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Probing Liquid Drop Induced Deformation on Soft Solids Using Dual-Wavelength Reflection Interference Contrast

Surjyasish Mitra¹, Sirshendu Misra², Tuan Tran³

¹Division of Physics & Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 14, 2022

Summary

A liquid drop creates a "wetting ridge" on soft solids, with its size depending on material properties. This study quanties how elasticity and thickness affect this deformation, finding a universal length scale.

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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

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Published on: March 5, 2014

Area of Science:

Soft matter physics
Surface science
Materials science

Background:

Liquid drops on soft solids cause surface deformation at the contact line, forming a wetting ridge.
The wetting ridge's dimensions (nanoscale to microscale) are influenced by the soft material's elasticity and thickness.

Purpose of the Study:

To investigate the impact of surface elasticity and coating thickness on the normal and tangential deformation profiles of soft solids under a sessile liquid drop.
To experimentally determine a characteristic length scale that accurately describes wetting ridge profiles across varying soft layer properties.

Main Methods:

Utilizing dual-wavelength reflection interference contrast microscopy to precisely measure surface deformation.
Systematically varying the elasticity and thickness of soft solid substrates.

Main Results:

Detailed mapping of normal and tangential surface deformation profiles induced by liquid drops.
Identification of a characteristic length scale that consistently describes wetting ridge geometry for different elasticities and thicknesses.

Conclusions:

Surface elasticity and coating thickness are critical factors governing wetting ridge formation.
A single characteristic length scale effectively parameterizes wetting ridge profiles, offering a unified understanding across diverse soft material systems.