Simulation of the precipitation of silver bromide photographic emulsions

✍ Scribed by Geoffrey Margolis; Edgar B. Gutoff

• Publisher: American Institute of Chemical Engineers
• Year: 1974
• Tongue: English
• Weight: 816 KB
• Volume: 20
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690200306

✦ Synopsis

Abstract

Nucleation and crystal growth processes involved in the batch precipitation of photographic emulsions by the addition of silver nitrate to an aqueous solution of bromide and gelatin have been reasonably successfully modeled. Simulation predicts the known increase in average crystal size with increased addition time, with increased temperature, and with increased halide levels. Solubility is related to crystal size by the Gibbs‐Thomson equation. The predicted decrease in the number of crystals during the course of precipitation is similar to published data, but there are quantitative differences. The model is very sensitive to variations in the constant in the growth equation, but not to variations in the constants in the nucleation equation.