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Influence of surfactants on a pre-adsorbed cationic layer: Removal and modification.

Authors
  • Allen, Finian J1
  • Truscott, Chris L2
  • Welbourn, Rebecca J L3
  • Clarke, Stuart M4
  • 1 Department of Chemistry and BP Institute, University of Cambridge, Cambridge, UK. Electronic address: [email protected]
  • 2 Department of Chemistry and BP Institute, University of Cambridge, Cambridge, UK. Electronic address: [email protected]
  • 3 ISIS Pulsed Neutron Facility, Harwell Science and Innovation Campus, STFC, Rutherford Appleton Laboratory, Didcot, Oxon, UK. Electronic address: [email protected]
  • 4 Department of Chemistry and BP Institute, University of Cambridge, Cambridge, UK. Electronic address: [email protected]
Type
Published Article
Journal
Journal of Colloid and Interface Science
Publisher
Elsevier
Publication Date
Apr 15, 2021
Volume
588
Pages
427–435
Identifiers
DOI: 10.1016/j.jcis.2020.12.047
PMID: 33429339
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Removal of organic species from solid surfaces is a crucial process. The use of oppositely charged surfactants provides a potential method for enhanced removal. Neutron reflectometry has been used to investigate the complex behaviour of a pre-adsorbed and tenacious layer of the cationic surfactant didodecyldimethylammonium bromide (DDAB) on a mica surface, during exposure to different organic species in solution. The anionic surfactant sodium dodecylsulfate (SDS) was shown to be able to remove the cationic layer, but only if anionic micelles were present in solution. To facilitate comparison with the behaviour of a non-ionic surfactant, the direct adsorption of pentaethylene glycol monododecyl ether (C12E5) to mica was also studied; low surface coverage adsorption was seen at the critical micelle concentration and above. C12E5 was then found not to remove the cationic layer, but did include into the layer to some degree. The presence of cationic surfactant on the mica was however shown to significantly modify the adsorption behaviour of the non-ionic surfactant. Copyright © 2020 Elsevier Inc. All rights reserved.

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