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Stacking fault structure in shear-induced colloidal crystallization.

Tesfu Solomon1, Michael J Solomon

  • 1Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.

The Journal of Chemical Physics
|April 15, 2006
PubMed
Summary
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Shear fields create ordered colloidal crystals, but higher strain amplitudes introduce stacking faults. These faults lead to spatial heterogeneity, disrupting crystal order at larger scales.

Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Colloidal Systems

Background:

  • Colloidal crystals are model systems for studying phase transitions and ordering phenomena.
  • Shear fields are known to induce order in amorphous colloidal suspensions.
  • Stacking faults are common defects in crystalline structures, affecting material properties.

Purpose of the Study:

  • To investigate the spatial distribution and three-dimensional structure of stacking faults in sheared colloidal crystals.
  • To correlate stacking fault formation with applied strain amplitude and particle interactions.
  • To understand the impact of shear on the ordering and defect dynamics in colloidal systems.

Main Methods:

  • Formation of colloidal crystals using oscillatory shear fields at 52% particle volume fraction.

Related Experiment Videos

  • Direct visualization of stacking faults using confocal laser scanning microscopy.
  • Quantitative analysis of spatial heterogeneity and stacking parameters.

    • Main Results:

    • Shear ordering transforms amorphous colloids into close-packed planes, with crystal orientation dependent on strain amplitude.
    • Increased strain amplitude leads to a decrease in layer ordering quality and the formation of stacking faults.
    • Spatial heterogeneity in stacking faults is observed in both flow-vorticity and gradient directions, especially at high strain amplitudes (gamma >= 3).

    Conclusions:

    • Stacking faults introduce significant spatial heterogeneity in sheared colloidal crystals, limiting ordered domains to approximately 5-10 particle diameters.
    • The observed heterogeneity aligns with previous scattering studies indicating random layer ordering.
    • Crystals exhibit complex stacking sequences, including non-random alternating patterns, in the gradient direction.