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硒与硫的原子结构和化学性质极为相似,具有很好的化学增感性能。柯达和小西六公司先后对硒在化学增感中的应用进行了较为详细的探讨,现分别简述如下: 一、柯达公司该公司研究了硒—金协合增感,据报导只有不稳定硒,如胶态硒、有机硒化物(异硒氰酸盐、硒脲、硒酮、硒代酰胺、硒代羧酸及其酯类)、硒醚、硒磷酸酯等,才能获得较好的增感效果。但硒增感的稳定性差,灰雾高,实用中必须添加适当的稳定剂或防灰雾剂。其中含50％以上克分子氯化银的各种卤化银乳剂,可用3-吡唑酮作稳定剂,能
Se atomic structure and chemical properties of sulfur are very similar, with good chemical sensitivities. Kodak and Little West Six companies have selenium in the chemical sensitization of the application were discussed in more detail, are summarized as follows: First, Kodak Company The company studied selenium - gold synergistic sensitization, reportedly only unstable selenium , Such as colloidal selenium, organic selenide (iso-selenocyanate, selenourea, selenone, selenoamide, selenocarboxylic acid and its esters), selenium ether, selenium phosphate, etc., in order to get a better increase Feeling effect. However, the stability of selenium sensation is poor, high fog, the practical need to add an appropriate stabilizer or anti-fog agent. Among them, various silver halide emulsions containing more than 50% of molecular silver chloride are available as 3-pyrazolone stabilizer,