内灰化八面体核壳乳剂的制备方法对微晶结构与性能的影响

应用双注仪制备了碘含量１．５％的ＡｇＢｒＩ乳剂，在一定温度，ｐＡｇ和ｐＨ下将乳剂成熟到一定程度（Ｄ０＞５．０）。用此乳剂做为核，采用二次乳化法包壳。本主要研究了包壳时ｐＨ值，壳的组成，厚度对乳剂颗粒大小、形状、显影密度及离子电导的影响。结果表明：（１）当壳的组成为ＡｇＢｒＩ时，随氯含量增加（分别为０、２．５、５、１０％ｍｏｌ），核壳乳剂表显密度变化不大而内显密度上升；（２）包壳时随ｐＨ由低到高（

THE INFLUENCES 0F PREPARATION METHOD ONSTRUCTURE AND PROPERTIES OF INTERNALLY FOGGED CORE-SHELL EMULSION

A AgBrI emulsion was prepared by pAg-controlled double jet methods. Reductionsensitization was performed by silver digestion at low pAg values and high pH values(D_o>5.0),them more AgBr was precipitated on to the digested emulsion by the same double-jet procedure at defferent pH values(pH 2,4,6,8).The influence of the method of preparation on the structure and the properties of AgX microcrystals was studied in the PaPer.It was shown that with pH changes during shell-formation grain size increase,thecrystal shape was transformed from regular octahedal to rouned octahedral,and thedensity by surface development and the ionic conductivity increase but density by internal development decrease.At the same pH,the density by surface development was downrapidly with the change of the core-shell ratio of 1:0.5,1:1,1:2,1:3.