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Isotropic-nematic spinodal decomposition kinetics.

Jan K G Dhont1, W J Briels

  • 1Forschungszentrum Jülich, Institut für Festkörper Forschung, Weiche Materie, D-52425 Jülich, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 26, 2005
PubMed
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Spinodal demixing in rod suspensions is driven by orientational order, not just density. Rotational diffusion significantly accelerates this process, leading to time-dependent scattering patterns.

Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Physical Chemistry

Background:

  • Understanding phase transitions in colloidal suspensions is crucial.
  • Isotropic-nematic spinodal demixing describes the transition from disordered to ordered phases.
  • Kinetics of these transitions are complex and depend on particle properties.

Purpose of the Study:

  • To analyze the initial stage of spinodal demixing kinetics.
  • To investigate the interplay between density and orientational order.
  • To model the temporal evolution of light-scattering patterns.

Main Methods:

  • Analysis based on the N-particle Smoluchowski equation.
  • Expansion of equations of motion for position and orientation.
  • Analytical solution and calculation of light-scattering patterns.

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Main Results:

  • Number density inhomogeneities are enslaved by orientational order development.
  • Demixing via rotational diffusion is faster than translational diffusion.
  • An unstable rotational mode exists, with a finite eigenvector at zero wave vector.

Conclusions:

  • Orientational order dictates demixing kinetics in these systems.
  • Rotational diffusion is the dominant factor in initial demixing.
  • The peak scattering wave vector evolves with time during demixing.