Dresden 2026 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Focus Session: Water – from Atmosphere to Space II (joint session CPP/DY)
DY 24.6: Talk
Tuesday, March 10, 2026, 12:30–12:45, ZEU/LICH
Mesoscopic Structures in Water/HFIP based Electrolytes — •Sophie Zeilinger1,2 and Markus Mezger1 — 1Center for Nano Structure Research, Faculty of Physics, University of Vienna, AT-1090 Vienna — 2Institute of Physical Chemistry, Faculty of Chemistry, University of Vienna, AT-1090 Vienna
Previous studies have shown that binary water/hexafluoroisopropanol (HFIP) mixtures exhibit nanoscale heterogeneties that strongly affect properties such as reaction rates. The complex hydrogen bonding network of the binary mixture together with the amphiphilic character of the HFIP molecule provides a sensitive environment in which subtle changes in interactions can generate nanoscale heterogeneties. Here, we study the structure formation in water/HFIP under the influence of hydrophilic and hydrophobic ions by Small Angle X-Ray Scattering (SAXS). Depending on water content, pH, salt concentration and temperature we observe monotonous and oscillatory density correlations with structural parameter on the nanometer length scale. These structures are explained by the coupling of coulombic interactions between charged hydrophilic and hydrophobic ions vs. local fluctuations in water/HFIP concentrations.
Keywords: water; hexafluoroisopropanol HFIP; small angle x-ray scattering SAXS; antagonistic salts; density correlation functions