On the mesoscopic origins of high viscosities in some polyelectrolyte-surfactant mixtures

dc.contributor.authorHoffmann, Ingo
dc.contributor.authorFarago, Bela
dc.contributor.authorSchweins, Ralf
dc.contributor.authorFalus, Peter
dc.contributor.authorSharp, Melissa
dc.contributor.authorPrévost, Sylvain
dc.contributor.authorGradzielski, Michael
dc.date.accessioned2020-05-27T09:55:00Z
dc.date.available2020-05-27T09:55:00Z
dc.date.issued2015-08-18
dc.descriptionThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in J. Chem. Phys. 143, 074902 (2015) and may be found at https://doi.org/10.1063/1.4928583.en
dc.description.abstractOppositely charged polyelectrolyte (PE) surfactant mixtures allow the control of rheological parameters of a solution even at fairly low concentrations. For example, addition of 0.3 wt. % of anionic surfactant to a 1 wt. % solution of the polycation JR 400 increases the viscosity by 4 orders of magnitude. Recently, we could show that this increase is related to the formation of mixed, rod-like PE/surfactant aggregates which interconnect several polyelectrolyte chains [Hoffmann et al., Europhys. Lett. 104, 28001 (2013)]. In this paper, we refine our structural model of the aggregates to obtain a more consistent picture of their internal structure for different anionic surfactants. Combining small angle neutron scattering (SANS) and neutron spin-echo (NSE) allows us to determine the size of the aggregates. By comparing different contrasts, the internal structure of the aggregates can be elucidated and it is seen that the PE in the aggregates retains a relatively high freedom of movement. We proceeded to investigate the influence of the surfactant concentration and the surfactant type on structure and dynamics of the mixed aggregates. It is seen that the structural parameters of the aggregates depend very little on the surfactant concentration and headgroup. However, it is crucial to incorporate a sufficient amount of PE in the aggregates to increase the viscosity of the aggregates. By comparing viscous samples at 1 wt. % PE concentration with samples at a PE concentration of 0.3 wt. %, where no significant increase in viscosity is observed, we find that similar aggregates are formed already at this lower PE concentrations. However, the amount of PE incorporated in them is insufficient to interconnect several PE chains and therefore, they do not increase viscosity. So, our detailed investigation combining contrast variation SANS and NSE does not only allow to explain the viscosity behavior but also to deduced detailed information regarding the structures and the dynamics especially of the polyelectrolyte within the complexes.en
dc.description.sponsorshipBMBF, 05K13KT1, Probenumgebung und paralle Charakterisierung bei hochpräzisen Neutronen Spin-Echo (NSE) Messungen an komplexen Systemen der weichen Materieen
dc.identifier.eissn1089-7690
dc.identifier.issn0021-9606
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11232
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-10120
dc.language.isoen
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subject.ddc540 Chemie und zugeordnete Wissenschaftende
dc.subject.othermicrogelsen
dc.subject.otherneutron scatteringen
dc.subject.otherionsen
dc.subject.otherpropertiesen
dc.subject.otherpolyelectrolytesen
dc.subject.otherentropyen
dc.subject.otherneutron spin-echoen
dc.subject.otherpolymersen
dc.subject.otherelectromagnetic interactionsen
dc.subject.othersupramolecular assemblyen
dc.titleOn the mesoscopic origins of high viscosities in some polyelectrolyte-surfactant mixturesen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber74902
dcterms.bibliographicCitation.doi10.1063/1.4928583
dcterms.bibliographicCitation.issue7
dcterms.bibliographicCitation.journaltitleThe Journal of Chemical Physicsen
dcterms.bibliographicCitation.originalpublishernameAmerican Institute of Physics (AIP)en
dcterms.bibliographicCitation.originalpublisherplaceMelville, NYen
dcterms.bibliographicCitation.volume143
tub.accessrights.dnbfree
tub.affiliationFak. 2 Mathematik und Naturwissenschaften>Inst. Chemie>FG Physikalische Chemie / Molekulare Materialwissenschaftende
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Physikalische Chemie / Molekulare Materialwissenschaftende
tub.affiliation.instituteInst. Chemiede
tub.publisher.universityorinstitutionTechnische Universität Berlinde
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