Electrostatic Spinning Method Research Articles

The Fabrication of One-Dimensional BaAl<sub>12</sub>O<sub>19</sub>:Mn<sup>2+</sup> Phosphors by Electrospinning Method

One-dimensional BaAl12O19:Mn2+ nanofibers were fabricated by electrostatic spinning method. The effects of some factors on the product preparation were investigated, such as the pH value of precursors; the proportion of citric acid; calcination temperatures, and then the optimal synthetic conditions was obtained. The calcination temperatures of optimal sample is only 1100 °C, less about 400 °C than that of the traditional solid state reaction method. X-ray diffraction, scanning electron microscopy, transmission electron microscopy and photoluminescence spectroscopy were adopted to detect the structure, grain size, morphology and optical properties of the nanofibers, respectively. The fiber samples with good crystallinity consist of a great quantity of nanoparticles. The size of each nanoparticle is below 50 nm and the fiber diameter is about 400 nm. Possible formation process of the nanofibers by electrostatic spinning was also discussed.

Understanding the electrochemical superiority of 0.6Li[Li1/3Mn2/3]O2-0.4Li[Ni1/3Co1/3Mn1/3]O2 nanofibers as cathode material for lithium ion batteries

Solid solution cathode materials 0.6Li[Li1/3Mn2/3]O2-0.4Li[Ni1/3Co1/3Mn1/3]O2 with different morphologies were synthesized by electrospinning and coprecipitation method respectively. The field-emission scanning electron microscope images verified the successful formation of nanofibers for electrospinning and nanoparticles for coprecipitation and the nanofibers showed larger specific surface area according to the Brurauer Emmerr Teller procedure. The X-ray powder diffraction patterns and the corresponding lattice parameter refinements showed that both samples can be indexed to hexagonal α-NaFeO2 layered structure with space group of R-3m. And the material prepared by electrostatic spinning method has a tight atomic arrangement in the layer yet the different dimensions do not influence the intercalation and deintercalation of lithium ion through the interlayer. The discharge capacity of nanofibers electrode is 302.3mAhg−1 at 0.05C and the initial columbic efficiency is 76.2%, which are higher than 282.7mAhg−1 and 68.2% of the nanoparticles electrode. The nanofibers electrode also presented better cycleability and rate capability, especially performed capacity of 126.6mAhg−1 at 5C, much higher than that of 109.4mAhg−1 for nanoparticles electrode. The step-by-step cyclic voltammetry revealed that the nanofibers electrode performs higher discharge voltage platform and enhanced discharge energy density. The excellent electrochemical performance of nanofibers electrode is ascribed to the better conductivity and superior lithium ion diffusion ability according to the electrochemical impedance spectrum measurement.

Synthesis of polyaniline nanotubes through UV light catalytic method

Abstract In this study, nitrocellulose (NC) fiber blanket prepared by electrostatic spinning method has been used as a template, and copper nitrate (Cu(NO3)2) as an oxidant to synthesise polyaniline nanotubes doped with heteropolyacid (H4SiW12O40, SiW12) using UV light catalytic method. Infrared spectroscopy (IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technologies were applied to characterize the prepared samples of polyaniline nanotubes. The results show that the external diameter of the tube is about 200 nm, and the internal diameter about 170 nm. We also give a reasonable speculation and explanation about the formation mechanism of the nanotubes.

Preparation of PCL/silk fibroin/collagen electrospun fiber for urethral reconstruction

To prepare polycaprolactone (PCL)/silk fibroin/collagen electrospun nanofiber scaffold and test its effects on growth and proliferation of oral mucosal epithelial cells. Regenerated silk fibroin film, water-soluble collagen powder, and PCL, at mass ratios of 1:1:4, 1:1:8, and 1:1:10, were dissolved in hexafluoroisopropanol, and electrostatic spinning method was adopted to prepare PCL/silk fibroin/collagen electrospun nanofiber scaffold. In vitro cultured oral mucosal epithelial cells were inoculated on the material surface, MTT assay and scanning electron microscopy were adopted to study the growth and proliferation of oral mucosal epithelial cells on the material surface, and cell compatibility of PCL/silk fibroin/collagen electrospun nanofiber was evaluated. The result of MTT assay showed that oral mucosal epithelial cells were growing well on the PCL/silk fibroin/collagen electrospun nanofiber scaffold. Scanning electron microscopy showed that the prepared electrospun fiber was uniform in diameter and presented an interconnected porous net structure, and oral mucosal epithelial cells had a good growth form on the surface of the modified material. PCL/silk fibroin/collagen electrospun nanofiber scaffold has appropriate pore size and porosity, is suitable for the growth of oral mucosal epithelial cells, has good cell compatibility, and is a good scaffold for tissue engineering urethral reconstruction.

