Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Focus: Smart Hydrogels and Hydrogel Based Devices II - organized by Gerald Gerlach, Walter Richtering and Thomas Hellweg
CPP 37.8: Vortrag
Mittwoch, 14. März 2018, 12:00–12:15, C 130
Hydrogels for Microsensors - Mechanical Properties and Swelling Forces of Microgel Particles — •Maximilian Seuss1, Willi Schmolke2, Sebastian Seiffert2, Astrid Drechsler1, Ivan Raguzin1, Julian Thiele1, and Andreas Fery1 — 1Leibniz Institut für Polymerforschung Dresden e.V., Dresden, Germany — 2Institute of Physical Chemistry, Johannes Gutenberg-Universität, Mainz, Germany
Hydrogels have drawn the focus of engineers to be applied in microsensors since many hydrogels exhibit a volume phase transition reacting to an external stimulus, e.g. changes in the pH, temperature or concentration of specific molecules. Here we present an approach for core-shell microgel particles which are responsive to temperature while the surface adhesion stays unaltered. This is achieved by encapsulating a pre-prepared poly(N-isopropylacrylamide) (pNiPAAm) microgel particle with a poly(acrylamide) shell in a microfluidic reactor. Combining optical microscopy and colloidal probe AFM measurements we demonstrate that the responsiveness as well as the accompanied changes in mechanical properties can be detected on the per-se unresponsive shell.[1] Furthermore, the colloidal probe technique is applied to directly measure the exerted swelling force of single confined model pNiPAAm hydrogel particle. Combining the network architecture with the changes in volume, mechanical compliance and resulting swelling forces may provide important parameters for novel sensor designs.
[1] M. Seuss, W. Schmolke, A. Drechsler, A. Fery, S. Seiffert, ASC Appl. Mater. Interfaces, 2016, 8, 16317