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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

1.9K
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

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...
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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.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Related Experiment Video

Updated: Mar 17, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Tunable superomniphobic surfaces for sorting droplets by surface tension.

S Movafaghi1, W Wang1, A Metzger1

  • 1Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523, USA. arun.kota@colostate.edu.

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|July 15, 2016
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Summary
This summary is machine-generated.

Researchers developed a novel device using tunable superomniphobic surfaces to sort liquid droplets based on surface tension. This innovation paves the way for efficient, low-cost analytical tools in diagnostics and biosensing.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Droplet manipulation is crucial for microfluidic devices and diagnostics.
  • Existing methods for droplet sorting often lack precision or are energy-intensive.

Purpose of the Study:

  • To develop a novel method for sorting droplets based on their surface tension.
  • To create a simple, energy-efficient device for droplet manipulation.

Main Methods:

  • Fabrication of tunable superomniphobic surfaces with flower-like titanium dioxide (TiO2) nanostructures.
  • Creation of precisely tailored surface energy domains on the device.
  • Utilizing these domains to sort droplets by surface tension.

Main Results:

  • Demonstrated the first device capable of sorting droplets by surface tension.
  • Successfully tailored surface energy domains for precise droplet control.
  • Achieved droplet sorting using a simple, low-energy approach.

Conclusions:

  • The developed methodology enables precise droplet sorting based on surface tension.
  • This approach offers potential for inexpensive and energy-efficient analytical devices.
  • The technology is applicable to personalized diagnostics, lab-on-a-chip systems, biochemical assays, and biosensors.