Zaben Abdelqader, Kitenbergs Guntars, Cēbers Andrejs
MMML Lab, University of Latvia, Jelgavas 3, Riga, LV-1004, Latvia.
Soft Matter. 2020 May 13;16(18):4477-4483. doi: 10.1039/d0sm00403k.
Ferromagnetic filaments in a rotating magnetic field are studied both numerically and experimentally. The filaments are made from micron-sized ferromagnetic particles linked with DNA strands. It is found that at low frequencies of the rotating field, a filament rotates synchronously with the field and beyond a critical frequency, it undergoes a transition to a three dimensional regime. In this regime the tips of the filament rotate synchronously with the field on circular trajectories in the plane parallel to the plane of the rotating field. The characteristics of this motion found numerically match the experimental data and allow us to obtain the physical properties of such filaments. We also discuss the differences in behaviour between magnetic rods and filaments and the applicability of filaments in mixing.
对旋转磁场中的铁磁细丝进行了数值和实验研究。这些细丝由与DNA链相连的微米级铁磁颗粒制成。研究发现，在旋转磁场的低频下，细丝与磁场同步旋转，超过临界频率后，它会转变为三维状态。在这种状态下，细丝的尖端在与旋转磁场平面平行的平面内，沿着圆形轨迹与磁场同步旋转。通过数值计算得到的这种运动特性与实验数据相符，使我们能够获得此类细丝的物理性质。我们还讨论了磁棒和细丝在行为上的差异以及细丝在混合中的适用性。
