This study focuses on the development of current-perpendicular-to plane (CPP) Giant Magnetoresistance (GMR) of
CoNiCu/Cu multilayered nanowire based microfluidic sensors for the detection of magnetic nanoparticles and fluids.
The visible measurable variations in electrical voltage due to changes in external magnetic field are later to be
monitored in microfluidic biosensor for the detection of toxicants in cells. An early prototype device was fabricated and
tested using both an aqueous nonmagnetic medium (water) and a commercially available ferrofluid solution. A
magnetic field of 0.01T caused a resistance change of 1.37% for ferrofluid, while a 1.1% GMR was recorded for the
The product distribution of fast-competitive reactions is a function of the speed at which the mixing of the two reactants occurs. Micro-fluidic mixers (micromixers) are touted as one area that micro-fluidic devices have fundamental advantages over traditional chemical processing equipment. Micromixers must demonstrate a significant advantage over the best current processing equipment if micromixers are to be implemented in current applications by the very conservative chemical industry. In this study, the mixing performance of a small diameter mixing tee was compared to the mixing performance of a commercial static mixer. In both studies, the hydrolysis of dimethoxypropane was measured quantitatively using gas chromatography. To date, a 177 micron mixing tee and 254 micron mixing tee have been tested and compared with a 1/4 inch and 1/8 inch commercial static mixer. At constant Reynolds numbers, the 254 micron micro-mixer is superior to the 1/4 inch static mixer and the 177 micron micro-mixer is superior to the 1/8 inch static mixer. Reynolds numbers of only 1180 and 410 have been obtained for the 254 micron and 177 micron mixing tee to date. Changes are being implemented to allow operation of higher Reynolds numbers with even smaller diameter mixing tees fabricated from silicon.