Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster II
CPP 46.1: Poster
Donnerstag, 12. März 2026, 09:30–11:30, P5
Pressure-induced amorphization of aqueous PEG solutions — •Leah Dorothea Schwerdtfeger1,2, Isabell Zick1,2, and Katrin Amann-Winkel1,2 — 1Institut für Physik, Johannes Gutenberg Universität, Mainz — 2Max-Planck-Institut für Polymerforschung, Mainz
Water is a fundamental substance whose behavior under supercooled temperatures shows many anomalous properties. Among the many curiosities, water can even form different amorphous states. These amorphous states are hypothesized to be directly related to two different liquid states of water, namely high- and low-density liquid. Understanding the pressure-induced amorphization of aqueous solutions can reveal how solutes alter water's phase diagram and give further insight to the predicted liquid-liquid transition.
While the impact of small molecules is known from previous studies, the role of larger polymers remains unexplored. Here, we discuss experiments on aqueous polyethylene glycol (PEG) solutions with different molar weights, studying their effect on the pressure-induced phase transitions. Our dilatometric measurements show how solutes broaden the transition from hexagonal ice to high-density amorphous ice (HDA), depending on the molar fraction. We also investigate the polyamorphic transition between low- and high-density amorphous ice (LDA-HDA), which for pure water is known to exhibit a strong temperature-dependence. The samples are further characterized by X-Ray diffraction (XRD).
Keywords: Amorphous ice; High pressure; Polyethylen glycol; Phase transition