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A Package of Established Analytical Tools to Investigate the Solid-State Alteration of Lipid-Based Excipients
Published on: August 9, 2022
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Liquid dynamics in partially crystalline glycerol
Alejandro Sanz1, Kristine Niss1
1IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark.
The Journal of Chemical Physics
|February 3, 2017
Summary
Supercooled glycerol crystallization dynamics were studied using dielectric spectroscopy. The liquid dynamics remained unaffected by nucleation or crystal growth, and no peculiar phases were observed.
Area of Science:
- Materials Science
- Physical Chemistry
- Condensed Matter Physics
Background:
- Supercooled liquids exhibit complex dynamics near their glass transition.
- Understanding glycerol's crystallization is crucial for various applications.
Purpose of the Study:
- To investigate the dynamics of supercooled glycerol during its transformation into a solid phase.
- To analyze the dielectric response in real-time during glycerol crystallization.
Main Methods:
- Dielectric spectroscopy was employed to monitor the temporal evolution of the dielectric signal amplitude.
- Real-time measurements captured the crystallization process.
Main Results:
- Neither nucleation nor crystal growth visibly influenced the liquid dynamics of glycerol.
- A small fraction of glycerol remained disordered in the frustrated crystal, exhibiting dynamics similar to the bulk liquid.
- No evidence of peculiar phases, such as amorphous solid states or liquid-dispersed nanocrystals, was found.
Conclusions:
- Glycerol crystallization does not significantly alter the dynamics of the remaining liquid phase.
- The observed dynamics in the frustrated crystal suggest a preservation of bulk-like relaxation processes.
- Supercooled glycerol crystallization appears to be a straightforward transition without forming intermediate exotic phases.
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