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Alexandr Malijevský1,2, Martin Pospíšil1, Miriam Magočiová2

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This study explores wetting and drying on corrugated walls, revealing how wall shape and interaction forces (short-ranged and long-ranged) influence fluid layer behavior and morphology.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Materials Science

Background:

  • Understanding fluid behavior at interfaces is crucial for various applications.
  • Wetting and drying phenomena are influenced by surface properties and intermolecular forces.
  • Corrugated surfaces introduce geometric complexity to interfacial phenomena.

Purpose of the Study:

  • To investigate complete wetting and drying phenomena at sinusoidally corrugated solid walls.
  • To analyze the impact of wall geometry and interaction range on fluid layer behavior.
  • To differentiate the effects of short-ranged (SR) and long-ranged (LR) interactions.

Main Methods:

  • Analysis of SR forces using nonlocal Hamiltonian theory.
  • Treatment of LR van der Waals interactions using a sharp-kink approximation.
  • Validation of theoretical predictions with classical density functional theory (CDFT) simulations.

Main Results:

  • Derived scaling relations for adsorbed layer width and morphology based on wall geometry.
  • Identified distinct scaling regimes governed by the degree of wall corrugation.
  • Highlighted contrasting influences of SR and LR interactions on wetting and drying dynamics.

Conclusions:

  • Wall geometry and interaction range significantly dictate wetting and drying behavior.
  • SR and LR forces exhibit distinct effects on fluid layer formation and stability.
  • The study provides a theoretical framework corroborated by numerical simulations for interfacial phenomena on complex surfaces.