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Electrokinetic Effects in Catalytic Pt-Insulator Janus Swimmers
S. Ebbens, D. A. Gregory, G. Dunderdale +4
The effect of added salt on the propulsion of Janus platinum-polystyrene colloids in hydrogen peroxide solution is studied experimentally. It is found that micromolar quantities of…
Instabilities and Topological Defects in Active Nematics
Sumesh P. Thampi, Ramin Golestanian, Julia M. Yeomans
We study a continuum model of an extensile active nematic to show that mesoscale turbulence develops in two stages: (i) ordered regions undergo an intrinsic hydrodynamic instabilit…
Emergent comet-like swarming of optically driven thermally active colloids
Jack A. Cohen, Ramin Golestanian
We propose a simple system of optically driven colloids that convert light into heat and move in response to self- and collectively- generated thermal gradients. We show that the s…
Clusters, asters and collective oscillations in chemotactic colloids
Suropriya Saha, Ramin Golestanian, Sriram Ramaswamy
The creation of synthetic systems that emulate the defining properties of living matter, such as motility, gradient-sensing, signalling and replication, is a grand challenge of bio…
Self-assembly of catalytically active colloidal molecules: Tailoring activity through surface chemistry
Rodrigo Soto, Ramin Golestanian
A heterogeneous and dilute suspension of catalytically active colloids is studied as a non-equilibrium analogue of ionic systems, which has the remarkable feature of action-reactio…
Run-and-tumble in a crowded environment: persistent exclusion process for swimmers
Rodrigo Soto, Ramin Golestanian
The effect of crowding on the run-and-tumble dynamics of swimmers such as bacteria is studied using a discrete lattice model of mutually excluding particles that move with constant…
Phase Dependent Forcing and Synchronization in the three-sphere model of Chlamydomonas
Rachel R. Bennett, Ramin Golestanian
The green alga {\it Chlamydomonas} swims with synchronized beating of its two flagella, and is experimentally observed to exhibit run-and-tumble behaviour similar to bacteria. Rece…
Quantum Cherenkov Radiation and Non-contact Friction
Mohammad F. Maghrebi, Ramin Golestanian, Mehran Kardar
We present a number of arguments to demonstrate that a quantum analog of Cherenkov effect occurs when two dispersive objects are in relative motion. Specifically we show that two s…
Velocity Correlations in an Active Nematic
Sumesh P. Thampi, Ramin Golestanian, Julia M. Yeomans
The flow properties of a continuum model for an active nematic is studied and compared with recent experiments on suspensions of microtubule bundles and molecular motors. The veloc…
Reply to Comment on 'Length Scale Dependence of DNA Mechanical Properties'
Agnes Noy, Ramin Golestanian
Reply to Comment on 'Length Scale Dependence of DNA Mechanical Properties'