Regensburg 2025 – scientific programme

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BP: Fachverband Biologische Physik

BP 12: Biomaterials, Biopolymers and Bioinspired Functional Materials III (joint session CPP/BP)

BP 12.2: Talk

Tuesday, March 18, 2025, 10:00–10:15, H46

In situ GISAXS investigation of different protein-templated titania nanostructures — •Linus Fidelis Huber and Peter Müller-Buschbaum — TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany

Nanostructured titania thin films have been studied for a large variety of applications. An environmentally benign and scalable synthesis route for this material class could be of interest to many state-of-the-art devices, from solar cells to battery materials. Protein-assisted sol-gel synthesis is a low-temperature, low-cost, and highly scalable technique, that can be used to achieve a nanostructured titania thin film. It has been shown that the bovine whey protein β-Lg forms differently shaped aggregates at different solution pH values. With simple changes to the solution chemistry, different domain sizes, porosities, and morphologies are possible. Therefore, it is a promising candidate to create tunable and mesoporous titania structures. In this work, we investigate the film formation with in situ small-angle/wide-angle grazing incidence X-ray scattering (GISAXS/GIWAXS) techniques. It is found that films printed at acidic pH form significantly different final bulk morphologies than films printed at neutral pH. The crystallite phase is strongly reduced in average domain size and domain-domain distance. Agglomerate size is increased for the acidic template. The in situ data is complemented by SEM, PL, UV-Vis and static GISAXS/GIWAXS measurements.

Keywords: Titania; GISAXS; Nanostructures; Printing; Thermoelectric