Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (4): 62-66.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Morphology Variation of Calcium Carbonate Crystal Irradiated by Ultrasonic

Xie Cai-feng1  Qiu Tai-qiu1  Lu Hai-qin2  Yang 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.

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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