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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Morphological transitions of droplets wetting rectangular domains.

Davide Ferraro1, Ciro Semprebon, Tamara Tóth

  • 1CNISM and Dipartimento di Fisica G. Galilei, Università di Padova, Padova, Italy.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 6, 2012
PubMed
Summary

Researchers studied water shapes on hydrophilic posts, observing continuous and discontinuous changes in liquid filaments with volume. Bistability occurred above a threshold length, revealing complex interfacial behaviors.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Understanding fluid behavior in confined geometries is crucial for microfluidics and material design.
  • Interfacial phenomena dictate wetting and dewetting processes on surfaces.

Purpose of the Study:

  • To investigate the interfacial morphologies of water confined to hydrophilic rectangular posts.
  • To analyze the transition between different liquid filament shapes as a function of liquid volume and post length.

Main Methods:

  • Comprehensive experimental investigations.
  • Numerical calculations.
  • Systematic variation of post dimensions (width W, length L) and liquid volume.

Main Results:

  • Observed continuous evolution of interfacial shapes from homogeneous to bulged liquid filaments with changing liquid volume.
  • Identified a threshold length (L* = 16.0W) where the transition becomes discontinuous.
  • Demonstrated bistability of interfacial shapes within a specific reduced liquid volume range above L*.

Conclusions:

  • The study reveals complex, length-dependent interfacial dynamics of confined water.
  • Discontinuous transitions and bistability highlight the non-linear nature of capillary forces in microscale geometries.
  • Findings are relevant for designing microfluidic devices and understanding wetting phenomena on structured surfaces.