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Updated: Nov 4, 2025
11:20
Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
Published on: August 15, 2018
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Evaluating Superhydrophobic Surfaces under External Pressures using Quartz Crystal Microbalance.
Hamed Esmaeilzadeh, Keqin Zheng, Carol Barry
1Department of Mechanical and Industrial Engineering Northeastern University, Boston, Massachusetts 02115, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 26, 2021
Summary
Hydrophobic surfaces reduce drag, but performance decreases under high hydrostatic pressure. A quartz crystal microbalance (QCM) effectively measures this drag reduction and wetting transitions on superhydrophobic surfaces.
Area of Science:
- Surface science
- Fluid dynamics
- Materials science
Background:
- Hydrophobic surfaces are crucial for applications like drag reduction and microfluidics.
- Understanding their performance under hydrostatic pressure is essential for practical implementation.
Purpose of the Study:
- To evaluate drag reduction and velocity slip of hydrophobic surfaces under hydrostatic pressure.
- To develop and validate a quartz crystal microbalance (QCM) based method for this evaluation.
Main Methods:
- Theoretical development of QCM frequency shift correlation with drag reduction.
- Validation using an epoxy-based superhydrophobic coating and a rheometer.
- QCM analysis of wetting state transitions (Cassie to Wenzel) on micropillar surfaces under pressure.
Main Results:
- A critical hydrostatic pressure was identified for Cassie to Wenzel state transition, indicated by a QCM frequency drop.
- Meniscus height increased with pressure before transition.
- Drag reduction decreased with increasing hydrostatic pressure.
Conclusions:
- QCM is a reliable, low-cost tool for evaluating hydrophobic performance under hydrostatic pressure.
- Hydrostatic pressure significantly impacts drag reduction and wetting states of superhydrophobic surfaces.
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