94 citations · 362 across the 11 of their papers we have counts for
11 papers
Undulatory swimming in viscoelastic fluids under confinement
D. Gagnon, B. Thomases, R. D. Guy +1
Low Reynolds number swimmers frequently move near boundaries, such as spirochetes moving through porous tissues and sperm navigating the reproductive tract. Furthermore, these micr…
Polymers in Swarming Bacterial Turbulence
Ranjiangshang Ran, David A. Gagnon, Alexander Morozov +1
We experimentally investigate the effects of polymer additives on the collective dynamics of swarming Serratia marcescens in quasi two-dimensional (2D) liquid films. We find that e…
Shear-induced gelation of self-yielding active networks
David A. Gagnon, Claudia Dessi, John P. Berezney +4
Molecular-motor generated active stresses drive the cytoskeleton away from equilibrium, endowing it with tunable mechanical properties that are essential for diverse functions such…
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…
The cost of swimming in generalized Newtonian fluids: Experiments with C. elegans
David A. Gagnon, Paulo E. Arratia
Numerous natural processes are contingent on microorganisms' ability to swim through fluids with non-Newtonian rheology. Here, we use the model organism Caenorhabditis elegans and…
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…
Undulatory swimming in shear-thinning fluids: Experiments with C. elegans
David A. Gagnon, Nathan C. Keim, Paulo E. Arratia
The swimming behaviour of microorganisms can be strongly influenced by the rheology of their fluid environment. In this manuscript, we experimentally investigate the effects of she…
Fluid-Induced Propulsion of Rigid Particles in Wormlike Micellar Solutions
David A. Gagnon, Nathan C. Keim, Xiaoning Shen +1
In the absence of inertia, a reciprocal swimmer achieves no net motion in a viscous Newtonian fluid. Here, we investigate the ability of a reciprocally actuated particle to transla…
Undulatory swimming in fluids with polymer networks
D. A. Gagnon, X. N. Shen, P. E. Arratia
The motility behavior of the nematode Caenorhabditis elegans in polymeric solutions of varying concentrations is systematically investigated in experiments using tracking and veloc…
Micron-scale droplet deposition on a hydrophobic surface using a retreating syringe
Bian Qian, Melissa Loureiro, David Gagnon +2
Droplet deposition onto a hydrophobic surface is studied experimentally and numerically. A wide range of droplet sizes can result from the same syringe, depending strongly on the n…
Minimal Model for Hydrodynamic Synchronization
Bian Qian, Hongyuan Jiang, David A. Gagnon +2
Motivated by the observed coordination of nearby beating cilia, we use a scale model experiment to show that hydrodynamic interactions can cause synchronization between rotating pa…