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O: Fachverband Oberflächenphysik

O 107: Nanostructured Surfaces and Thin Films

O 107.1: Talk

Friday, March 22, 2024, 10:30–10:45, MA 042

Morphology of nanostructured surfaces — •Jens Uwe Neurohr¹, Michael Klatt², and Karin Jacobs¹ — ¹Experimental Physics and Center for Biophysics, Saarland University, Saarbrücken, Germany — ²Institut für KI Sicherheit, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Wilhelm-Runge-Straße 10, 89081 Ulm, Germany

Nanorough surfaces are often classified by the root mean square (RMS) roughness. However, a single scalar value can capture only limited geometric information about the complex structured surface. Indeed, there are different families of nanorough surfaces that are clearly distinguished by their geometric features, but they can have the same RMS values. As an important consequence, the RMS fails to predict the adhesive behavior of bacteria on nano-structured surfaces (in fact, even within one family) [1]. A solution to this problem is offered by the so-called Minkowski functionals that provide a complete characterization of additive shape informationas rigorously proven in integral geometry [4]. These comprehensive shape descriptors have been successfully applied to a broad range of applications [1,2,3]. Here, we will use the Minkowski functionals to distinguish families of nanorough surfaces. This presentation will, moreover, show how they can predict the adhesive behavior of Staphylococcus aureus on Black Si.

[1] Spengler et al., Nanoscale 11:19713 (2019); [2] Schröder-Turk et al., Adv. Mater. 23, 2535 (2011); [3] Wagner, Physik Journal 14, 41 (2016); [4] Schneider and Weil, Stochastic and integral geometry (2008), Vol. 1 Springer

Keywords: Minkowski functionals; Atomic force microscopy; Adhesion; Single-cell force microscopy