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Related Concept Videos

Surface Tension of Fluid01:22

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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.
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Surface Tension and Surface Energy01:16

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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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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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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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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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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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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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The Dynamic Surface Tension of Water.

Ines M Hauner1,2, Antoine Deblais3, James K Beattie4

  • 1van der Waals-Zeeman Institute, University of Amsterdam , 1098XH Amsterdam, The Netherlands.

The Journal of Physical Chemistry Letters
|March 17, 2017
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The surface tension of freshly formed water surfaces is higher than equilibrium levels, revealing a dynamic process on a millisecond timescale. This finding challenges conventional understanding of water

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Fluid Dynamics

Background:

  • Water's surface tension is crucial for biological and industrial applications, typically attributed to hydrogen bonding and dipolar interactions.
  • Equilibrium surface tension of water is approximately 72 mN m⁻¹, significantly higher than nonpolar liquids.

Purpose of the Study:

  • To investigate the dynamic surface tension of freshly created water surfaces.
  • To understand the relaxation process and underlying mechanisms of dynamic surface tension in water.

Main Methods:

  • Studying the formation dynamics of water drops.
  • Measuring surface tension during the initial milliseconds of surface creation.
  • Experimentally probing the influence of pH on dynamic surface tension.

Main Results:

  • A freshly created water surface exhibits a higher surface tension (∼90 mN m⁻¹) compared to equilibrium conditions (∼72 mN m⁻¹).
  • A relaxation process with a time scale of approximately 1 ms was observed.
  • Dynamic surface tension was largely unaffected by changes in pH.

Conclusions:

  • Water's surface tension is not static and exhibits dynamic behavior on short timescales.
  • The observed dynamic surface tension and its relaxation are not primarily driven by pH-dependent adsorption or conventional hydrogen bonding/dipole orientation effects.
  • Further research is needed to elucidate the precise mechanisms governing dynamic surface tension in water.