135 citations · 593 across the 20 of their papers we have counts for
14 papers · 1 filter
Emergent dynamics due to chemo-hydrodynamic self-interactions in active polymers
Manoj Kumar, Aniruddh Murali, Arvin Gopal Subramaniam +2
The field of synthetic active matter has, thus far, been led by efforts to create point-like, isolated (yet interacting) self-propelled objects (\emph{e.g.} colloids, droplets, mic…
Stokes traction on an active particle
Günther Turk, Rajesh Singh, Ronojoy Adhikari
The mechanics and statistical mechanics of a suspension of active particles are determined by the traction (force per unit area) on their surfaces. Here we present an exact solutio…
Self-propulsion of active droplets without liquid-crystalline order
Rajesh Singh, Elsen Tjhung, Michael E. Cates
The swimming of cells, far from any boundary, can arise in the absence of long-range liquid-crystalline order within the cytoplasm, but simple models of this effect are lacking. He…
Controlled Optofluidic Crystallization of Colloids Tethered at Interfaces
Alessio Caciagli, Rajesh Singh, Darshana Joshi +2
We report experiments that show rapid crystallization of colloids tethered to an oil-water interface in response to laser illumination. This light-induced transition is due to a co…
Periodic Orbits of Active Particles induced by Hydrodynamic Monopoles
Austen Bolitho, Rajesh Singh, R. Adhikari
Terrestrial experiments on active particles, such as Volvox, involve gravitational forces, torques and accompanying monopolar fluid flows. Taking these into account, we analyse the…
PyStokes: phoresis and Stokesian hydrodynamics in Python
Rajesh Singh, R. Adhikari
We present a modular Python library for computing many-body hydrodynamic and phoretic interactions between spherical active particles in suspension, when these are given by solutio…
Hydrodynamically interrupted droplet growth in scalar active matter
Rajesh Singh, M. E. Cates
Suspensions of spherical active particles often show microphase separation. At a continuum level, coupling their scalar density to fluid flow, there are two distinct explanations.…
Competing chemical and hydrodynamic interactions in autophoretic colloidal suspensions
Rajesh Singh, R. Adhikari, M. E. Cates
At the surfaces of autophoretic colloids, slip velocities arise from local chemical gradients that are many-body functions of particle configuration and activity. For rapid chemica…
Flow-induced phase separation of active particles is controlled by boundary conditions
Shashi Thutupalli, Delphine Geyer, Rajesh Singh +2
Active particles, including swimming microorganisms, autophoretic colloids and droplets, are known to self-organize into ordered structures at fluid-solid boundaries. The entrainme…
Direct verification of the fluctuation-dissipation relation in viscously coupled oscillators
Shuvojit Paul, Abhrajit Laskar, Rajesh Singh +3
The fluctuation-dissipation relation, a central result in non-equilibrium statistical physics, relates equilibrium fluctuations in a system to its linear response to external force…
Fluctuating hydrodynamics and the Brownian motion of an active colloid near a wall
Rajesh Singh, R. Adhikari
The traction on the surface of a spherical active colloid in a thermally fluctuating Stokesian fluid contains passive, active, and Brownian contributions. Here we derive these thre…
Universal hydrodynamic mechanisms for crystallization in active colloidal suspensions
Rajesh Singh, R. Adhikari
The lack of detailed balance in active colloidal suspensions allows dissipation to determine stationary states. Here we show that slow viscous flow produced by polar or apolar acti…
Generalized Stokes laws for active colloids and their applications
Rajesh Singh, R. Adhikari
The force per unit area on the surface of a colloidal particle is a fundamental dynamical quantity in the mechanics and statistical mechanics of colloidal suspensions. Here we comp…
Many-body microhydrodynamics of colloidal particles with active boundary layers
Rajesh Singh, Somdeb Ghose, R. Adhikari
Colloidal particles with active boundary layers - regions surrounding the particles where nonequilibrium processes produce large velocity gradients - are common in many physical, c…