AI 中文总结
本研究开发了一种基于PCB技术的新型磁平台，通过在Kapton基底上电沉积CoPt微磁体实现不同磁场梯度，经退火优化后剩磁显著提升，实验验证其可有效捕获微流控通道中的磁性纳米颗粒，结果与COMSOL模型高度吻合。
AI 中文摘要
将磁性材料与可扩展微流控平台集成，可显著提升生物技术流程的通量与精度。本研究开发了一种基于印刷电路板（PCB）技术的新型磁平台，在Kapton基底的铜焊盘上电沉积钴铂（CoPt）微磁体，其 footprint 可任意设计，以产生不同的磁场梯度。通过X射线衍射（XRD）和振动样品磁强计（VSM）对磁体进行退火前后的表征，结果显示：600℃退火后XRD出现有序L10相，VSM测得面内剩磁从0.24T提升至1.4T，增幅约6倍；能量色散X射线谱（EDX）观测确认Co与Pt的原子比接近等原子比。通过在微流控通道中捕获磁性纳米颗粒，实验验证了这些磁体的性能，结果与COMSOL Multiphysics有限元分析（FEA）模型高度吻合。
英文摘要
Integration of magnetic material with scalable microfluidic platforms can significantly improve the throughput and precision in biotechnology processes. In this work we have developed a new magnetic platform based on printed circuit board (PCB) technology. Cobalt-Platinum (CoPt) micromagnets are electroplated on copper pads with an arbitrary footprint on a Kapton substrate to enable generation of different magnetic field gradients. The magnets are characterized by XRD and VSM, before and after thermal annealing. The ordered L10 phase appear in XRD results after annealing at 600 °C, and VSM results show around six times increase for in-plane magnetic remanence from 0.24T to 1.4T. The near equiatomic ratios of Co:Pt is confirmed by EDX observations. The performance of these magnets is experimentally validated by trapping magnetic nanoparticles in microfluidic channels. These results are in excellent agreement with FEA models presented in COMSOL Multiphysics.
