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Nuclear magnetic resonance and small-angle neutron scattering studies of anionic surfactants with macrocounterions: Tetramethylammonium dodecyl sulfate
KTH, Skolan för kemivetenskap (CHE), Kemi, Fysikalisk kemi.
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2005 (Engelska)Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 109, nr 33, s. 15775-15779Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Micellar solutions of tetramethylammonium dodecyl sulfate have been studied to determine the degree of counterion binding. Tetramethylammonium chloride was added over a wide range of surfactant concentrations such that the total concentration of tetramethylammonium ions in solution remained constant. Small angle neutron scattering experiments showed a constancy in aggregation number across this series, consistent with the constant C-aq concept of Bales et al. (J. Phys. Chent. B 2001, 105, 6798). Pulsed-field gradient and electrophoretic NMR experiments were used to determine the degree of counterion dissociation, alpha, which was found to be 0.33. This value is in contrast to the value from conductivity measurements (alpha = 0.2), but supports the concept of an aggregation number based definition of alpha.

Ort, förlag, år, upplaga, sidor
2005. Vol. 109, nr 33, s. 15775-15779
Nyckelord [en]
aggregation number, counterion, micelles, sodium, ionization, binding, growth, nmr
Identifikatorer
URN: urn:nbn:se:kth:diva-14991DOI: 10.1021/jp050597aISI: 000231426000018Scopus ID: 2-s2.0-24944578308OAI: oai:DiVA.org:kth-14991DiVA, id: diva2:333032
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QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Stilbs, Peter
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Fysikalisk kemi
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Journal of Physical Chemistry B

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