亚微米尿素酶马达的光电推进对催化剂包覆颗粒比例的依赖性
Dependence of Phoretic Propulsion of Sub-Micron Urease Motors on the Fraction of the Particle Covered by Catalyst
摘要：
微/纳米马达是能够在流体系统中运动的微至纳米尺寸的颗粒和系统。它们的运动可能是许多机制的结果，其中最著名的一种是电解质扩散电泳，其中带电离子在颗粒表面的不对称产生导致电泳。这项工作的重点是构建尿素酶马达，仔细控制其Janus平衡，即，以控制被酶覆盖的表面的百分比，并研究这种不对称性对颗粒推进速度的影响。在这方面，我们成功地构建了具有不同涂层百分比的颗粒。观察结果表明，当涂层百分比接近50%时，颗粒的推进速度稳定增加。在达到一定的酶活性阈值和百分比覆盖率后，在较低的催化帽高度下，这种趋势可能会逆转。然而，所使用的方法在构造具有较低催化帽高度的发动机方面具有局限性。我们的目标是阐明高效的尿素酶驱动的泳动马达的设计原理，这可能对下一代纳米级器件的发展产生重大影响。
英文摘要：
Micro/Nano motors are micro to nano-sized particles and systems that are capable of motion in fluidic systems. Their motion can be a result of many mechanisms, one of the most well-known of which is electrolyte diffusiophoresis, in which asymmetric production of charged ions across the surface of the particle leads to phoresis. The focus of this work is to construct Urease motors with careful control of their Janus balance, i.e., to control the percentage of surface covered with the enzyme and study the effect of this asymmetry on the propulsion velocity of the particles. In that regard, we were successful in constructing particles with varied coating percentages. The observation made was that as the percentage coating approaches 50%, the propulsion velocity of the particle increases steadily. The trend may reverse at lower catalytic cap heights after reaching a certain threshold of enzyme activity and per cent coverage. However, the method used had limitations in constructing motors with lower catalytic cap heights. We aim to shed light on the design principles of efficient urease-driven phoretic motors, which could have significant implications for the development of next-generation nanoscale devices.
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