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Nanoscopic liquid bridges between chemically patterned atomistic walls.

C J Hemming1, G N Patey

  • 1Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.

The Journal of Physical Chemistry. B
|February 24, 2006
PubMed
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Chemically patterned walls induce liquid bridges between Lennard-Jones molecules A and B near phase separation. Forces on walls strongly depend on wall lattice registry, showing oscillatory behavior when A-rich bridges form.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Physics

Background:

  • Understanding liquid behavior near phase separation is crucial for materials design.
  • Confined liquids exhibit unique properties influenced by surface interactions.
  • Chemically patterned surfaces can direct molecular assembly and phase behavior.

Purpose of the Study:

  • To investigate the formation and properties of liquid bridges in binary mixtures confined by patterned walls.
  • To measure normal and lateral forces on patterned walls as a function of confinement and registry.
  • To explore the influence of wall-molecule interactions on liquid phase behavior near separation.

Main Methods:

  • Grand canonical Monte Carlo (GCMC) simulations were employed to study a binary liquid mixture (Lennard-Jones molecules A and B).

Related Experiment Videos

  • Simulations focused on systems near the critical point of phase separation.
  • Atomistic, chemically patterned walls with patches attractive to molecule A were used to confine the liquid.

    • Main Results:

    • A-rich liquid bridges were observed to condense between attractive patches on closely spaced walls.
    • Normal and lateral forces on the walls were measured, showing dependence on wall separation and lateral patch displacement.
    • Strong, oscillatory force variations were detected when the liquid bridge consisted of one or two molecular layers and the wall lattice constant matched crystalline A, indicating registry dependence.

    Conclusions:

    • Chemically patterned walls can induce the formation of specific liquid phases (A-rich bridges) in binary mixtures near phase separation.
    • The forces exerted on the walls are highly sensitive to the precise arrangement (registry) of the patterned surfaces.
    • This study highlights the potential for controlling confined liquid behavior through surface chemistry and nanostructure design.