Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.55: Poster

Thursday, April 3, 2014, 15:00–19:00, P2

Hybrid particle of gold nanoparticles embedded in thermoresponsive microgels — •Maren Lehmann, Sarah T. Turner, Lucas Kurths, and Regine von Klitzing — Stranki-Laboratory, Dept. of Chemistry, TU Berlin, Germany

For applications such as sensory and drug delivery systems, microgels with the ability to reversibly switch between a collapsed and expanded state in response to an external stimulus (pH, temperature), are attractive. Embedding metal nanoparticles into microgels can introduce new functionalities and enlarge the field of application to catalysis, medicine and nanoreactors [1] [2] [3]. There are different approaches to prepare hybrids of gold nanoparticles and microgels. Lu et al. demonstrated an in situ synthesis of Au-Pt nanorods in core-shell microgel particles by growing rods from gold seeds previously immobilized in the microgel network [4]. We embed gold nanospheres into PNIPAM microgel networks via various mixing routes in order to reach evenly loaded microgel particles. The differently prepared hybrid particles were compared regarding their zeta potential and volume phase transition depending on the temperature. Transmission electron microscopy images were used to evaluate the distribution and loading. The microgel particles were synthesized in a semi-batch method and with positively and negatively charged initiator molecules.

[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). [3] H. Lange et al. Langmuir 28 (2012). [4] Y. Lu et al. ACS Nano 4, 12 (2012)