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无机材料学报

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PAA与PBTCA对CaCO3显微结构的影响

杨庆峰1; 顾安忠1; 刘阳桥2; 曾华荣2; 丁洁3; 沈自求3   

  1. 1. 上海交通大学动力与能源工程学院, 上海 200030; 2. 中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室, 上海 200050; 3. 大连理工大学化学工程研究所, 大连 116012
  • 收稿日期:2001-04-18 修回日期:2001-05-14 出版日期:2002-05-20 网络出版日期:2002-05-20

Effects of PAA and PBTCA on CaCO3 Micro-Structure

YANG Qing-Feng1; GU An-Zhong1; LIU Yang-Qiao2; ZENG Hua-Rong2; DING Jie3; SHEN Zi-Qiu3   

  1. 1. Institute of Refrigeration and Cryogenics; Shanghai Jiao Tong University; Shanghai 200030; China; 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 3. Institute of Chemical Engineering, Dalan University of Technology, Dalian 116012, China
  • Received:2001-04-18 Revised:2001-05-14 Published:2002-05-20 Online:2002-05-20

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摘要： 利用扫描电镜(ＳＥＭ)和原子力显微镜(ＡＦＭ)研究了分散剂ＰＡＡ与ＰＢＴＣＡ对ＣａＣＯ ３显微结构的影响．结果表明,与ＰＡＡ相比,ＰＢＴＣＡ对ＣａＣＯ３的沉积形貌具有更大的影响．ＳＥＭ表明,在两种分散剂的存在下,沉积物的形貌皆发生了变化,随着阻滞影响增大,沉积物晶型畸变程度随之严重,沉积物形貌的分维值也随之增大．ＸＲＤ分析表明,随着阻滞影响增大,ＣａＣＯ３晶相中球霰石的含量增大．在分散剂存在下,热力学上属亚稳态的文石和球霰石从动力学上被稳定住了．ＡＦＭ研究表明,随着阻滞影响增大,ＣａＣＯ３晶体表面上台阶间距变大．同时,发现了ＣａＣＯ３晶体表面台阶的聚并现象并进行了讨论．

关键词: 分散剂, 碳酸钙, 分形, AFM

Abstract: The effects of two dispersant, polyacrylic acid (PAA) and 2-phosphonobutane-1,2, 4-tricarboxylic acid (PBTCA), on the calcium carbonate microstructure were studied
by using SEM and AFM. XRD analysis demonstrates that the content of vaterite increases with the increase in inhibition effects. The metastable crystal forms
of vaterite and aragonite are stabilized kinetically in the presence of dispersants. The fractal analysis result shows that the fractal dimension is higher in the presence
of dispersants. The better the inhibition effect, the higher the fractal dimension. The step morphology observed by AFM images shows that the step space on the CaCO3
surface increases in the presence of dispersants. Moreover, with the increase of inhibition effect, both the step space and fractal dimension increase. Step bunching
was found on the CaCO3 crystal surfaces by AFM and discussed.

Key words: dispersant, calcium carbonate, fractal, AFM

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