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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Composites and Functional Polymer Hybrids

CPP 13.10: Vortrag

Montag, 27. März 2023, 17:45–18:00, ZEU 255

Gold Nanoparticle/Polymer Brushes Composites: Controlling the Structure via Ion-Specific Effects — •Philipp Ritzert and Regine v. Klitzing — Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstr. 8, 64289 Darmstadt, Germany

Nanocomposite materials based on inorganic gold nanoparticle (AuNP) inclusions inside an organic matrix (e.g. polymer brushes) are employed in various fields: medical technology, catalysis, materials engineering. Combining the properties of both material classes facilitates high versatility of mechanical, optical and chemical properties, while simultaneously covering obvious drawbacks, e.g. stability of one compound. To provide the wide range of applications, nanocomposite materials usually require a specific internal structure. Yet, the understanding of the formation of internal structure and control over formation process is still lacking. Therefore, we aim to provide an approach to manufacture nanocomposite materials with controlled structure. Our model system utilizes various sodium salts (anion: F, Cl, Br, I, SCN) as stimuli for the assembly of citrate-capped gold nanoparticles in a poly-(N-isopropylacrylamide) brush. In a first step, we characterize the effect of sodium salts on pure AuNP suspensions. In a second step, we investigate adsorption parameters of AuNPs from suspension to brush, e.g. adsorption time. The third step involves the structure control of the composite materials with the characterized stimuli. Optical measurements reveal distinct differences between the sodium ions and concentration dependent aging behaviour.