rate constant