Use of paired, bonded NdFeB magnets in redox magnetohydrodynamics
Use of paired, bonded NdFeB magnets in redox magnetohydrodynamics
复制标题
DOI：
10.1021/ac048849b
复制
发表时间：
2005-02-15
影响因子：
7.4
通讯作者：
Fritsch, I
中科院分区：
文献类型：
--
作者：
Arumugam, PU;Clark, EA;Fritsch, I
粘结钕铁硼（NdFeB）永磁体的配对配置，成功地用于控制质量输运的氧化还原为基础的，磁流体动力学（MHD）。基于磁场的流体流动控制具有用于便携式芯片实验室（LOAC）和分析设备的潜力。粘结磁体由磁粉和有机粘结剂材料组成，比电磁体和烧结永磁体更便宜，更容易制造和图案化，这些磁体以前曾用于电化学系统的MHD研究。在电极附近和周围图案化粘结磁体的能力预期允许更好地控制磁场分布和溶液流动。在0.06 M硝基苯和0.5 M六氟磷酸四正丁基铵的乙腈溶液中，在800 μ m半径的铂盘电极上产生电流。在存在磁场的情况下，极限电流增加，这表明对于烧结陶瓷，质量传输增强。（210 +/-4%，N = 4，其中B-r= 1.23 T，磁场强度为0.55 T）并结合（94 +/-8%，N = 4，其中B-r = 0.41 T且磁场强度为0.20 T）磁体的磁场强度与使用具有相同磁通量密度的电磁体获得的磁场强度相似。在控制流体流动方面，重要的是磁场强度而不是磁体类型，这对于将粘结永磁体集成到LOAC装置中是有利的。
Bonded neodymium-iron-boron (NdFeB) permanent magnets in a paired configuration were successfully used to control mass transport in redox-based, magnetohydrodynamics (MHD). Control of fluid flow based on magnetic fields has potential for use in portable lab-on-a-chip (LOAC) and analytical devices. Bonded magnets, composed of magnetic powder and organic binder materials, are less expensive and easier to fabricate and pattern than electromagnets and sintered permanent magnets, which have been previously used in MHD studies on electrochemical systems. The ability to pattern bonded magnets near and around the electrodes is expected to allow for better control over the magnetic field distribution and solution flow. Current was generated at an 800-mum-radius platinum disk electrode in a solution of 0.06 M nitrobenzene and 0.5 M tetra-n-butylammonium hexafluorophosphate in acetonitrile. Increases in limiting current in the presence of the magnetic field, which indicate enhancement in mass transport, for sintered (210 +/- 4%, N = 4, where B-r= 1.23 T and magnetic field strength is 0.55 T) and bonded (94 +/- 8%, N = 4, where B-r = 0.41 T and magnetic field strength is 0.20 T) magnets, were similar to those obtained using an electromagnet with the same magnetic flux densities. The magnetic field strength and not the magnet type is important in controlling fluid flow, which is encouraging for integration of bonded permanent magnets into LOAC devices.