Investigation on nucleation kinetics of urea–thiourea mixed crystal (UTMC) in methanol and absolute alcohol

Autor:	M. Mariappan, G. Madhurambal, G. Selvarajan, S. C. Mojumdar
Rok vydání:	2015
Předmět:	Induction period Nucleation Analytical chemistry Alcohol Condensed Matter Physics Gibbs free energy chemistry.chemical_compound symbols.namesake Crystallography Thiourea chemistry symbols Critical radius Methanol Physical and Theoretical Chemistry Solubility
Zdroj:	Journal of Thermal Analysis and Calorimetry. 119:931-938
ISSN:	1588-2926 1388-6150
DOI:	10.1007/s10973-014-4249-6
Popis:	The induction period of various proportions of urea–thiourea mixed crystal (UTMC) in methanol and absolute alcohol has been measured experimentally by the visual observation method. It decreased from 0.1 to 0.5 UTMC and then slightly increased from 0.66 to 0.9 UTMC. The solubility of various proportions of UTMC was determined. It decreases with increase in proportions of thiourea. The induction period, which is inversely proportional to the nucleation rate, has been used to estimate the interfacial tension between the UTMC and methanol, absolute alcohol, hence the nucleation parameters like critical radius (r*), number of molecules in the radius (r*) and Gibbs free energy change for the formation of a critical nucleus (∆G*) have been calculated. The ∆G* of UTMC in methanol was lower than absolute alcohol. The morphologies in all proportions of UTMC are completely changed.
Databáze:	OpenAIRE
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