A microfluidic manifold has been designed, fabricated, and tested which hydrodynamically focuses a sample into the center of a microchannel and provides control over the vertical position of the focused sample via the flow-rates of the focusing fluids [1]. To characterize the focusing action, a mixing experiment was performed in which the sample fluid and focusing fluid contained spectrally uni...

We succeeded in fabrication of a free accessible microchannel using an air-liquid interface. To pattern the air-liquid interface in the microfluidic chip, we utilized nano-geometric surface which encloses micropatterned massive nanopillars to enhance the wettability of the surface, which was fabricated by using the hybrid mask lithography technique. Novelties of this paper are shown as follows....

Fast solute mixing can be achieved in a microchannel by rapid unidirectional displacement of a discrete liquid drop. The recirculation streamlines created within the liquid during the drop’s motion cause the solute to interlayer across the channel depth, provided the interlayer diffusion of the solute is small. Uniform interlayering appears when the drop is displaced by more than three drop len...

This paper presents a novel dielectrophoresis-based microfluidic device incorporating round hurdles within an S-shaped microchannel for continuous manipulation and separation of microparticles. Local nonuniform electric fields are generated due to the combined effects of obstacle and curvature, which in turn induce negative dielectrophoresis forces exerting on the particle that transport throug...

Microchannel plates are an important component in a type of imaging diagnostic known as an x-ray framing camera, used in x-ray radiography of high-energy-density physics experiments. A microchannel plate is responsible for detecting x rays and then converting them into amplified bursts of electrons, which are then imaged onto a phosphor-coated fiber optic screen. We present the preliminary deve...

This work aims to obtain the capacitance resulted from the coplanar electrode configuration meant to be used for underwater sensing application. Coplanar structure is proposed to overcome the complexity of parallel electrode microfabrication processes which require repeating process of layer deposition. Work is achieved through Finite Element Model (FEM) using ANSYS 12.1 and the result is compa...

The steady-state fully-developed laminar flow of non-Newtonian power-law fluids is examined in a circular microchannel with slip boundary condition and under an imposed constant wall heat flux. Effects of slip as well as the hydrodynamic and thermal key parameters on heat transfer and entropy generation are investigated. The results reveal that increasing the Brinkman number and the flow behavi...

We have inferred and verified an optical measuring technique, based on fluorescence intensity, for the species concentration field in a liquid microchannel flow. In contrast to macroscopic flows, where a light sheet is usually applied, the complete illumination of the measuring volume in the microchannel provides a heightaveraged concentration field. The technique was verified with aqueous solu...

⎯ This article presents microchannel thermal flow sensors fabricated using standard micromachining technology. The sensors comprise of a SiXNY microchannel created by etching of a poly-Si sacrificial layer. The channels are released by KOH etching through inlets and outlets etched from the backside of the substrate. Liquid flow is measured by platinum resistors deposited on top of the microchan...