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Association of anionic surfactant and physisorbed branched brush layers probed by neutron and optical reflectometry.

Liu, Xiaoyan; Dedinaite, Andra; Nylander, Tommy LU ; Dabkowska, Aleksandra LU ; Skoda, Maximilian; Makuska, Ricardas and Claesson, Per M (2015) In Journal of Colloid and Interface Science 440. p.245-252
Abstract
Pre-adsorbed branched brush layers were formed on silica surfaces by adsorption of a diblock copolymer consisting of a linear cationic block and an uncharged bottle-brush block. The charge of the silica surface was found to affect the adsorption, with lower amounts of the cationic polyelectrolyte depositing on less charged silica. Cleaning under basic conditions rendered surfaces more negatively charged (more negative zeta-potential) than acid cleaning and was therefore used to increase polyelectrolyte adsorption. The structure of adsorbed layers of the diblock copolymer was as determined by neutron reflectometry found to be about 70nm thick and very water rich (97%). Interactions between the anionic surfactant sodium dodecylsulfate (SDS)... (More)
Pre-adsorbed branched brush layers were formed on silica surfaces by adsorption of a diblock copolymer consisting of a linear cationic block and an uncharged bottle-brush block. The charge of the silica surface was found to affect the adsorption, with lower amounts of the cationic polyelectrolyte depositing on less charged silica. Cleaning under basic conditions rendered surfaces more negatively charged (more negative zeta-potential) than acid cleaning and was therefore used to increase polyelectrolyte adsorption. The structure of adsorbed layers of the diblock copolymer was as determined by neutron reflectometry found to be about 70nm thick and very water rich (97%). Interactions between the anionic surfactant sodium dodecylsulfate (SDS) and such pre-adsorbed diblock polymer layers were studied by neutron reflectometry and by optical reflectometry. Optical reflectometry was also used for deducing interactions between the individual blocks of the diblock copolymer and SDS at the silica/aqueous interface. We find that SDS is readily incorporated in the diblock copolymer layer at low SDS concentrations, and preferentially co-localized with the cationic block of the polymer next to the silica surface. At higher SDS concentrations some desorption of polyelectrolyte/surfactant complexes takes place. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Colloid and Interface Science
volume
440
pages
245 - 252
publisher
Elsevier
external identifiers
  • pmid:25460712
  • wos:000346461100031
  • scopus:84911423822
ISSN
1095-7103
DOI
10.1016/j.jcis.2014.11.002
language
English
LU publication?
yes
id
df890096-679d-4e46-8b4e-87d73e6f3f7f (old id 4913021)
date added to LUP
2015-01-12 17:17:01
date last changed
2017-06-11 03:10:13
@article{df890096-679d-4e46-8b4e-87d73e6f3f7f,
  abstract     = {Pre-adsorbed branched brush layers were formed on silica surfaces by adsorption of a diblock copolymer consisting of a linear cationic block and an uncharged bottle-brush block. The charge of the silica surface was found to affect the adsorption, with lower amounts of the cationic polyelectrolyte depositing on less charged silica. Cleaning under basic conditions rendered surfaces more negatively charged (more negative zeta-potential) than acid cleaning and was therefore used to increase polyelectrolyte adsorption. The structure of adsorbed layers of the diblock copolymer was as determined by neutron reflectometry found to be about 70nm thick and very water rich (97%). Interactions between the anionic surfactant sodium dodecylsulfate (SDS) and such pre-adsorbed diblock polymer layers were studied by neutron reflectometry and by optical reflectometry. Optical reflectometry was also used for deducing interactions between the individual blocks of the diblock copolymer and SDS at the silica/aqueous interface. We find that SDS is readily incorporated in the diblock copolymer layer at low SDS concentrations, and preferentially co-localized with the cationic block of the polymer next to the silica surface. At higher SDS concentrations some desorption of polyelectrolyte/surfactant complexes takes place.},
  author       = {Liu, Xiaoyan and Dedinaite, Andra and Nylander, Tommy and Dabkowska, Aleksandra and Skoda, Maximilian and Makuska, Ricardas and Claesson, Per M},
  issn         = {1095-7103},
  language     = {eng},
  pages        = {245--252},
  publisher    = {Elsevier},
  series       = {Journal of Colloid and Interface Science},
  title        = {Association of anionic surfactant and physisorbed branched brush layers probed by neutron and optical reflectometry.},
  url          = {http://dx.doi.org/10.1016/j.jcis.2014.11.002},
  volume       = {440},
  year         = {2015},
}