Preparation and Properties of Self-propelled Manganese Dioxide Nanomotor
HUANG Qiuyue1,2, ZHANG Yaru1,2, LI Jiaxian1,2, SHI Xiaoxiao1,2, MIAO Weimin2,3, WU Jiasi2,4, DU Jinzhi1,2,5,6
1 School of Medicine, South China University of Technology, Guangzhou 510006, China; 2 Institutes for Life Sciences, South China University of Technology, Guangzhou 510006, China; 3 School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China; 4 School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou 510006, China; 5 National Engineering Research Center for Tissue Restoration and Reconstruction, South China University of Technology, Guangzhou 510006, China; 6 Key Laboratory of Biomedical Engineering of Guangdong Province, Key Laboratory of Biomedical Material and Engineering of Ministry of Education, Innovation Center for Tissue Restoration and Reconstruction, South China
Abstract: University of Technology, Guangzhou 510006, ChinaIn recent years, the research on micro-/nanomotor has aroused extensive interest, but micron motors account for the majority and the preparation of nanomotors is more challenging. In this study, a kind of micro-/nanomotor system with simple preparation method, wide source of raw materials, and precise size control in the nanometer to micron scale is introduced. We first synthesized size controlled SiO2 nanoparticles. Micron-sized colloidosomes were prepared by Pickering emulsion, which is formed by paraffin wax and water at high temperature. The exposed SiO2 further catalyzed the reduction of potassium permanganate (KMnO4) to produce manganese dioxide (MnO2)/SiO2 Janus nanoparticles, and the MnO2 catalyzed the decomposition of hydrogen peroxide (H2O2) to produce oxygen, thus propelling the motor. We used dynamic light scattering (DLS) and transmission electron microscopy (TEM) to characterize the size of SiO2 template, which can be controlled from 140 nm (SS1) to 630 nm (SS5). The distribution of SS1 on the surface of colloidosomes was observed by scanning electron microscope (SEM), and the influence of the paraffin/SS1 mass ratio on the surface distribution of colloidosomes was studied. The results showed that when the mass ratio of the two reached 40∶1, SS1 could be distributed in a single layer on the surface of paraffin, and part of it was embedded in the paraffin. The Janus structure of the self-propelled MnO2 nanomotor was confirmed by ultraviolet (UV) spectrum, DLS and TEM. The motion analysis was carried out by using the inverted microscope and software such as Image J and MATLAB, it was found that the mean square displacement of SS5 nanomotor in 0.5% H2O2 solution was much longer than that in ultrapure water. Moreover, the diffusion coefficient increased from 0.56 μm2/s to 1.26 μm2/s, an increase of 1.25 times, which confirmed the effective motion of the self-propelled MnO2 nanomotor.
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2020, Vol. 34 
