Promotion of crystal growth rate in aqueous solution by direct contact with gas corona discharge
✍ Scribed by Kouji Maeda; Noriaki Sano; Akira Sonoda; Keisuke Fukui
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 117 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0232-1300
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✦ Synopsis
Abstract
A new technique to promote crystal growth in aqueous solution using gas plasma is proposed. In this method, short‐lived radical species produced in solution which is contacted with gas corona discharge play a role to increase chemical potential of inorganic solute. In an experimental examination, single crystal of KDP was grown in a supersaturated solution which receives oxygen ions and radicals from adjacent corona discharge in air. KDP crystal has two unique growth faces (100) and (101), and the growth rates of both faces were increased considerably by generating the corona discharge. The both growth rates with and without corona discharge were well converged by one function based on chemical potential supersaturation. This result revealed that the solution in contact with gas corona discharge has a larger capacity of chemical potential than that without the discharge. Short‐lived species induced by gas corona discharge are considered to be anti‐solvents to cause this effect. The crystal growth process proposed here is considered to be an excellent method in terms of low impurity inclusion because such short‐lived species do not remain in the final crystal products and solution. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)