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Abstract: Silver bromide is widely used in photographic film which is prepared by the emulsion method using gelatin, and it is also known that the gelation assists the formation of AgBr with various shapes and sizes. In order to investigate the photocatalytic activity as one of the applications of AgBr, the preparation of shape-controlled AgBr was carried out. It is found that the emulsion method controlled by varying the concentration of gelatin and Br/Ag molar ratios was effective to improve AgBr photocatalytic activity. [Copyright &y& Elsevier]

AgBr/I nanoparticles were prepared in a gelatin colloid medium using the double-jet precipitation method. The difference in growth behaviour of AgBr/I nanoparticles in two types of gelatin, fish gelatin and bovine gelatin, was observed, and was considered to result from differences in conformation and component contents. The average size of AgBr/I nanoparticles prepared in aqueous fish gelatin solution increased with decreasing addition rate of reactants from 4.0 mmol min-1 to 1.7 mmol min-1 or increasing precipitation temperature from 30°C to 60°C. On the basis of the dependence of the growth rate of AgBr/I nanoparticles on precipitation temperature, the activation energy of the growth rate of the nanoparticles was estimated as 20.4 kJ mol-1. The protective role of 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene (TAI) for AgBr/I nanoparticles made in aqueous fish gelatin solution was explored. The results showed that TAI was adsorbed on the surface of AgBr/I nanoparticles to restrict growth and to deflocculate particles. [ABSTRACT FROM AUTHOR]