The Deposited Process Of Electrospinning Nanofibers Morphology

Electrospinning is the most efficient and economic technology to manufacture the nanofibers, and showing powerful application value such as in environment, electronic and biomedical field. As we know, the fiber deposited morphology plays an important role in its applications, for instance, the disorder nanofibers can deposited as nanofiber membrane and mainly use for environmental application, while the aligned nanofibers or patterned nanofibers generally be used for MEMS applications or biomedical applications. Therefore, this paper will study the process of three different types nanofiber deposited morphology, including disorder nanofiber deposited morphology process, Near-field electrospinning direct writing alignment nanofiber deposited morphology process and using physical field controls the wavy nanofiber deposited morphology via Near-field electrospinning.Firstly, aim at linear array nozzles electrospinning for disorder nanofiber morphology deposited process, nozzles distribution (topology structure and distance) and collector will be studied in this paper. Comsol will be used as finite tool to analysis electric field in this paper, this will help to design and optimize the sprayer, and help to build an experimental setup, and then the 9wt% PVA solution will be used in this experiment. The experimental results show that the electric filed at the tip of the nozzles decrease as the nozzles number increase; expanding the nozzles distance can help to decrease the interaction of the electric field; the sprayer topology structure and collector method also help to weaken the electric field interaction. Cylinder is the best way to contribute a uniform electric field when large air nozzles distribution.Secondly, during Near-field electrospinning (NFES) for linear array nanofiber morphology deposited process, the parameters affected linear array nanofiber morphology will be studied in this paper. A CNC system based on high precision motion platform will be built as experimental setup, and the linear array nanofiber morphology can be deposited controllably.4wt% PEO solution will be used here as spinning material. The applied voltage, nozzles and collector distance, collector speed will be studied here, and the controllable deposited fiber distance will also be studied in this experiment, which can provide reference for further studies.At last, the controllable AC current will be firstly applied to control wavy fibers deposition during Near-field electrospinning process. With the help of experiment records, simulation and high-speed camera, the wavy fiber deposition process will be studied here. The experimental results show that The AC current can be applied to control wavy fiber deposition via Near-filed electrospinning, including its amplitude and generate frequency.The disorder nanofiber morphology deposited law, NFES direct-write linear array nanofiber morphology law and wavy fiber morphology via NFES deposited law will be show in this paper, which is significant for electrospinning manufacture equipment designing and process optimizing.