Origin of enhanced crystal growth kinetics near [T.sub.g] probed with indomethacin polymorphs

Article Abstract:

Three crystal polymorphs of indomethacin (IMC) are used to test the two interpretations of the enhanced crystal growth kinetics near the glass transition temperature [T.sub.g]. The results have concluded that the liquid dynamics of IMC controls its crystal growth kinetics over a wide range of temperatures, but changes of growth morphologies near [T.sub.g] leads to the acceleration of growth of certain polymorphs.

Crystals, Dynamics, Dynamics (Mechanics), Mechanical properties, Indomethacin, Crystal growth, Structure

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Kinetics of cross-nucleation polymorphs

Article Abstract:

The first kinetic measurement of cross-nucleation between polymorphs, a newly discovered phenomenon important to the theory and control of crystallization was reported. The kinetics of cross-nucleation was determined from the frequencies of alpha-nuclei appearing on delta spherulities, the distance between alpha and delta nuclei, and the growth rate of the spherulite.

Nucleation, Nucleation (Chemistry), Polymorphism (Crystallography)

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Measuring free-energy difference between crystal polymorphs through eutectic melting

Article Abstract:

A method is described to measure the free-energy difference, deltaG, between crystal polymorphs from their calorimetric data of eutectic melting with a common additive. The deltaG thus obtained are important for structure-stability studies and controlling crystallization in polymorphic systems.

Binding energy

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