Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: Poster: Elastomers and Gels
CPP 34.11: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Structural investigations of p-NIPAM microgels by incorporation of gold nanoparticles — •Kornelia Gawlitza1, Matthias Karg2, Adrian Carl1, Paul Mulvaney2, and Regine von Klitzing1 — 1Stranski-Laboratorium, Institut für Chemie, Technische Universität Berlin — 2School of Chemistry & Bio21 Institute, University of Melbourne
Due to the reversible volume phase transition at around 32°C, poly-N-isopropylacrylamide (p-NIPAM) is interesting for applications like drug delivery and biocatalysis.[1] Due to the characteristic plasmon resonance of gold nanoparticles (NP) which is a function of the particle size and shape, another field of high research interest is owned by these metal NPs. One approach to receive information about the mesh size of p-NIPAM microgels is to incorporate metal NPs into the polymer network.[2] In our studies, we synthesized citrate stabilized spherical gold NPs with different diameters and different p-NIPAM microgels. Afterwards, we incorporated these NPs into the polymer by physical entrapment. Using transmission electron microscopy (TEM), we were able to observe different structures inside of the polymer network by changing the amount of crosslinker from 5% to 0.25%. Therefore, a model from previous studies was applied to get information of a 3D object from a 2D TEM image. The characterization of the synthesized gold NPs was done by TEM while the size of the p-NIPAM microgel particles was determined by Dynamic Light Scattering (DLS). [1] K. Kratz, T. Hellweg, W. Eimer, Polymer (2001), 42, 6531 [2] Kuang, M.; Wang, D.; Möhwald, H. Adv Funct Mater 2005, 15, 1611