Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 35: P7: Hydrogels and Elastomers

CPP 35.4: Poster

Tuesday, March 17, 2015, 14:00–16:00, Poster C

Light induced phase transitions in gold-microgel hybrids — •Maren Lehmann, Sarah Turner, Lucas Kuhrts, and Regine von Klitzing — Stranki-Laboratory, Dept. of Chemistry, TU Berlin, Germany

Poly(N-isopropylacrylamide) (PNIPAM) microgels are one of the most studied soft materials. They respond to various external stimuli, which makes them attractive for biological applications, such as drug delivery and biosensing, as well as for catalysis or nanoreactors [1] [2]. Depending on their composition PNIPAM microgels respond to pH, ionic strength or solvent. By introducing metal nanoparticles they are able to react to a magnetic field or light. We incorporated gold nanoparticle into the microgel network in order to introduce a responsiveness to light of the plasmon resonance wavelength of the gold nanoparticles. The temperature dependent size of the microgel and the hybrids was measured by dynamic light scattering (DLS). The swelling and shrinking properties were investigated by DLS and temperature-controlled UV-Vis adsorption spectroscopy. The uptake of gold nanoparticles per microgel particle and their distribution within the microgel particles were studied with the transmission electron microscope.

[1] K. Gawlitza et al. Phys.Chem.Chem.Phys.15, 37 (2013). [2] M. Karg et al. Curr. Opin. Colloid Interface Sci 14, 6 (2009)