We demonstrate new principles of microfluidic pumping and mixing by electronic components integrated into a microfluidic chip. The miniature diodes embedded into the microchannel walls rectify the voltage induced between their electrodes from an external alternating electric field. The resulting electroosmotic flows, developed in the vicinity of the diode surfaces, were utilized for pumping or ...

This paper presents numerical analysis of electroosmotic flows (EOF) in charged anisotropic porousmedia using the lattice Poisson-Boltzmannmethod (LPBM), which combines two sets of lattice evolution methods solving the nonlinear Poisson equation for electric potential distribution and the Navier-Stokes equations for fluid flow respectively. Consistent boundary condition implementations are prop...

Long-range electrostatic forces substantially influence bacterial interactions and bacterial adhesion during the preliminary steps of biofilm formation. The strength of these forces depends strongly on the structure of the bacterium surfaces investigated. The latter may be addressed from appropriate analysis of electrophoretic mobility measurements. Due to the permeable character of the bacteri...

To meet the demands of protein phosphorylation study, immobilized zirconium ion affinity chromatography (Zr(4+)-IMAC) monolith was prepared by combining UV-initiated polymerization of monolithic support and subsequent photografting in both capillary columns and microchannels. Hydrophilic poly(2-hydroxyethyl methacrylate (HEMA)-co-ethylene dimethacrylate (EDMA)) monolithic support was prepared u...

in this paper, numerical investigation of a flat passive micromixer with heterogeneous surface properties that the flow through it, is driven by the electroosmotic flow have been presented. the governing equations, which consist of a laplace equation for the distribution of external electric potential, a poisson equation for the distribution of electric double layer potential, modified navier-s...

Thousands of sites are contaminated with both heavy metals and organic compounds and these sites pose a major threat to the environment. Very few technologies, such as soil washing=flushing and stabilization=solidification, are available to remediate these sites; however, all these technologies are ineffective under low permeability and heterogeneous soil conditions. Previous studies have shown...

The members of the Committee appointed to examine the thesis of MIAO MIAO find it satisfactory and recommend that it be accepted. ___________________________________ Chair ___________________________________ ___________________________________ iii ACKNOLEDGEMENT I would like to thank my advisor Dr. Prashanta Dutta for the research guidance, patience and understanding during the past four years....

We report a microchip-based method for separating charged molecules according to electrophoretic mobility. The method is based on opposed electroosmotic, electrophoretic and convective forces. Similar to isoelectric focusing, solute can be accumulated into stationary zones, but without use of ampholytes. The method of "microchip countercurrent electroseparation" described here has potential app...