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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
Summary
Water
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.
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