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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster II

CPP 46.8: Poster

Donnerstag, 12. März 2026, 09:30–11:30, P5

Advanced analysis of NMR cryoporometry data — •Crina Rahause, Georgiy Baroncha, and Rustem Valiullin — Felix Bloch Institute for Solid State Physics, Leipzig University, Leipzig, Germany

NMR cryoporometry is a powerful tool for structural characterisation of multi-scale nanoporous materials. It relies on probing the pore size dependent ice-liquid phase transitions of nanoconfined liquid. However, accurate interpretation of the experimental data requires a better description of phase equilibria, as well as a framework that takes into account the network topology and relaxation effects. In this contribution, we perform NMR measurement using water and octamethylcyclotetrasiloxane (OMCTS) as probe liquids inside highly ordered nanoporous alumina membranes with well-defined pore sizes ranging from 25 to 180 nanometres. OMCTS differs from water in terms of relaxation times and the thermodynamic parameters controlling phase transition suppressions; therefore, by comparing the responses of the two liquids in different porous media, we can identify key parameters which are necessary for accurately establishing an advanced cryoporometry methodology, and demonstrating the applicability of this technique to a wide range of materials.

Keywords: Pore size distribution; Network models; NMR cryoporometry