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The Effect of Dissolved Gases on the Short-Range Attractive Force between Hydrophobic Surfaces in the Absence of Nanobubble Bridging

Azadi, Mehdi; Nguyen, Anh V; Yakubov, Gleb E.

The Effect of Dissolved Gases on the Short-Range Attractive Force between Hydrophobic Surfaces in the Absence of Nanobubble Bridging Thumbnail


Authors

Mehdi Azadi

Anh V Nguyen



Abstract

The short-range attractive forces between hydrophobic surfaces are key factors in a wide range of areas such as protein folding, lipid self-assembly, and particle-bubble interaction such as in industrial flotation. Little is certain about the effect of dissolved (well-controlled) gases on the interaction forces, in particular in those systems where the formation of surface nanobubble bridges is suppressed. Here, we probe the short-range attractive force between hydrophobized silica surfaces in aqueous solutions with varying but well-controlled isotherms of gas solubility. The first contact approach force measurement method using AFM shows that decreasing gas solubility results in a decrease of the force magnitude as well as shortening of its range. The behavior was found to be consistent across all four aqueous systems and gas solubilities tested. Using numerical computations, we corroborate that attractive force can be adequately explained by a multilayer dispersion force model, which accounts for an interfacial gas enrichment (IGE), that results in the formation of a dense gas layer (DGL) adjacent to the hydrophobic surface. We found that the DGL on the hydrophobic surface is affected only by the concentration of dissolved gases and is independent of the salt type, used to control the gas solubility, which excludes the effect of electrical double-layer interactions on the hydrophobic force.

Citation

Azadi, M., Nguyen, A. V., & Yakubov, G. E. (2020). The Effect of Dissolved Gases on the Short-Range Attractive Force between Hydrophobic Surfaces in the Absence of Nanobubble Bridging. Langmuir, 36(34), 9987-9992. https://doi.org/10.1021/acs.langmuir.0c00117

Journal Article Type Article
Acceptance Date May 18, 2020
Online Publication Date Aug 3, 2020
Publication Date Sep 1, 2020
Deposit Date May 18, 2020
Publicly Available Date Mar 28, 2024
Journal Langmuir : the ACS journal of surfaces and colloids
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 36
Issue 34
Pages 9987-9992
DOI https://doi.org/10.1021/acs.langmuir.0c00117
Keywords force measurement; atomic force microscopy; hydrophobic interaction; salts
Public URL https://nottingham-repository.worktribe.com/output/4462623
Publisher URL https://pubs.acs.org/doi/10.1021/acs.langmuir.0c00117
Additional Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acs.langmuir.0c00117.

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