Electroactive hydrodynamic weirs for microparticle manipulation and patterning

Electroactive hydrodynamic weirs for microparticle manipulation and patterning.

We present a platform for parallelized manipulations of individual polarizable micron-scale particles (i.e., microparticles) that combines negative dielectrophoretic forcing with the passive capture of hydrodynamic weir-based trapping. Our work enables manipulations using ejection- andor exclusion-based methods. In ejection operations, we unload targeted weirs by displacing microparticles from ...

Microparticle manipulation using inertial forces

We demonstrate controlled manipulation of large quantities of microparticles on a surface using inertial forces. Motion is induced by applying a periodic parabolic wave form to a shear-polarized piezoelectric plate coupled to a substrate on which the particles reside. Particles move in steps of 10 to 50 nm per cycle, and the particle motion is mass selective. Particle velocity is varied by chan...

Optofluidic Devices for Cell, Microparticle, and Nanoparticle Manipulation

Electrohydrodynamic Flow for Microfluidic Mixing and Microparticle Manipulation

We discuss the mechanisms by which bulk electrohydrodynamic air thrust or ionic wind generated above and directed towards the surface of a microfluidic chamber by a sharp electrode tip can give rise to surface or bulk liquid recirculation in the chamber and demonstrate various ways in which the phenomenon can be exploited for microfluidic mixing and particle trapping. In the latter, micropartic...

Manipulation Microparticle Polystyrene Microparticles as Handles

Varun Saxena Using a fixed beam with a fundamental Gaussian mode, a gradient force optical trap was used to translate a single cell using a carboxylated polystyrene bead as a handle. Currently, the force with which the optical trap can manipulate an individual cell alone is very weak. In fact, the inadequate nature of the optical trap on living cells has prevented this technique from being usef...