Interfacial interaction between sodium dodecyl sulfate and hydrophobically modified ethyl(hydroxyethyl)cellulose. A surface force study
2001 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 17, no 5, 1506-1510 p.Article in journal (Refereed) Published
The effect of addition of sodium dodecyl sulfate (SDS) to a layer of hydrophobically modified ethyl(hydroxyethyl)cellulose (HM-EHEC) preadsorbed on hydrophobized mica has been studied with an interferometric surface force apparatus (SFA). The force between the surfaces was always repulsive on both compression and separation. The range of this force, which is 1500 Angstrom for the HM-EHEC layers, undergoes a non-monotonic change on addition of SDS. Initially, at low SDS concentrations the layer expand, while at higher surfactant concentrations a contraction of the adsorbed layer is observed. At 1.5 mM SDS the range of the force is at maximum, while at 6 mM SDS the layer is significantly thinner than before addition of SDS. The results are discussed in terms of polymer-surfactant interfacial association and competitive adsorption. The data obtained by surface force measurements agree qualitatively with ellipsometry findings on the same system.
Place, publisher, year, edition, pages
2001. Vol. 17, no 5, 1506-1510 p.
phase-behavior, cationic polyelectrolyte, poly(ethylene oxide), anionic surfactant, neutron reflection, nonionic polymer, water-interface, adsorbed layers, adsorption, cellulose
IdentifiersURN: urn:nbn:se:kth:diva-20414ISI: 000167290800030OAI: oai:DiVA.org:kth-20414DiVA: diva2:339109
QC 20100525 NR 201408042010-08-102010-08-102012-02-10Bibliographically approved