Synthesis And Application Of Light-Driven Micromotors

Exercise is an important feature of life.Due to the role of biomolecular motors such as myosin,dynein and kinesin,organisms can move autonomously.Based on studies of biomolecular motors,Scientists have designed a large of artificial microdevices,micromotors are important part of artificial microdevices.The primary role of the micromotor is the device that converts other energy sources into the energy of their own motion in the micron scale,achieve device autonomous movement.Light energy,as an important source of energy,appears in people's vision that can promote micromotor movement.Many chemical energy sources produce secondary pollution in solution,the difference is that light energy is a clean energy source.In addition,the light-driven micromotor can realize precise and convenient remote control while the light is not directly contact with the micromotor.It is because of these unique advantages,the light-driven micromotor has received extensive attention.This article mainly describes the synthesis of the light-driven micromotor that use light energy as their power and their potential for application in different fields.The specific research content is mainly divided into the following three tasks:1.In this part of the work,we use urea as raw material.After high temperature calcination,and reduction with chloroplatinic acid in situ,we obtain Pt-C₃N₄ nanosheet.Final,we synthesis Pt-C₃N₄ spherical micromotor by emulsion.Due to the photocatalytic properties of Pt-C₃N₄,micromotors exhibit phototaxis in solution?micromotor moves towards the light?.At the same time,the micromotors exhibit an interesting phenomenon of group movement that will cause regular agitation in the light with the increase micromotors.Based on this group phenomenon,the potential application of motors on smart glass is proposed.we confirmed that the movement mechanism of micromotors is electrolyte diffusion by studying the influence of the environment during the micromotors movement,the micromotors exhibit an interesting phenomenon of group movement that will cause regular agitation in the light with the increase micromotors.Based on this group phenomenon,the potential application of micromotors on smart glass is proposed.2.Based on the previous work,we conducted more research.By studying the synthesis conditions of emulsions,we achieve control of the micromotor volume.The micromotors movement of different sizes in solution was studied and it was found that the micromotor speed is inversely proportional to the micromotor volume.Then,due to the mechanism by sulfhydryl groups can interact with Pt,we tried to modify the different groups on the surface of the micromotor.And studied the effect of modified groups on the motion of micromotors.We found that positively charged group modification results in a movement of the micromotor in the opposite direction,the micromotor exhibits photopathy?micromotor moving away from light?.The self-electric field produced by a micromotor is constant,Changing the surface charge of the micromotor will change the micromotor direction.We have found that as the length of the modified chain increases,the micromotor speed is decreasing.Based on previous research results,we synthesized a micromotor with different directions of motion in acid and alkaline solution.3.In the work of this section,we synthesized PPy/C₃N₄ composite micromotors by emulsion synthesis.The different components of micromotors,PPy and C₃N₄,play different roles under light.The PPy responds to infrared light and generates a photopathy motion under the infrared light,it is photothermal effect;the C₃N₄ responds to ultraviolet light and produces phototaxis motion under the ultraviolet light,it is the result of electrolyte diffusion.Different movements under different light sources.Because of its good electrical properties,PPy has potential applications in circuit repair.