论文标题
可控毛细管组装的磁性椭圆形Janus颗粒成可调环，链条和六角形晶格
Controllable Capillary Assembly of Magnetic Ellipsoidal Janus Particles into Tunable Rings, Chains and Hexagonal Lattices
论文作者
论文摘要
流体界面处的胶体组件具有巨大的新型结构化材料制造的巨大潜力。但是，在将粒子的可控和可调组装成各种结构中仍然存在。在此，我们报告了流体流体界面处的磁性椭圆形Janus颗粒的毛细管组件。根据其倾斜角，即粒子主轴与流体界面形成的角度，这些颗粒变形了界面并产生毛细管偶极子或己糖。在毛细管相互作用的驱动下，多个颗粒因此组装成链，六边形晶格和环状结构，可以通过施加外部磁场来积极控制。我们预测了一个野外强度相图，其中各种结构以稳定状态存在。由于组装结构的多样性，可控性和可调节性，因此流体界面处的磁性椭圆形Janus颗粒可以用作新型材料的多功能构建块。
Colloidal assembly at fluid interfaces has a great potential for the bottom-up fabrication of novel structured materials. However, challenges remain in realizing controllable and tunable assembly of particles into diverse structures. Herein, we report the capillary assembly of magnetic ellipsoidal Janus particles at a fluid-fluid interface. Depending on their tilt angle, i.e. the angle the particle main axis forms with the fluid interface, these particles deform the interface and generate capillary dipoles or hexapoles. Driven by capillary interactions, multiple particles thus assemble into chain-, hexagonal lattice- and ring-like structures, which can be actively controlled by applying an external magnetic field. We predict a field-strength phase diagram in which various structures are present as stable states. Owing to the diversity, controllability, and tunability of assembled structures, magnetic ellipsoidal Janus particles at fluid interfaces could therefore serve as versatile building blocks for novel materials.
