Adsorption of 12-s-12 gemini surfactants at the silica-aqueous solution interface

Atkin, R., Craig, V. S. J., Wanless, E. J. and Biggs, S. (2003) Adsorption of 12-s-12 gemini surfactants at the silica-aqueous solution interface. Journal of Physical Chemistry B, 107 13: 2978-2985. doi:10.1021/jp026626o


Author Atkin, R.
Craig, V. S. J.
Wanless, E. J.
Biggs, S.
Title Adsorption of 12-s-12 gemini surfactants at the silica-aqueous solution interface
Formatted title
Adsorption of 12-s-12 gemini surfactants at the silica-aqueous solution interface
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
1520-5207
Publication date 2003-04-01
Sub-type Article (original research)
DOI 10.1021/jp026626o
Open Access Status Not yet assessed
Volume 107
Issue 13
Start page 2978
End page 2985
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Formatted abstract
The adsorption of gemini surfactants of the form alkanediyl-α,ω-bis (dodecyldimethylammonium bromide) to a silica substrate is investigated using optical reflectometry (OR) and atomic force microscopy (AFM). The adsorption isotherms and kinetics of adsorption have been determined for spacer sizes of 2, 3, 4, 6, 8, 10, and 12. The maximum surface excess correlates strongly with the size of the spacer group. The smallest spacer size yields the largest surface excess. Soft-contact AFM imaging has shown that flattened ellipsoidal aggregates are present on the surface at the shortest spacer lengths. Images of the adsorbed layer cannot be obtained for spacer sizes greater than 3 because of a strongly attractive force regime. The origin of the attraction is attributed to proximal desorption induced by the approach of the tip toward the substrate. The linear increase in the area per adsorbed molecule with spacer size suggests that the aggregate structures become flattened with increasing spacer size but are otherwise similar.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
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