论文标题
金属微武器通过重力向上驶向墙壁
Metallic Microswimmers Driven up the Wall by Gravity
论文作者
论文摘要
作为一种自然和功能性的行为，各种微生物通过将重力定向和向上游动而表现出重力。在本文描述的游泳自摩托纳米运动器中，包括双金属纳米棒，优先向上向上向上向上向上游泳，沿着尾巴重时（即，当一种金属的密度大于另一种金属的密度时）。通过实验和理论，确定了两种有助于这种引力行为的机制。首先，浮力或引力扭矩作用于这些杆，以使它们向上对齐。其次，杆与倾斜壁的流体动力相互作用在杆上引起前AFT不对称性，从而增强其方向偏置并促进其向上运动。
As a natural and functional behavior, various microorganisms exhibit gravitaxis by orienting and swimming upwards against gravity. Swimming autophoretic nanomotors described herein, comprising bimetallic nanorods, preferentially orient upwards and swim up along a wall, when tail-heavy (i.e. when the density of one of the metals is larger than the other). Through experiment and theory, two mechanisms were identified that contribute to this gravitactic behavior. First, a buoyancy or gravitational torque acts on these rods to align them upwards. Second, hydrodynamic interactions of the rod with the inclined wall induce a fore-aft drag asymmetry on the rods that reinforces their orientation bias and promotes their upward motion.
