Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/33952

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Title
Zeta-potentials of self-assembled surface micelles of ionic surfactants adsorbed at hydrophobic graphite surfaces
Author/Creator
Paruchuri, Vamsi K.;  Nguyen, Anh V.;  Miller, Jan D.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
The zeta-potentials of the self-assembled surface ionic surfactants (sodium dodecyl sulfate—SDS and hexadecyltrimethyl ammonium bromide—CTAB) on graphite surfaces were determined both from streaming potential and electrophoretic mobility measurements. The adsorption of the surfactants at graphite–liquid interfaces has been studied using atomic force microscopy (AFM) soft-contact imaging which shows the formation of linear, parallel hemicylinders with headgroups oriented towards the solution. The magnitude of the zeta-potential increased with an increase in surfactant concentration, reaching a constant value at a concentration corresponding to the point of surface micelle formation as confirmed from AFM imaging. The streaming potential and electrophoretic mobility measurements showed that the zeta-potentials of SDS and CTAB surface micelles adsorbed at the graphite surface were about −75 and +70 mV, respectively, well in agreement with the values reported for bulk phase micelles in the literature.
Relation
Colloids and Surfaces Vol. 250, Issue 1-3, p. 519-526
Publisher Link
http://dx.doi.org/10.1016/j.colsurfa.2004.04.098
Date
2004
Publisher
Elsevier BV
Keyword(s)
surface micelle;  zeta-potential;  streaming potential;  electrophoresis;  SDS;  CTAB;  graphite;  self-assembly
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/33952
Identifier
ISSN:0927-7757
Reviewed
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Subject
"Colloids and Surfaces"
 
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