152 citations · 380 across the 18 of their papers we have counts for
17 papers
Hydrodynamic Brachistochrone: Conflicting Paths of Time and Energy Minima within Viscous Media
Ramin Gasimli, Lei Yi, Shrabin Bajracharya +2
We experimentally and theoretically study the hydrodynamic analog of the classical brachistochrone problem: the {\it time-} and {\it energy-minimizing} paths for a spherical partic…
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…
Marangoni swimmer pushing particle raft under 1D confinement
Abhradeep Maitra, Anupam Pandey, Sebastien Michelin +1
Active matter systems, due to their spontaneous self-propulsion ability, hold potential for future applications in healthcare and environmental sustainability. Marangoni swimmers,…
Optimal free-surface pumping by an undulating carpet
Anupam Pandey, Zih-Yin Chen, Jisoo Yuk +5
Examples of fluid flows driven by undulating boundaries are found in nature across many different length scales. Even though different driving mechanisms have evolved in distinct e…
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…
Corona splashing triggered by a loose monolayer of particles
Ehsan Esmaili, Zih-Yin Chen, Anupam Pandey +3
In nature, high-speed raindrops often impact and spread on particulate surfaces (e.g., soil, plant leaves with spores or pollen). We study the dynamics of droplet impact on a loose…
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…
Elastic Rayleigh-Plateau instability: Dynamical selection of nonlinear states
Anupam Pandey, Minkush Kansal, Miguel A. Herrada +2
A slender thread of elastic hydrogel is susceptible to a surface instability that is reminiscent of the classical Rayleigh-Plateau instability of liquid jets. The final, highly non…
Regimes of Soft Lubrication
Martin Essink, Anupam Pandey, Stefan Karpitschka +2
Elastohydrodynamic lubrication, or simply soft lubrication, refers to the motion of deformable objects near a boundary lubricated by a fluid, and is one of the key physical mechani…
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…
The relationship between viscoelasticity and elasticity
J. H. Snoeijer, A. Pandey, M. A. Herrada +1
We consider models for elastic liquids, such as solutions of flexible polymers. They introduce a relaxation time into the system, over which stresses relax. We study the kinema…
Hydrogel menisci: Shape, interaction, and instability
Anupam Pandey, Charlotte L. Nawijn, Jacco H. Snoeijer
The interface of a soft hydrogel is easily deformed when it is in contact with particles, droplets or cells. Here we compute the intricate shapes of hydrogel menisci due to the ind…
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…
Inverted Cheerios effect: Liquid drops attract or repel by elasto-capillarity
S. Karpitschka, A. Pandey, L. A. Lubbers +5
Solid particles floating at a liquid interface exhibit a long-ranged attraction mediated by surface tension. In the absence of bulk elasticity, this is the dominant lateral interac…
Lubrication of soft viscoelastic solids
Anupam Pandey, Stefan Karpitschka, Kees Venner +1
Lubrication flows appear in many applications in engineering, biophysics, and in nature. Separation of surfaces and minimisation of friction and wear is achieved when the lubricati…
Dynamics of Snapping Beams and Jumping Poppers
Anupam Pandey, Derek E. Moulton, Dominic Vella +1
We consider the dynamic snapping instability of elastic beams and shells. Using the Kirchhoff rod and Föppl-von Kármán plate equations, we study the stability, deformation modes, a…