Dresden 2026 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: French-German Session: Nanomaterials, Composites and Hybrids II

CPP 42.1: Invited Talk

Wednesday, March 11, 2026, 17:00–17:30, ZEU/0260

Mesopores filled with (poly)ionic liquids: phase transitions under confinement, and structure seen by SAXS and SANS — •Julian Oberdisse and Anne-Caroline Genix — Laboratoire Charles Coulomb, U Montpellier France

Understanding the molecular structure of mesoporous solid ionic systems is crucial for optimizing macroscopic properties, in particular ionic transport for energy applications, as well as mechanical flexibility. These systems can be synthesized efficiently under "one-pot" conditions, which rely on mesopore formation through microphase separation of templating ionic liquids.

In the present study, the phase transitions of the embedded ionic liquid have been studied by wide-angle scattering, QENS, DSC, and BDS, as a function of confinement. Then, poly(ionic liquid)s have been added in order to incorporate both connectivity and modify mechanical strength. We report on the structural analysis of ionic liquid and poly(ionic liquid) embedded in ionosilica matrices, employing a combination of small-angle scattering of neutrons and X-rays, isotopic substitution, and physico-chemical solvent-based extraction methods. Data analysis is based on molecular modelling with an original, quantitative comparison of the scattering curves under different contrasts. In agreement with NMR, it is shown that these mesoporous systems have an unexpected molecular structure, with the ionic liquid counterions penetrating the ionosilica matrix surrounding the mesopores. The poly(ionic liquid) forms patches decorating the pore walls, with tunable conformation sensitive to solvent conditions.

Keywords: WAXS; BDS; DSC; scattering