金在直接正性乳剂中的作用  

THE EFFECTS OF GOLD IN THE PRE-FOGGING PROCESS OF DIRECT POSITIVE EMULSIONS

作　　者：夏云勇[1] 庄思永[1] 刘凤山[1] 

机构地区：[1]化工部第二胶片厂研究所,华东理工大学精细化工研究所

出　　处：《感光科学与光化学》1996年第4期325-330,共6页Photographic Science and Photochemistry

基　　金：国家自然科学基金

摘　　要：直接正性乳剂预灰化时，金有重要作用，本文使用在灰化结束后加入卤化银溶剂的方法研究金在灰化过程中作用，并交替应用金浴增强灰雾中心，再用氰化钠浴选择性地除去灰雾中心的金、研究金与灰雾中心的作用，实验表明，在灰化过程中加入金可以影响灰雾中心大小分布；当乳剂层内还原剂量大时，沉积反应是主要反应，而当乳剂层内的剂量少时，置换反应是主要反应，直接正怀乳剂还原灰化时。Gold plays a very important rule in the pre-fogging process of the direct positive emulsion. In this paper the effects of gold on the formation of fog centers were studied by adding silver halide solvents after the emulsions were fogged by thiourea dioxide and thiourea dioxide plus gold, respectively. The interaction between the gold and the fog centers was studied by alternatively immersing in the gold bath and sodium cyanide bath. The results indicate that the presence of gold when fogged can make the fog center size distribution narrow. It is also shown that the deposition of gold is the main reaction when there are plenty of reduction agent in the emulsion layer and the replacement of silve atomes by gold may become important when there is short of reduction agent.When the direct positve emulsion is pre-fogged,the reduction of gold ions and the deposiotion of gold onto the fog centers is the main reaction, because there is plenty of reduction agent.

关 键 词：正性乳剂 灰化 金 照相乳剂 感光材料 

分 类 号：TQ575.21[化学工程—精细化工]