Design and Fabrication of Microchannels for Magnetohydrodynamic Flow

This paper introduces a new microchannel design for magnetohydrodynamic (MHD) flow that maximizes MHD pumping power. An electromagnetic channel (EMC), which has a rectangular cross-section and electrodes that run the full length of the channels, is the key design element. EMC fabrication on Si requires a two-mask process. ICP-RIE was employed to open rectangular grooves, and then an insulation layer and a seed layer for electroplating were sputtered into these grooves. Current densities for electroplating were adjusted to obtain as planar surface as possible. However, a polishing process needed to be developed to achieve the required planarity for subsequent bonding. Profilometry showed that the surface roughness after polishing was less than 200nm, which was adequate for bonding. The conditions for the second ICP-RIE step, which opened a 10 µm wide channel between the electrodes, were adjusted to protect the electrodes. Finally, HF bonding was employed to bond the wafer to an O211 g...

• Type: Conference
• Year: 2003
• Where: ICMENS
• Authors: Jian-Bin Bao, D. Jed Harrison
• Keywords: ICMENS 2003, Key Design Element, MHD Pumping Power, Rectangular Grooves