Dpt. de Física UIB i Institut d'Aplicacions Computacionals de Codi Comunitari (IAC3), Campus UIB, E-07122 Palma de Mallorca, Spain.
Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia.
Soft Matter. 2019 Nov 28;15(44):8982-8991. doi: 10.1039/c9sm01285k. Epub 2019 Sep 17.
In the present work magnetic brushes under flow conditions and confined inside narrow slits have been studied using Langevin dynamics simulations. It has been observed that the structural properties of these confined magnetic brushes can be tuned via the application of an external magnetic field, and this control can be exerted with a relatively low content of magnetic colloidal particles in the filaments that form the brushes (20% in the present study). The potential of these brushes to perform a separation process of a size-bidispersed mixture of free non-magnetic colloidal particles flowing through the slit has also been explored. Numerical results show that it is possible to induce a two-fold effect on the bidispersed particle flow: a lateral separation of the two types of flowing colloidal particles and an enhancement of the differences in their velocities. These two features are key elements sought in separation processes and could be very relevant in the design of new chromatographic columns and microfluid separation devices.
在本工作中，使用朗之万动力学模拟研究了流动条件下和限制在狭窄狭缝内的磁性刷。已经观察到，这些受限磁性刷的结构特性可以通过施加外部磁场进行调节，并且这种控制可以在形成刷子的纤维中用相对低含量的磁性胶体颗粒施加（本研究中为 20％）。还探索了这些刷子在通过狭缝流动的大小双分散自由非磁性胶体颗粒混合物的分离过程中执行的可能性。数值结果表明，有可能对双分散颗粒流产生双重影响：两种类型的流动胶体颗粒的横向分离以及它们的速度差异的增强。这两个特征是分离过程中寻求的关键要素，并且在新的色谱柱和微流分离装置的设计中可能非常重要。
