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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

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Published on: June 14, 2019

Dynamic adhesion forces between microparticles and substrates in water.

Quan Xu¹, Mingtao Li, Lipeng Zhang

¹Institute of New Energy, China University of Petroleum (Beijing) , Beijing 102249, P. R. China.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 28, 2014

Summary

Dynamic adhesion forces between microparticles and surfaces increase significantly in liquids like water, air, and hexane. This enhancement is linked to surface properties and fluid dynamics, with a dynamic model accurately predicting these adhesion forces.

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Published on: June 14, 2019

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Area of Science:

Surface science
Colloid and interface science
Physical chemistry

Background:

Particle-substrate interactions are crucial in natural and industrial processes.
Understanding adhesion forces in aqueous environments is essential.

Purpose of the Study:

To investigate dynamically induced adhesion enhancement between microparticles and substrates.
To quantify the effect of retracting velocity on adhesion forces in different media.
To develop a model predicting dynamic adhesion.

Main Methods:

Measuring adhesion forces by pulling microspheres from substrates at varying velocities (0.02 to 1500 μm/s).
Testing hydrophilic and hydrophobic surfaces in water, air, nitrogen, and hexane.
Developing and validating a dynamic adhesion model.

Main Results:

Adhesion force increased by 100-200% in water and 100% in nitrogen and hexane with increasing velocity.
Dynamic adhesion enhancement decreased with increasing effective contact angle (>90°).
Model predictions showed good correlation with experimental results.

Conclusions:

Dynamic effects significantly enhance microparticle-substrate adhesion in various fluids.
Water's electrical double layers and molecular restructuring contribute to stronger dynamic adhesion.
The developed model accurately predicts dynamic adhesion forces.