Here is the abstract you requested from the DPC_2007_Biomedical technical program page. This is the original abstract submitted by the author. Any changes to the technical content of the final manuscript published by IMAPS or the presentation that is given during the event is done by the author, not IMAPS.
|Inclined Angle Optical Lithography Micro-Structures for Improved Micro-Mixing|
|Keywords: Biomedical, Lithography , Micro-Mixing|
|Rapid, high efficiency mixing of fluidic species at the micro-scale is essential for several microfluidic applications such as clinical diagnostics, DNA hybridization, and PCR amplification. Mixing of fluids in MEMS structures/channels on bio-chip devices is difficult due to the natural laminar flow of such fluids at the micro-scale. In this paper, we report the development of a high efficiency magnetic microfluidic mixer based on a novel 3D impellor-shaped ferromagnetic micro-stirrer bar. The 3D impellor-shaped micro-stirrer bar with 31.6ƒ¡ inclined angle is fabricated using titled (55ƒ¡) SU-8 exposure technique. The 3-D inclined micro-stirrer bar causes 3-D perturbation of fluids (Lagrangian chaos) resulting in rapid mixing in micro-scale. When compared with a vertical straight sidewall micro-stirrer bar, approximately 20% of mixing efficiency enhancement is achieved.|
|Dr. Donald J. Hayes , President
MicroFab Technologies, Inc.