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@ARTICLE{Hoffmann:819213,
author = {Hoffmann, Ingo and Simon, Miriam and Farago, Bela and
Schweins, Ralf and Falus, Peter and Holderer, Olaf and
Gradzielski, Michael},
title = {{S}tructure and dynamics of polyelectrolyte surfactant
mixtures under conditions of surfactant excess},
journal = {The journal of chemical physics},
volume = {145},
number = {12},
issn = {1089-7690},
address = {Melville, NY},
publisher = {American Institute of Physics},
reportid = {FZJ-2016-04921},
pages = {124901},
year = {2016},
abstract = {Oppositely charged polyelectrolyte (PE) surfactant mixtures
can self-assemble into a large variety of mesoscopic
structures, so-called polyelectrolyte surfactant complexes
(PESCs). These structures directly affect the macroscopic
behavior of such solutions. In this study, we investigated
mixtures of the cationically charged PE JR 400 and the
anionic surfactant SDS with the help of different neutron
scattering and fluorescence methods. While an excess of PE
charges in semi-dilute solutions causes an increase of
viscosity, it has been observed that an excess of surfactant
charges reduces the viscosity while precipitation is
observed at charge equilibrium. The increase in viscosity
had been investigated before and was attributed to the
formation of cross links between PE chains. In this
publication we focus our attention on the reduction of
viscosity which is observed with an excess of surfactant
charges. It is found that the PE chains form relatively
large and densely packed clusters near the phase boundary on
the surfactant rich side, thereby occupying less space and
reducing the viscosity. For even higher surfactant
concentrations, individual surfactant decorated PE chains
are observed and their viscosity is found to be similar to
that of the pure PE},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
experiment = {EXP:(DE-MLZ)J-NSE-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000385562600062},
doi = {10.1063/1.4962581},
url = {https://juser.fz-juelich.de/record/819213},
}