The beta-alpha branching in D-sorbitol as studied by thermally stimulated depolarization currents (TSDC)

Article Abstract:

A study was conducted to investigate the molecular motions in D-sorbitol by thermally stimulated depolarization currents (TSDC) in the temperature region between -160 and 10 degree Centigrade. The result reveals that the beta relaxation in D-sorbitol appears to be strongly overlapped with the alpha relaxation in the temperature range between -60 and -15 degree Centigrade and does not show any sign of structuration.

Molecular dynamics, Polarization (Electricity)

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Dielectric study of the slow motional processes in the polymorphic states of anhydrous caffeine

Article Abstract:

The dynamic disorder in the crystalline phases of anhydrous caffeine is studied using the dielectric technique of thermally stimulated depolarization currents (TSDC). The experimental results suggest that both crystalline phases II and I of caffeine, that have distinct crystal structures, are solid rotator phases showing reorientational glass transition at the same temperature in phase II and in metastable phase I.

Analysis, Relaxation phenomena, Relaxation (Physics), Structure, Chemical properties, Ionic crystals

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Plastic and glass crystal states of caffeine

Article Abstract:

A study focuses on high temperature form I of caffeine and on its low temperature metastable form. The high temperature phase (I) of caffeine is in a state of dynamically orientationally disordered crystalline state, which is also called the plastic phase, and the metastable state I enters into a nongerodic unstable state, which is called the glassy crystal state.

Thermal properties, Transition state (Chemistry)

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