Time-resolved observation of the formation of amphiphilic surfactantsmicelles using neutron rheo-reflectometry
For the proposed experiment the tri-block copolymer Pluronic P123 (EO19– PO69–EO19) is used consisting of propylene oxide (PO) and ethylene oxide (EO). Being an amphiphile, P123 forms core-shell micelles (core=PPO, shell=PEO) in polar solvents depending on the temperature and concentration. At intermediate temperatures (20-40°C) the micelles can be described as spheres (diameter=17-18nm). For higher temperatures, their form changes towards cylindrical or even wormlike structures. Ordered micellar systems can be obtained for small concentrations, when the micelles are confined to an interface. The proposed experiment aims to study the time-dependent micellization of P123 at different temperatures and surface confinements. Since the ordered micellar system can be manipulated using shear, we want to go even further and destroy the micelles to look at their subsequent rebuilding process. Therefore shear rates of 1000 to 10000 1/s should be applied for a short time followed by kinetic NR measurements after shear cessation to monitor the re-equilibration process.
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SOCHOR Benedikt; GERTH Stefan; GUTFREUND Philipp and SCHUMMER Bernhard. (2020). Time-resolved observation of the formation of amphiphilic surfactantsmicelles using neutron rheo-reflectometry. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1597
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