LI Shouli, YANG Chenglin, YUAN Yue, GUAN Jianguo, LUO Ming

(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China)

Abstract: Herein, we fabricated the Janus magnetic microspheres (MMPs) by asymmetrically sputtering a thin Au layer on the MMPs. Then, the urease molecules were immobilized on the Au surface by using cysteamine and glutaraldehyde (GA) as linker molecules. Scan electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and optical microscope were used to characterize the structure, component and motion behaviors of the as-obtained enzyme-powered urease-Au-MMP Janus motors. The results show that the as-obtained enzyme-powered urease-Au-MMP Janus motors have a Janus structure and the surface of the Au side is rough. The C and Fe elements are evenly distributed on the whole sphere, while the Au element is only distributed on the hemisphere of the enzyme-powered urease-Au-MMP Janus motor. The ureases are asymmetrically modified on the hemisphere of the enzyme-powered urease-Au-MMP Janus motor. The velocity of the enzyme-powered urease-Au-MMP Janus motors can be enhanced effectively with the increase of the urea concentration. When the concentration of urea reaches at 10 mmol/L, the velocity of the enzyme-powered urease-Au-MMP Janus motors can be increased to 3.75 μm/s. In addition, the motor is made from magnetic microspheres, so the direction of motion of the motor can be precisely controlled by an external magnetic field.

Keywords: enzyme-powered micromotor; self-propulsion; motion control

中图分类号：TB34                               文献标志码：A

文章编号：1008-5548(2019)04-0033-08

DOI:10.13732/j.issn.1008-5548.2019.04.005

收稿日期： 2019-02-19，修回日期：2019-03-06，在线出版时间：2019-04-24 09:49。

基金项目：国家自然科学基金项目，编号：21705123。

第一作者简介：李守丽(1993—)，女，硕士研究生，研究方向为微纳米马达。E-mail：lslshelley@whut.edu.cn。

通信作者简介：罗明(1987—)，男，博士，副研究员，硕士生导师，研究方向为微纳米马达。E-mail：luoming_2016@whut.edu.cn。