Utilizing yield-stress fluids to suppress chaining during magnetic alignment of microdisks via rotating fields
Utilizing yield-stress fluids to suppress chaining during magnetic alignment of microdisks via rotating fields
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利用屈服应力流体通过旋转场抑制微盘磁对准过程中的链接
DOI：
10.1002/aic.16215
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Walker, Travis W.
中科院分区：
文献类型：
--
作者：
Tan, Mingyang;Lambert, Adam L.;Swann, Britany M.;Song, Han;Dhagat, Pallavi;Jander, Albrecht;Walker, Travis W.
喷墨印刷可用于存款可光聚合的磁性油墨以产生功能化复合材料。当喷墨印刷与外部磁场相结合以排列磁性取向颗粒（MOPs）时，可以实现复合材料的各向异性。当MOP被外部磁场感应时，它会产生自己的磁场，可以吸引相邻的粒子。在某些领域，如高频应用中，颗粒粗化为链和片等高阶结构是不需要的。我们表明，这种颗粒-颗粒的吸引力和随后的颗粒迁移可以被抑制与引入的屈服应力到悬浮介质中，同时仍然允许的颗粒进行对齐。对于旋转磁场中扁球体的磁感应旋转和平移运动，给出了线性流体中特征时间尺度和屈服应力流体中特征应力的理论标度。© 2018美国化学工程师学会AIChE J，64：3215-3226，2018
Inkjet printing can be used to deposit photopolymerizable magnetic inks for the creation of functionalized composites. Anisotropic properties in the composites can be achieved when inkjet printing is combined with external magnetic fields to align magnetically orientable particles (MOPs). When a MOP is induced by an external magnetic field, it will create its own magnetic field that can attract neighboring particles. The coarsening of particles into higher‐order structures like chains and sheets is unwanted in certain areas, such as high‐frequency applications. We show that this particle–particle attraction and subsequent particle migration can be inhibited with the introduction of a yield stress into the suspending medium, while still allowing the alignment of the particle to proceed. For magnetically induced rotational and translational motions for oblate spheroids in a rotating magnetic field, theoretical scalings are presented for the characteristic timescales in a linear fluid and for the characteristic stresses in a yield‐stress fluid. © 2018 American Institute of Chemical EngineersAIChE J, 64: 3215–3226, 2018