70 citations · 472 across the 33 of their papers we have counts for
20 papers · 1 filter
Evaporation-Induced Pattern Formation and Wetting in Active Microtubule-Kinesin Droplets
Vahid Nasirimarekani, Mehrana R. Nejad, Olinka Ramírez-Soto +4
Active networks composed of biopolymers and motor proteins provide versatile biomimetic systems that have advanced active matter physics and deepened our understanding of cytoskele…
Creases as elastocapillary gates for autonomous droplet control
Zixuan Wu, Gavin Linton, Stefan Karpitschka +1
Droplets are the core functional units in microfluidic technologies that aim to integrate computation and reaction on a single platform. Achieving directed transport and control of…
Vapor-mediated wetting and imbibition control on micropatterned surfaces
Ze Xu, Raphael Saiseau, Olinka Ramírez Soto +1
Wetting of micropatterned surfaces is ubiquitous in nature and key to many technological applications like spray cooling, inkjet printing, and semiconductor processing. Overcoming…
Non-monotonic motion of sliding droplets on strained soft solids
Youchuang Chao, Hansol Jeon, Stefan Karpitschka
Soft materials are ubiquitous in technological applications that require deformability, for instance, in flexible, water-repellent coatings. However, the wetting properties of pre-…
Wetting ridge dissipation at large deformations
Martin H. Essink, Stefan Karpitschka, Hamza K. Khattak +3
Liquid drops slide more slowly over soft, deformable substrates than over rigid solids. This phenomenon can be attributed to the viscoelastic dissipation induced by the moving wett…
Pattern formation under mechanical stress in active biological networks confined inside evaporating droplets
Vahid Nasirimarekani, Olinka Ramìrez-Soto, Stefan Karpitschka +1
Active networks made of biopolymers and motor proteins are valuable bioinspired systems that have been used in the last decades to study the cytoskeleton and its self-organization…
Reversal of Solvent Migration in Poroelastic Folds
Mees M. Flapper, Anupam Pandey, Stefan Karpitschka +1
Polymer networks and biological tissues are often swollen by a solvent, such that their properties emerge from a coupling between swelling and elastic stress. This poroelastic coup…
How liquid-liquid phase separation induces active spreading
Youchuang Chao, Olinka Ramirez-Soto, Christian Bahr +1
The interplay between phase separation and wetting of multicomponent mixtures is ubiquitous in nature and technology and recently gained significant attention across scientific dis…
Stick-Slip Contact Line Motion on Kelvin-Voigt Model Substrates
Dominic Mokbel, Sebastian Aland, Stefan Karpitschka
The capillary traction of a liquid contact line causes highly localized deformations in soft solids, tremendously slowing down wetting and dewetting dynamics by viscoelastic brakin…
Effects of direction reversals on patterns of active filaments
Leila Abbaspour, Ali Malek, Stefan Karpitschka +1
Active matter systems provide fascinating examples of pattern formation and collective motility without counterparts in equilibrium systems. Here, we employ Brownian dynamics simul…
Pinning-induced folding-unfolding asymmetry in adhesive creases
Michiel A. J. van Limbeek, Martin H. Essink, Anupam Pandey +2
The compression of soft elastic matter and biological tissue can lead to creasing, an instability where a surface folds sharply into periodic self-contacts. Intriguingly, the unfol…
Evaporative self-assembly of motile droplets
Anton Molina, Shailabh Kumar, Stefan Karpitschka +1
Self-assembly is the underlying building principle of biological systems and represents a promising approach for the future of manufacturing, but the yields are often limited by un…
On the singular nature of the elastocapillary ridge
A. Pandey, B. Andreotti, S. Karpitschka +3
The functionality of soft interfaces is crucial to many applications in biology and surface science. Recent studies have used liquid drops to probe the surface mechanics of elastom…
Peeling an elastic film from a soft viscoelastic adhesive: experiments and scaling laws
Hugo Perrin, Antonin Eddi, Stefan Karpitschka +2
The functionality of adhesives relies on their response under the application of a load. Yet, it has remained a challenge to quantitatively relate the macroscopic dynamics of peeli…
Spreading on viscoelastic solids: Are contact angles selected by Neumann's law?
M. van Gorcum, S. Karpitschka, B. Andreotti +1
The spreading of liquid drops on soft substrates is extremely slow, owing to strong viscoelastic dissipation inside the solid. A detailed understanding of the spreading dynamics ha…
Dynamic solid surface tension causes droplet pinning and depinning
Mathijs van Gorcum, Bruno Andreotti, Jacco H. Snoeijer +1
The contact line of a liquid drop on a solid exerts a nanometrically sharp surface traction. This provides an unprecedented tool to study highly localised and dynamic surface defor…
Cusp-shaped Elastic Creases and Furrows
S. Karpitschka, J. Eggers, A. Pandey +1
The surfaces of growing biological tissues, swelling gels, and compressed rubbers do not remain smooth, but frequently exhibit highly localized inward folds. We reveal the morpholo…
Dynamical Theory of the Inverted Cheerios Effect
Anupam Pandey, Stefan Karpitschka, Luuk A. Lubbers +5
Recent experiments have shown that liquid drops on highly deformable substrates exhibit mutual interactions. This is similar to the Cheerios effect, the capillary interaction of so…
Surface Tension regularizes the Crack Singularity of Adhesive Contacts
Stefan Karpitschka, Leen van Wijngaarden, Jacco H. Snoeijer
The elastic and adhesive properties of a solid surface can be quantified by indenting it with a rigid sphere. Indentation tests are classically described by the JKR-law when the so…
Surface nanobubbles: Seeing is believing
Stefan Karpitschka, Erik Dietrich, James R. T. Seddon +3
The existence of surface nanobubbles has been previously suggested using various experimental techniques, including attenuated total reflection spectroscopy, quartz crystal microba…