Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Polyelectrolytes

CPP 17.7: Vortrag

Dienstag, 8. März 2016, 11:30–11:45, H40

Uptake and Spatial Distribution of Thiol-Capped Gold Nanoparticles in Strong Polyelectrolyte Brushes — •Dikran Kesal, Stephanie Christau, Patrick Krause, Tim Möller, and Regine von Klitzing — TU-Berlin, Straße des 17.Juni 124, 10623 Berlin, Germany

Polymer brushes are suitable candidates for the design of responsive smart surfaces which can be prepared by end-grafting polymers with the desired chain functionality on solid substrates. These surfaces have the ability to respond to external stimuli by changing their chemical or physical properties and can be used as a matrix for the immobilization of gold nanoparticles (AuNPs), which induce optical properties due to their surface plasmon resonance. In order to use the Brush/AuNP hybrids as smart surfaces, we must be able to control the arrangement of the NPs inside the brush and to correlate it with the optical properties of the composite system.

The present study addresses the distribution and uptake of charge switchable AuNPs inside poly-[2-(Methacryloyloxy) ethyl] trimethylammonium chloride (PMETAC) which yields a strong positively charged polyelectrolyte brush. The 5 nm AuNPs are capped with mercaptopropionic acid and are either negatively or uncharged depending on the pH. While some recent efforts have been made in terms of particle uptake and distribution in neutral (PNIPAM) and weakly charged (PDMAEMA) polymers by changing the thickness of the brushes and particle size, here the focus is on understanding how charges affect particle loading and penetration into the brush.