Hodges, CS, Lincoln, A and Biggs, S (2013) Surfactants at the solid-liquid interface: Measurements at higher concentrations using optical reflectometry. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 434. 164 - 170. ISSN 0927-7757
Abstract
Both adsorbing and non-adsorbing surfactant solutions have been investigated by optical reflectivity (OR) on a hydrophilic silica surface over a wide range of solution concentrations. The use of the OR technique is tested at surfactant concentrations well above those usually employed with this approach. To establish a correlation with the OR response expected from these solutions, a simple additive two-part model is introduced comprising an interfacial term and a bulk solution term. The adsorbing system demonstrated the expected regular adsorption isotherm behaviour at lower solution concentrations, and at higher solution concentrations more closely fitted the bulk solution response. When this bulk response was subtracted from the total OR signal, a constant adsorbed amount was found, validating our two-part model approach. Whilst data obtained from alcohol-water mixtures also showed the expected non-adsorbing system response with the signal arising exclusively from the bulk solution, other systems (sucrose solutions and non-adsorbing sodium dodecylsulphate) showed more complex behaviour even after the solution refractive index changes had been subtracted. The implications of these data for probing depletion effects for these systems are discussed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2013, Elsevier. NOTICE: this is the author’s version of a work that was accepted for publication in Colloids and Surfaces A: Physicochemical and Engineering Aspects. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Colloids and Surfaces A: Physicochemical and Engineering Aspects, 434, 2013. http://dx.doi.org/10.1016/j.colsurfa.2013.05.071 |
Keywords: | Optical reflectometry; sucrose; CTAB; SDS; surfactants |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Particle Science and Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 Mar 2014 11:06 |
Last Modified: | 29 Mar 2018 04:30 |
Published Version: | http://dx.doi.org/10.1016/j.colsurfa.2013.05.071 |
Status: | Published |
Publisher: | Elsevier - |
Identification Number: | 10.1016/j.colsurfa.2013.05.071 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:78252 |