Growth and dissolution kinetics of cyanazine crystals in aqueous ethanol solutions

• Published in: Journal of crystal growth 1997-03, Vol.172 (3), p.499-507
• Main Authors: Hurley, Liam A., Jones, Alan G., Drummond, Jeremy N.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Growth from solutions; Materials science; Methods of crystal growth; physics of crystal growth; Physics; Solid-fluid interfaces; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)
• ISSN: 0022-0248; 1873-5002
• DOI: 10.1016/S0022-0248(96)00715-4

Dissolution and overall growth rates of cyanazine crystals in aqueous ethanol solutions in a batch agitated vessel are reported. Preliminary results indicate that with increasing water weight fraction, X, and temperature, respectively, the overall crystal growth rate increases and the process becomes more influenced by diffusion. Values for the overall growth order lie in range g = 1.5−2.8 at an initial supersaturation ratio of S = 3 and X = 0.70−0.95. Results obtained from optical video microscopy in a single crystal growth cell show that there is a change in the surface integration mechanism from layer by layer adsorption to screw dislocation over the water weight fraction range X = 0.95−0.75. SEM analysis gives further support to these observations showing the presence of growth spirals on crystals produced at water weight fractions in the range X = 0.70−0.85.