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Propagating Precipitation Waves in Disordered Media.

Takahiko Ban1, Masaru Kaji2,3, Yuichiro Nagatsu4

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Precipitation waves in gels transform from rings to turbulence, influenced by gel microstructure disorder. Controlling wave patterns is possible by adjusting gel permeability fluctuations, enhancing understanding of pattern formation.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Soft Matter Physics

Background:

  • Precipitation reactions in gels can form complex patterns.
  • Gel microstructure heterogeneity influences reaction-diffusion dynamics.
  • Understanding pattern formation in disordered systems is crucial.

Purpose of the Study:

  • Investigate the form changes of precipitation waves in inhomogeneous gel matrices.
  • Analyze the anomalous diffusion dynamics of these waves.
  • Determine methods for controlling precipitation pattern formation.

Main Methods:

  • Experimental observation of wave propagation in gels with varying microstructures.
  • Analysis of wave morphology transitions (ring to target to spiral to turbulence).
  • Characterization of anomalous diffusion and effective diffusion coefficients.

Main Results:

  • Observed wave patterns evolve from simple rings to complex targets, spirals, and turbulence.
  • Anomalous diffusion was identified in the precipitation wave dynamics.
  • Effective diffusion coefficients showed a linear increase with quenching temperature.
  • Precipitation pattern formation is controllable via gel permeability fluctuations.

Conclusions:

  • Gel microstructure disorder drives spontaneous precipitation pattern formation.
  • Anomalous diffusion plays a key role in pattern evolution.
  • Control over precipitation patterns can be achieved by tuning gel properties, offering insights into disordered systems.