Magnetic Control of Tubular Catalytic Microbots for the Transport, Assembly, and Delivery of Micro-objects
Magnetic Control of Tubular Catalytic Microbots for the Transport, Assembly, and Delivery of Micro-objects
复制标题
DOI：
10.1002/adfm.200902376
复制
发表时间：
2010-08-09
影响因子：
19
通讯作者：
Schmidt, Oliver G.
中科院分区：
文献类型：
--
作者：
Solovev, Alexander A.;Sanchez, Samuel;Schmidt, Oliver G.
近年来，人工合成的催化微纳马达在推进功率、运动控制和速度等方面都受到了极大的关注。然而，这种自行式车辆的应用只有少数几个被描述过。这里展示了可用于执行各种任务的自行式催化微管(微型机器人)的磁性控制，如选择性地装载、输送和输送流体中的微尺度物体；例如，展示了对聚苯乙烯颗粒和金属薄膜(“纳米板”)的磁性控制。微型机器人通过铂催化将过氧化氢分解为氧气和水来喷射微泡，从而实现自我推进。对燃料和表面活性剂的浓度进行了优化，当双氧水的质量分数为15%时，最大速度可达275µm S(-1)(每秒5.5个身长)。微型机器人在运输单个直径5微米的颗粒时施加约3.77pN的力；证明了高推进力，允许运输多达60个微粒。通过在卷起的微管中引入一层铁薄膜，微管的运动可以完全受到外部磁场的控制。
Recently a significant amount of attention has been paid towards the development of man-made synthetic catalytic micro- and nanomotors that can mimic biological counterparts in terms of propulsion power, motion control, and speed. However, only a few applications of such self-propelled vehicles have been described. Here the magnetic control of self-propelled catalytic Ti/Fe/Pt rolled-up microtubes (microbots) that can be used to perform various tasks such as the selective loading, transportation, and delivery of microscale objects in a fluid is shown; for instance, it is demonstrated for polystyrene particles and thin metallic films ("nanoplates"). Microbots self-propel by ejecting microbubbles via a platinum catalytic decomposition of hydrogen peroxide into oxygen and water. The fuel and surfactant concentrations are optimized obtaining a maximum speed of 275 mu m s(-1) (5.5 body lengths per second) at 15% of peroxide fuel. The microbots exert a force of around 3.77 pN when transporting a single 5 mu m diameter particle; evidencing a high propulsion power that allows for the transport of up to 60 microparticles. By the introduction of an Fe thin film into the rolled-up microtubes, their motion can be fully controlled by an external magnetic field.