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The validity of turbidimetric and scattered light measurements for the study of silver halide particle size and course of growth

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Summary

A study has been made by turbidity and scattered light measurements of some silver halide dispersions prepared in gelatin solutions in the presence and absence of small additions of a restrainer (adenine) and a sensitiser (thiosulphate).

It has been demonstrated that the combined effect of the presence of adenine and thiosulphate, in the quantities used for this work which are such that their effects are in the range of normal active and restrained gelatins, could give rise to entirely misleading results with turbidity ripening tests. This results from the complex polydisperse suspensions produced by the effects of these substances.

The behaviour of adenine (restrainer) was consistent with a simple growth restraining function whilst that of thiosulphate (sensitiser) may be explained in terms of restraining action of a transitory nature.

The work serves to illustrate the point that a single measure of particle size can give no indication of the distribution from which it is derived. Moreover it gives no idea of the processes by which the distribution was produced, even if the underlying assumption of their relevance to the photographic behaviour of the gelatin is accepted.

Zusammenfassung

Es wurden Silberhalogeniddispersionen mit Trübung- und Lichtstreuungsmessungen untersucht, die aus Gelatinelösungen in Gegenwart bzw. Abwesenheit von Adenin als Hemmstoff und von Thiosulfat als Sensibilisator hergestellt worden waren. Adenin hemmt das Kristallwachstum gleichmäßig, während die Sensibilisatorwirkung des Thiosulfats in einer vorübergehenden Hemmung liegt.

Infolge der gemeinsamen Wirkung von Adenin und Thiosulfat während der Reifeprozesse, die zu stark polydispersen Systemen führte, kann man aus Trübungsmessungen völlig irreführende Ergebnisse erhalten.

Die Arbeit hebt hervor, daß Folgerungen aus Trübungsmessungen in Hinblick auf die photographische Aktivität der Gelatine zu Fehlschlüssen führen können.

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  1. B. E. Tabor & D. R. Nellist

    Present address: The Research Laboratory, Kodak Limited, Wealdstone, Harrow, Middlesex, England

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    1. B. E. Tabor
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    2. D. R. Nellist
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    Tabor, B.E., Nellist, D.R. The validity of turbidimetric and scattered light measurements for the study of silver halide particle size and course of growth. Kolloid-Z.u.Z.Polymere 224, 134–150 (1968). https://doi.org/10.1007/BF01533971

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