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Measuring Plant Cell Wall Extension Creep Induced by Acidic pH and by Alpha-Expansin

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Geometry-induced interface pinning at completely wet walls.

Alexandr Malijevský¹

¹Department of Physical Chemistry, University of Chemical Technology Prague, 166 28 Prague 6, Czech Republic and Department of Molecular and Mesoscopic Modelling, ICPF of the Czech Academy Sciences, 165 02 Prague 6, Czech Republic.

Physical Review. E

|May 22, 2019

Summary

Nanopatterned surfaces can alter wetting behavior, changing surfaces from hydrophilic to hydrophobic. This study reveals how nanogroove geometry dictates complete wetting transitions and interface unbinding.

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Fabrication and Visualization of Capillary Bridges in Slit Pore Geometry

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Area of Science:

Physics
Materials Science
Surface Science

Background:

Complete wetting on planar surfaces is well-understood.
Wetting transitions are crucial for material properties and applications.
Macroscopic Wenzel law describes wetting on rough surfaces.

Purpose of the Study:

Investigate complete wetting on surfaces patterned with nanogrooves.
Determine the influence of nanogroove geometry on wetting transitions.
Explore the transition from hydrophilic to hydrophobic wetting.

Main Methods:

Nonlocal density functional theory.
Analysis of fluid-wall interactions via long-range potentials.
Modeling of nanogroove geometry (depth D, width L, periodicity 2L).

Main Results:

Complete wetting behavior is sensitive to microscopic length scales (Lc+, Lc-).
Nanogroove width (L) controls wetting: continuous, first-order depinning, or pinned interface.
Nanomodification can reverse wetting character, contradicting the Wenzel law.

Conclusions:

Substrate nanostructuring offers precise control over wetting properties.
A surface phase diagram analogous to depinning and prewetting transitions is presented.
Nanoscale surface engineering can achieve tunable hydrophilic-to-hydrophobic transitions.