The adsorption of mixed surfactants at the hydrophilic silica surface from aqueous solution : Studied by specular neutron reflection

Specular neutron reflection has been used to determine the structure and composition of the mixed ionic-non-ionic surfactants adsorbed at the hydrophilic silica solid/water interface. Measurements on two different mixed surfactant systems are reported: the cationic /nonionic mixture of hexadecyltrim...

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Bibliographic Details
Published in:International journal of thermophysics 1999, Vol.20 (1), p.19-34
Main Authors: PENFOLD, J, STAPLES, E. J, TUCKER, I, THOMPSON, L. J, THOMAS, R. K
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Interfaces (materials)
Neutron reflection
Solid-liquid interface
Solutions
Surface active agents
Surface physical chemistry
Surfaces
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Summary:Specular neutron reflection has been used to determine the structure and composition of the mixed ionic-non-ionic surfactants adsorbed at the hydrophilic silica solid/water interface. Measurements on two different mixed surfactant systems are reported: the cationic /nonionic mixture of hexadecyltrimethyl ammonium bromide, C sub(16)TAB, and hexaethylene glycol monododecyl ether, C sub(12)E sub(6), and the anionic/nonionic mixture of sodium dodecyl sulfate, and C sub(12)E sub(6). For the C sub(16)TAB-C sub(12)E sub(6) mixture, pH is shown to have a dramatic effect on the relative affinity for adsorption of the two surfactants at the interface.
ISSN:0195-928X
1572-9567
DOI:10.1023/A:1021413810630