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Title: Structure of mixed DTAB/DDAB adsorbed layers on quartz: a neutron reflectometry and atomic force microscopy study.
Authors: Blom, A
Warr, GG
Nelson, A
Keywords: Surfactants
Adsorption
Atomic Force Microscopy
Silicon
Neutrons
MICA
Sediment-Water Interfaces
Interfaces
Bromides
Issue Date: 15-Nov-2007
Publisher: Elsevier
Citation: Blom, A., Warr, G. G., & Nelson, A. (2007). Structure of mixed DTAB/DDAB adsorbed layers on quartz: a neutron reflectometry and atomic force microscopy study. Colloids and Surfaces a-Physicochemical and Engineering Aspects, 310(1-3), 1-8.
Abstract: The structure and composition of adsorbed layers formed by mixtures of dodecyltrimethylammonium bromide (DTAB) and didodecyldimethylammonium bromide (DDAB) on quartz have been determined using a combination of atomic force microscopy and neutron reflectometry. The mixed adsorbed layer was found to be substantially enriched in DDAB, stabilising the formation of a laterally unstructured bilayer even when there is only as little as 1 mol% present in the bulk mixed solute. At even higher DTAB content the adsorbed film morphology gradually transforms to globules over a very narrow composition range. DDAB was found to be significantly excluded from the mixed adsorbed film only after it was completely transformed into globular aggregates, the equilibrium adsorbed layer morphology of DTAB. © 2007, Elsevier Ltd.
URI: http://dx.doi.org/10.1016/j.colsurfa.2007.05.052
http://apo.ansto.gov.au/dspace/handle/10238/1032
ISSN: 0927-7757
Appears in Collections:Journal Articles

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