Directing the Diffusion of a Nonmagnetic Nanosized Active Particle with External Magnetic Fields.,The Journal of Physical Chemistry B

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Directing the Diffusion of a Nonmagnetic Nanosized Active Particle with External Magnetic Fields.
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2020-08-11 , DOI: 10.1021/acs.jpcb.0c05791
Martin Kaiser ₁ , Pedro A Sánchez _{2,

3} , Nairhita Samanta ₄ , Rajarshi Chakrabarti _{4,

5} , Sofia S Kantorovich _{1,

2}

Affiliation

With the help of molecular dynamics simulations we show that an arbitrary nonmagnetic active particle with a size below one micrometer, being immersed in a suspension of magnetic nanoparticles, can diffuse faster along the direction of an applied field than perpendicular to the latter. This effect is demonstrated in monodisperse and polydisperse systems of magnetic nanoparticles for magnetic fields of moderate strength. The ability to direct a nonmagnetic active particle along the magnetic field stems from the formation of chains of magnetic nanoparticles aligned with the field direction. Such chains form effective channels through which the active particle can diffuse. We combine the investigations of the diffusion and transport efficiency of the active particle parallel and perpendicular to the field with the structural analysis of the magnetic nanoparticle system and find that the ability to direct an active particle of a given size can be maximized by changing magnetic particle concentration. The optimal transport efficiency is achieved at a concentration of magnetic material that provides a mean width of the effective tunnels that matches the effective size of the active particle.

中文翻译：

用外部磁场引导非磁性纳米尺寸活性颗粒的扩散。

借助分子动力学模拟，我们发现，尺寸小于一微米的任意非磁性活性颗粒浸入磁性纳米颗粒的悬浮液中，可以沿施加的电场方向比垂直于垂直的方向更快地扩散。在具有中等强度的磁场的磁性纳米粒子的单分散和多分散系统中证明了这种效果。沿着磁场引导非磁性活性粒子的能力源于与磁场方向对齐的磁性纳米粒子链的形成。此类链形成有效通道，活性颗粒可通过这些通道扩散。我们将对平行和垂直于电场的活性粒子的扩散和传输效率的研究与磁性纳米粒子系统的结构分析相结合，发现通过改变磁性粒子可以最大化引导给定尺寸的活性粒子的能力浓度。在磁性材料浓度达到最佳输送效率时，磁性材料的浓度应提供与活性颗粒的有效尺寸相匹配的有效通道的平均宽度。

更新日期：2020-09-18

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