A study on the novel type of ferrofluid magnetic pipette

摘要

This study was performed to design the novel type of ferrofluid magnetic pipette on a micro scale for the purpose of applications to delivery systems, which is the core device of Lab on a chip in medicine and biology. The proposed ferrofluid magnetic pipette in this paper has been designed for precisely actuating and fast pipetting in submicronliter range. The magnetic dipole in ferrofluids line up with the applied field due to the permanent magnet with surface gauss 3400. The device was fabricated by MEMS technology with silicon wafer. The stepping motor with 20 steps was used as a control of pipetting. One step makes the permanent magnet move 18° in the circumferential direction and samples the liquid in nanoliter level. Of all things, it is a significant point that the possibility that a pipette for sampling the liquid can be integrated in lab on a chip is presented.