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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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Hydrostatic Pressure Force on a Curved Surface01:04

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Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
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When a plane surface is submerged in a fluid, hydrostatic forces develop on the surface due to the fluid's pressure. For horizontal surfaces, the pressure exerted by the fluid is uniform because the depth remains constant. The resultant force is determined by the pressure at the given depth multiplied by the area of the surface, and it acts through the centroid of the surface. For vertical surfaces, the pressure varies with depth, increasing as the distance from the fluid's free surface...
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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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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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Updated: Jun 12, 2025

Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Universal droplet propulsion by dynamic surface-charge wetting.

Yifan Zhou1, Jiayao Wu2, Ge Gao1

  • 1School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China.

Microsystems & Nanoengineering
|September 26, 2024
PubMed
Summary
This summary is machine-generated.

A new method uses dynamic surface-charge wetting to propel droplets on surfaces. This technique offers high speed and adaptability for various applications, overcoming limitations of existing droplet propulsion technologies.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Controllable droplet propulsion is vital for many technologies.
  • Existing methods face limitations in additive use, surface versatility, and transport speed.

Purpose of the Study:

  • To demonstrate a universal droplet propulsion method using dynamic surface-charge wetting.
  • To overcome limitations of current droplet manipulation techniques.

Main Methods:

  • Depositing oscillating, opposite surface charges on unmodified dielectric films.
  • Utilizing dynamic surface-charge wetting to create an imbalance in contact angles.
  • Generating electrostatic forces via charge storage and spreading.

Main Results:

  • Achieved high-speed droplet propulsion (~130 mm/s).
  • Demonstrated adaptability to a wide range of droplet volumes (1 μL-1 mL).
  • Showcased strong handling on surfaces with high contact angle hysteresis (up to 35°).
  • Exhibited programmability, reconfigurability, and low mass loss.

Conclusions:

  • Dynamic surface-charge wetting provides a versatile and efficient droplet propulsion method.
  • The technique has significant potential in microreactions, defogging, and surface cleaning.
  • This approach overcomes key limitations of existing droplet manipulation technologies.