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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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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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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Surface Chemistry

Background:

  • Slippery liquid-infused porous surfaces (SLIPS), inspired by the Nepenthes pitcher plant, offer excellent liquid repellency and self-healing properties.
  • While stable underwater bubble transport on SLIPS is possible, precise and sophisticated bubble manipulation remains a significant challenge.
  • Existing SLIPS technologies require further development for advanced control over bubble dynamics.

Purpose of the Study:

  • To design and fabricate a novel three-dimensional topological SLIPS with a rice leaf-like groove array for precise underwater bubble motion guidance.
  • To investigate the dynamic behavior and wetting states of bubbles on engineered SLIPS.
  • To explore sophisticated bubble manipulations, including directional transport and collection, using topologically varied SLIPS.

Main Methods:

  • Fabrication of a 3D topological SLIPS incorporating a submillimeter rice leaf-like groove array.
  • Experimental investigation of bubble dynamics and wetting states on the fabricated SLIPS.
  • Design and creation of topological SLIPS with varying geometric textures to achieve advanced bubble control.

Main Results:

  • The developed topological SLIPS effectively guided underwater bubble motion with high precision.
  • Different geometric textures on SLIPS enabled sophisticated bubble manipulations like fast directional transport and collection.
  • Lubricants with low surface tension and viscosity enhanced bubble adhesion and transport velocity.

Conclusions:

  • The study deepens the understanding of bubble-SLIPS interactions, particularly in underwater environments.
  • The engineered topological SLIPS demonstrate significant potential for smart bubble manipulation applications.
  • Findings pave the way for advancements in fields such as catalytic chemistry and microfluidics.