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Related Concept Videos

Contact Angle01:13

Contact Angle

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 force...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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...
Adhesion01:14

Adhesion

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 glass...
Surface Tension of Fluid01:22

Surface Tension of Fluid

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 with...
Surface Tension01:24

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...

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Light-induced Patterning and Grafting for Slippery Surfaces based on Silane-coated Nanoporous Structures
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Bioinspired super-antiwetting interfaces with special liquid-solid adhesion.

Mingjie Liu1, Yongmei Zheng, Jin Zhai

  • 1National Centre for NanoScience and Technology, Beijing 100190, P. R. China.

Accounts of Chemical Research
|December 4, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed bioinspired super-antiwetting surfaces with tunable liquid-solid adhesion. These surfaces mimic natural structures like lotus leaves and gecko feet for applications in low-adhesion and high-adhesion scenarios, offering novel antibioadhesion materials.

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Area of Science:

  • Materials Science
  • Surface Science
  • Biomimetics

Background:

  • Super-antiwetting interfaces, including superhydrophobic and superamphiphobic surfaces, exhibit unique liquid-solid adhesion properties.
  • Controlling liquid-solid adhesion is achievable by engineering surface microstructures and compositions to influence contact modes.

Purpose of the Study:

  • To review recent advancements in designing and fabricating bioinspired super-antiwetting interfaces with tunable liquid-solid adhesion.
  • To explore biomimetic approaches for creating both low-adhesion and high-adhesion superhydrophobic surfaces.
  • To demonstrate dynamic control over liquid-solid adhesion on superhydrophobic surfaces and explore underwater antiadhesion applications.

Main Methods:

  • Bioinspired design of surface microstructures mimicking natural examples like lotus leaves, gecko feet, and rose petals.
  • Fabrication of surfaces with nanoscale pores and hierarchical structures to trap air and induce adhesive forces.
  • Utilizing stimuli-responsive materials and surface geometry for reversible control of adhesion states (rolling vs. pinning).
  • Investigating superoleophobic interfaces in water to reduce adhesion of oil droplets and platelets.

Main Results:

  • Demonstrated low-adhesion superhydrophobic surfaces inspired by lotus leaves utilizing a composite contact mode.
  • Developed high-adhesion superhydrophobic surfaces mimicking gecko feet (trapped air for negative pressure adhesion) and rose petals (Wenzel state control).
  • Achieved tunable, directional adhesion and reversible transitions between low-adhesive and high-adhesive states using external stimuli (temperature, fields).
  • Created bioinspired superoleophobic interfaces in water that reduce adhesion to oil droplets and platelets by trapping water.

Conclusions:

  • Bioinspired design offers effective strategies for creating super-antiwetting interfaces with precisely controlled liquid-solid adhesion.
  • Tunable adhesion properties open possibilities for advanced applications, including antibioadhesion materials.
  • Understanding and mimicking natural systems provides a powerful framework for developing novel functional surfaces.