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Related Concept Videos

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

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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.
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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 Tension01:24

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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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Related Experiment Video

Updated: May 17, 2026

Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
10:52

Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

Published on: March 29, 2018

Tunable water adhesion on titanium oxide surfaces with different surface structures.

Junfei Ou, Weihua Hu, Changquan Li

    ACS Applied Materials & Interfaces
    |October 19, 2012
    PubMed
    Summary
    This summary is machine-generated.

    Researchers tuned water adhesion on titanium oxide surfaces using a two-step process. This method created superhydrophobic surfaces with tunable wetting behaviors, crucial for advanced material applications.

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    Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
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    Published on: November 9, 2015

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    Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
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    Published on: March 29, 2018

    TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method
    07:37

    TiO2-coated Hollow Glass Microspheres with Superhydrophobic and High IR-reflective Properties Synthesized by a Soft-chemistry Method

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    Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment
    08:48

    Selective Area Modification of Silicon Surface Wettability by Pulsed UV Laser Irradiation in Liquid Environment

    Published on: November 9, 2015

    Area of Science:

    • Materials Science
    • Surface Chemistry
    • Nanotechnology

    Background:

    • Developing surfaces with controlled wettability is crucial for various applications, including anti-fouling, self-cleaning, and microfluidics.
    • Titanium oxide (TiO₂) is a versatile material, but achieving tunable superhydrophobicity requires precise surface engineering.

    Discussion:

    • A two-step fabrication process involving etching titanium alloy substrates and subsequent deposition of low-surface-energy molecules (1H, 1H, 2H, 2H-perfluorooctyltrichlorosilane or PFOTS) was employed.
    • Varying immersion times (30, 60, 120 min) in H₂O-H₂O₂-HF solution at 140 °C resulted in distinct TiO₂ surface topographies.
    • The resulting surfaces exhibited high static contact angles (SCA > 150°) and tunable sliding angles (SA), ranging from 180° to as low as 8±1°.

    Key Insights:

    • Surface microstructure significantly influences dynamic wetting behaviors, correlating with Wenzel, Cassie impregnating, and Cassie states.
    • Water/solid interfacial interactions are critical determinants of surface adhesion.
    • The study demonstrates artificial tuning of surface adhesion from high (Wenzel state) to low (Cassie state) by designing appropriate microstructures.

    Outlook:

    • This work provides a pathway for designing surfaces with tailored adhesion properties for specific technological demands.
    • Further research could explore the long-term stability and performance of these tunable superhydrophobic surfaces in diverse environments.
    • Potential applications include advanced coatings, microfluidic devices, and biomedical implants requiring controlled surface interactions.