213 citations · 741 across the 21 of their papers we have counts for
22 papers
Effects of surface viscosities on the motion of a droplet enclosing a translating particle
Ali Gürbüz, Hervé Nganguia, Guangpu Zhu +3
We investigate the influence of interfacial rheology on the motion of a compound particle consisting of a viscous droplet enclosing a translating rigid particle in the Stokes flow…
Soft-Lubrication Drainage and Rupture in Particle-Driven Vesicles
Yuan-Nan Young, Bryan Quaife, Herve Nganguia +3
The deformation and rupture of a lipid vesicle due to the forced normal approach of an inclusion are essential for optimizing the design of magnetic giant unilamellar vesicles [mag…
Self-diffusiophoretic propulsion of a spheroidal particle in a shear-thinning fluid
Guangpu Zhu, Brandon van Gogh, Lailai Zhu +2
Shear-thinning viscosity is a non-Newtonian behaviour that active particles often encounter in biological fluids such as blood and mucus. The fundamental question of how this ubiqu…
Propulsion of a three-sphere micro-robot in a porous medium
Chih-Tang Liao, Andrew Lemus, Ali Gürbüz +3
Microorganisms and synthetic microswimmers often encounter complex environments consisting of networks of obstacles embedded into viscous fluids. Such settings include biological m…
The effect of axisymmetric confinement on propulsion of a three-sphere microswimmer
Ali Gürbüz, Andrew Lemus, Ebru Demir +2
Swimming at the microscale has recently garnered substantial attention due to the fundamental biological significance of swimming microorganisms and the wide range of biomedical ap…
Viscoelastic levitation
Yunxing Su, Alfonso Castillo, On Shun Pak +2
The effects of viscoelasticity have been shown to manifest themselves via symmetry breaking. In this investigation, we show a novel phenomenon that arises from this idea. We observ…
Self-learning how to swim at low Reynolds number
Alan Cheng Hou Tsang, Pun Wai Tong, Shreyes Nallan +1
Synthetic microswimmers show great promise in biomedical applications such as drug delivery and microsurgery. Their locomotion, however, is subject to stringent constraints due to…
Swimming efficiency in a shear-thinning fluid
Herve Nganguia, Kyle Pietrzyk, On Shun Pak
Micro-organisms expend energy moving through complex media. While propulsion speed is an important property of locomotion, efficiency is another factor that may determine the swimm…
Propulsion via flexible flapping in granular media
Zhiwei Peng, Yang Ding, Kyle Pietrzyk +2
Biological locomotion in nature is often achieved by the interaction between a flexible body and its surrounding medium. The interaction of a flexible body with granular media is l…
Maximizing propulsive thrust of a driven filament at low Reynolds number via variable flexibility
Zhiwei Peng, Gwynn J. Elfring, On Shun Pak
At low Reynolds numbers the locomotive capability of a body can be dramatically hindered by the absence of inertia. In this work, we show how propulsive performance in this regime…
Characteristics of undulatory locomotion in granular media
Zhiwei Peng, On Shun Pak, Gwynn J. Elfring
Undulatory locomotion is ubiquitous in nature and observed in different media, from the swimming of flagellated microorganisms in biological fluids, to the slithering of snakes on…
Squirming through shear-thinning fluids
Charu Datt, Lailai Zhu, Gwynn J. Elfring +1
Many microorganisms find themselves immersed in fluids displaying non-Newtonian rheological properties such as viscoelasticity and shear-thinning viscosity. The effects of viscoela…
A note on the breathing mode of an elastic sphere in Newtonian and complex fluids
Vahe Galstyan, On Shun Pak, Howard A. Stone
Experiments on the acoustic vibrations of elastic nanostructures in fluid media have been used to study the mechanical properties of materials, as well as for mechanical and biolog…
Theoretical models in low-Reynolds-number locomotion
On Shun Pak, Eric Lauga
The locomotion of microorganisms in fluids is ubiquitous and plays an important role in numerous biological processes. In this chapter we present an overview of theoretical modelin…
Generalized squirming motion of a sphere
On Shun Pak, Eric Lauga
A number of swimming microorganisms such as ciliates () and multicellular colonies of flagellates () are approximately spherical in shape and swi…
Micropropulsion and microrheology in complex fluids via symmetry breaking
On Shun Pak, Lailai Zhu, Luca Brandt +1
Many biological fluids have polymeric microstructures and display non-Newtonian rheology. We take advantage of such nonlinear fluid behavior and combine it with geometrical symmetr…
Hydrodynamics of the double-wave structure of insect spermatozoa flagella
On Shun Pak, Saverio E. Spagnolie, Eric Lauga
In addition to conventional planar and helical flagellar waves, insect sperm flagella have also been observed to display a double-wave structure characterized by the presence of tw…
High-Speed Propulsion of Flexible Nanowire Motors: Theory and Experiments
On Shun Pak, Wei Gao, Joseph Wang +1
Micro/nano-scale propulsion has attracted considerable recent attention due to its promise for biomedical applications such as targeted drug delivery. In this paper, we report on a…
Extensibility enables locomotion under isotropic drag
On Shun Pak, Eric Lauga
Anisotropic viscous drag is usually believed to be a requirement for the low Reynolds number locomotion of slender bodies such as flagella and cilia. Here we show that locomotion u…
Pumping by flapping in a viscoelastic fluid
On Shun Pak, Eric Lauga
In a world without inertia, Purcell's scallop theorem states that in a Newtonian fluid a time-reversible motion cannot produce any net force or net flow. Here we consider the exten…
Two-dimensional flagellar synchronization in viscoelastic fluids
Gwynn J. Elfring, On Shun Pak, Eric Lauga
Experimental studies have demonstrated that spermatozoa synchronize their flagella when swimming in close proximity. In a Newtonian fluid, it was shown theoretically that such sync…
The transient swimming of a waving sheet
On Shun Pak, Eric Lauga
Small-scale locomotion plays an important role in biology. Different modelling approaches have been proposed in the past. The simplest model is an infinite inextensible two-dimensi…