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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Gels, Polymers Networks and Elastomers II

CPP 6.2: Vortrag

Montag, 17. März 2025, 15:15–15:30, H34

Responsive Microgel Based Membranes — •Thomas Hellweg — Universität Bielefeld, Fak. f. Chemie, Physikalische und Biophysikalische Chemie, Universitätsstr. 25, 33615 Bielefeld

If microgels are made with comonomers which can act as (photo-)crosslinkable secondary crosslinker, they can be deposited in thin layers and subsequently be cross- linked by irradiation [1,2]. Upon cross-linking freestanding membranes are obtained, which still exhibit the temperature response of the original microgels. The present contribution describes the synthesis and properties of the respective microgels, the membrane formation, and the membrane properties. The thermal response of the obtained 2D materials can be exploited to make gating membranes [3] which modulate ion flow by changing temperature which can be used in electrochemical devices. The resistance is found to steeply increase by up to an order of magnitude at the volume transition of the original microgels. Hence, these freestanding microgel membranes might be useful for building self- regulating fuel cells. Moreover, they can be doped with metal nanoparticles granting them catalytic activity and allowing to use them in flow reactors or microfluidic cells for chemical conversion [4].
[1] M. Dirksen, et al., Langmuir 2022, 38, 638-651.
[2] M. Dirksen, et al., RSC Adv., 2021, 11, 22014.
[3] S. Uredat, et al. , Phys. Chem. Chem. Phys. 2024, 26, 2732-2744
[4] V. Sabadasch, et al., ACS Applied Materials & Interfaces , 2022, 14, 43, 49181.

Keywords: microgels; gating membranes; ion flow