超重力场中微细晶须碳酸钙结晶过程及产品稳定性研究  

ON THE CRYSTAL PROCESS AND PRODUCT STABILITY OF THE ULTRAFINE CALCIUM CARBONATE WHISKERS IN HIGH_GRAVITY FIELD

作　　者：朱万诚[1] 陈建峰[2] 王玉红[2] 

机构地区：[1]曲阜师范大学化工系,山东省曲阜市273165 [2]教育部超重力工程研究中心

出　　处：《曲阜师范大学学报（自然科学版）》2003年第4期77-81,共5页Journal of Qufu Normal University(Natural Science)

基　　金：国家自然科学基金项目 (2 0 2 3 60 2 0 );北京市新星计划资助项目 (95 5 810 3 5 0 0 );新加坡纳米材料科技公司资助项目

摘　　要：在旋转填充床转子高速旋转产生的超重力场中 ,以MgCll2 或H3PO4 为晶形控制剂合成微细晶须碳酸钙 ,通过反应过程中pH值的变化以及针状晶种存在与否两种情形下晶体形貌的演变对结晶过程进行了研究 ,同时对产品粒子的稳定性进行了初步探讨 .结果表明 ,无晶种存在时 ,微细晶须碳酸钙晶形的形成需要经历不规则外形—类纺锤形—晶须状—微细晶须状 4个阶段 ;有晶种存在时 ,产品粒子倾向于在其表面或周围成核 ,最终所有粒子短轴与长径比趋向均匀 ;The crystal process of the ultrafine whiskers of calcium carbonate, wh ich were successfully synthesized in high_gravity field generated by the rotatin g packed bed (RPB) in presence of MgCl 2 or H 3PO 4 used as the morphology_co ntrol additive, was studied through the change of pH and evolvement of crystal form du ring the crystallization under conditions of needle_like crystal seeds existing and not. Meanwhile, the stability of the product particles was discussed briefly . The results show that the formation of the crystal shape of ultrafine whiskers of calcium carbonate consists of four steps, which comes along with the anomalou s shape, spindle_like shape, whisker and ultra_fine whisker without crystal seed s. While the product particles tend to nucleate on the surface or near to the cr ystal seeds added into the solution ahead of time, and both the short shaft and the aspect ratio of the obtained particles trend are even. Besides, th e ultrafine whiskers of calcium carbonate show excellent form stability in the c ircumstances of aging or drying and disperse stability in the aqueous media.

关 键 词：超重力场 晶须材料 晶须碳酸钙 结晶过程 稳定性 表面形貌 晶形控制 

分 类 号：TQ132.32[化学工程—无机化工]