88 citations · 408 across the 21 of their papers we have counts for
22 papers
Elastohydrodynamics of 3D chemically active filaments
Matthew D Butler, Benjamin J Walker, Thomas Montenegro-Johnson +1
Active deformable filaments exhibit a large range of qualitatively different three-dimensional dynamics, depending on their flexibility, the strength and nature of the active forci…
Slender Phoretic Loops and Knots
Panayiota Katsamba, Matthew D. Butler, Lyndon Koens +1
We present an asymptotic theory for solving the dynamics of slender autophoretic loops and knots. Our formulation is valid for non-intersecting 3D centrelines, with arbitrary chemi…
The swelling and shrinking of spherical thermo-responsive hydrogels
Matthew D. Butler, Thomas D. Montenegro-Johnson
Thermo-responsive hydrogels are a promising material for creating controllable actuators for use in micro-scale devices, since they expand and contract significantly (absorbing or…
Slender Phoretic Theory of chemically active filaments
Panayiota Katsamba, Sébastien Michelin, Thomas D. Montenegro-Johnson
Artificial microswimmers, or "microbots" have the potential to revolutionise non-invasive medicine and microfluidics. Microbots that are powered by self-phoretic mechanisms, such a…
3-D Printed Swimming Microtori for Cargo Transport and Flow Manipulation
Remmi Baker, Thomas Montenegro-Johnson, Anton D. Sediako +4
Through billions of years of evolution, microorganisms mastered unique swimming behaviors to thrive in complex fluid environments. Limitations in nanofabrication have thus far hind…
Simulations of particle tracking in the oligociliated mouse node and implications for left-right symmetry breaking mechanics
Meurig T. Gallagher, Thomas D. Montenegro-Johnson, David J. Smith
The concept of internal anatomical asymmetry is familiar; usually in humans the heart is on the left and the liver is on the right, however how does the developing embryo know to p…
Efficient Implementation of Elastohydrodynamics via Integral Operators
Atticus L. Hall-McNair, Thomas D. Montenegro-Johnson, Hermes Gadelha +2
The dynamics of geometrically non-linear flexible filaments play an important role in a host of biological processes, from flagella-driven cell transport to the polymeric structure…
Thrifty swimming with shear-thinning
David A. Gagnon, Thomas D. Montenegro-Johnson
Microscale propulsion is integral to numerous biomedical systems, for example biofilm formation and human reproduction, where the surrounding fluids comprise suspensions of polymer…
Clustering-induced self-propulsion of isotropic autophoretic particles
Akhil Varma, Thomas D. Montenegro-Johnson, Sebastien Michelin
Self-diffusiophoretic particles exploit local concentration gradients of a solute species in order to self-propel at the micron scale. While an isolated chemically- and geometrical…
Microtransformers: controlled microscale navigation with flexible robots
Thomas D. Montenegro-Johnson
Artificial microswimmers are a new technology with promising microfluidics and biomedical applications, such as directed cargo transport, microscale assembly, and targeted drug del…
Fake s: A cautionary tail of shear-thinning locomotion
Thomas D. Montenegro-Johnson
Propulsion through fluids is a key component in the life cycle of many microbes, be it in development, infection, or simply finding nutrients. In systems of biomedical relevance, t…
The autophoretic torus
Lasse C. Schmieding, Eric Lauga, Thomas D. Montenegro-Johnson
Phoretic swimmers provide new avenues to study non-equilibrium statistical physics and are also hailed as a promising technology for bioengineering at the cellular scale. Exact sol…
Microscale Flow Dynamics of Ribbons and Sheets
Thomas D. Montenegro-Johnson, Lyndon Koens, Eric Lauga
Numerical study of the hydrodynamics of thin sheets and ribbons presents difficulties associated with resolving multiple length scales. To circumvent these difficulties, asymptotic…
Flow analysis of the low-Reynolds number swimmer C. elegans
Thomas D. Montenegro-Johnson, David A. Gagnon, Paulo E. Arratia +1
Swimming cells and microorganisms are a critical component of many biological processes. In order to better interpret experimental studies of low Reynolds number swimming, we combi…
Three-dimensional flow in Kupffer's Vesicle
Thomas D. Montenegro-Johnson, David I. Baker, David J. Smith +1
Whilst many vertebrates appear externally left-right symmetric, the arrangement of internal organs is asymmetric. In zebrafish, the breaking of left-right symmetry is organised by…
A regularised singularity approach to phoretic problems
Thomas D. Montenegro-Johnson, Sebastien Michelin, Eric Lauga
An efficient, accurate, and flexible numerical method is proposed for the solution of the swimming problem of one or more autophoretic particles in the purely-diffusive limit. The…
Geometric pumping in autophoretic channels
Sebastien Michelin, Thomas D. Montenegro Johnson, Gabriele De Canio +2
Many microfluidic devices use macroscopic pressure differentials to overcome viscous friction and generate flows in microchannels. In this work, we investigate how the chemical and…
The other optimal Stokes drag profile
Thomas D. Montenegro-Johnson, Eric Lauga
The lowest drag shape of fixed volume in Stokes flow has been known for some 40 years. It is front-back symmetric and similar to an American football with ends tangent to a cone of…
Spermatozoa scattering by a microchannel feature: an elastohydrodynamic model
Thomas Montenegro-Johnson, Hermes Gadelha, David J. Smith
Sperm traverse their microenvironment through viscous fluid by propagating flagellar waves; the waveform emerges as a consequence of elastic structure, internal active moments, and…
The Optimal Swimming Sheet
Thomas D. Montenegro-Johnson, Eric Lauga
Propulsion at microscopic scales is often achieved through propagating traveling waves along hair-like organelles called flagella. Taylor's two-dimensional swimming sheet model is…
Modelling the Fluid Mechanics of Cilia and Flagella in Reproduction and Development
Thomas D. Montenegro-Johnson, Andrew A. Smith, David J. Smith +2
Cilia and flagella are actively bending slender organelles, performing functions such as motility, feeding and embryonic symmetry breaking. We review the mechanics of viscous-domin…
Physics of Rheologically-Enhanced Propulsion: Different Strokes in Generalized Stokes
Thomas D. Montenegro-Johnson, Daniel Loghin, David J. Smith
Shear-thinning is an important rheological property of many biological fluids, such as mucus, whereby the apparent viscosity of the fluid decreases with shear. Certain microscopic…