随着MEMS技术和免疫磁珠技术的不断发展,平面电磁线圈作为控制纳米磁珠在微流体中运动的关键部件,受到广泛关注和研究.但其复杂的加工工艺,较低的磁珠捕获效率以及电磁线圈的热效应,限制了它在微流控芯片中的进一步发展和应用.本文介绍了一种高梯度磁场分离微流控芯片,通过在芯片内部集成顺磁性的微柱结构,形成高磁场来捕获磁珠.采用基于SU-8多层模具和PDMS铸模工艺的快速加工方法,在芯片内部制作出顺磁性的微柱阵列.在外磁场磁化作用下,这些微柱能产生磁珠捕获所需的高梯度磁场,有效的进行磁珠操控和分离,通过蛋白捕获实验验证了芯片的可行性.该方法加工简单快捷,也不会带来电磁线圈的热效应问题.
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