joshuadijksman

Making photoelastic particle molds

Q800 troubles

Whyyyy is this space so tinyyy

15 seconds of fame in our university newspaper

Sustaining the questionable cycle of systematic self-promotion…

Spanning the scales of granular materials through microscopic force imaging

Check out the paper on contact force imaging on compressed hydrogel spheres, done at Duke University. Don’t forget the associated discrete element modeling work.

Teaching General Chemistry 2 PCC12403

It never hurts to brush up on your chemistry. Well actually it does hurt, but it’s also fun.

Spanning the scales of granular materials through microscopic force imaging

N. Brodu, J.A. Dijksman, R.P. Behringer — Nature Communications 6 (2015) 10.1038/ncomms7361

Self-assembly in a near-frictionless granular material: Conformational structures and transitions in uniaxial cyclic compression of hydrogel spheres

Detecting network structures in packings of cyclically loaded spheres requires math. Lots of math…. D.M. Walker, A. Tordesillas, N. Brodu, J.A. Dijksman, R.P. Behringer, G. Froyland — Soft Matter 11, 2157–2173 (2015) 10.1039/c4sm02384f

Obtaining self-similar scalings in focusing flows

Measuring power laws is hard! Fortunately, Newtonian fluids are well behaved. J.A. Dijksman, S. Mukhopadhyay, C. Gaebler, T.P. Witelski, R.P. Behringer — Physical Review. E, Statistical nonlinear, and soft matter physics 92 (2015) 10.1103/PhysRevE.92.043016

Multiple-contact discrete-element model for simulating dense granular media

Deformable spheres in a packing under compression can develop additional physics when new contacts are created due to their deformability and volume conservation. Here we introduce a DEM code that can calculate these consequences. N. Brodu, J.A. Dijksman, R.P. Behringer — Physical Review. E, Statistical nonlinear, and soft matter physics 91 (2015) 10.1103/PhysRevE.91.032201

A simple low pressure drop suspension-based microfluidic mixer

Mixing stuff in very viscous fluids, or better said: at low Reynolds number, is not easy. Here is a microfluidics tool that allows one to do so anyway. It uses a simple small magnet aka stirring bar in a small chamber. M.J. Workamp, V. Saggiomo, J.A. Dijksman — Journal of Micromechanics and Microengineering 25 (2015)Continue reading “A simple low pressure drop suspension-based microfluidic mixer”