Dresden 2026 – scientific programme

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BP: Fachverband Biologische Physik

BP 7: Poster Session I

BP 7.11: Poster

Monday, March 9, 2026, 15:00–17:00, P5

Atomic-Scale Probing of Aluminum Distribution in Catalysts and Peptide COM Fidelity — •Sakshi Sinha — Department of Materials Physics, Institute of Material Science, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart

Atom Probe Tomography (APT) enables three-dimensional, atomic-scale mapping of inorganic and biomolecular materials. Using conventional lift-out specimen preparation, we study aluminum distribution in microporous aluminosilicate catalysts with varying Al content. The frequency distribution with considering different sphere sizes N in order to investigate size-dependent effects for segregating or clustering behavior of the Al atoms. APT reveals atomic-scale clustering and uniformity of Al, providing direct insight into acid site density and strength, and complements bulk techniques such as ICP-OES by resolving localized compositional variations. For biomaterials, cryogenic quench-freezing is used to prepare aqueous specimens. Mass spectra indicate that fragmentation behavior is concentration-dependent and influenced by hydration shell disruption during field evaporation. Experimental interfragment distances closely match theoretical center-of-mass distances within 1 Å, demonstrating that APT can preserve biomolecular subunit spatial relationships with sub-angstrom fidelity. These studies demonstrate the versatility of APT in probing both inorganic and biomolecular systems with unprecedented atomic precision, opening pathways for understanding structure*function relationships across material classes.

Keywords: Atom Probe Tomography; Peptide; Catalyst; Local composition frequency distribution; molecular structure