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Volume: 43 | Article ID: art00011
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Crystal Habit and Rounding of Cubic Silver Bromide Grains
  DOI :  10.2352/J.ImagingSci.Technol.1999.43.1.art00011  Published OnlineJanuary 1999
Abstract

The results of two analytical procedures, viz., percent cubicity by dye adsorption and supersphere roundness index, Q , by electron image analysis (electron microscopy) were compared for a series of cubic AgBr emulsions. A linear, least square, correlation, % cubicity = -110.7 Q + 99.96, was obtained in the range 0.25 < Q < 0.65. The zwitterionic dye, 3-ethyl, 3'-(3-sulfo-butyl)-9- methyl-thiacarbocyanine, as used in the cubicity test, adsorbs on rounded AgBr cubes either as single molecules or as J-aggregates.When cubes are slightly or moderately rounded, the demarcation of these two modes of adsorption can be identified with a “tilt” of the grain surface between 9° and 13°: only small deviations from the {100} crystal habit suffice to cause the dye to adsorb as J-aggregates.

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Hans Coll, R. E. Button, "Crystal Habit and Rounding of Cubic Silver Bromide Grainsin Journal of Imaging Science and Technology,  1999,  pp 85 - 88,  https://doi.org/10.2352/J.ImagingSci.Technol.1999.43.1.art00011

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