Single- and two-step calorimetric studies of crystallization kinetics in simple ionic glass-forming liquids. 1. Ca(NO3)2-KNO3 system

H. Senapati; R. K. Kadiyala; Charles Angell

doi:10.1021/j100171a060

Single- and two-step calorimetric studies of crystallization kinetics in simple ionic glass-forming liquids. 1. Ca(NO₃)₂-KNO₃ system

H. Senapati, R. K. Kadiyala, Charles Angell

Molecular Sciences, School of (SMS)

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Abstract

Isothermal calorimetric studies of crystal nucleation and growth processes in the aqueous LiCl-H₂O system and the model glass-forming ionic system Ca(NO₃)₂-KNO₃ have been investigated. For LiCl-H₂O it is demonstrated that the results obtained by using emulsion samples, which protect against heterogeneous nucleation artifacts, can be reproduced by using bulk samples. For the Ca(NO₃)₂-KNO₃ system some interference from heterogeneous nucleation is observed, but results of character rather similar to those in LiCl-H₂O are obtained. These are refined by the use of two different two-step observation schedules which probe the relation between nucleation-dominated and growth-dominated regimes. The results make it possible to compare the crystallization kinetics in aqueous solutions and ionic melts and contrast them with molten fluoride systems of previous studies.

Original language	English (US)
Pages (from-to)	7050-7054
Number of pages	5
Journal	Journal of physical chemistry
Volume	95
Issue number	18
DOIs	https://doi.org/10.1021/j100171a060
State	Published - Jan 1 1991

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Engineering(all)
Physical and Theoretical Chemistry

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title = "Single- and two-step calorimetric studies of crystallization kinetics in simple ionic glass-forming liquids. 1. Ca(NO3)2-KNO3 system",

abstract = "Isothermal calorimetric studies of crystal nucleation and growth processes in the aqueous LiCl-H2O system and the model glass-forming ionic system Ca(NO3)2-KNO3 have been investigated. For LiCl-H2O it is demonstrated that the results obtained by using emulsion samples, which protect against heterogeneous nucleation artifacts, can be reproduced by using bulk samples. For the Ca(NO3)2-KNO3 system some interference from heterogeneous nucleation is observed, but results of character rather similar to those in LiCl-H2O are obtained. These are refined by the use of two different two-step observation schedules which probe the relation between nucleation-dominated and growth-dominated regimes. The results make it possible to compare the crystallization kinetics in aqueous solutions and ionic melts and contrast them with molten fluoride systems of previous studies.",

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AU - Senapati, H.

AU - Kadiyala, R. K.

AU - Angell, Charles

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N2 - Isothermal calorimetric studies of crystal nucleation and growth processes in the aqueous LiCl-H2O system and the model glass-forming ionic system Ca(NO3)2-KNO3 have been investigated. For LiCl-H2O it is demonstrated that the results obtained by using emulsion samples, which protect against heterogeneous nucleation artifacts, can be reproduced by using bulk samples. For the Ca(NO3)2-KNO3 system some interference from heterogeneous nucleation is observed, but results of character rather similar to those in LiCl-H2O are obtained. These are refined by the use of two different two-step observation schedules which probe the relation between nucleation-dominated and growth-dominated regimes. The results make it possible to compare the crystallization kinetics in aqueous solutions and ionic melts and contrast them with molten fluoride systems of previous studies.

AB - Isothermal calorimetric studies of crystal nucleation and growth processes in the aqueous LiCl-H2O system and the model glass-forming ionic system Ca(NO3)2-KNO3 have been investigated. For LiCl-H2O it is demonstrated that the results obtained by using emulsion samples, which protect against heterogeneous nucleation artifacts, can be reproduced by using bulk samples. For the Ca(NO3)2-KNO3 system some interference from heterogeneous nucleation is observed, but results of character rather similar to those in LiCl-H2O are obtained. These are refined by the use of two different two-step observation schedules which probe the relation between nucleation-dominated and growth-dominated regimes. The results make it possible to compare the crystallization kinetics in aqueous solutions and ionic melts and contrast them with molten fluoride systems of previous studies.

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Single- and two-step calorimetric studies of crystallization kinetics in simple ionic glass-forming liquids. 1. Ca(NO₃)₂-KNO₃ system

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