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Alteration of polymorphic selectivity through different crystallization mechanisms occurring in the same

Mingcan Xu, Kenneth D M Harris

    The Journal of Physical Chemistry. B
    |July 14, 2007
    PubMed
    Summary
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    Different crystallization methods in the same experiment yield distinct glycine polymorphs. Bulk crystallization produces alpha-glycine, while thin-film evaporation yields stable gamma-glycine with unusual morphology.

    Area of Science:

    • Crystallization Science
    • Materials Science
    • Chemical Engineering

    Background:

    • Polymorphism is critical in materials science, affecting physical properties.
    • Glycine exhibits multiple polymorphic forms, including metastable alpha and stable gamma.
    • Understanding crystallization mechanisms is key to controlling polymorphic outcomes.

    Discussion:

    • This study reveals distinct polymorphic outcomes from simultaneous crystallization mechanisms.
    • Bulk solution crystallization of glycine yields the alpha-polymorph.
    • Thin-film evaporation on vessel walls produces the gamma-polymorph with unique crystal morphology.

    Key Insights:

    • Crystallization location (bulk vs. thin film) dictates glycine polymorph.
    • Evaporative crystallization in thin films promotes thermodynamically stable polymorph formation.

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  • The phenomenon highlights the impact of interfacial effects on crystallization.

    • Outlook:

    • Findings suggest broader implications for controlling polymorphism in various systems.
    • Further research can explore interfacial engineering for targeted polymorph synthesis.
    • This work advances the understanding of crystallization process control.