Contrast variation for explaining pD-dependent LCST-alterations in dye-surfactant solutions by locating the dye in dye-surfactant assemblies
Alkyl ethoxylate surfactants CmEn with m alkyl chain carbon atoms and n ethylene glycol groups are an integral part of industrial and personal consumer products. A common feature of these surfactants in aqueous solution is a lower critical solution temperature (LCST). Addition of a pD-responsive azo dye was observed to increase, decrease or have no effect on the LCST of C12E5 solutions, dependent on solution pD. To explain the mechanism behind this observation, we propose to study the influence of pD, temperature and dye concentration on the morphology of dye-C12E5 micelles with small-angle neutron scattering. Furthermore, we aim to localize the dye within the C12E5 micelles by matching the C12E5 surfactant to the D2O solvent in a contrast variation experiment. This will permit the direct correlation of the dye charge (different states of protonation due to pD changes), its localization within the surfactant micelle and its influence on solution LCST.
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The recommended format for citing this dataset in a research publication is in the following format:
MUELLER Wenke; HUBER Klaus; NOECKER Bernd and SCHWEINS Ralf. (2023). Contrast variation for explaining pD-dependent LCST-alterations in dye-surfactant solutions by locating the dye in dye-surfactant assemblies. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-687
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