Comparison of oleyl and elaidyl isomer surfactant-counterion systems in drag reduction, rheological properties and nanostructure

Yunying Qi; Ellina Kesselman; David J Hart; Yeshayahu Talmon; Anthony Mateo; Jacques L Zakin

doi:10.1016/j.jcis.2010.10.067

Comparison of oleyl and elaidyl isomer surfactant-counterion systems in drag reduction, rheological properties and nanostructure

J Colloid Interface Sci. 2011 Feb 15;354(2):691-9. doi: 10.1016/j.jcis.2010.10.067. Epub 2010 Nov 8.

Authors

Yunying Qi¹, Ellina Kesselman, David J Hart, Yeshayahu Talmon, Anthony Mateo, Jacques L Zakin

Affiliation

¹ Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH 43210, USA. yunying.qi@gmail.com

PMID: 21126741
DOI: 10.1016/j.jcis.2010.10.067

Abstract

Compared with quaternary ammonium cationic surfactants with saturated alkyl chains, quaternary ammonium cationic surfactants with one double-bond in their alkyl chains, when mixed with appropriate counterions (in certain molar concentration ratios, ξ), can reach much lower effective drag-reduction temperatures, while maintaining the upper drag-reduction temperature limit of the corresponding saturated drag reducing surfactant solutions. No previous study has compared the effects of cis- vs. trans-unsaturated alkyl hydrocarbon tail configurations (oleyl vs. elaidyl) trimethyl ammonium chloride cationic surfactants at different counterion/surfactant concentration ratios on micellar nanostructures, (1)H NMR spectra and on rheological and drag-reduction behavior of their solutions. Since neither pure oleyl (cis-) nor elaidyl (trans-) trimethyl ammonium chloride surfactants are commercially available, they were synthesized and their 5mM solutions with NaSal counterion at concentrations of 5mM, 7.5mM and 12.5mM were studied.