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Adhesion between silica surfaces due to hydrogen bonding

Bowen, James; Rossetto, Hebert L. and Kendall, Kevin (2016). Adhesion between silica surfaces due to hydrogen bonding. Surface Topography: Metrology and Properties, 4(3) 034001.

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The adhesion between surfaces can be enhanced significantly by the presence of hydrogen bonding. Confined water at the nanoscale can display behaviour remarkably different to bulk water due to the formation of hydrogen bonds between two surfaces. In this work we investigate the role of confined water on the interaction between hydrophilic surfaces, specifically the effect of organic contaminants in the aqueous phase, by measuring the peak adhesive force and the work of adhesion. Atomic force microscope cantilevers presenting hemispherical silica tips were interacted with planar single crystals of silica in the presence of dimethylformamide, ethanol, and formamide; solution compositions in the range 0-100 mol% water were investigated for each molecule. Each molecule was chosen for its ability to hydrogen bond with water molecules, with increasing concentrations likely to disrupt the structure of surface-bound water layers. With the exception of aqueous solutions containing low concentrations of ethanol, all molecules decreased the ability of confined water to enhance the adhesion between the silica surfaces in excess of the predicted theoretical adhesion due to van der Waals forces. The conclusion was that adhesion depends strongly on the formation of a hydrogen-bonding network within the water layers confined between the silica surfaces.

Item Type: Journal Item
Copyright Holders: 2016 IOP Publishing
ISSN: 2051-672X
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetUniversity of Birmingham
Keywords: adhesion; atomic force microscopy; dimethylformamide; ethanol; formamide; silica; water
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 46322
Depositing User: James Bowen
Date Deposited: 07 Jun 2016 13:40
Last Modified: 01 May 2019 18:39
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