Gleeson J.P. – TechConnect Briefs

Infinitely fast reactions in micromixers

Gleeson J.P., University College Cork, Ireland, IE

Efficient mixing to promote chemical reactions is extremely desirable in lab-on-a-chip microfluidic devices, but is difficult to achieve in the typical low Reynolds-number flows. Numerical simulation of the high Peclet-number case common in microfluidics is [...]

Interaction of Coupled Particles Based on Lennard-Jones and Spring Forces in Brownian Ratchet Devices

Retkute R., Gleeson J.P., University College Cork, IE

Electrophoresis is a technique used to separate polyelectrolyte strands of different lengths. One of its fields of application in nanotechnology is in the separation of DNA. Chains of particles can undergo net transport on a [...]

Stochastic Analysis of Particle-Pair Transport in Brownian Ratchet Device

Retkute R., Gleeson J.P., University College Cork, IE

The motion of particle pairs in a Brownian ratchet device is studied using Langevin simulations. A Lennard-Jones interaction between the particles is added to a standard spring-bead model. The effects of such interaction upon a [...]

Taylor Dispersion in Electroosmotic Flows with Random Zeta Potentials

Gleeson J.P., Stone H.A., University College Cork, IE

Electroosmotic flows are extensively employed for fluid transport and sample separation in lab-on-a-chip technologies, capillary zone electrophoresis, and generally in channels and capillaries with length scales on the order of 100 microns or less. Experimental [...]

Modelling Annular Micromixers

Gleeson J.P., Roche O.M., West J., Gelb A., University College Cork, IE

The search for efficient mixing methods in the low Reynolds numbers flows typical of lab-on-a-chip technology has led us to propose an annular magnetohydrodynamic micromixer, currently under construction at the NMRC. In this talk we [...]

A Study of the Behaviour of Magnetic Microactuators

Flynn M., Gleeson J.P., University College Cork, IR

The behavior of an idealized magnetic microactuator is modeled and analyzed. A two parameter mass-spring model is shown to exhibit a bifurcation from one to three steady states as the geometry of the device is [...]

Magnetohydrodynamic Micromixing

Gleeson J.P., West J., University College Cork, IR

Modeling of magnetohydrodynamic (MHD) pumping in an annular microchannel is reduced to a two-dimensional Poisson equation for the azimuthal velocity. A method for enhancing the mixing of fluids is proposed, and is proven to yield [...]

Electroosmotic Microfluidic Flows with Random Zeta Potential

Gleeson J.P., University College Cork, IR

Average electroosmotic ows in the presence of axially-varying zeta potentials are shown to be plug-like, with variances which depend on radial position across the capillary. Consequences for the dispersion of samples are examined theoretically and [...]