Regensburg 2019 – wissenschaftliches Programm
CPP 25.16: Poster
Dienstag, 2. April 2019, 14:00–16:00, Poster B1
Magnetic Nanoparticle / Polymer Brush Composites: The Effect of pH and Concentration on Particle Adsorption — •Philipp Ritzert, Dikran Boyaciyan, and Regine v Klitzing — Soft Matter at Interfaces, Institut für Festkörperphysik, TU Darmstadt
Polymer chains, which are end-grafted chemically to a substrate are referred as polymer brushes and have attracted a growing interest in the field of surface coating over the last few decades due to their high mechanical and chemical stability. Based on the functional group of the monomer unit, it may exhibit sensitivity to external stimuli, such as temperature, pH or solvent (1). Polymer brushes can bind different kinds of material with a high selectivity, depending on the available functional groups. Recent studies demonstrated the incorporation of nanoparticles into different kinds of polymer brushes (1; 2; 3). In the case of gold nanoparticles (AuNPs), the uptake induced novel optical properties, due to the Surface Plasmon Resonance of the AuNPs (3).
The present work demonstrated the successful immobilization of magnetic nanoparticles (MNPs) on Poly(N-isopropylacrylamide) (PNIPAM) brushes. The pH-sensitive citrate capping of the MNPs stabilizes the MNPs in the neutral to basic pH regime and simultaneously binds to the PNIPAM brush via H-bonding. The goal of this work is to characterize the adsorption of MNP on PNIPAM brushes by changing the pH value and concentration of the MNP suspension.
1. S. Christau, et al. Macromolecules. 2017, 50, pp. 7333-7343.
2. D. Boyaciyan, et al. SoftMatter. 2018, 14, pp. 4029-4039.
3. S. Christau, et al. Polymers. 2014, 6, pp. 1877-1896.