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卤素转换乳剂
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     A study on the converted halide photographic emulsion
     卤素转换感光乳剂的研究
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     Determination of Halogen Ratioin Emulsion for Lithographic Film
     印刷片乳剂卤素比的测定
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     Transforming Bridge
     转换
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     code switching
     语码转换
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     Studies of febuprol emulsion
     非布丙醇乳剂的研究
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Several silver chloride emulsions were prepared under different pAg values. In thepresence of KBr solution at certain concentration, the chloride ions in the emulsion wouldconvert to bromide. Based upon the sensitometric characteristics determined for thoseemulsions, the sensitivity would decrease and the contrast coefficient would increase as thepAg value was lowered. The kinetics of the halide conversion reaction has been studied by electrochemical me-thod. The results obtained show that the halide conversion...

Several silver chloride emulsions were prepared under different pAg values. In thepresence of KBr solution at certain concentration, the chloride ions in the emulsion wouldconvert to bromide. Based upon the sensitometric characteristics determined for thoseemulsions, the sensitivity would decrease and the contrast coefficient would increase as thepAg value was lowered. The kinetics of the halide conversion reaction has been studied by electrochemical me-thod. The results obtained show that the halide conversion reaction belongs to the type ofautocatalytic reaction with an induction period, the reaction order is about 3.0 and theactivation energy of the reaction is 3. 68×10~4-4. 56×10~4 J/mol as the pAg value beingwithin the range of 5. 0-7. 5. The influence of gelatin on the halide conversion reaction has been studied as well.The gelatin would retard the conversion and the effects would be more amplified as theamount of gelatin is increased; of course, the reaction becomes more complicated under thelatter conditions.

在不同pAg下制备氯化银乳剂,在一定浓度的溴化钾溶液下进行卤素转换。随着pAg的降低,卤素转换乳剂的感光度有所下降,反差系数则增长。实验证明转换反应属自动催化反应类型,并具有诱导阶段。当pAg在5.0—7.5范围内,反应级数均在3.0左右。而活化能为3.68×10~4—4.56×10~4J/mol。因此,pAg的变化对转换反应的动力学性质无明显影响。本文还研究了明胶含量对卤素转换过程的影响,随着明胶含量的增加,反应的阻碍作用增大,反应亦趋复杂。

 
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