Berlin 2018 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Focus: Smart Hydrogels and Hydrogel Based Devices I - organized by Gerald Gerlach, Walter Richtering and Thomas Hellweg

CPP 21.5: Talk

Tuesday, March 13, 2018, 10:45–11:00, C 130

Doping thermosensitive PNIPAM microgels with magnetic nanoparticles — •Marcus. U. Witt¹, Stephan Hinrichs², Melissa Hermes³, Birgit Fischer², Annette Schmidt³, and Regine v. Klitzing¹ — ¹Technische Universität Darmstadt, Institut für Festkörperphysik, Alarich-Weiss-Straße 10, 64287 Darmstadt — ²Universität Hamburg, Institut für Physikalische Chemie, Grindelallee 117, 20146 Hamburg — ³Universität zu Köln, Institut für Physikalische Chemie, Luxemburger Straße 116, 50939 Köln

Poly-N-isopropyl acrylamide (PNIPAM) based microgels are of high interest as model systems for thermo-responsive gel structures that exhibit a volume phase tran-sition temperature. First results with the loading of the microgels with magnetic nanoparticles (MNP) showed a small re-sponse of the particle volume to an external magnetic field under geometrical confine-ment [1]. Theoretical calculations predict a much bigger response. To investigate now the origin of this difference in response the MNP distribution inside the microgel is of interest.

Therefore gels of different internal polymer structure are synthesized: heterogeneously cross linked microgels (batch) and homo-geneously cross linked microgels (feeding) [2]. The MNP distribution is different in the two cases and is of interest for further investigations of the magnetic response for magnetic microgels particles.

References

[1] S. Backes, M. U. Witt, R. v. Klitzing, J. Phys. Chem. B 2015, 119, 12129-12137 [2] R. Acciaro, Langmuir, 2011, 27, 7917-7925