Title
Determination of the silver sulphide cluster size distribution via computer simulations Determination of the silver sulphide cluster size distribution via computer simulations
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
bookPart
Publication
[*]
Subject
Physics
Engineering sciences. Technology
Source (book)
International Symposium on Silver Halide Imaging : Silver Halide in a New Millennium, September 11-14, 2000, St Adele, Canada
ISBN
0-89208-229-1
ISI
000183315900021
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Addition of a labile sulphur donor to light sensitive silver halide microcrystals results in the formation of a distribution of silver sulphide clusters on the crystal surface. These silver sulphide clusters enhance the efficiency of image formation during the photographic process. Their activity towards the capturing of light photons, however, is very critical to their size (aggregation number) and concentration. By incorporating gold ions into silver sulphide clusters it was possible to monitor the size distribution by measuring the amount of gold reacted. From these experiments, no evidence was found for aggregation of the reacted sulphur entities on the surface. The uptake of gold ions at different sulphur concentrations could well be fitted with a simulated size distribution when a catalyzed deposition of sulphur was assumed, with a reactivity of the surface equal to 1.0 % for the microcrystals studied. From a simulation of the silver sulphide cluster size distribution a correlation could also be found between increasing aggregation numbers and the absorption at increasing wavelengths in diffuse reflectance spectroscopy.
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