Magnetic interaction of Janus magnetic particles suspended in a viscous fluid

Dynamics of a Pair of Paramagnetic Janus Particles under a Uniform Magnetic Field and Simple Shear Flow

“…The computational domain consisted of two particle surfaces ∂Γ 1 and ∂Γ 2 and particle domains Γ 1 and Γ 2 , where subscripts 1 and 2 represent Particles 1 and 2, respectively. The domains of both Janus particles were equally sectionalized into a paramagnetic side, with a constant susceptibility, and a non-magnetic side, which corresponds to an anisotropic magnetic particle, as seen in similar studies [37]. The anisotropic property of a paramagnetic Janus particle gives it a unique behavior as opposed to its isotropic counterpart.…”

“…The anisotropic property of a paramagnetic Janus particle gives it a unique behavior as opposed to its isotropic counterpart. Under a uniform magnetic field, an isotropic paramagnetic particle will not experience a magnetic angular velocity, but a Janus particle rotates until the particle direction (the normal direction to the internal interface) is parallel to the magnetic field direction [37]. Furthermore, a pair of Janus particles' initial directions can be classified by a configuration, as shown in Figure 1b, the LR-configuration, and Figure 1c, the RL-configuration.…”

“…In numerical studies, Kang et al successfully analyzed two solid paramagnetic circular particles in a quiescent flow and under a uniform magnetic field, a method that was later applied by Zhang et al to study two elliptical paramagnetic particles [19,20]. Later, Seong et al and Kim et al numerically studied anisotropic circular and elliptical particles under a uniform magnetic field using statistical analysis for their validation [37][38][39]. With many academic literature works leaning towards computer simulations, anisotropic particles in shear flows, and under a uniform magnetic field, we apply the arbitrary Lagrangian-Eulerian (ALE) algorithm for the finite element methods (FEM) and use direct numerical simulation (DNS).…”

“…While there have been experimental [4][5][6][7]9,14,18,[21][22][23] and numerical [5,9,18,[37][38][39]] investigations of microscale Janus particle dynamics, our work is the first to study the dynamics of microscale Janus particles in shear flows and under a uniform magnetic field. This can be used for applications in drug delivery, disease diagnosis, and magnetorheological fluids in dampers and pumps.…”

Influence of magnetic field on evaporation of a ferrofluid droplet

“…Such particles have also varied applications. Mathematical modelling and computational analysis of evaporating drop of Janus particles is studied by several workers [19][20][21]. Amongst all such magnetic dispersions magnetic fluid also known as ferrofluid has well established branch of science and technology.…”