THE SENSITIZATION OF SILVER BROMIDE EMULSION WITH CROWN COMPOUND

doi:10.7517/j.issn.1674-0475.1992.03.284

Imaging Science and Photochemistry ›› 1992, Vol. 10 ›› Issue (3): 284-288.DOI: 10.7517/j.issn.1674-0475.1992.03.284

THE SENSITIZATION OF SILVER BROMIDE EMULSION WITH CROWN COMPOUND

Fu YU-HUA¹, ZHOU BEN-MAO¹, ZHANG CHEN-GONG¹, LI XIAO-LING¹, REN XIN-MIN¹, YANG JI-QIU², HU PEI-BIN², QIN YONG², LUO SHI-QIONG², LI SHENG-JIAN²

1. Institute of Photographic Chemistry, Academia Sinica, Beijing 100101, P. R. China;
2. Institute of Organic Chemistry, Academia Sinica, Chengdu 610015, P. R. China

Received:1991-09-03 Revised:1992-04-20 Online:1992-08-20 Published:1992-08-20

Abstract

Abstract: In the present work, it was found that N-toluensulfonyl-7-aza-1, 4, 10, 13-te-trathiacyclohexadecane (NTsTTH) can sensitize AgBr emulsion and the sensitivity-can be increased from 3 to 12.5. The growth of AgBr crystals under the action of NTsTIH was studied with transmitance electron microscopy (TEM), and it was found that NTsTTH acts as a modifier in crystals growth. The ionic conductivity of AgBr emulsion sensitized with NTsTTH decreases with increasing amount of NTsTTH. When excess NTsTTH was added to the emulsion, fog was significantly-increased. According to the results, a hypothetical sensitization mechanism was suggested: when NTsTTH is added to the emulsion, it will combine with the positively charged kink sites (Ag⁺) on the silver bromide microcrystal forming complex (1) which is possible to become sensitization centers. During this process (1) a disproportionate reaction may occur (2) Ag⁺ + NTsTTH——Ag(NTsTTH)⁺ (1) 2Ag⁺ + NTsTTH——Ag(NTsTTH)²⁺ + Ag° (2) and the Ag atoms may aggregate to form fog centers or reduction sensitization centers.

Key words: photographic emulsion, sensitivity, modifier

Fu YU-HUA, ZHOU BEN-MAO, ZHANG CHEN-GONG, LI XIAO-LING, REN XIN-MIN, YANG JI-QIU, HU PEI-BIN, QIN YONG, LUO SHI-QIONG, LI SHENG-JIAN. THE SENSITIZATION OF SILVER BROMIDE EMULSION WITH CROWN COMPOUND[J]. Imaging Science and Photochemistry, 1992, 10(3): 284-288.

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THE SENSITIZATION OF SILVER BROMIDE EMULSION WITH CROWN COMPOUND

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