Regensburg 2022 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Crystallization, Nucleation and Self-Assembly

CPP 41.8: Talk

Thursday, September 8, 2022, 17:15–17:30, H39

Ligand-stabilized gold nanorods as an ideal model system for anisotropic colloids — •Marcel Krüsmann and Matthias Karg — Physikalische Chemie I: Kolloide und Nanooptik, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, 40225, Germany

Anisotropic colloidal particles have interesting optical, electronic and self-assembly properties. Yet the investigation of their phase behavior is often difficult due to limitations in quantity, monodispersity and colloidal stability for many particles. An additional challenge is the precise determination of particle number concentrations.

The easily scalable synthesis of gold nanorods gives access to monodisperse anisotropic colloids with a broad range of aspect ratios. The functionalization of gold nanorods with a polymer ligand increases the colloidal stability and removes the large excess of surfactant that is most often used in particle synthesis.

These anisotropic particles can now be studied with various methods. One of this methods is small-angle X-ray scattering for which gold has an excellent contrast. In combination with the good colloidal stability it is now possible to not only study the form factor but also the structure factor at high concentrations and/or during induced aggregation. The addition of absolute intensity measurements gives access to the particle number concentration, that can be related to measured extinction from spectroscopy.