Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: POSTER: Colloids and Nanoparticles
CPP 9.20: Poster
Monday, March 26, 2007, 16:00–18:00, Poster B
New well-defined Hybrid Materials with Thermoresponsive PNIPAM-Shells and Inorganic Nanoparticle-Cores — •Matthias Karg1, Isabel Pastoriza-Santos2, Luis Liz-Marzán2, and Thomas Hellweg1 — 1TU Berlin, Stranski-Lab., Germany — 2Universidade de Vigo, Grupo de Quimica Fisica, Vigo, Spain
A simple, emulsion polymerization of N-isopropylacrylamide with the crosslinker N,N’-methylenebisacrylamide leads to spherical hydrogels. Such particles are usually in the submicron size range and are therefore called microgels. Since PNIPAM microgels are thermoresponsive they can be classified as smart materials and have been the topic of several investigations. As these microgels react much faster on external stimuli such as temperature, pH and ionic strength than their macroscopic counterparts they are interesting for different applications including sensors, drug delivery and separation media. Nevertheless the optical properties of organic polymers are poor because of their rather low refractive index. Composite materials made of microgels and inorganic nanoparticles combine the temperature-dependend swelling-behavior of the microgel and the high refractive index of the nanoparticles. We present here the preparation of different types of hybrid systems made of PNIPAM and silica and silica-coated gold nanoparticles. Characterization has been done using dynamic light scattering (DLS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), atomic force microscopy (AFM) as well as UV-VIS-spectroscopy. The results show that well-defined core-shell systems with just one nanoparticle-core can be synthesized.