Maximilian Hartmann

Management of Material Redeposition Below and Above the Sample for Laser Micromachining of Laser Fusion Targets

N. R. Schott, Matthias Brönner, F. Richard Christ, Maximilian Hartmann et autres

Abstract Ultrashort pulse laser micromachining is a commonly used technique in the field of target fabrication for laser fusion experiments. In this context, material redeposition caused by ultrashort pulse laser ablation can greatly reduce the target quality. This work analyzes material redeposition …

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Disorder-to-order transition of long fibers contained in evaporating sessile drops

S. Sannyamath, Roman Vetter, Henning Bonart, Maximilian Hartmann et autres

A liquid drop containing a long fiber is a complex system whose configuration is determined by an interplay of elastic stresses in the fiber and capillary forces due to the liquid. We study the morphological evolution of fibers that are much longer …

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Controlling the electrostatic Faraday instability using superposed electric fields

Sebastian Dehe, Maximilian Hartmann, Aditya Bandopadhyay, Steffen Hardt

We present an experimental study of the electrostatic Faraday instability at the interface between a dielectric and a conducting liquid. We study the response of the interface to an ac electric field, which is superposed by either a second ac field of …

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Concentration gradients in evaporating binary droplets probed by spatially resolved Raman and NMR spectroscopy

Alena K. Bell, Jonas Kind, Maximilian Hartmann, Benjamin Kresse et autres

Understanding the evaporation process of binary sessile droplets is essential for optimizing various technical processes, such as inkjet printing or heat transfer. Liquid mixtures whose evaporation and wetting properties may differ significantly from those of pure liquids are particularly interesting. Concentration gradients …

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The spatial structure of electrostatically forced Faraday waves

Sebastian Dehe, Maximilian Hartmann, Aditya Bandopadhyay, Steffen Hardt

The instability of the interface between a dielectric and a conducting liquid, excited by a spatially homogeneous interface-normal time-periodic electric field, is studied based on experiments and theory. Special attention is paid to the spatial structure of the excited Faraday waves. The …

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Rivulets of finite height

Felix Gerlach, Maximilian Hartmann, Jeanette Hussong, Cameron D. Tropea

In this study two situations in which capillary rivulets rise only to a finite height are examined. The first case is for a vertical corner with an opening angle and contact angle satisfying the Concus–Finn criterion [1], thus resulting normally in an …

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Breakup dynamics of capillary bridges on hydrophobic stripes

Maximilian Hartmann, Mathis Fricke, Lukas Weimar, Dirk Gründing et autres

The breakup dynamics of a capillary bridge on a hydrophobic stripe between two hydrophilic stripes is studied experimentally and numerically using direct numerical simulations. The capillary bridge is formed from an evaporating water droplet wetting three neighboring stripes of a chemically patterned …

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Wetting States of Droplets on Patterned Surfaces and in an Electric Field

Maximilian Hartmann

In nature, wetting of patterned surfaces by droplets is omnipresent. For example, it is used by the Stenocara desert beetle in the Namibian desert to collect moisture from the air. However, it also plays a vital role in engineering applications such as …

Changes of meniscus shapes and capillary rise heights under hypergravity

Beatrice Fickel, Niels Postulka, Maximilian Hartmann, Dirk Gründing et autres

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A geometry-based model for spreading drops applied to drops on a silicon wafer and a swellable polymer brush film

Mathis Fricke, Beatrice Fickel, Maximilian Hartmann, Dirk Gründing et autres

We investigate the dynamics of spreading in a regime where the shape of the drop is close to a spherical cap. The latter simplification is applicable in the late (viscous) stage of spreading for highly viscous drops with a diameter below the …

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The interaction of inner and outer surface corners during spontaneous wetting

Felix Gerlach, Maximilian Hartmann, Cameron D. Tropea

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Stability of Evaporating Droplets on Chemically Patterned Surfaces

Maximilian Hartmann, Steffen Hardt

The stability of water droplets on striped surfaces exposing regions of different wettability is studied experimentally, numerically, and based on a scaling model. Different values of the stripe widths and different contact angle contrasts between the hydrophilic and hydrophobic stripes are considered. …

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