Direct visualisation of mesh phases at the solid/solution interface by AFM and neutron reflectometry
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Date
2005-11-27
Journal Title
Journal ISSN
Volume Title
Publisher
The Bragg Institute, Australian Nuclear Science and Technology Organisation
Abstract
Using soft-contact AFM imaging, the adsorbed layer structure of mixed solutions of single-chained dodecyltrimethylammonium bromide (DTAB) and double-chained didodecyldimethylammonium bromide (DDAB) at varying compositions has been studied. On quartz, the observed morphologies as composition was varied from DDAB-rich mixtures to DTAB-rich mixtures changed from a bilayer -> mesh -> rods -> globules. This novel mesh structure is consistent with the average curvature progression from bilayer to rods, and consists of densely branched rods. There was a narrow solution composition over which this mesh structure was observed and a fractional change in solution composition resulted in a film transformation to rods. Neutron reflectometry experiments on multiple contrasts have been performed in ISIS and at ANSTO and confirm the curvature sequence observed using AFM. The composition of the mixed film was determined as were adsorbed amounts, film thicknesses and surface coverages. Despite there being an excess of DTAB in solution, the surface was very enriched in DDAB for the two mixed films. © 2005 The Authors
Description
Physical copy held by ANSTO Library at DDC 539.7217/2
Keywords
Dispersions, Halogen compounds, Reactors, Materials, Minerals, Optical properties, Organic compounds, Atomic force microscopy
Citation
Blom, A., Warr, G. G., & Nelson, A. (2005). Direct visualisation of mesh phases at the solid/solution interface by AFM and neutron reflectometry. Paper presented at the Eighth International Conference on Neutron Scattering ICNS 2005: "Neutrons for structure and dynamics - a new era", Sydney Convention & Exhibition Centre, Sydney, Australia, 27 November-2 December 2005. In Final Programme and Abstract Book, (pp. 135).