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Study on the Crystallization of NaF using Quartz Crystal Analyzer  

Han, Sung-Woong (Department of Chemical Engineering, Dong-A University)
Son, Se-Young (Department of Chemical Engineering, Dong-A University)
Song, Seong-Hun (Department of Chemical Engineering, Dong-A University)
Kim, Jong-Min (R&D Center, Seiko Instruments Inc.)
Kim, Woo-Sik (Department of Chemical Engineering, Kuyng-Hee University)
Muramatsu, Hiroshi (R&D Center, Seiko Instruments Inc.)
Chang, Sang Mok (Department of Chemical Engineering, Dong-A University)
Publication Information
Korean Chemical Engineering Research / v.40, no.6, 2002 , pp. 659-663 More about this Journal
Abstract
The crystallization of NaF driven by adding ethanol was monitored using quartz crystal analyzer (QCA). Adding ethanol to NaF solution reduced the solubility of NaF and consequently led to nucleation and growth of NaF crystals. To investigate the crystallization behavior of NaF, a gold electrode of QCA was modified by anchoring with 2-mercaptoethylamine hydrochloride based on a self-assembly method. Frequency of QCA varied with the amount of NaF adsorbed on the self-assembled layer of 2-mercaptoethylamine hydrochloride, and thereby the process of NaF crystallization could be analyzed indirectly by monitoring the frequency change of QCA. To change the extent of supersaruration of NaF, the amount of ethanol added to the solution was varied from 1 to 5 ml. Then, the effect of the extent of the supersaturation on the crystallization was examined by analyzing the frequency changes of QCA coated with 2-mercaptoethylamine hydrochloride. It was shown that the QCA technique could be well applied for the characterization and analysis of the crystallization behavior of NaF.
Keywords
Crystallization; NaF; QCA; Metastable; Nucleation;
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