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Related Concept Videos

Adhesion01:14

Adhesion

40.8K
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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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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Cohesion01:07

Cohesion

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
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Investigating Single Molecule Adhesion by Atomic Force Spectroscopy
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Water-Mediated Epoxy/Surface Adhesion: Understanding the Interphase Region.

Charlie R Wand1,2, Simon Gibbon3, Peter Visser4

  • 1Natural Sciences, College of Engineering, Mathematics and Physical Science, Streatham Campus, University of Exeter, North Park Road, EX4 4QF, Exeter, UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 30, 2022
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Summary
This summary is machine-generated.

Water

Keywords:
epoxy resininterfacesmolecular dynamicspolymerssimulation

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Area of Science:

  • Materials Science
  • Corrosion Science

Background:

  • Epoxy resin coatings are vital for corrosion protection.
  • Water presence can negatively impact epoxy coating adhesion.
  • However, small water amounts may enhance epoxy-substrate interactions.

Purpose of the Study:

  • Investigate the role of water in the epoxy/metal oxide interphase region.
  • Understand how water concentration and substrate type affect adhesion.
  • Explore the molecular mechanisms of water's influence on adhesion.

Main Methods:

  • Utilized molecular simulations to model the interphase.
  • Analyzed epoxy precursor and metal oxide substrate interactions.
  • Varied water concentrations to observe effects on adhesion.

Main Results:

  • Water accumulates at the epoxy/substrate interface.
  • High water concentrations (9 wt%) weaken adhesion universally.
  • Low water concentrations show substrate-dependent effects: adhesion weakened on hematite, enhanced on goethite.
  • Water at 3 wt% enhances goethite adhesion, causing interfacial densification.

Conclusions:

  • Water's effect on epoxy adhesion is concentration and substrate-dependent.
  • Low water levels can be beneficial for specific substrates like goethite.
  • Molecular simulations provide insights into interfacial phenomena in protective coatings.