Synthesis of Ag nanoparticles under a contact of water solution with silver(I)chloride biopolymer matrix

Abstract

Nanoparticles of elemental silver (Ag-NP) obtaining as a result of the “re-precipitation” process of elemental silver according to scheme Ag → AgCl → Ag into biopolymer-immobilized matrices (BPIM) on the base of gelatin, has been found. On the first stage of this process, BPIM containing elemental silver, are processed with water-alkaline solutions containing KCl and K3[Fe(CN)6], on the second stage - with water-alkaline solutions containing tin(II) dichloride and organic or inorganic substance forming rather stable soluble coordination compounds with Ag(I). Some D = f(DAg) dependences where D is an optical density of “re-precipitated” silver in the matrix corresponding to initial density DAg have been presented. It has been found that a degree of influence of complex-formed substance (D/DAg) is determined with its nature as well as its concentration in “reducting” solution; besides, the most considerable this influence is in the case of ethanediamine-1,2, the least considerable one, in the case of ammonia. Besides, silver formed in gelatin matrix consists of nanoparticles and distinguished by optical and XRD parameters from initial elemental silver.