Abstract
Trapping and manipulation of cells are essential operations in numerous studies in biology and life sciences. We discuss the realization of a Lab-on-a-Chip platform for dielectrophoretic trapping and repositioning of cells and microorganisms on a complementary metal oxide semiconductor (CMOS) technology, which we define here as Lab-on-CMOS (LoC). The LoC platform is based on dielectrophoresis (DEP) which is the force experienced by any dielectric particle including biological entities in non-uniform AC electrical field. DEP force depends on the permittivity of the cells, its size and shape and also on the permittivity of the medium and therefore it enables selective targeting of cells based on their phenotype. In this paper, we address an important matter that of electrode design for DEP for which we propose a three-dimensional (3D) octapole geometry to create highly confined electric fields for trapping and manipulation of cells. Conventional DEP-based platforms are implemented stand-alone on glass, silicon or polymers connected to external infrastructure for electronics and optics, making it bulky and expensive. In this paper, the use of CMOS as a platform provides a pathway to truly miniaturized lab-on-CMOS or LoC platform, where DEP electrodes are designed using built-in multiple metal layers of the CMOS process for effective trapping of cells, with built-in electronics for in-situ impedance monitoring of the cell position. We present electromagnetic simulation results of DEP force for this unique 3D octapole geometry on CMOS. Experimental results with yeast cells validate the design. These preliminary results indicate the promise of using CMOS technology for truly compact miniaturized lab-on-chip platform for cell biotechnology applications.
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Park, K., Kabiri, S. & Sonkusale, S. Dielectrophoretic lab-on-CMOS platform for trapping and manipulation of cells. Biomed Microdevices 18, 6 (2016). https://doi.org/10.1007/s10544-016-0030-x
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DOI: https://doi.org/10.1007/s10544-016-0030-x