Surfactants at the solid-liquid interface: Measurements at higher concentrations using optical reflectometry

Hodges, Chris S., Lincoln, Alex and Biggs, Simon (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. doi:10.1016/j.colsurfa.2013.05.071

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Author Hodges, Chris S.
Lincoln, Alex
Biggs, Simon
Title Surfactants at the solid-liquid interface: Measurements at higher concentrations using optical reflectometry
Journal name Colloids and Surfaces A: Physicochemical and Engineering Aspects   Check publisher's open access policy
ISSN 0927-7757
1873-4359
Publication date 2013-10
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.colsurfa.2013.05.071
Open Access Status
Volume 434
Start page 164
End page 170
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
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.
Keyword Optical reflectometry
Sucrose, CTAB, SDS
Surfactants
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
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