In this work, an NdFeB isotropic magnetic powder - polydimethylsiloxane (PDMS) composite is used as the magnetic flux source for the MHD pump. MHD pumps can only pump conductive fluids. While liquid metals such as mercury or gallium can be used as the conductive fluid, for most commercial applications saline fluids, such as blood, urine or sea water serve as the conductive medium. During the functioning of a saline fluid MHD pump, chlorine gas is evolved at the anode, which results in corrosion. Thus, cheaper metals such as copper and aluminum cannot be used as electrodes in such pumps. Electrodes made up of noble metals such as Gold and Platinum have been used, but they drive up the system cost and also need specialized fabrication processes for adequate sidewall coverage. Herein, CO2laser printing is used to convert the insulator polyimide (PI) to conductive graphene and this material is used as the electrode. A polyimide precursor is spun coated on a silicon wafer and thermally cured to form an 8 μm thick polyimide film. Selective printing of the CO2laser across the surface of the PI film with a speed of 92 mm/s and power of 3 W forms the laser induced graphene (LIG) electrodes.
|Original language||English (US)|
|Title of host publication||2017 IEEE International Magnetics Conference (INTERMAG)|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|State||Published - Apr 2017|