75 citations · 442 across the 30 of their papers we have counts for
31 papers
Cage Breaking Far from Equilibrium
Jared Popowski, Nico Schramma, Edan Lerner +1
Active matter can flow and yield under conditions where passive matter jams and slows down, as self-propulsion significantly modulates particle escape from local cages. How activit…
Non-Reciprocal Capillary Waves
Holly du Plessis, Pedro Cosme, Hugo França +1
Capillary waves are a classical free-surface phenomenon in fluid mechanics, yet their behavior in chiral fluids remains largely unexplored. We show that odd viscosity breaks the re…
Coalescence of Printed Yield Stress Filaments in Direct Ink Writing
Hugo L. França, Daniël Tieman, James D. Shemilt +2
In direct ink writing (DIW), neighbouring filaments of yield-stress inks are deposited side-by-side and are expected to merge into smooth, mechanically robust structures. Unlike Ne…
Rheology of Two-Dimensional Dilute Emulsions
Thomas Appleford, Vatsal Sanjay, Maziyar Jalaal
The single droplet under shear is a foundational problem in fluid mechanics. In computational fluid dynamics, the two-dimensional (2D) formulation offers advantages in both computa…
Spreading droplets of yield-stress fluids with and without gravity
Linnea Heitmeier, Olfa D'Angelo, Maziyar Jalaal +1
We investigate the effect of gravity on the spreading of droplets of yield stress fluids, by performing both microgravity experiments (in a drop tower) and experiments under terres…
Bouncing microdroplets on hydrophobic surfaces
Jamie Mclauchlan, Jim S. Walker, Vatsal Sanjay +4
Intuitively, slow droplets stick to a surface and faster droplets splash or bounce. However, recent work suggests that on non-wetting surfaces, whether microdroplets stick or bounc…
Odd Droplets: Fluids with Odd Viscosity and Highly Deformable Interfaces
Hugo França, Maziyar Jalaal
Flows with deformable interfaces are commonly controlled by applying an external field or modifying the boundaries that interact with the fluid, but realizing such solutions can be…
Laser-induced droplet deformation: curvature inversion explained from instantaneous pressure impulse
Hugo França, Hermann Karl Schubert, Oscar Versolato +1
We investigate the shape of a tin sheet formed from a droplet struck by a nanosecond laser pulse. Specifically, we examine the dynamics of the process as a function of laser beam p…
Optimal disk packing of chloroplasts in plant cells
Nico Schramma, Eric R. Weeks, Maziyar Jalaal
Photosynthesis is vital for the survival of entire ecosystems on Earth. While light is fundamental to this process, excessive exposure can be detrimental to plant cells. Chloroplas…
Glandular Trichome Rupture in Tomato Plants is an Ultra-Fast & Sensitive Defense Mechanism Against Insects
Jared Popowski, Lucas Warma, Alicia Abarca Cifuentes +2
Trichomes, specialized hair-like structures on the surfaces of many plants, play a crucial role in defense against herbivorous insects. We investigated the biomechanics of type VI…
ActiveCheerios: 3D-Printed Marangoni-Driven Active Particles at an Interface
Jackson K. Wilt, Nico Schramma, Jan-Willem Bottermans +1
Marangoni surfers are simple, cost-effective tabletop experiments that, despite their simplicity, exhibit rich dynamics and collective behaviors driven by physicochemical mechanism…
Bursting bubble in an elasto-viscoplastic medium
A. G. Balasubramanian, V. Sanjay, M. Jalaal +2
A gas bubble sitting at a liquid-gas interface can burst following the rupture of the thin liquid film separating it from the ambient, owing to the large surface energy of the resu…
Fragmentation and aggregation of cyanobacterial colonies
Yuri Z. Sinzato, Robert Uittenbogaard, Petra M. Visser +2
Fluid flow has a major effect on the aggregation and fragmentation of bacterial colonies. Yet, a generic framework to understand and predict how hydrodynamics affects colony size r…
Morphodynamics of chloroplast network control light-avoidance response in the non-motile dinoflagellate Pyrocystis lunula
Nico Schramma, Gloria Casas Canales, Maziyar Jalaal
Photosynthetic algae play a significant role in oceanic carbon capture. Their performance, however, is constantly challenged by fluctuations in environmental light conditions. Here…
Optimal shape design of printing nozzles for extrusion-based additive manufacturing
Tomas Schuller, Maziyar Jalaal, Paola Fanzio +1
The optimal design seeks the best possible solution(s) for a mechanical structure, device, or system, satisfying a series of requirements and leading to the best performance. In th…
Ductile-to-brittle transition and yielding in soft amorphous materials: perspectives and open questions
Thibaut Divoux, Elisabeth Agoritsas, Stefano Aime +37
Soft amorphous materials are viscoelastic solids ubiquitously found around us, from clays and cementitious pastes to emulsions and physical gels encountered in food or biomedical e…
Billiards with Spatial Memory
Thijs Albers, Stijn Delnoij, Nico Schramma +1
Many classes of active matter develop spatial memory by encoding information in space, leading to complex pattern formation. It has been proposed that spatial memory can lead to mo…
Elasto-viscoplastic Spreading: from Plastocapillarity to Elastocapillarity
Hugo L. Franc, Maziyar Jalaal, Cassio M. Oishi
We study the spreading of elastoviscoplastic (EVP) droplets under surface tension effects. The non- Newtonian material flows like a viscoelastic liquid above the yield stress and b…
Arrested on heating: controlling the motility of active droplets by temperature
Prashanth Ramesh, Yibo Chen, Petra Räder +3
Self-propelling active matter relies on the conversion of energy from the undirected, nanoscopic scale to directed, macroscopic motion. One of the challenges in the design of synth…
Viscoplastic Lines: Printing a Single Filament of Yield Stress Material on a Surface
Jesse van der Klok, Daniël Tieman, Maziyar Jalaal
This study presents the spreading of a single filament of a yield stress (viscoplastic) fluid extruded onto a pre-wetted solid surface. The filaments spread laterally under surface…
Interfacial aggregation of self-propelled Janus colloids in sessile droplets
Maziyar Jalaal, Borge ten Hagen, Hai le The +3
Living microorganisms in confined systems typically experience an affinity to populate boundaries. The reason for such affinity to interfaces can be a combination of their directed…
Elastocapillary Worthington jets
Uddalok Sen, Detlef Lohse, Maziyar Jalaal
The retraction of an impacting droplet on a non-wetting substrate is often associated with the formation of a Worthington jet, which is fed by the retracting liquid. A non-Newtonia…
Sessile drop evaporation in a gap -- crossover between diffusion-limited and phase transition-limited regime
S. Hartmann, C. Diddens, M. Jalaal +1
We consider the time evolution of a sessile drop of volatile partially wetting liquid on a rigid solid substrate. Thereby, the drop evaporates under strong confinement, namely, it…
Spreading of droplets under various gravitational accelerations
Olfa D'Angelo, Felix Kuthe, Kasper van Nieuwland +3
We describe a setup to perform systematic studies on the spreading of droplets of complex fluids under microgravity conditions. Tweaking the gravitational acceleration under which…