Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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 21.4: Vortrag

Dienstag, 13. März 2018, 10:30–10:45, C 130

Smart core-shell microgel/silver nanoparticle hybrids as switchable catalysts — •Timo Brändel, Yvonne Hertle, and Thomas Hellweg — Physical and Biophysical Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld

Hybrid materials combining the interesting properties of nanoparticles with stimuli responsive microgels have obtained considerable attention during the last decade. Our contribution focuses on core-shell microgels based on the monomers, N-isopropylacrylamide (NIPAM) N-isopropylmethacrylamide (NIPMAM) as core materials and N-n-propylacrylamide (NNPAM) as shell material. These microgels exhibit a very interesting linear phase transition region between the two volume phase transition temperatures (VPTTs) of the respective homopolymer microgels.

The particle architecture of the core-shell microgels is modified by copolymerization with acrylic acid (AAc) and by a variation of the cross-linker density of the core. These modifications in the core region of the core-shell microgels are important steps to tailor the microgel properties towards an excellent ability to stabilize nanoparticles.

Silver nanoparticles are generated in situ inside the core-shell microgel templates and their temperature dependent catalytic activity is studied by following the degradation of p-nitrophenole. The results display, that the use of the core-shell microgels is a versatile approach towards catalytic particles with a switchable catalytic activity.