Numerical analysis of the distribution of the electric field intensity of TiO2 microspheres under multidirectional UV radiation

The micro-nano robot can achieve precise targeting in the aspect of tumor drug delivery, so that the drug can enrich the focus area to the maximum extent and clear the focus, and the driving methods are varied, including chemical drive, physical drive and biological flagellum drive, etc. However, the development of micro-nano robot is mostly restricted by factors, and how to achieve accurate targeting is the premise of the application. Among many driving modes, magnetic drive has made a great breakthrough in precise control due to the existence of Helmholtz coil, and whether optical drive, which is also a physical driving method, can also realize three-dimensional trajectory motion control of micro-nano robot has become a key issue in current research. In order to solve this problem, spherical TiO
₂
of different sizes were prepared by two different technological methods: hydrothermal method and stirring method, and then modeled by COMSOL simulation software, the distribution of the electric field intensity on the surface of TiO
₂
microsphere under plane light irradiation was obtained by giving different incident light angles, wavelengths, microsphere sizes, etc. The simulation results were analyzed to obtain the correct control scheme.