Dresden 2026 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Poster II

CPP 46.7: Poster

Thursday, March 12, 2026, 09:30–11:30, P5

Study of nuclear magnetization transfer between water and ice phases in nanoporous solids — •Cristina Abril Gutierrez Ortigoza and Rustem Valiullin — Felix Bloch Institute for Solid State Physics, University of Leipzig, Leipzig, Germany

NMR Cryoporometry is a promising tool for the characterization of nanoporous solids. The technique relies on introducing a probe liquid into the nanopores, where a liquid and frozen phase can coexist at low temperatures. Both phases can be easily identified using NMR due to their vastly different transverse relaxation rates. The magnetization transfer mechanism between these is not well understood, especially its dependence on various parameters such as temperature and pore size. In this contribution, the magnetization transfer between water and ice in porous silica is explored, the pore structure of which is composed of well-ordered spherical nanopores connected by micropores. The measurements are performed by using the Goldman-Shen pulse sequence, which initializes the experiments in a state where all the magnetization is contained in the liquid phase. By studying how the system re-equilibrates, parameters such as the diffusion coefficient in the ice phase and the proton volume fraction in each phase are obtained. Furthermore, the non-frozen layer thickness, which refers to the liquid-like layer that forms between the ice core and the pore wall, can be obtained by exploiting the well-defined geometries of the ice and water phases. The studies were performed at different temperatures to assess the dependence of the results on this parameter. The experimental data are also compared to theoretical models.

Keywords: nanoporous materials; magnetization transfer; NFL thickness