Development of an assembly-free fabrication process for microsystems driven by distributed actuators on a chip

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Composite material made of magnetic nanoparticles/SU-8 is expected to be a material of microactuators which can be controlled by external magnetizing field and easily fabricated by only photolithography. In this study, we evaluated the dispersivity of the proposed nanocomposites mixed by a planetary and an ultrasonic stirrers. As a result, the planetary stirrer achieves higher dispersivity than the ultrasonic one. Moreover, we propose assembly-free integration method for driving elements internally fabricated by infusing liquid nanocomposite and sacrificial resist into a microchannel before exposing. By a magnetic driving test in the microchannel, it is confirmed that the fabricated element made of the proposed nanocomposite moved with the external magnetic field applied by an electromagnet.