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Characterization of the microenvironments of alkylamidoamine-N-oxide surfactant aggregates by the EPR spin labeling method.
Autorzy
Rok wydania
2012
Czasopismo
Numer woluminu
41
Strony
1210-1223
DOI
10.1007/s10953-012-9859-7
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Spin labeling EPR methods were applied to characterize the local microviscosity and micropolarity of micellar aggregates formed by 3-(alkanoylamino)ethyldimethylamine-N-oxides (alkyl = nonyl, undecyl and tridecyl) in an aqueous environment in the temperature range 297–337 K. Four doxylstearic derivatives: 5-doxylstearate methyl ester (5-DSE), 16-doxylstearate methyl ester (16-DSE), 5-doxylstearic acid (5-DSA) and 16-doxylstearic acid (16-DSA) were used as spin probes to monitor mainly the rotational correlation time τ R and the isotropic hyperfine splitting constant A N. In the case of anisotropic spectra, the order parameter S was also determined. The selected probes were found to be sensitive to the microenvironments whereby it was possible to characterize in detail local changes in composition and micelle formation.
Słowa kluczowe
N-oxide surfactants, Micelle, Electron paramagnetic resonance, Spin probe
Adres publiczny
http://dx.doi.org/10.1007/s10953-012-9859-7
Strona internetowa wydawcy
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