122 citations · 647 across the 19 of their papers we have counts for
19 papers
Metabolic activity controls the emergence of coherent flows in microbial suspensions
Alexandros A. Fragkopoulos, Florian Böhme, Nicole Drewes +1
Photosynthetic microbes have evolved and successfully adapted to the ever-changing environmental conditions in complex microhabitats throughout almost all ecosystems on Earth. In t…
Light-regulated adsorption and desorption of Chlamydomonas cells at surfaces
Rodrigo E. Catalan, Alexandros A. Fragkopoulos, Nicolas von Trott +4
Microbial colonization of surfaces represents the first step towards biofilm formation, which is a recurring phenomenon in nature with beneficial and detrimental implications in te…
Quantifying gliding forces of filamentous cyanobacteria by self-buckling
Maximilian Kurjahn, Antaran Deka, Antoine Girot +5
Filamentous cyanobacteria are one of the oldest and today still most abundant lifeforms on earth, with manifold implications in ecology and economics. Their flexible filaments, oft…
Motility and self-organization of gliding Chlamydomonas populations
Sebastian Till, Florian Ebmeier, Alexandros A. Fragkopoulos +2
Cellular appendages such as cilia and flagella represent universal tools enabling cells and microbes, among other essential functionalities, to propel themselves in diverse environ…
Emergent probability fluxes in confined microbial navigation
Jan Cammann, Fabian Jan Schwarzendahl, Tanya Ostapenko +3
When the motion of a motile cell is observed closely, it appears erratic, and yet the combination of nonequilibrium forces and surfaces can produce striking examples of organizatio…
Light controls motility and phase separation of photosynthetic microbes
Alexandros A. Fragkopoulos, Jérémy Vachier, Johannes Frey +4
Large ensembles of interacting, out-of-equilibrium agents are a paradigm of active matter. Their constituents' intrinsic activity may entail the spontaneous separation into localiz…
Adsorption-Induced Slip Inhibition for Polymer Melts on Ideal Substrates
Mark Ilton, Thomas Salez, Paul D. Fowler +7
Hydrodynamic slip of a liquid at a solid surface represents a fundamental phenomenon in fluid dynamics that governs liquid transport at small scales. For polymeric liquids, de Genn…
Elastocapillary Levelling of Thin Viscous Films on Soft Substrates
Marco Rivetti, Vincent Bertin, Thomas Salez +6
A thin liquid film with non-zero curvature at its free surface spontaneously flows to reach a flat configuration, a process driven by Laplace pressure gradients and resisted by the…
Curvature-guided motility of microalgae in geometric confinement
Tanya Ostapenko, Fabian Jan Schwarzendahl, Thomas Böddeker +4
Microorganisms, such as bacteria and microalgae, often live in habitats consisting of a liquid phase and a plethora of interfaces. The precise ways in which these motile microbes b…
Solid Capillarity: When and How does Surface Tension Deform Soft Solids?
Bruno Andreotti, Oliver Baeumchen, Francois Boulogne +6
Soft solids differ from stiff solids in an important way: their surface stresses can drive large deformations. Based on a topical workshop held in the Lorentz Center in Leiden, thi…
Universal contact-line dynamics at the nanoscale
Marco Rivetti, Thomas Salez, Michael Benzaquen +2
The relaxation dynamics of the contact angle between a viscous liquid and a smooth substrate is studied at the nanoscale. Through atomic force microscopy measurements of polystyren…
Influence of Slip on the Plateau-Rayleigh Instability on a Fibre
Sabrina Haefner, Michael Benzaquen, Oliver Baümchen +6
The Plateau-Rayleigh instability of a liquid column underlies a variety of fascinating phenomena that can be observed in everyday life. In contrast to the case of a free liquid cyl…
Relaxation and Intermediate Asymptotics of a Rectangular Trench in a Viscous Film
Oliver Bäumchen, Michael Benzaquen, Thomas Salez +5
The surface of a thin liquid film with nonconstant curvature flattens as a result of capillary forces. While this leveling is driven by local curvature gradients, the global bounda…
Capillary-driven flow induced by a stepped perturbation atop a viscous film
Thomas Salez, Joshua D. McGraw, Oliver Bäumchen +2
Thin viscous liquid films driven by capillarity are well described in the lubrication theory through the thin film equation. In this article, we present an analytical solution of t…
Numerical solutions of thin film equations for polymer flows
Thomas Salez, Joshua D. McGraw, Sara L. Cormier +3
We report on the numerical implementation of thin film equations that describe the capillary-driven evolution of viscous films, in two-dimensional configurations. After recalling t…
Self-Similarity and Energy Dissipation in Stepped Polymer Films
Joshua D. McGraw, Thomas Salez, Oliver Bäumchen +2
The surface of a thin liquid film with nonconstant curvature is unstable, as the Laplace pressure drives a flow mediated by viscosity. We present the results of experiments on one…
Slippage and Nanorheology of Thin Liquid Polymer Films
Oliver Bäumchen, Renate Fetzer, Mischa Klos +4
Thin liquid films on surfaces are part of our everyday life, they serve e.g. as coatings or lubricants. The stability of a thin layer is governed by interfacial forces, described b…
Solid Surface Structure Affects Liquid Order at the Polystyrene/SAM Interface
Philipp Gutfreund, Oliver Bäumchen, Dorothee van der Grinten +5
We present a combined x-ray and neutron reflectivity study characterizing the interface between polystyrene (PS) and silanized surfaces. Motivated by the large difference in slip v…
Slip effects in polymer thin films
O. Baeumchen, K. Jacobs
Probing the fluid dynamics of thin films is an excellent tool to study the solid/liquid boundary condition. There is no need for external stimulation or pumping of the liquid due t…