Studies On Highly Concentrated Nanosilver Sol: Preparation, Characterization,Concentration And Scale-up

The liquid-phase chemical reduction method, introduced in this paper, isdemonstrated to be a promising way for preparing Ag nanoparticles. In terms oftechnology, it is not difficult to realize the production of nanosilver sol in industry.The key problems faced by scale-up of nanosilver sol are how to meet theconcentration requirements, how to retain the excellent performance of the silvernanocolloids produced in laboratory and how to evaluate its stability. Here, we chosewater, amine and alcohol as our solvent respectively. By preparing, characterizing,concentrating, scaling up and stability evaluating of the highly concentratednanosilver sol in aqueous and organic systems, following results were achieved:Highly concentrated nanosilver sols were prepared by liquid-phase chemicalreduction method in aqueous and organic systems. A series of reaction parametersaffecting the yield and particle size distributionof the synthesized silver nanoparticleswere investigated. Based on the results of experiments discussed, the reactionconditions for synthesis of highly concentrated nanosilver sol were optimized.The amplification synthesis course of aqueous phase nanosilver sol was studied.The main problems existed in magnification were put forward and dealt withreasonably. This experiment provided valuable theory reference and experimentalevidence for enlargeing preparing of highly concentrated nanosilver sol byconventional and cheap methods.In order to meet various concentration requirements, aqueous phase nanosilversolwas concentrated and purified by ultrafiltration.The relative stability of the nanosilver sols was characterizated by ΔBS and STIof samples. The effects of experimental conditions on stability were studied to ensurethat the sol system possess relative stability in the course of preparing, concentratingand appling.