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Related Concept Videos

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...
Adherens Junctions01:24

Adherens Junctions

Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
The endothelial cells...
Desmosomes01:05

Desmosomes

The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are  essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein complexes comprising desmosomal...
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
Bonding in Metals02:32

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...

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Related Experiment Video

Updated: Jun 24, 2026

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
10:32

Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

Published on: January 9, 2014

Bonding and adhesion at the SiC/Fe interface.

Donald F Johnson1, Emily A Carter

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

The Journal of Physical Chemistry. A
|March 17, 2009
PubMed
Summary
This summary is machine-generated.

Silicon carbide (SiC) shows promise as a protective coating for steel. DFT calculations reveal SiC adheres strongly to iron (Fe), exceeding chrome coating performance.

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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding
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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
09:48

Investigating Single Molecule Adhesion by Atomic Force Spectroscopy

Published on: February 27, 2015

Area of Science:

  • Materials Science
  • Surface Science
  • Computational Materials Science

Background:

  • Ceramics like silicon carbide (SiC) possess high melting points and wear resistance, making them suitable for protective coatings.
  • Understanding the adhesion of SiC to metals is crucial for developing advanced protective layers for materials like steel.

Purpose of the Study:

  • To calculate the adhesion strength between SiC and iron (Fe) using computational methods.
  • To investigate the interfacial bonding characteristics at the SiC/Fe interface.
  • To assess the potential of SiC as an adhesion layer in protective coatings.

Main Methods:

  • Periodic density functional theory (DFT) calculations were employed.
  • The generalized gradient approximation (GGA) was used for electronic structure calculations.
  • Calculations considered Si- and C-terminations of SiC(100) and Fe(100) and Fe(110) surfaces.

Main Results:

  • A maximum ideal work of adhesion of 6.51 J/m^2 was predicted at the SiC(100)/Fe(110) interface with C-Fe bonding.
  • This adhesion strength is superior to that of traditional chrome coatings on Fe.
  • Analysis revealed strong covalent bonding and some metallic bonding between Si/C and Fe at the interface.

Conclusions:

  • SiC exhibits strong adhesion to Fe, suggesting its utility as a protective coating material.
  • The calculated adhesion surpasses that of conventional chrome coatings.
  • SiC is a potential candidate for thin adhesion layers in multilayer protective coatings for steel.