ROBUST LOW-COST PDMS PERISTALTIC MICROPUMP WITH MAGNETIC DRIVE




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A ROBUST LOW COST PDMS PERISTALTIC MICROPUMP WITH MAGNETIC DRIVE Eleanor Kai1 Tingrui Pan1 2 and Babak Ziaie1 2 Department of Electrical and Computer Engineering 2 Department of Biomedical Engineering University of Minnesota Minneapolis MN 55414 1 the bottom one incorporates the microchannel while the middle layer houses three small permanent magnets loaded in small reservoirs separated from the microchannels by a thin PDMS layer membrane Finally a top flat sheet covers the magnets and seals the middle layer Positioning another set of three magnets at different phase angles on the rotor of a small DC motor creates the serial membrane actuation needed for a peristaltic pump The polarity of adjacent magnets in the reservoir is reversed in order to prevent simultaneous actuation of two neighboring magnets By varying the rotation speed the flow rate can be easily adjusted The micropump has a small power consumption 20 mW mainly determined by the power requirements of the small DC motor ABSTRACT In this paper we present a low cost PDMS peristaltic micropump with magnetic drive The fabrication process is based on soft molding and bonding of three PDMS layers A base layer incorporates the microchannels while a middle actuating layer houses three miniature permanent magnets covered by a top flat layer A small DC motor 6mm in diameter and 15mm in length with three permanent magnets NdFeB stagger mounted on its shaft is used to pull down and actuate the membrane mounted magnets A maximum flow rate of about 24 L min at the speed of 4000rpm with power consumption of 14mW was demonstrated Keywords Magnetic Drive Microfluidics Micropump Peristaltic Pump PDMS Soft Lithography INTRODUCTION Micropumps play an important role in a wide variety of chemical and biological microsystems such as drug delivery and microfluidic devices Over the past decade several different micropump designs have been developed These include electroosmotic nozzle diffuser positive displacement and






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