• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.39 no.4
• /
• pp.379-384
• /
• 2015

Electrospinning has recently been used for micropatterning. The electrospinning method as a patterning tool has the advantage of a rapid patterning speed because it is based on a continuous printing mode rather than a drop-on-demand mode. To obtain stable continuous printing, a high molecular weight polymer must be mixed with functional materials for patterning. In this paper, polyethylene oxide (PEO) was used. The effect of polymer on viscosity and formation of a Taylor cone jet from the electrospinning nozzle was investigated. Finally, the electrospinning patterning results of a silver paste ink on a glass substrate were investigated.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.37 no.2
• /
• pp.224-234
• /
• 2013

This study investigates the fabrication of core-sheath nanocomposite fibers by locating germanium (Ge) and silicon dioxide ($SiO_2$) nanoparticles selectively in the sheath layer by co-axial electrospinning. Co-axially spun fibers were prepared by electrospinning a pure PVA solution and Ge/$SiO_2$/PVA solution as the core and sheath layer, respectively. Core-sheath nanocomposite fibers were electrospun under a variety of conditions that include various feed rates for the core and sheath solutions, voltages, and concentric needle diameters, in order to find an optimum spinning condition. Ge/$SiO_2$ nanocomposite fibers were also prepared by uniaxial electrospinning to compare fiber morphology and nanoparticle distribution with core-sheath nanofibers. Using scanning electron microscopy, transmission electron microscopy, and energy dispersive X-ray analysis, it was demonstrated that the co-axial approach resulted in the presence of nanoparticles near the surface region of the fibers compared to the overall distribution obtained for uni-axial fibers. The co-axially electrospun Ge/$SiO_2$/PVA nanofiber webs have possible uses in high efficiency functional textiles in which the nanoparticles located in the sheath region provide enhanced functionality.

• Proceedings of the Korean Fiber Society Conference
• /
• 2003.10b
• /
• pp.273-274
• /
• 2003

Chitin and chitosan have a wide range of application on the environmental and biomedical engineering by their biocompatibility, biodegradability, non-toxicity and adsorption property, etc. The efforts of manufacturing chitosan fibers are continuously maintained until now$\^$l.2)/. Electrospinning is new method to produce the nano-sized fibers for medical uses. Recently, formation of chitosan fiber using electrospinning is studied by many textile researchers. (omitted)

• 한국정보디스플레이학회:학술대회논문집
• /
• 2004.08a
• /
• pp.978-980
• /
• 2004

We report the preparation and properties of polymer paste solutions with CNTs using conventional paste forming process. Electrospinning has been used for the fabrication of nano-fiber composite. In this process, dispersion of CNTs is very important matter. So, we emphasize the necessity of dispersion of CNTs in the solution and investigate effects of process parameters of electrospinning. The advantage of simple electrospinning process will be discussed..

• Current Research on Agriculture and Life Sciences
• /
• v.33 no.1
• /
• pp.15-18
• /
• 2015

Zein/Poria cocos extract nanofibers were prepared based on the electrospinning of aqueous solutions with different Poria cocos extract concentrations (0, 5, 10, and 15 wt.%). The electrospinning parameters, including the polymer contents, voltage, and tip-to-collector distance (TCD), were optimized for the fabrication process. The resulting electrospun materials were all characterized using field-emission scanningelectron microscopy (FE-SEM). The diameters of the electrospun zein nanofibers were found to increase when increasing the zein concentration.

• Proceedings of the KSME Conference
• /
• 2003.04a
• /
• pp.1869-1874
• /
• 2003

Polymeric fibers with nanometer-scale diameters are produced by electrospinning. When the electrical forces at the surface of a polymer solution or melt overcome the surface tension then electrospinning occurs. Polyethylene oxide (PEO), Polycarbonate have been electrospun in our laboratory. Electrospun fibers are observed by optical microscopy or scanning electron microscopy. The average diameters of the electrospun fibers range from 300 nm to 30 nm when the electric field strength increasing from 1 kV/cm to 3 kV/cm. The average diameters of the electrospun fibers range from 200 nm to 30 nm when the concentration decreasing from 10 wt% to 4 wt%.

• Journal of Sensor Science and Technology
• /
• v.24 no.1
• /
• pp.35-40
• /
• 2015

Electrospinning method has easy preparation of nanofibers with a simple and versatile technique. Electrospun nanofiber is widely used by the simple approach and have great potentials in the numerous applicaitons of medicine, photonics, catalysts, sensors, etc. including advantage of their specific characteristics such as large surface to volume ratio. This paper focused on the fabrication of cobalt electrospun nanofibrer for applications such as electronic, optical and mechanical devices by metal based material. We fabricated cobalt nanofibers on aluminum foil by an electrospinning method. The electrospinning process was performed at a high voltage, 8 kV. The distance between the needle tip and the solution surface in the bath was 5 cm. The PVB - cobalt based nitrate solution was filled in a 10 mL syringe connected to a 22 gauge needle. We confirmed electrospun cobalt nanofiber after annealing process by SIMS (Secondary Ion Mass Spectrometry) analysis. The concept design, fabrication and results of mapping measurements are reported.

• Fibers and Polymers
• /
• v.3 no.2
• /
• pp.73-79
• /
• 2002

Nanoscaled PVA fibers were prepared by electrospinning. This paper described the electrospinning process, the processing conditions fiber morphology, and some potential applications of the PVA nato-fibers. PVA fibers with various diameters (50-250 nm) were obtained by changing solution concentration, voltage and tip to collector distance (TCD). The major factor was the concentration of PVA solution which affected the fiber diameter evidently. Increasing the concentration, the fiber diameter was increased, and the amount of beads was reduced even to 0%. The fibers were found be efficiently crosslinked by glyoxal during the curing process. Phosphoric acid was used as a catalyst activator to reduce strength losses during crosslinking. Scanning electron micrograph (SEM) and differential scanning calorimetric (DSC) techniques were employed to characterize the morphology and crosslinking of PVA fibers. It was fecund that the primary factor which affected the crosslinking density was the content of chemical crosslinking agent.

• Journal of ILASS-Korea
• /
• v.8 no.2
• /
• pp.31-37
• /
• 2003

Polymeric fibers with nanometer-scale diameters are produced by electrospinning method. When the electrical forces at the surface of a polymer solution or melt overcome the surface tension, then electrospinning occurs and nanofibers are made. Polyethylene oxide(PEO) have been electrospun in our laboratory Electrospun PEO fibers are observed by scanning electron microscopy or transmission electron microscopy In thl:; study. the average diameter of the electrospun fibers decreases with decreasing PEO concentration and increasing electric field strength. The optimal conditions for producing uniform PEO 100nm fibers are the 10wt% PEO concentration at a voltage 25 to 30kV and a distance of 10cm from tip to collector.

• Macromolecular Research
• /
• v.14 no.1
• /
• pp.59-65
• /
• 2006

We report a new approach to fabricate electrospun polymer nonwoven mats with porous surface morphology by varying the collector temperature during electrospinning. Polymers such as poly(L-lactide) (PLLA), polystyrene (PS), and poly(vinyl acetate) (PVAc) were dissolved in volatile solvents, namely methylene chloride (Me) and tetrahydrofuran (THF), and subjected to electrospinning. The temperature of the collector in the electrospinning device was varied by a heating system. The resulting nonwoven mats were characterized by using scanning electron microscopy (SEM), field emission SEM (FESEM), and atomic force microscopy (AFM). We observed that the surface morphology, porous structure, and the properties such as pore size, depth, shape, and distribution of the nonwoven mats were greatly influenced by the collector temperature.