SKM 2023 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 54: Complex Fluids and Colloids, Micelles and Vesicles (joint session CPP/DY)

DY 54.10: Vortrag

Freitag, 31. März 2023, 12:15–12:30, MER 02

Bicontinuous Microemulsion in Porous Materials — •Margarethe Dahl¹, René Haverkamp², Larissa Doll¹, Thomas Hellweg², and Stefan Wellert¹ — ¹Institut für Chemie, Technische Universität Berlin, Germany — ²Physikalische und Biophysikalische Chemie, Universität Bielefeld, Germany

While the bulk phase behavior of microemulsions has been intensively studied, the influence of a geometrical confinement has been widely neglected. Understanding the influence of geometrical restrictions yields both, fundamental insights and importance for applications, e.g. decontamination and enhanced oil recovery. In our study, controlled-pore silica glasses (CPGs) serve as confining matrices for bicontinuous microemulsions. Effects of the pore network and surface chemistry on phase behavior and structure of a model microemulsion are studied by using various CPGs with pore diameter between 75 – 1000 Å and ternary bicontinuous microemulsions (water/octane/C10E4). The naturally hydrophilic surfaces of the CPGs were hydrophobically modified to analyze the influence of the surface polarity. We use imaging techniques (cryo-SEM), small angle scattering (SANS, SAXS) with measurements of the advancing contact angles inside the hydrophilic and hydrophobically modified pores (Washburn approach) to explore the microemulsion phase structure in bulk and inside the pores. In this talk, the results of these combined experiments will be presented and discussed.