Xie Qingguang, Davies Gary B, Günther Florian, Harting Jens
Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, NL-5600MB Eindhoven, The Netherlands.
Soft Matter. 2015 May 14;11(18):3581-8. doi: 10.1039/c5sm00255a.
Janus particles have attracted significant interest as building blocks for complex materials in recent years. Furthermore, capillary interactions have been identified as a promising tool for directed self-assembly of particles at fluid-fluid interfaces. In this paper, we develop theoretical models describing the behaviour of magnetic Janus particles adsorbed at fluid-fluid interfaces interacting with an external magnetic field. Using numerical simulations, we test the models predictions and show that the magnetic Janus particles deform the interface in a dipolar manner. We suggest how to utilise the resulting dipolar capillary interactions to assemble particles at a fluid-fluid interface, and further demonstrate that the strength of these interactions can be tuned by altering the external field strength, opening up the possibility to create novel, reconfigurable materials.
近年来，Janus粒子作为复杂材料的构建单元引起了广泛关注。此外，毛细相互作用已被视为在流体-流体界面进行粒子定向自组装的一种有前景的工具。在本文中，我们建立了理论模型来描述吸附在流体-流体界面的磁性Janus粒子在外部磁场作用下的行为。通过数值模拟，我们验证了模型的预测结果，并表明磁性Janus粒子以偶极方式使界面发生变形。我们提出了如何利用由此产生的偶极毛细相互作用在流体-流体界面组装粒子，并进一步证明了这些相互作用的强度可以通过改变外部场强来调节，从而为创造新型的、可重构的材料开辟了可能性。
