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Related Concept Videos

Adhesion01:14

Adhesion

39.8K
Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
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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

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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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Adhesion Reduction at Solid/Liquid Interfaces Based on Topologically Optimized Microtextures.

Zhen Li1,2, Yeming Han1, Jianyu Zhang1

  • 1State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences, Changchun 130033, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 23, 2024
PubMed
Summary
This summary is machine-generated.

Artificial microtextures designed with topology optimization significantly reduce liquid adhesion by 45%. These robust microtextures maintain the Cassie-Baxter state, improving droplet sliding and reducing drag and bioadhesion.

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Area of Science:

  • Surface Science and Engineering
  • Materials Science
  • Microfluidics

Background:

  • Chemical coatings for adhesion reduction have vulnerabilities.
  • Current microtextures often lack manufacturability due to complex designs.
  • Topology optimization offers a method to design manufacturable microstructures.

Purpose of the Study:

  • To reduce liquid adhesion on solid surfaces using artificial microtextures.
  • To design microtextures via topology optimization for enhanced performance.
  • To investigate the wetting behavior and adhesion reduction capabilities of these microtextures.

Main Methods:

  • Inverse design of hexagonal periodic microtextures using topology optimization.
  • Fabrication of polydimethylsiloxane (PDMS) microtextures via soft lithography.
  • Measurement of liquid adhesion using the tilting plate method.

Main Results:

  • Topologically optimized microtextures reduced liquid adhesion by 45.0%.
  • Achieved significant adhesion reduction through a robust Cassie-Baxter wetting state.
  • Demonstrated robust Cassie-Baxter state underwater and accelerated droplet sliding.

Conclusions:

  • Topology optimization is effective for designing manufacturable microtextures for adhesion reduction.
  • The designed microtextures offer significant performance benefits in reducing liquid adhesion.
  • Potential applications include reducing underwater drag and bioadhesion.