Influence of the Surfactant Head Group on the Viscosity in Oppositely Char- ged Polyelectrolyte Surfactant Complexes
Oppositely charged polyelectrolyte (PE) surfactant complexes (PESCs) have attracted much interest over the past decades. Not last because of their relevance in numerous household applications such as detergency and paints, or as rheological modifiers. After having found out previously that mixtures of SDS and the cationic cellulose ether JR 400 form viscous networks with mixed rodlike aggregates as junctions, we proceeded to investigate mixtures of JR 400 and sodium dodecyl sulphate (SDP) where the headgroup bears 2 charges, which should hinder the formation of rodlike aggregates due to packing parameter constraints and in fact it is seen by rheology that the viscosity is lower than in comparable solutions with SDS but SANS showed the formation of rodlike aggregates. Their length can not be determined from SANS due to an overlap with the scattering from large clusters. Here, we want to use NSE to determine the length of the aggregates from their diffusion coefficient measured by NSE and their radius, which is known from SANS to answer the question, if the lower viscosity in SDP/JR 400 is due to the formation of shorter and therefore weaker mixed aggregates
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HOFFMANN Ingo; DEL SORBO Giuseppe Rosario and SCHNECK Emanuel. (2019). Influence of the Surfactant Head Group on the Viscosity in Oppositely Char- ged Polyelectrolyte Surfactant Complexes. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-562
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