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Minimal model for phase separation under slow cooling.

Jürgen Vollmer1, Günter K Auernhammer, Doris Vollmer

  • 1Physics Department, Philipps Universität, Renthof 6, 35032 Marburg, Germany.

Physical Review Letters
|May 16, 2007
PubMed
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Repeated nucleation waves during phase separation, observed when cooling ethanol and oil, are thermodynamically driven. Their frequency depends on diffusion and cooling rate, not sample specifics, as shown by a minimal theoretical model and experiments.

Area of Science:

  • Thermodynamics
  • Physical Chemistry
  • Materials Science

Background:

  • Phase separation is a common phenomenon in mixtures.
  • Temperature changes can induce dynamic processes like nucleation waves.
  • Previous studies have observed these oscillations but lacked a clear theoretical framework.

Purpose of the Study:

  • To propose a minimal theoretical model for thermodynamically driven nucleation waves.
  • To explain the factors influencing the frequency of these oscillations.
  • To validate the theoretical model with experimental data.

Main Methods:

  • Observing nucleation waves in ethanol and vegetable oil mixtures during controlled cooling.
  • Developing a minimal theoretical model based on thermodynamic principles.

Related Experiment Videos

  • Comparing model predictions with experimental frequency measurements.

    • Main Results:

    • Nucleation waves were successfully induced and observed during slow cooling.
    • The minimal theoretical model accurately predicts the oscillatory behavior.
    • Oscillation frequency was found to depend on diffusion constant and cooling ramp rate.
    • Frequency was independent of overall composition and sample geometry.

    Conclusions:

    • The observed nucleation waves are of thermodynamic origin.
    • The minimal theoretical model provides a robust explanation for the phenomenon.
    • The findings offer insights into controlling phase separation dynamics.