Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 478, Issue -, Pages 365-373Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.06.015
Keywords
Mica; Silica; Neutron reflection; DDAB; Didodecyldimethylammonium bromide; Surfactant; Adsorption
Categories
Funding
- BP [RG63491]
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The layer structure of the dichain alkyl ammonium surfactant, didodecyldimethylammonium bromide (DDAB), adsorbed from water on to silica and mica surfaces has been determined using neutron reflection. Although sometimes considered interchangeable surfaces for study, we present evidence of significant differences in the adsorbed layer structure below the critical micelle concentration. A complete DDAB bilayer was assembled at the water/mica interface at concentrations below the critical micelle concentration (CMC). In contrast it is not until the CMC was reached that the complete bilayer structure formed on the oxidised silicon crystal. Removal of the complete bilayer on both surfaces was attempted by both washing and ion exchange yet the adsorbed structure proved tenacious. (C) 2016 Elsevier Inc. All rights reserved.
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