122 citations · 327 across the 10 of their papers we have counts for
10 papers
Diffusion, phase behavior and gelation in a two-dimensional layer of colloids in osmotic equilibrium with a polymer reservoir
Sam E Griffiths, Nick Koumakis, Aidan T Brown +3
The addition of enough non-adsorbing polymer to an otherwise stable colloidal suspension gives rise to a variety of phase behavior and kinetic arrest due to the depletion attractio…
Dynamic optical rectification and delivery of active particles
Nick Koumakis, Aidan T. Brown, Jochen Arlt +3
We use moving light patterns to control the motion of {\it Escherichia coli} bacteria whose motility is photo-activated. Varying the pattern speed controls the magnitude and direct…
Motile bacteria in a critical fluid mixture
Nick Koumakis, Clémence Devailly, Wilson C. K. Poon
We studied the swimming of \textit{Escherichia coli} bacteria in the vicinity of the critical point in a solution of the non-ionic surfactant \chem{C_{12}E_{5}} in buffer solution.…
Colloidal Gels Tuned by Oscillatory Shear
E. Moghimi, A. R. Jacob, N. Koumakis +1
We examine microstructural and mechanical changes which occur during oscillatory shear flow and reformation after flow cessation of an intermediate volume fraction colloidal gel us…
Start-up Shear of Concentrated Colloidal Hard Spheres: Stresses, Dynamics and Structure
N. Koumakis, M. Laurati, A. R. Jacob +6
The transient response of model hard sphere glasses is examined during the application of steady rate start-up shear using Brownian Dynamics (BD) simulations, experimental rheology…
Amorphous and ordered states of concentrated hard spheres under oscillatory shear
Nick Koumakis, John F. Brady, George Petekidis
Hard sphere colloidal particles are a basic model system for general research into phase behavior, ordering and out-equilibrium glass transitions. Experimentally it has been shown…