A comparison of didodecyldimethylammonium bromide adsorbed at mica/water and silica/water interfaces using neutron reflection

Lucy R. Griffin; Kathryn L. Browning; Chris L. Truscott; Luke A. Clifton; John Webster; Stuart M. Clarke

doi:10.1016/j.jcis.2016.06.015

A comparison of didodecyldimethylammonium bromide adsorbed at mica/water and silica/water interfaces using neutron reflection

Lucy R. Griffin, Kathryn L. Browning, Chris L. Truscott, Luke A. Clifton, John Webster, Stuart M. Clarke^*

^*Corresponding author for this work

14 Citations (Scopus)

Abstract

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.

Original language	English
Journal	Journal of Colloid and Interface Science
Volume	478
Pages (from-to)	365-373
Number of pages	9
ISSN	0021-9797
DOIs	https://doi.org/10.1016/j.jcis.2016.06.015
Publication status	Published - 15 Sept 2016

Keywords

Adsorption
DDAB
Didodecyldimethylammonium bromide
Mica
Neutron reflection
Silica
Surfactant

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10.1016/j.jcis.2016.06.015

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title = "A comparison of didodecyldimethylammonium bromide adsorbed at mica/water and silica/water interfaces using neutron reflection",

abstract = "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.",

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T1 - A comparison of didodecyldimethylammonium bromide adsorbed at mica/water and silica/water interfaces using neutron reflection

AU - Griffin, Lucy R.

AU - Browning, Kathryn L.

AU - Truscott, Chris L.

AU - Clifton, Luke A.

AU - Webster, John

AU - Clarke, Stuart M.

PY - 2016/9/15

Y1 - 2016/9/15

N2 - 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.

AB - 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.

KW - Adsorption

KW - DDAB

KW - Didodecyldimethylammonium bromide

KW - Mica

KW - Neutron reflection

KW - Silica

KW - Surfactant

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U2 - 10.1016/j.jcis.2016.06.015

DO - 10.1016/j.jcis.2016.06.015

M3 - Journal article

AN - SCOPUS:84974588851

SN - 0021-9797

VL - 478

SP - 365

EP - 373

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

ER -

A comparison of didodecyldimethylammonium bromide adsorbed at mica/water and silica/water interfaces using neutron reflection

Abstract

Keywords

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