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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster II
CPP 46.2: Poster
Donnerstag, 12. März 2026, 09:30–11:30, P5
Phase transition in water-glycerol solutions — •Klara Holl1,2, Louisa Kraft1,2, and Katrin Amann-Winkel1,2 — 1Institut für Physik, Johannes Gutenberg-Universität, Mainz — 2Max-Planck-Institut für Polymerforschung, Mainz
Water is omnipresent in our daily lives with many anomalous properties and a unique phase diagram. Studies of supercooled water provides insight into the hypothesis of the coexistence of two liquid states of water and a liquid-liquid transition. This proposes two different types of supercooled liquid water in a high-density and low-density liquid state, that are separated by a first order phase transition at low temperatures and elevated pressure. But how does this hypothesis impact on aqueous solutions?
Water-glycerol mixtures are often used in pharmaceuticals and act as cryoprotectants, common in biomedicine as well as automotive antifreeze. While pure water crystallizes easily, the glass-forming agent glycerol can serve as soft confinement for water. Changing the concentration of the two components alters the liquid's physical and thermodynamic properties, including depression of the crystallisation temperature.
We investigate different water-glycerol solutions at low-temperatures and high-pressure conditions using a diamond anvil cell. This allows in situ optical observation of crystallisation and glass transition. Structural changes are studied by X-ray diffraction and differential scanning calorimetry.
Keywords: Water; Glycerol