动态磁场场控制下交换偏置帽Janus粒子的平移和旋转运动
Translatory and rotatory motion of Exchange-Bias capped Janus particles controlled by dynamic magnetic field landscapes
摘要：
磁性Janus粒子（MJPs），通过覆盖一个非磁性的球形粒子与半球形的磁性面内交换偏置层系统帽，显示洋葱磁化状态的几个微米的大直径。在这项工作中，这些MJPs的运动特性将被调查时，他们被引导的磁场景观在原型平行条纹域，动态变化的叠加外部磁场脉冲序列，在水介质中。我们证明，由于工程磁化状态的半球帽，一个快速，定向粒子传输和粒子旋转可以诱导。此外，通过修改所施加的脉冲序列的频率和各个场分量的强度，我们观察到这两种类型的运动的组合或单独发生之间的可能分离。我们的研究结果对芯片实验室系统具有重要意义，其中通过分析物桥将颗粒固定在表面上用于低浓度分析物检测，并且在基板的限定位置上的颗粒旋转可以显著增加固定（并且因此分析物检测）概率。
英文摘要：
Magnetic Janus particles (MJPs), fabricated by covering a non-magnetic spherical particle with a hemispherical magnetic in-plane exchange-bias layer system cap, display an onion magnetization state for comparably large diameters of a few microns. In this work, the motion characteristics of these MJPs will be investigated when they are steered by a magnetic field landscape over prototypical parallel-stripe domains, dynamically varied by superposed external magnetic field pulse sequences, in an aqueous medium. We demonstrate, that due to the engineered magnetization state in the hemispherical cap, a comparably fast, directed particle transport and particle rotation can be induced. Additionally, by modifying the frequency of the applied pulse sequence and the strengths of the individual field components, we observe a possible separation between a combined or an individual occurrence of these two types of motion. Our findings bear importance for lab-on-a-chip systems, where particle immobilization on a surface via analyte bridges shall be used for low concentration analyte detection and a particle rotation over a defined position of a substrate may dramatically increase the immobilization (and therefore analyte detection) probability.
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