Silver Clusters of Photographic Interest: Formation of Silver Clusters During Precipitation of Silver Bromide Emulsion Grains
Silver Clusters of Photographic Interest: Formation of Silver Clusters During Precipitation of Silver Bromide Emulsion Grains
复制标题
具有摄影价值的银簇：溴化银乳液颗粒沉淀过程中银簇的形成
DOI：
10.2352/j.imagingsci.technol.2003.47.1.art00013
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发表时间：
2003
影响因子：
1
通讯作者：
T. Tani
中科院分区：
文献类型：
--
作者：
Haruyasu Nakatsugawa;T. Tani
从反应溶液中银半电池（E Ag）电位大于明胶半电池（E Gel）电位的情况出发，研究了乳状液中agbr颗粒沉淀过程中明胶还原银离子形成银团簇的过程。制备的乳状液的敏感性与本体反应溶液的Ag无关，但随着pH值的增加而增加，达到相应的还原敏化乳状液和氢超敏化乳状液的敏感性。这些结果表明，形成的团簇是还原敏化中心。有人提出，银团簇的形成不是发生在散装反应介质中，而是发生在硝酸银水溶液被引入沉淀的区域，因为这是反应容器中银比凝胶更具正电性的唯一区域。
The formation of silver clusters due to reduction of silver ions by gelatin during precipitation process ofAgBr grains in emulsions was studied from the point of view that it should take place when the potential of the silver half-cell (E Ag ) was more positive than the potential of the gelatin half-cell (E Gel ) in a reaction solution. Although the sensitivities of the prepared emulsions were independent of E Ag of the bulk reaction solutions, they increased with increasing pH values, and reached the sensitivities of the corresponding reduction sensitized emulsions and hydrogen hypersensitized ones. These results indicate that the formed clusters were reduction sensitization centers. It is proposed that silver cluster formation takes place, not in the bulk reaction medium, but in the region into which an aqueous solution of silver nitrate has been introduced for precipitation, since this is the only region where E Ag is more positive than E Gel in a reaction vessel.