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Syed Shuja Hasan Zaidi1, Prabhat K Jaiswal1, Madhu Priya2

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Summary
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This study reveals universal fast-mode kinetics in surface-directed spinodal decomposition (SDSD) for binary mixtures. Molecular dynamics simulations show distinct early-stage wetting layer growth laws for different surface potentials.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Surface Science

Background:

  • Surface-directed spinodal decomposition (SDSD) is crucial for understanding phase separation in mixtures near surfaces.
  • Wetting phenomena significantly influence early-stage decomposition kinetics.
  • Previous studies have debated the universality of these kinetics.

Purpose of the Study:

  • To investigate early-stage wetting kinetics in binary mixtures undergoing SDSD.
  • To explore the impact of long-ranged and short-ranged surface potentials on SDSD.
  • To establish the existence and universality of fast-mode kinetics.

Main Methods:

  • Comprehensive molecular dynamics (MD) simulations of unstable symmetric binary mixtures.
  • Modeling of both long-ranged (power-law) and short-ranged surface potentials.
  • Analysis of wetting-layer thickness growth (R1(t)) over time.

Main Results:

  • For long-ranged potentials, wetting-layer growth follows R1(t) ~ t^(1/(n+2)) then transitions to a universal R1(t) ~ t^(3/2) fast-mode regime.
  • Short-ranged potentials exhibit logarithmic initial growth but also show rapid kinetics.
  • Phenomenological arguments support the observed growth laws.

Conclusions:

  • MD simulations confirm universal fast-mode kinetics in SDSD.
  • The study resolves controversies regarding the universality of early-stage wetting kinetics.
  • Understanding these kinetics is vital for controlling material properties.