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Capillarity in Fluid

Capillarity in Fluid

Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...

Surface Tension, Capillary Action, and Viscosity

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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...

Surface Tension of Fluid

Surface 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...

Rise of Liquid in a Capillary Tube

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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.

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Related Experiment Video

Updated: May 28, 2025

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

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

Published on: June 14, 2019

Fast capillary waves on an underwater superhydrophobic surface.

Maxime Fauconnier¹, Bhuvaneshwari Karunakaran², Alex Drago-González³

¹Medical Ultrasonics Laboratory (MEDUSA), Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland. maxime.fauconnier@aalto.fi.

Nature Communications

|February 12, 2025

Summary

This summary is machine-generated.

Researchers have discovered "plastronic waves" on superhydrophobic surfaces, which travel up to 45 times faster than typical water waves. These waves can monitor the stability of underwater gas layers, aiding in non-destructive analysis.

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Last Updated: May 28, 2025

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

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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

Published on: August 27, 2013

Area of Science:

Fluid dynamics
Surface science
Acoustics

Background:

Interfacial wave propagation is well-studied in open water conditions.
Superhydrophobic surfaces can stabilize microscale gas layers (plastrons) underwater.
Previous research has not explored waves on these plastron interfaces.

Purpose of the Study:

To investigate the generation and properties of waves on a plastron interface.
To explore the potential applications of these novel waves.

Main Methods:

Utilizing focused MHz ultrasound to generate acoustic radiation force.
Inducing kHz
plastronic waves
on the gas-water interface of a plastron.
Analyzing wave propagation speed and its dependence on microstructure geometry and gas saturation.

Main Results:

Successfully triggered kHz plastronic waves using MHz ultrasound.
Observed significantly high wave propagation speeds (up to 45x faster than conventional capillary waves).
Demonstrated a correlation between wave speed and microstructure geometry, and temporal variations linked to gas saturation.

Conclusions:

Plastronic waves exhibit unique high-speed propagation characteristics.
These waves are influenced by surface microstructure and gas layer stability.
Plastronic waves offer a promising method for non-destructive monitoring of plastron stability and air diffusion in underwater superhydrophobic surfaces.