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Related Experiment Videos

Crystallization on confined engineered surfaces: a method to control crystal size and generate different polymorphs.

Alfred Y Lee1, In Sung Lee, Severine S Dette

  • 1Department of Chemical and Environmental Engineering, Illinois Institute of Technology, Chicago, Illinois 60616, USA.

Journal of the American Chemical Society
|October 27, 2005
PubMed
Summary

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Researchers patterned glycine crystals on metallic islands, controlling crystal size and form. Smaller islands yielded metastable beta-glycine, while larger islands favored alpha-glycine, demonstrating a method for solid form screening.

Area of Science:

  • Materials Science
  • Crystallography
  • Nanotechnology

Background:

  • Controlling crystal polymorphism is crucial for pharmaceutical and materials applications.
  • Nucleation and growth of organic crystals on patterned substrates offer precise control over crystal morphology and size.

Purpose of the Study:

  • To investigate the influence of metallic island dimensions on glycine crystal nucleation and polymorphism.
  • To demonstrate a method for fabricating micron-sized glycine particles with controlled solid forms.

Main Methods:

  • Fabrication of patterned metallic square islands on a substrate.
  • Nucleation and crystallization of glycine on these functionalized islands.
  • Characterization of glycine crystal size and polymorphic form (alpha- and beta-glycine) using microscopy and diffraction techniques.

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Main Results:

  • Glycine crystals were successfully nucleated and grown on patterned metallic islands.
  • The size of the glycine crystals was directly controlled by the dimensions of the underlying metallic islands.
  • High-energy metastable beta-glycine was observed to crystallize on small islands.
  • The alpha-polymorph of glycine became the dominant form on larger islands.

Conclusions:

  • Metallic island dimensions serve as a critical parameter for controlling glycine crystal size and polymorphic outcome.
  • This patterned nucleation approach provides a versatile platform for fabricating micron-scale crystalline particles.
  • The method enables effective screening of solid forms under various conditions, relevant for pharmaceutical development and materials science.