Micro & Bio Fluidics, Lab-on-Chip – Page 34

Superhydrophobic Nanowire Surfaces for Drop Movement Using Magnetic Fields

Egatz-Gomez A., Melle S., García A.A., Lindsay S., Rubio M.A., Domínguez P., Picraux T., Taraci J., Clement T., Hayes M., Gust D., Arizona State University, US

We present a novel method to control water drop movement on superhydrophobic surfaces through magnetic fields. Water drops with paramagnetic particles can be moved on fractal Si-nanowire superhydrophobic surfaces at high speeds by displacing a [...]

On the Motion of a Bubble through Microchannel Contractions

Chio H., Jensen M.J., Wang X., Bruus H., Attinger D., Columbia University, US

We present the first transient pressure measurements and high-speed visualizations of a gas bubble passing through liquid-filled microchannel contractions. Results are compared with a simple theoretical model taking into account the Young-Laplace pressure drop, the [...]

Simulation of filling of microfluidic devices using a coarse-grained continuum contact angle model

Narayanan C., Lakehal D., ASCOMP, CH

We present a new dynamic contact angle model applied to the fillingproblem in microfluidic devices. The level-set method is used forinterface capture. Several attempts have been made in the past decades to model contact--line dynamics [...]

Blood dynamics in microfabricated vessel networks

Mulivor A.W., Shevkoplyas S., Sun C., Bitensky M.W., Munn L.L., Massachusetts General Hospital, US

Blood displays interesting behavior when flowing through channels with dimensions similar to the blood cells. Two well-known examples include the decrease in flow resistance with tube size (Fahraeus-Lindqvist effect) and the enhancement of leukocyte (WBC) [...]

Combination Ultrasonic- Dielectrophoretic Particle Traps for Particle Trapping and Sample Purification in a Microfluidic Channel

Marina O., Ward M.D., Kaduchak G., Los Alamos National Laboratory, US

Ultrasonic and dielectrophoretic particle manipulation has been studied for particle trajectory modification and particle trapping in microfluidic channels. We report a new approach of a combination of dielectrophoresis (DEP) and ultrasonic fields to trap and [...]

Whole Blood Pumped by Laser Driven Micropump

Ussing T., Petersen L.V., Krühne U., Højslet L., FluimediX, DK

A novel laser driven peristaltic micro-pump for the manipulation of fluids in a micro system has been explored and validated on whole blood in saline solution. The pump is based on laser-induced film-boiling of the [...]

A Lab-on-a-Chip using Magnetic Droplets

Lehmann U., Parashar V.K., Vandevyver C., Gijs M.A.M., EPFL, CH

We present a chip-based bio-analysis system using the two dimensional (2D) magnetic manipulation of microdroplets. The latter contain magnetic microparticles which serve as force mediators for the droplet actuation. In combination with a changeable field [...]

Micro & Nano Fluidics

A Droplet Microarray for Homogeneous Enzymatic Assay

Balakirev M., Mugherli L., Chatelain F., CEA-Grenoble, FR

This work describes a droplet microarray for monitoring of enzymatic activity on a glass slide. These array are composed of features defined and separated by differential surface tension (surface tension array). A photolithographic method was [...]

Nanofluidic Size Exclusion Chromatograph for In Site Macromolecular analyses

Choi D., Grunthaner F., Feldman S., Svehla D., Jet Propulsion Laboratory/California Institute of Technology, US

We are developing a nanofluidic size exclusion chromatograph (nano-SEC) system that can be incorporated into miniature lab-on-a-chip devices which will provide detailed information on the geochemical and biological history of soil, ice, and water samples [...]