Bag Poulami, Nayak Shubhadip, Debnath Tanwi, Ghosh Pulak K
Department of Chemistry, Presidency University, Kolkata700073, India.
Department of Chemistry, University of Calcutta, Kolkata700009, India.
J Phys Chem Lett. 2022 Dec 15;13(49):11413-11418. doi: 10.1021/acs.jpclett.2c03193. Epub 2022 Dec 2.
Self-propelled Janus particles exhibit autonomous motion thanks to engines of their own. However, due to the randomly changing direction of such motion they are of little use for emerging nanotechnological and biomedical applications. Here, we numerically show that the motion of chiral active Janus particles can be directed, subjecting them to a linear array of convection rolls. The rectification power of self-propulsion motion here can be made to be more than 60%, which is much larger than earlier reports. We show that rectification of a chiral Janus particle's motion leads to conspicuous segregation of dextrogyre and levogyre active particles from a binary mixture. Further, we demonstrate how efficiently the rectification effect can be exploited to separate dextrogyre and levogyre particles when their intrinsic torques are distributed with Gaussian statistics.
自驱动的 Janus 粒子借助自身的“引擎”展现出自主运动。然而，由于这种运动方向随机变化，它们在新兴的纳米技术和生物医学应用中用途不大。在此，我们通过数值模拟表明，手性活性 Janus 粒子的运动可以被引导，方法是让它们处于对流滚的线性阵列中。此处自推进运动的整流功率可以达到 60%以上，这比早期的报道要大得多。我们表明，手性 Janus 粒子运动的整流会导致右旋和左旋活性粒子从二元混合物中显著分离。此外，我们还演示了在右旋和左旋粒子的固有扭矩按高斯统计分布时，如何有效地利用整流效应来分离它们。
