SKM 2021 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 6: Poster Session II

CPP 6.3: Poster

Dienstag, 28. September 2021, 17:30–19:30, P

Aggregation of Gold Nanoparticles: Effects of Ion Type, Salt Concentration, and Aging — •Philipp Ritzert and Regine v. Klitzing — TU Darmstadt, Institute for Condensed Matter Physics, Soft Matter at Interfaces, Hochschulstr. 8, 64283, Darmstadt

The combination of inorganic nanoparticles (NPs) with (responsive) organic polymer matrices advances numerous scientific and technical applications, e.g. catalysis, nanoactuation, and medical engineering. Despite considerable progress of embedding NPs into a matrix, the process is often not well-controlled and the composite manufacturing relies on trial-and-error to augment the product quality. Better control over the product manufacturing (i.e. NP incorporation) enhances the applicability through more complex NP assemblies.

The project aims at the control of gold NP structuring in a polymer brush matrix. Gold NPs present a versatile model system as they are easily synthesized and stabilized. Furthermore, they exhibit a strong localized surface plasmon resonance in the visible range. Addition of salt triggers the re-ordering, thus, providing multiple adjusting parameters: salt concentration, ion type, and exposure time.

Preceeding composite manufacturing, characterizing the response of gold NPs is essential. The present contribution studies the time evolution of the optical absorption spectra of citrate-capped gold NP suspensions (diameter approx. 13 nm) containing different concentrations of various monovalent sodium salts along the Hofmeister series. In addition, the project exemplifies the influence of basic gold NP properties, namely size and capping molecule.