华南理工大学学报(自然科学版) ›› 2007, Vol. 35 ›› Issue (4): 62-66.

• 化学化工 • 上一篇    下一篇

超声作用下碳酸钙晶体的形态变化

谢彩锋1 丘泰球1 陆海勤2 杨连生1   

  1. l.华南理工大学 轻工与食品学院,广东 广州 510640; 2. 绍兴文理学院 化学化工系,渐江 绍兴 321000
  • 收稿日期:2006-03-06 出版日期:2007-04-25 发布日期:2007-04-25
  • 通信作者: 谢彩锋(1976-),女,博士生,主要从事功能碳水化合物材料研究. E-mail:fcx020950101@sohu.com
  • 作者简介:谢彩锋(1976-),女,博士生,主要从事功能碳水化合物材料研究.

Morphology Variation of Calcium Carbonate Crystal Irradiated by Ultrasonic

Xie Cai-fengQiu Tai-qiuLu Hai-qinYang Lian-sheng1   

  1. 1. School of Light Industry and Food Sciences , South China Univ. of Tech , Guangzhou 510640 , Guangdong, China;2. College of Chemistry and Chemical Engineering , Shaoxing Univ. , Shaoxing , 321000 , Zhejiang , China
  • Received:2006-03-06 Online:2007-04-25 Published:2007-04-25
  • Contact: 谢彩锋(1976-),女,博士生,主要从事功能碳水化合物材料研究. E-mail:fcx020950101@sohu.com
  • About author:谢彩锋(1976-),女,博士生,主要从事功能碳水化合物材料研究.

摘要: 为了解超声场对碳酸钙晶体形态的影响,揭示其作用机制,采用自行设计的超声设备(40kHz , 0.88W/cm2 ) 来处理不同过饱和度的破酸钙溶液,并比较有、无超声作用的碳酸钙晶体的形态和大小.研究结果表明:超声空化效应所产生的微观热量不仅能促进过饱和溶液中碳酸钙晶核的形成,迅速降低溶液的过饱和度,还能改变碳酸钙晶体的形态;经超声处理的破酸钙过饱和溶液中形成了大量微小的碳酸钙晶体,其中绝大部分为文石,少量为细小方解石,它们长时间悬浮在溶液中;超声的机械效应对碳酸钙晶体形态的影响甚微.

关键词: 超声, 空化作用, 碳酸钙, 结晶

Abstract:

In order to reveal the effects of ultrasonic irradiation on the morphology of calcium carbonate and the corresponding mechanism , calcium carbonate solutions with various degrees of supersaturation were treated using a self-devised ultrasonic equipment (40 kHz , O. 88 W / cm2). The morphology and size of the calcium carbonate cry-stal with ultrasonic irradiation were then compared with those of the CIγstal without radiation. The results indicate that (1) the microcosmic energy generated by cavitation effect in the supersaturated solution accelerates the forma-tion of crystal nuclei , decreases the supersaturation degree of solution and changes the morphology of the crystal ,( 2) a large number of calcium carbonate crystaIs exist in the form of aragonite while little in the form of calcite,and the crystals suspend in the solution for a long time , and (3) the mechanical effect of ultrasonic has little effect on the morphology of calcium carbonate crystal.

Key words: ultrasonic, cavitation effect, calcium carbonate, crystallization