Crystallization of Complexes Characterized with Streaming Potential Measurement

• Published in: Journal of chemical and engineering data Vol. 55; no. 4; pp. 1473 - 1476
• Main Authors: Wang, Jian, Ma, Wei-xing, Yin, Fu-jun, Xu, Xing-you, Lu, Lu-de, Yang, Xv-jie, Wang, Xin, Zang, Yun-long, Lin, En-wei
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 08.04.2010
• Subjects: Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Iron Complexes; Hexacyanoferrates; Valence; Supersaturated solution; Crystallization; Electrokinetics; Solubility; Potassium Compounds; Physicochemical properties; Flow potential
• ISSN: 0021-9568; 1520-5134
• DOI: 10.1021/je900098q

The streaming potential of supersaturated solutions of K3[Fe(CN)6] and K4[Fe(CN)6] was determined to characterize crystallization under declining temperature conditions. The value of the streaming potential was related to the oxidation state of the iron atom in the complex, the solubility of the complex, and the starting temperature of crystallization. It was easily influenced by the thermal influence, the polarization of the electrode, the hydrolyzation of the complex, and the rate of the temperature decline. When the temperature dropped to the point where crystal nuclei appeared, the streaming potential reached a minimum. Thereafter, as the number of crystal nuclei increased, some minicrystals grew, and the streaming potential presented a tendency to increase. The higher the starting temperature of the complex saturated solution is, the higher temperature corresponding to the value of the streaming potential minimum is. The temperature of the streaming potential minimum in the K3[Fe(CN)6] supersaturated solution is lower than that in the K4[Fe(CN)6] supersaturated solution.