Berlin 2024 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Gels, Polymer Networks and Elastomers I
CPP 22.5: Vortrag
Mittwoch, 20. März 2024, 10:45–11:00, H 0106
Surfactants as a tool for tuning the volume phase transition temperature VPTT of microgels — •Yulia Gordievskaya1, Joachim Jelken1, Se-Hyeong Jung2, Nino Lomadze1, Andrij Pich2,3, Elena Yu. Kramarenko4, and Svetlana Santer1 — 1University of Potsdam, Potsdam, Germany — 2RWTH Aachen University, Aachen, Germany — 3Aachen Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Geleen, The Netherlands — 4Moscow, Russia
Microgels are well-known to be highly responsive systems able to undergo volume phase transitions under changes in various environmental conditions. Due to this feature, they are used as nanocontainers, sensors, micropumps, and actuators in microfluidic systems. We showed the light-driven remote control of the volume phase transition temperature VPTT of p(NIPAM-AAc) microgels between 32°C and up to 95°C in the solution of azobenzene containing surfactants[1,2]. To discuss the mechanism of light-triggered VPTT shift we provided the theoretical calculations covering a wide range of surfactant concentrations and solvent quality. The factors determining the VPTT are electrostatic and hydrophobic interactions in the system and the translational entropy of counterions.
[1] Jelken, J., Jung, S. H., Lomadze, N., Gordievskaya, Y. D., Kramarenko, E. Y., Pich, A., & Santer, S. Adv. Funct. Mater., 2022, 32(2), 2107946. [2]. Schimka S., Gordievskaya Y.D., Lomadze N., Lehmann M., von Klitzing R., Rumyantsev A.M., Kramarenko E.Y., Santer, S. J. Chem. Phys., 2017, 147(3), 031101
Keywords: PNIPAM microgels; theory; azobenzene-containing surfactants; transition temperature