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Now showing items 11-20 of 37
Hydrodynamic interactions between nearby slender filaments
(IOP PublishingEPL (Europhysics Letters), 2016-11-28)
Cellular biology abound with filaments interacting through fluids, from intracellular microtubules, to rotating flagella and beating cilia. While previous work has demonstrated the complexity of capturing nonlocal hydrodynamic ...
Clustering instability of focused swimmers
(IOP PublishingEurophysics Letters, 2017-02-09)
One of the hallmarks of active matter is its rich nonlinear dynamics and instabilities. Recent numerical simulations of phototactic algae showed that a thin jet of swimmers, obtained from hydrodynamic focusing inside a ...
Phoretic flow induced by asymmetric confinement
(Cambridge University PressJournal of Fluid Mechanics, 2016-06-28)
Internal phoretic flows due to the interactions of solid boundaries with local chemical gradients may be created using chemical patterning. Alternatively, we demonstrate here that internal flows might also be induced by ...
A two-fluid model for locomotion under self-confinement
(American Physical SocietyPhysical Review Fluids, 2017-09-01)
The bacterium Helicobacter pylori causes ulcers in the stomach of humans by invading mucus layers protecting epithelial cells. It does so by chemically changing the rheological properties of the mucus from a high-viscosity ...
Spontaneous oscillations of elastic filaments induced by molecular motors.
(The Royal SocietyJournal of the Royal Society, Interface, 2017-11)
It is known from the wave-like motion of microtubules in motility assays that the piconewton forces that motors produce can be sufficient to bend the filaments. In cellular phenomena such as cytosplasmic streaming, molecular ...
Structured light enables biomimetic swimming and versatile locomotion of photoresponsive soft microrobots
(Nature Publishing GroupNature Materials, 2016-02-15)
Microorganisms move in challenging environments by periodic changes in body shape. In contrast, current artificial microrobots cannot actively deform, exhibiting at best passive bending under external fields. Here, by ...
Propulsion of Bubble-Based Acoustic Microswimmers
(American Physical SocietyPhysical Review Applied, 2015-12-29)
Acoustic microswimmers present a great potential for microfluidic applications and targeted drug delivery. Here, we introduce armored microbubbles (size range, 10–20 μm) made by three-dimensional microfabrication, which ...
Small-amplitude swimmers can self-propel faster in viscoelastic fluids
(ElsevierJournal of Theoretical Biology, 2015-07-08)
Many small organisms self-propel in viscous fluids using travelling wave-like deformations of their bodies or appendages. Examples include small nematodes moving through soil using whole-body undulations or spermatozoa ...
Enhanced active swimming in viscoelastic fluids
(IOP PublishingEurophysics Letters, 2014-11-05)
Swimming microorganisms often self-propel in fluids with complex rheology. While past theoretical work indicates that fluid viscoelasticity should hinder their locomotion, recent experiments on waving swimmers suggest a ...
Bacterial Hydrodynamics
(Annual ReviewsAnnual Review of Fluid Mechanics, 2016)
Bacteria predate plants and animals by billions of years. Today, they are the
world’s smallest cells, yet they represent the bulk of the world’s biomass
and the main reservoir of nutrients for higher organisms. Most bacteria ...