A Study on Structure and Energy State of J- aggregates of Dyes Adsorbed by AgBr Grains on the Basis of Analysis on Their Desorption Process from the Grains by Use of an Adsorbent for the Dyes

Abstract

Desorption process of J- aggregates of sensitizing dyes from AgBr grains in emulsions was investigated by use of a macroporous cross-linked polystyrene resin as an adsorbent for the dyes. The desorption rate did not depend on the residual dye concentration on the grain surface. The increase in the size of J- aggregates formed on AgBr grains caused a) the decrease in the desorption rate, b) increase in the activation energy for the desorption, and c) increase in the heat of adsorption of the dyes to the grains. These results supported the mechanism of the growth of J- aggregates of dyes through the repetition of the desorption and adsorption processes, as proposed in the previous paper.