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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

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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...
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Surface Tension, Capillary Action, and Viscosity02:57

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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...
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Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Cohesion01:07

Cohesion

58.0K
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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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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Droplet leaping governs microstructured surface wetting.

Susumu Yada1, Shervin Bagheri1, Jonas Hansson2

  • 1Department of Mechanics, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden. shervin@mech.kth.se.

Soft Matter
|November 14, 2019
PubMed
Summary
This summary is machine-generated.

Researchers discovered three wetting regimes—spread, stick, and contact line leaping—on microstructured surfaces. This finding enhances understanding of liquid transport dynamics on engineered surfaces for applications like water harvesting.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Microstructured surfaces are vital for controlling liquid transport in nature and technology.
  • Existing knowledge lacks a fundamental understanding of initial wetting dynamics on these surfaces.

Purpose of the Study:

  • To investigate and define the initial wetting dynamics of liquids on microstructured surfaces.
  • To identify the governing regimes of wetting on short time scales.

Main Methods:

  • Experimental investigations of liquid spreading on microstructured surfaces.
  • Numerical simulations to model wetting dynamics.
  • Analysis of wetting regimes based on flow direction and surface geometry.

Main Results:

  • Identified three distinct wetting regimes: spread, stick, and contact line leaping.
  • Contact line leaping involves the formation of a new contact line downstream.
  • Regime emergence is dependent on flow direction on asymmetric microstructured surfaces.

Conclusions:

  • The study provides a fundamental understanding of microstructured surface wetting dynamics.
  • Insights are applicable to droplet impact, splashing, and vibrating surface wetting.
  • Findings can aid in designing advanced structured surfaces for applications like water harvesting and separation.