Please use this identifier to cite or link to this item:
For citation please use:
Main Title: Structure and dynamics of polyelectrolyte surfactant mixtures under conditions of surfactant excess
Author(s): Hoffmann, Ingo
Simon, Miriam
Farago, Bela
Schweins, Ralf
Falus, Peter
Holderer, Olaf
Gradzielski, Michael
Type: Article
Language Code: en
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.
Issue Date: 22-Sep-2016
Date Available: 27-May-2020
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): neutron scattering
fluorescent dye
fluid dynamics
phase transitions
supramolecular assembly
Sponsor/Funder: BMBF, 05K13KT1, Probenumgebung und paralle Charakterisierung bei hochpräzisen Neutronen Spin-Echo (NSE) Messungen an komplexen Systemen der weichen Materie
Journal Title: The Journal of Chemical Physics
Publisher: American Institute of Physics (AIP)
Publisher Place: Melville, NY
Volume: 145
Issue: 12
Article Number: 124901
Publisher DOI: 10.1063/1.4962581
EISSN: 1089-7690
ISSN: 0021-9606
Notes: This 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. 145, 124901 (2016) and may be found at
Appears in Collections:FG Physikalische Chemie / Molekulare Materialwissenschaften » Publications

Files in This Item:
Format: Adobe PDF | Size: 1.57 MB
DownloadShow Preview

Item Export Bar

Items in DepositOnce are protected by copyright, with all rights reserved, unless otherwise indicated.