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Kinetics of cross-nucleation between polymorphs.

Jing Tao, Lian Yu

    The Journal of Physical Chemistry. B
    |April 8, 2006
    PubMed
    Summary
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    This study measures cross-nucleation between d-mannitol polymorphs, finding that the alpha form nucleates on the delta form. Additives like poly(vinylpyrrolidone) can accelerate this crystallization phenomenon.

    Area of Science:

    • Crystallization Science
    • Materials Science
    • Physical Chemistry

    Background:

    • Polymorphism is crucial in materials science, affecting physical properties.
    • Cross-nucleation, where one polymorph forms on another, is a newly observed crystallization phenomenon.
    • Understanding polymorph interactions is key to controlling crystallization processes.

    Discussion:

    • This research presents the first kinetic measurements of cross-nucleation between d-mannitol polymorphs (delta and alpha).
    • Alpha-d-mannitol was observed to nucleate on existing delta-d-mannitol spherulites.
    • The kinetics were quantified using nucleus frequency, inter-nucleus distances, and spherulite growth rates.

    Key Insights:

    • The study quantifies the kinetics of alpha-d-mannitol nucleating on delta-d-mannitol.

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  • Poly(vinylpyrrolidone) was found to increase the rate of this cross-nucleation process.
  • This work provides foundational data for the theory and control of crystallization.

    • Outlook:

    • Further research can explore cross-nucleation in other polymorphic systems.
    • Investigating the influence of different additives on cross-nucleation kinetics is warranted.
    • This understanding can lead to improved control over material properties through tailored crystallization.