Department of Biomedical Sciences and Biomedical Engineering, School of Biological Sciences, University of Reading, Reading, UK.
School of Life Sciences, University of Warwick, Coventry, UK.
Sci Rep. 2023 Jan 24;13(1):1340. doi: 10.1038/s41598-023-27639-8.
Taxis is ubiquitous in biological and physical chemistry systems as a response to various external stimulations. We prepared aqueous droplets containing Belousov-Zhabotinsky (BZ) solutions suspended on an oleic acid oil phase subject to DC electric field and found that these BZ droplets undergo chemically driven translational motion towards the negative electrode under DC electric field. This electrotaxis phenomenon originates from the field-induced inhomogeneous distribution of reactants, in particular Br[Formula: see text] ions, and consequently the biased location of the leading centers towards the positive electrode. We define the 'leading center' (LC) as a specific location within the droplet where the BZ chemical wave (target pattern) is initiated. The chemical wave generated from the LC propagates passing the droplet center of mass and creates a gradient of interfacial tension when reaching the droplet-oil interface on the other side, resulting in a momentum exchange between the droplet and oil phases which drives the droplet motion in the direction of the electric field. A greater electric field strength renders a more substantial electrotaxis effect.
在生物和物理化学系统中,电迁移是一种普遍存在的现象,它是对各种外部刺激的响应。我们制备了含有 Belousov-Zhabotinsky(BZ)溶液的水相液滴,悬浮在油酸油相中,并施加直流电场,发现这些 BZ 液滴在直流电场下会发生化学驱动的平移运动,朝着负极移动。这种电迁移现象源于电场诱导的反应物(特别是 Br[Formula: see text]离子)不均匀分布,从而导致引发中心偏向正极的偏置位置。我们将“引发中心”(LC)定义为液滴内引发 BZ 化学波(目标图案)的特定位置。从 LC 产生的化学波传播穿过液滴质心,并在到达另一侧的液-油界面时产生界面张力梯度,从而在液滴和油相之间产生动量交换,驱动液滴朝着电场方向运动。更强的电场强度会产生更大的电迁移效应。
J Phys Chem Lett. 2016-9-1
Phys Rev E. 2022-12
Eur Phys J Spec Top. 2016-2
ACS Nano. 2023-6-13
Acc Chem Res. 2011-12-28
Front Cell Dev Biol. 2023-10-31
Sci Rep. 2021-2-2
Front Comput Neurosci. 2020-9-15
Proc Natl Acad Sci U S A. 2017-5-16
Langmuir. 2014-10-14
Phys Rev E Stat Nonlin Soft Matter Phys. 2011-7