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A small-angle neutron and static light scattering study of micelles formed in aqueous mixtures of a nonionic alkylglucoside and an anionic surfactant
Department of Pharmacy, Pharmaceutical Physical Chemistry, Uppsala University.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
GKSS Research Centre, Geesthacht.
2005 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 109, no 25, 12387-12393 p.Article in journal (Refereed) Published
Abstract [en]

The size and shape of micelles formed in aqueous mixtures of the anionic surfactant sodium dodecyl sulfate (SDS) and the nonionic sugar-based surfactant n-decyl beta-D-glucopyranoside (C(10)G) at different concentrations of added salt have been investigated with small-angle neutron and static light scattering. Rather small prolate ellipsoidal micelles form in the absence of added salt and at [NaCl] = 10 mM in D2O. The micelles grow considerably in length to large rods as the electrolyte concentration is raised to [NaCl] = 0.1 M. In excess of nonionic surfactant ([SDS]/[C(10)G] = 1:3) at [NaCl] = 0.1 M in D2O, several thousands of Angstroms long wormlike micelles are observed. Most interestingly, a conspicuously large isotope solvent effect was observed from static light scattering data according to which micelles formed at [SDS]/[C(10)G] = 1:3 and [NaCl] = 0.1 M in H2O are at least five times smaller than micelles formed in the corresponding samples in D2O.

Place, publisher, year, edition, pages
2005. Vol. 109, no 25, 12387-12393 p.
Keyword [en]
Deuterium, Electrolytes, Hydrophobicity, Light scattering, Negative ions, Neutron scattering, Phase diagrams, Sodium compounds, Surface active agents, Alkylglucoside, Anionic surfactants, Phase boundaries, Sodium dodecyl sulfate (SDS), Micelles, glucose, ion, surfactant, alkylation, article, chemistry, micelle, neutron, Alkylation, Glucose, Ions, Micelles, Neutrons, Surface-Active Agents
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-6676DOI: 10.1021/jp051113dISI: 000230122900025Scopus ID: 2-s2.0-22744454078OAI: oai:DiVA.org:kth-6676DiVA: diva2:11452
Note
QC 20100901. Tidigare titel: A Small-Angle Neutron Scattering Study of Micelles Formed in Aqueous Mixtures of Nonionic Alkylglucoside and an Anionic Surfactant. Titel ändrad 20100901.Available from: 2005-09-22 Created: 2005-09-22 Last updated: 2010-09-01Bibliographically approved
In thesis
1. Self assembly of surfactants and polyelectrolytes in solution and at interfaces
Open this publication in new window or tab >>Self assembly of surfactants and polyelectrolytes in solution and at interfaces
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis focuses on the study of the interactions between polyelectrolytes and surfactants in aqueous solutions and at interfaces, as well as on the structural changes these molecules undergo due to that interaction. Small–angle neutron scattering, dynamic, and static light scattering were the main techniques used to investigate the interactions in bulk. The first type of polymer studied was a negatively charge glycoprotein (mucin); its interactions with ionic sodium alkyl sulfate surfactants and nonionic surfactants were determined. This system is of great relevance for several applications such as oral care and pharmaceutical products, since mucin is the main component of the mucus layer that protects the epithelial surfaces (e.g. oral tissues). Sodium dodecyl sulfate (SDS) on the other hand, has been used as foaming agent in tooth pastes for a very long time. In this work it is seen how SDS is very effective in dissolving the large aggregates mucin forms in solution, as well as in removing preadsorbed mucin layers from different surfaces. On the other hand, the nonionic surfactant n-dodecyl β-D-maltopyranoside (C12-mal), does not affect significantly the mucin aggregates in solution, neither does it remove mucin effectively from a negatively charge hydrophilic surface (silica). It can be suggested that nonionic surfactants (like the sugar–based C12-mal) could be used to obtain milder oral care products. The second type of systems consisted of positively charged polyelectrolytes and a negatively charged surfactant (SDS). These systems are relevant to a wide variety of applications ranging from mining and cleaning to gene delivery therapy. It was found that the interactions of these polyelectrolytes with SDS depend strongly on the polyelectrolyte structure, charge density and the solvent composition (pH, ionic strength, and so on). Large solvent isotopic effects were found in the interaction of polyethylene imine (PEI) and SDS, as well as on the interactions of this anionic surfactant and the sugar–based n-decyl β-D-glucopyranoside (C10G1). These surfactants mixtures formed similar structures in solutions to the ones formed by some of the polyelectrolytes studied, i.e. ellipsoidal micelles at low electrolyte concentration and stiff rods, at high electrolyte and SDS concentrations.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 71 p.
Series
Trita-YTK, ISSN 1650-0490 ; 2005:02
Keyword
Surfactant, polyelectrolyte, small–angle neutron scattering, static light scattering, dynamic light scattering, polyelectrolyte–surfactant association, protein
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-425 (URN)91-7178-127-7 (ISBN)
Public defence
2005-09-30, Sal D3, Lindstedtsvägen 5, 09:00
Opponent
Supervisors
Note
QC 20100901Available from: 2005-09-22 Created: 2005-09-22 Last updated: 2010-09-01Bibliographically approved

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