Simulation Of Electrohydrodynamic Atomizated Droplet Trajectory And Experiment Research Of Deposition

Electrohydrodynamic atomization (EHDA), one of important branches of electric fluid, mainly uses electric fluid force to overcome the liquid surface tension and lead to the fluid broke into tiny droplets forming atomization phenomenon. The advantage of EHDA is that its droplets can be extremely small, and the charge and size of the droplet can be controlled by electrical means. Besides, the thickness of single layer deposited film is quite thin, which has been widely concerned. How to control the process of EHDA, in order to obtain ideal sedimentary structure, has been the focus of attention. In this article, a numerical model for the simulation of electrohydrodynamic atomizated droplet trajectory had been built to research deposition experiment.Basing on the existing theory and experimental data of electrohydrodynamic atomization, a numerical simulation model of charged droplet trajectories was built using the Comsol software. The effect of different atomization parameters (flow rate, working distance, applied voltage) on Pt/C and Pt-Ru/C nano-suspension atomization experiments and the movement of the charged droplets were discussed, respectively.A focusing electrode was added to the traditional EHDA experiment device to control the trajectories of charged droplets, which make the deposition area of atomization droplets smaller than that without focusing electrode. The effect on EHDA of Different types of focusing electrodes have been analyzed respectively. By adjusting the flow rate, the graphene lines of dozens of micrometers have been got.Finally, Graphene nano-suspension was were used to study electrohydrodynamic atomization (EHDA) which used Polydimethylsiloxane (PDMS) as substrate. The PDMS had been treated by oxygen plasma to obtain the cone-jet mode. Comparison of different structure deposited by EHDA on the modified and unmodified PDMS has been made. Graphene films were formed on the oxygen plasma treated PDMS at different working distances. Raman spectrum analysis was made at the laser of785nm wavelength. The least sheet resistance among graphene films deposited by EHDA is1270·sq-1. Then, some graphene line (30μm～170μm) were deposition at the assistance of metal template.