Desorption of low-charge-density polyelectrolyte adlayers in aqueous sodium n-dodecyl sulfate solution
2001 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 237, no 1, 104-111 p.Article in journal (Refereed) Published
The association between low-charge-density polyelectrolytes adsorbed onto negatively charged surfaces (mica and silica) and an anionic surfactant, sodium dodecyl sulfate (SDS), has been investigated using surface force measurements, ellipsometry, and XPS. All three techniques show that the polyelectrolyte desorbs when the SDS concentration is high enough. The XPS study indicates that desorption starts at a SDS concentration of ca. 0.1 unit of cmc (8 x 10(-4) M) and that the desorption proceeds progressively as the SDS concentration is increased. Surface force measurements show that for the polyelectrolyte studied here, having 1% of the segments charged, the desorption proceeds without any swelling of the adsorbed layer. This behavior differs from that observed when polyelectrolytes of greater charge density are used.
Place, publisher, year, edition, pages
2001. Vol. 237, no 1, 104-111 p.
polyelectrolyte, desorption, low charge density, SDS, surface forces, XPS, ellipsometry, monte-carlo simulations, poly-electrolyte interactions, anionic surfactant, cationic polyelectrolyte, adsorbed layers, adsorption, interface, force, behavior, micelles
IdentifiersURN: urn:nbn:se:kth:diva-20587DOI: 10.1006/jcis.2001.7444ISI: 000168442900015OAI: oai:DiVA.org:kth-20587DiVA: diva2:339283
QC 201005252010-08-102010-08-10Bibliographically approved