The effect of adsorbed layer surface roughness on the QCM-D response: focus on trapped water
2007 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, no 24, 12436-12444 p.Article in journal (Refereed) Published
The effect of surface roughness on the quartz crystal microbalance with dissipation monitoring (QCM-D) response was investigated with emphasis on determining the amount of trapped water. Surfaces with different nanoroughnesses Were prepared on silica by self-assembly of cationic surfactants with different packing parameters. We used surfactants with quaternary ammonium bromide headgroups: the double-chained didodecyltrimethylammonium bromide (C-12)(2)-DAB (DDAB), the single-chained hexadecyltrimethylammonium bromide C(16)TAB (CTAB), and dodecyltrimethylammonium bromide C(12)TAB (DTAB). The amount of trapped water was obtained from the difference between the mass sensed by QCM-D and the adsorbed amount detected by optical reflectometry. The amount of water, which is sensed by QCM-D, was found to increase with the nanoroughness of the adsorbed layer. The water sensed by QCM-D cannot be assigned primarily to hydration water, because it differs substantially for adsorbed surfactant layers with similar headgroups but with different nanoscale topographies
Place, publisher, year, edition, pages
2007. Vol. 23, no 24, 12436-12444 p.
Adsorption; Cationic surfactants; Energy dissipation; Quartz crystal microbalances; Reflectometers; Surface roughness; Dissipation monitoring; Optical reflectometry; Trapped water; Polymer films
IdentifiersURN: urn:nbn:se:kth:diva-7417DOI: 10.1021/la7014308ISI: 000250976700077ScopusID: 2-s2.0-36649000928OAI: oai:DiVA.org:kth-7417DiVA: diva2:12438
QC 201008092009-08-302009-08-302016-05-18Bibliographically approved