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Three-Phase Fluid Coexistence in Heterogenous Slits.

Martin Láska1, Andrew O Parry2, Alexandr Malijevský1

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Fluid condensation in chemically patterned capillary slits was studied. Researchers found conditions for local bridging to precede global condensation, revealing triple points where multiple fluid states coexist.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Nanotechnology

Background:

  • Capillary condensation describes fluid accumulation in confined spaces.
  • Chemical heterogeneity on surfaces significantly impacts fluid behavior.
  • Understanding phase transitions in nanopores is crucial for material science and nanotechnology.

Purpose of the Study:

  • To investigate the competition between local bridging and global condensation in chemically heterogeneous capillary slits.
  • To determine the conditions favoring local condensation over global capillary condensation.
  • To identify the existence and conditions for triple points in such systems.

Main Methods:

  • Utilized a mesoscopic modified Kelvin equation to model meniscus shapes.
  • Analyzed fluid behavior based on stripe and outer wall contact angles.
  • Employed classical density functional theory for microscopic validation.

Main Results:

  • Established conditions where local bridging precedes global condensation with increasing pressure.
  • Demonstrated the possibility of triple points (evaporated, locally condensed, globally condensed states) based on aspect ratio (L/H).
  • Found that for dry walls with wet stripes, the triple point occurs at the maximum aspect ratio of 8/π.

Conclusions:

  • The study accurately predicts fluid condensation phenomena in heterogeneous slits using mesoscopic models.
  • Microscopic simulations confirm the accuracy of the modified Kelvin equation even for narrow slits.
  • Highlights distinct condensation behaviors in slits compared to heterogeneous cylindrical pores.