Micellar kinetics of a fluorosurfactant through stopped-flow NMR
2006 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 22, no 5, 2002-2004 p.Article in journal (Refereed) Published
F-19 NMR chemical shifts and transverse relaxation times T, were measured as a function of time after quick stopped-flow dilution of aqueous solutions of sodium perfluorooctanoate (NaPFO) with water, Different initial concentrations of micellar solution and different proportions of mixing were tested. Previous stopped-flow studies by time-resolved small-angle X-ray scattering (TR-SAXS) detection indicated a slow (similar to 10 s) micellar relaxation kinetics in NaPFO solutions. In contrast, no evidence of any comparable slow (> 100 ms) relaxation process was found in our NMR studies. Possible artifacts of stopped-flow experiments are discussed as well as differences between NMR and SAXS detection methods. Upper bounds on the relative weight of a slow relaxation process are given within existing kinetic theories of micellar dissolution.
Place, publisher, year, edition, pages
2006. Vol. 22, no 5, 2002-2004 p.
Kinetic theory, Nuclear magnetic resonance spectroscopy, Relaxation processes, Surface active agents
IdentifiersURN: urn:nbn:se:kth:diva-5531DOI: 10.1021/la0529660ISI: 000235744500013ScopusID: 2-s2.0-33644911175OAI: oai:DiVA.org:kth-5531DiVA: diva2:9927
QC 201009222006-04-052006-04-052010-09-22Bibliographically approved