Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Hydrogels and Microgels
CPP 8.8: Vortrag
Montag, 7. März 2016, 17:15–17:30, H40
CP-AFM Study on elastically switchable core-shell microgel particles with constant adhesion properties — •Maximilian Seuss1, Willi Schmolke2, Sebastian Seiffert2, and Andreas Fery1 — 1Leibniz Institute of Polymer Research Dresden, Dresden, Germany — 2Institute of Chemistry and Biochemistry, FU Berlin, Berlin, Germany
We present a novel class of thermo-responsive core-shell microgel particles. They allow to change their mechanical properties while their adhesive properties remain unaffected. The switching is introduced by a thermo-responsive hydrogel core exhibiting a volume phase transition, e.g. poly(N-isopropylacrylamide). Exceeding its lower critical solution temperature, the microgel deswells, densifies, and therefore becomes stiffer. Usually, this process is accompanied by a change in surface chemistry since the microgel switches from hydrophilic to hydrophobic.[1] These effects can be decoupled from each other by encapsulating the microgel in a thermally non-responsive polyacrylamide shell in a droplet-based microfluidics approach.[2] Using colloidal probe AFM, we validated the constant adhesion properties of such core-shell particles between 28 and 40 °C. Further, we have proven that the elastic changes of the core material are preserved attenuatedly in the corresponding core-shell microgel particles.
[1] S. Schmidt, Adv. Funct. Mater. 2010, 20, 3235
[2] S. Seiffert, J. Am. Chem. Soc. 2010, 132, 168