Adsorption studies of a polymerizable surfactant by optical reflectivity and quartz crystal microbalance

Hodges, Chris, Biggs, Simon and Walker, Lynn (2009) Adsorption studies of a polymerizable surfactant by optical reflectivity and quartz crystal microbalance. Langmuir, 25 19: 11503-11508. doi:10.1021/la901321h


Author Hodges, Chris
Biggs, Simon
Walker, Lynn
Title Adsorption studies of a polymerizable surfactant by optical reflectivity and quartz crystal microbalance
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
1520-5827
Publication date 2009-10-06
Sub-type Article (original research)
DOI 10.1021/la901321h
Open Access Status
Volume 25
Issue 19
Start page 11503
End page 11508
Total pages 6
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract A quartz crystal microbalance (QCM) and an optical reflectometer (OR) have been used to investigate the adsorption behavior of two different variants of the surfactant-hydrotropic counterion system, alkane trimethylammonium vinylbenzoate (CnTVB), onto silica surfaces. The C18TVB variant, with a longer hydrocarbon tail, produced a threestage adsorption isotherm in the OR, whereas the C16TVB surfactant showed a two-stage adsorption isotherm. This was explained in terms of the greater degree of hydrophobicity of the C18 carbon chain requiring a significantly higher concentration of surfactant to be present on the surface before any further adsorption can occur. A concentration dependent adsorption rate was observed for both surfactants, with the faster adsorption rate being detected for C18TVB. The OR data showed that each surfactant could be completely rinsed off with the flow of water into the OR cell. This was not observed with the QCM data, where only a partial rinse off was seen. The difference between the two techniques was hypothesized to be due to the ability of the QCM to detect both interfacial and bulk behavior thus complicating the interpretation of the adsorption data.
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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