ステレオリソグラフィ3Dプリントシャドウマスクを介したマイクロ電極上での指向性誘電泳泳動アセンブリと分離

Microelectrode patterning is essential in lab-on-a-chip devices, facilitating electric field localization and thereby enabling advanced particle manipulation. Conventional photolithography, while precise, is both costly and complex for electrode patterning. As a cost-effective and accessible alternative, we employed stereolithography apparatus (SLA) 3D printing to fabricate shadow masks for use in microelectrode patterning. Using these SLA 3D-printed shadow masks, we successfully patterned gold microelectrodes with complex geometries. We demonstrated that precisely localized electric fields on the micro-patterned electrodes can direct dielectrophoretic assembly and separation of colloidal particles. These experimental results are further supported by analytical calculations and numerical simulations that elucidate frequency-dependent dynamic particle behavior in electric fields. Overall, our findings confirm that SLA 3D printing offers a practical, low-cost strategy for high-resolution microelectrode fabrication, with broad applicability in lab-on-a-chip systems, including biosensing, microfluidics, and nanodevice integration.