期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 354, 期 2, 页码 691-699出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.10.067
关键词
Drag reduction; Rheology; Nanostructure; NMR; Unsaturated quaternary ammonium cationic surfactant (oleyl vs. elaidyl)
资金
- American Chemical Society
- Ohio State University
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, xi), 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 theological 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 5 mM solutions with NaSaI counterion at concentrations of 5 mM, 7.5 mM and 12.5 mM were studied. (C) 2010 Elsevier Inc. All rights reserved.
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