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Single-orientation colloidal crystals from capillary-action-induced shear.

Nicholas H P Orr1, Taiki Yanagishima1, Igor P Dolbnya2

  • 1Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom.

The Journal of Chemical Physics
|December 22, 2022
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Summary
This summary is machine-generated.

Shear-induced crystallization in colloidal dispersions forms large, ordered crystals. This method, using capillary action, creates stable, single-orientation crystals without complex equipment.

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Area of Science:

  • Colloidal science
  • Materials science
  • Soft matter physics

Background:

  • Colloidal dispersions are widely used in materials science.
  • Controlling crystallization in these systems is crucial for material properties.
  • Shear forces can influence particle arrangement and crystal formation.

Purpose of the Study:

  • To investigate colloidal crystallization under capillary-action-induced shear.
  • To understand the role of shear in forming ordered colloidal crystals.
  • To characterize the resulting crystal structures and their stability.

Main Methods:

  • Confocal microscopy to visualize particle arrangements.
  • Small-angle X-ray scattering (SAXS) for structural analysis.
  • Drawing colloidal dispersions into flat-walled capillaries to induce shear.

Main Results:

  • Shear near capillary walls promotes large random hexagonal close-packed (RHCP) crystals with long-range orientational order.
  • Crystallization initiates with hexagonal planes at high-shear regions, followed by epitaxial growth.
  • Shear-induced crystals exhibit larger particle separations along shear/vorticity directions compared to equilibrium RHCP.
  • Competing shear directions at capillary corners create differently oriented hexagonal planes.

Conclusions:

  • Capillary-action-induced shear is an effective method for producing large, single-orientation RHCP colloidal crystals.
  • The process leads to stable crystals without complex shear cell setups.
  • Understanding shear effects allows for controlled fabrication of ordered colloidal materials.