Related Experiment Video
Updated: May 30, 2026
11:20
Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
Published on: August 15, 2018
Electrowetting-induced dewetting transitions on superhydrophobic surfaces
Niru Kumari1, Suresh V Garimella
1School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 21, 2011
Summary
We use electrowetting to transition superhydrophobic surfaces from the Wenzel to Cassie state, overcoming dissipative forces. This voltage-controlled method enables complete dewetting of liquid droplets from these surfaces.
Area of Science:
- Surface science
- Physics
Background:
- Superhydrophobic surfaces exhibit unique wetting properties.
- The Wenzel and Cassie states describe different liquid-solid interactions on rough surfaces.
Purpose of the Study:
- To demonstrate electrowetting for controlled dewetting of superhydrophobic surfaces.
- To investigate the transition from the Wenzel to Cassie state.
- To quantify dissipative forces hindering dewetting.
Main Methods:
- Utilizing electrowetting with an opposing flat plate and a three-electrode system.
- Applying voltage to induce droplet dewetting.
- Experimentally measuring dissipative forces.
Main Results:
- Achieved complete dewetting of superhydrophobic surfaces via electrowetting.
- Successfully transitioned surfaces from the Wenzel to Cassie state.
- Quantified dissipative forces, finding their energy comparable to interfacial energies.
Conclusions:
- Electrowetting provides a viable method for controlling superhydrophobic surface wetting states.
- Dissipative forces play a significant role in preventing spontaneous dewetting.
- Understanding these forces is crucial for designing advanced hydrophobic materials.
More Related Videos
Related Concept Videos
02:57Surface Tension, Capillary Action, and Viscosity
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
01:22Surface Tension of Fluid
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface tension varies with...
01:24Surface Tension
Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...