Research Of Single Jet Electrohydrodynamic Direct Writing Induced By Alternating Electric Field

Electrohydrodynamic Direct Writing(EDW) is a new direct writing technique, which have a huge potential in the fabrication of organic micro-nano system and flexible electronics because of its advantages. Make the micro-nano structure orderly deposited on the insulating substrate is the key to expand EDW to be applied. This paper focused on how the EDW single jet deposit stably on the insulating substrate and study the control law of single jet injection in alternating current(AC) electric field. Investigate how the charged jet deposit on the insulating substrate when in AC electric field.Simulation mode of EDW was built and single jet injection was simulated in both of AC and DC electric field. Not only the electric field parameters and solution properties were investigated in the simulation, but also we have got the laws between these parameters to the jet. At the same time, the charge distribution and velocity of the jet injection were clearly presented in the paper. Paper also gave the theory about the influence of charge change to the jet injection on the substrate and laws of experimental parameters to EDW were tested.Experiments about deposition behavior of the solution single jet induced by the AC electric field were investigated. And how the diameters(50-3OOμm) and deposition frequencies of drops deposited on the substrate change with the difference experiment parameters were studied. The increase of voltage amplitude and frequency of the AC electric field can make the drop diameters smaller and drop frequency bigger. But the increase of supply rate of the solution will make the frequency of drops decrease and diameter increase. Different concentrate of solution have different deposition. With the increase of solution conductivity the diameter of drops will decrease.After comparing the difference of AC and DC electric field to the influence of EDW, it is found that solution jet hard to deposit on the flexible insulating substrate when in the DC electric field, such as jet bifurcation or come to multiple jets. Experiments try to use the benefits of AC power supply to overcame these trouble of solution jet deposition on the flexible insulating substrates and clear the influence of AC electric field parameters to the jet deposition. Finally, well ordered and uniform jets deposition(10-50μm) were deposited on the insulating substrate. These work proposed an effective way for the s EDW deposition on the flexible insulating substrate.After these research, EDW deposition when in the AC electric field was deeper understanding and the technique of polymer solution deposition on flexible insulating substrate was mastered. These work make polymer solution have single jet on the flexible insulating substrate become possible when in the AC electric field and obtain ordered deposition on the insulating substrate with the use of EDW.