Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Charged Soft Matter, Polyelectrolytes and Ionic Liquids I
CPP 32.2: Vortrag
Mittwoch, 3. April 2019, 09:45–10:00, H13
Adsorption Behaviour of oppositely charged Polyelectrolyte/Surfactant Mixtures: Influence of Salt — •Larissa Braun and Regine von Klitzing — Department of Physics, TU Darmstadt, Darmstadt, Germany
The surface properties of oppositely charged polyelectrolyte/surfactant mixtures play an important role in colloidal dispersions (foams, emulsions) e.g. for cosmetics, cleaning products and in food technology. The present study addresses the influence of the ionic strength on the surface tension of polyanions (NaPSS or sPSO2-220) mixed with cationic C14TAB. Depending on the counterion of the polyanion LiBr or NaBr is used.
In case of NaPSS NaBr reduces the surface tension over the whole studied polyelectrolyte concentration range (10-5 * 10-3 monoM) and broadens the increase of surface tension at the bulk stoichiometric mixing point (BSMP) of polyelectrolyte and surfactant. In contrast, LiBr reduces the surface tension of sPSO2-220 only above the BSMP.
These finding will be correlated the surface excesses and surface structure of the polyelectrolyte/surfactant mixtures obtained by neutron reflectometry measurements.