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Related Concept Videos

Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

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.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
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,...
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 Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
Oriented Surfaces01:30

Oriented Surfaces

A surface is called orientable if a consistent choice of unit normal vector can be made at every point on the surface. A thin soap film stretched across a wire loop provides a familiar example. The film separates the air on one side from the air on the other, so one side can be selected as positive and the opposite side as negative. Once this choice is made, a unit normal vector can be assigned smoothly across the entire surface.At each point on the soap film, a unit normal vector points...
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...

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The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
10:27

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

Published on: October 11, 2016

Oxide surface science.

Ulrike Diebold1, Shao-Chun Li, Michael Schmid

  • 1Department of Physics, Tulane University, New Orleans, Louisiana 70118, USA. diebold@tulane.edu

Annual Review of Physical Chemistry
|January 9, 2010
PubMed
Summary
This summary is machine-generated.

This study explores metal oxide surfaces, crucial for catalysis and materials science. Researchers use advanced microscopy and theory to understand surface properties, defects, and stability for applications like CO oxidation.

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Area of Science:

  • Materials Science
  • Surface Science
  • Computational Chemistry

Background:

  • Metal oxides exhibit technologically promising properties, driving research into their surfaces.
  • Understanding oxide surfaces is key for developing new materials and catalysts.

Purpose of the Study:

  • To review atomic-scale properties of metal-oxide materials.
  • To highlight the role of surface polarity, defects, and ultrathin films in oxide behavior.

Main Methods:

  • Combination of scanning tunneling microscopy (STM) and first-principles density functional theory (DFT).
  • Analysis of ZnO for surface polarity and TiO(2) for defect interplay.
  • Investigation of ultrathin metal-oxide films and Pt-group metal oxides.

Main Results:

  • Surface polarity is critical for predicting oxide surface stability (e.g., ZnO).
  • Surface defects significantly influence reactivity and interact with bulk defects (e.g., TiO(2)).
  • Ultrathin oxide films serve as model catalyst supports, and Pt-group surface oxides model CO oxidation.

Conclusions:

  • Atomic-scale understanding of metal-oxide surfaces is achievable through combined experimental and computational methods.
  • Surface properties like polarity and defects are crucial for controlling material behavior and catalytic activity.
  • Model systems provide insights into complex surface phenomena relevant to catalysis.