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An efficient, novel and convenient method for the synthesis of modified polyacrylonitrile (PAN) with antibacterial property is reported. The modification of PAN was prepared by a nitrile click chemistry reaction with sodium azide (NaN3) and silver nitrate (AgNO3) as catalyst to yield antibacterial polymeric materials with 5-vinyltetrazole units. The results showed that 5-vinyltetrazole units had coordinated...
An improved tip-less electrospinning is applied to massive production of high-quality nanofibers by utilizing a strip-distributed solution delivery method. Polyethylene oxide solution coats a metal cylinder and is distributed in several separate annular subareas. These narrow polymer strip coatings confine Taylor-cone location and regularize the electric field in longitudinal direction. This positional...
Oxide gas sensor based on electrospun nanofibers were fabricated and studied in this paper. Polyvinyl pyrrolidone (PVP)/Nickel acetate precursor nanofibers were electrospun, which were sintered into Nickel oxide (NiO) nanofibers with diameter in the range of 100 to 400 nm. The morphology and structure of NiO nanofiber were characterized by scanning electron microscopy and X-ray diffraction. The Gas...
Higher conductivity of electrospun nanofiber mat was observed by four-terminal resistance measurement compared to polyaniline (PANI)/ Polyethylene oxide (PEO) film based on the same doping method. In order to improve conductivity of the blended polymer and guarantee its spinability in the meanwhile, the concentration of PEO with great molecular weight of 5,000,000 could be decreased to 0.10wt%. The...
Ethyl cellulous (EC) fibrous films were fabricated via electrospinning from solutions with various DMF/acetone volume ratios and the hydrophobic properties were investigated. The morphology of electrospun EC films reveals a conversion from beads to uniform nanofibers by decreasing the DMF/acetone ratio. Pure DMF solution leads to bead structures while uniform nanofibers can be obtained from DMF/acetone...
Compared with conventional fibrous filters made of microfibers, the nanofibrous filters exhibit some special performances. Here, PVA nanofibrous membrane with thickness 28.37um was made by electrospinning 8% PVA solution on conventional cotton scaffold. The air filtration test system was built to test the filtration performance between PVA nanofibrous membrane and conventional fibrous filters which...
Both experiment and simulation works were utilized to research the deposition behavior of single coiled nanofiber on silicon substrate from Near-Field Electrospinning (NFES). In the experiment process, when the collector moving speed (CMS) is compatible with electrospinning speed, straight line nanofiber can be collected. When CMS decreases, jet would step into whipping motion due to the imbalance...
Filter samples composed of PVA nanofibrous membrane on the cotton yarn substrates were made from electrospinning. A filtration experiment system is designed to test the filtration performances of nanofibrous filters, and filtration efficiency and pressure drop of nanofibrous filter were discussed. Compared to the conventional filter, PVA nanofibrous filtration has special advantages on the filtration...
Near-Field Electrospinning (NFES) was utilized to research the buckling behaviors of electrospinning nanofiber on the silicon patterned substrate. Nanofiber would be deposited in spiral shape due to the bulking behaviors of jet. Buckling of jet is more obvious under the stronger electrical field and lower collector motion speed (CMS), which leads nanofiber to be deposited in spiral shape. The electrical...
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