Preparation And Motion Study Of Light-driven Colloidal Motor Based On Silver And Silver Chloride

Micro-nano motors are a class of artificially synthesized machines.They can convert various external energies?including light,electricity,magnetism,heat,chemical energy,etc.?into rotation,flipping,shuttle,contraction,and other forms of motion.Nowadays,with the development of nanotechnology,the research of micro-nano motors has become an emerging multidisciplinary field.Scholars at home and abroad have made significant progress in chemically driven micro-nano motors,externally driven micro-nano motors,and hybrid-driven micro-nano motors.However,chemically driven micro-nano motors have shortcomings such as low speed,simple driving environment and high toxicity.In addition,the micro-nano motor's driving mechanism,motion speed,targeted control,and biocompatibility cannot meet the requreiment of applications in areas such as biomedicine,nano-assembly,environmental remediation and particle enrichment.Based on the above discussion and previous research results,this dissertation attempts to develop a micro-nano motor driven by ultraviolet light,and to study the influence of its material composition and structure on its motion characteristics.First,silver chloride film was prepared at various concentration of reactants,reaction time and reaction temperature,and its morphology was characterized.By comparing the grain size,film thickness and peak intensity of the phase diffraction of the prepared films under various reaction conditions,possible reasons for the changes of the morphology of the films were investigated.Based on this,microspheres half coated with silver chloride were prepared at the same reaction conditions,and the dynamics of the micro-nano motor was studied.By comparing the peak speed and half-life of the motors prepared at different conditions,we found that the duration of the reaction time to prepare the motor affected the amount of AgCl crystals,the thickness of the surface crystal layer and the pores,thereby affecting the half-life of motor motion.The reaction temperature also affected the thickness of the film,which increased the asymmetry of the Janus motor,changing the peak speed and half-life of the motor motion.Finally,changing the concentration of the reactants?mainly FeCl₃ and PVP?also affected the content of AgCl crystals,the size of the grain size,the thickness of the surface layer,and the porosity of the surface layer crystals,thereby affecting the active materials per unit area.The lateral force is combined,and the result is that the difference in the peak speed and half-life of the motor under different conditions is different.In summary,this study has explored the effects of different reaction conditions on the surface morphology of silver chloride films,and the effects of the motor's peak speed and half-life on the motor prepared under the same conditions.Our results not only proved the self-diffusion mechanism of micro-nano motor driven by UV light,it also laid a solid foundation for better grasp of the motor's motion and the design of faster micro-nano motors.