Synthesis and Characterization of Si/C Composite Anode by Electrostatic Spinning Method

Si/C composite anode material was successfully fabricated by an electrospinning method using PVP as macromolecule polymer collocation. The carbon derived from sintering PVP at high temperature plays a role in buffering size skeleton of silicon, which can effectively improve the volume expansion and pulverization problem of silicon at charge-discharge. The structure and morphology of the as-prepared samples were characterized by X-ray diffraction(XRD), Raman spectrum(Raman) and scanning electron microscope(SEM). The results show that the distribution of composite material is fibrous with diameter in the range of 300–400 nm. A "wheat like" structure is formed by Si particles distributed on the amorphous carbon fibers. The electrochemical test demonstrates that the irreversible capacity at first charge-discharge process is 294.9 mAh/g, which is due to the formation of solid electrolyte interface(SEI) film between the electrode and electrolyte. In addition, this composite material has very high columbic efficiency and excellent cycle stability, both at a low(0.1C, 0.2C and 0.5C) and high(1.0C and 2.0C) rates.

Super-Hydrophobic Surface Manufacture on Pyrolytic Carbon via Electrostatic Spinning Method

To reduce the adhesion of blood cells to the pyrolytic carbon surface of heart valve prosthesis, pyrolytic carbon is utilized as the foundation material for the realization of surface super-hydrophobicity. In this process, 10% PVP in concentration is used as the raw material and netted fiber film is textured on the surface of pyrolytic carbon material via electrostatic spinning method at the voltage of 12KV. The experiment results show that the contact angle of the pyrolytic carbon surface amounts to 154o after electrostatic spinning treatment and many porous structures are formed on the fiber film. The conclusion is thus reached that fiber film featured by super-hydrophobicity is attributable to the inability to fill the fiber meshes of liquid drops, which retain the air beneath and then give rise to this super-hydrophobic feature.

The Research on the Disperse Form of PEO Fiber by Electrostatic Spinning Method

We prepared PEO nano fiber with different concentration of PEO acid solution by electrostatic spinning in different technology conditions. Then we studied the property of solution by rotary viscometer instrument and electrical conductivity spectrometer, the disperse form of the fiber by SEM scattered forms, the thermal property of the composite was studied by thermogravimetry and derivative thermogravimetry (TG-DTA). The conclusion is the disperse form of fiber is controlled by the concentration of solution, the voltage of spinning, the distance of solidification. The important factor is about the solution. To increase the solution viscosity and the solidification distance, reduce the spinning voltage would decrease the diameter of the fiber. Thermal stability of fiber was significantly better than powder.

Fabrication and Characterization of Poly L-Lactic Acid/Modified Nano-Hydroxyapatite Composite Fibrous Scaffold

Nano-hydroxyapatite were modified with biocompatible polyethylene glycol (PEG) by surface coating, so modified nano-hydroxyapatite particles (modified nano-HA) were prepared. A homogeneous solution was obtained by dispersing the modified nano-HA into poly l-lactic acid (PLLA) solution. Composite fibrous scaffold was fabricated via electrostatic spinning method with the homogeneous solution. The composite fibrous scaffold was characterized by SEM, TEM and XRD techniques. The characterization results showed that the surface morphology of the composite fibrous scaffold was smooth, modified nano-HA was dispersed in PLLA homogeneously, the hydrophilicity of composite fibrous scaffold were increased obviously. Adipose-derived stem cells (ADSCs) proliferating in the fibrous scaffold were investigated by using laser scanning confocal microscope observation.

A New Feeding Device of Electrospinning Design for the Micro-Structure of Bone Scaffold Prototyping

In order to solve the problem that bone cells can not adhere to the pore wall, the paper introduces a new method that combines RP method with electrostatic spinning method is used for the preparation of a comprehensive new bone scaffold technology, and pays close attention on the automatic control of process parameters, the feeding speed. According to the model of feed speed and the diameter of nano-fibers, a theoretical guidance is given to the real-time control of feed speed, and a new feeding device, including the configuration software iFIX, a microcontroller, a sensor and stepping motor, is presented. It can give a real-time effective control of the feed speed, which provides a theoretical and technological basis for the quality of scaffolds prototyping.

A filter material based on fibrous scintillators for monitoring radioactive contamination

A fundamentally new filtration material has been developed on the basis of original methods for producing porous and fibrous polymeric scintillators. This material combines the ability to filter radioactive contaminations in liquids and gases with the possibility of continuously monitoring the radioactive contamination level. The filtration materials were manufactured by means of the technology of production of nonwoven filtration materials involving the electrostatic spinning method. Our study resulted in the production of ultrathin fibers based on polystyrene with various luminescent additives. The obtained bifunctional filtration materials incorporated in a detector based on an ФЭУ-100 PMT have been tested under laboratory conditions in the realtime mode. The detector’s performance parameters—sensitivity to radon, radiation-response linearity, and radiation stability—have been measured. The activity-decay and luminescence-intensity-decay constants of the exposed samples almost coincide, thereby indicating a high radiation resistance of the material. The filtration material exhibits high sensitivity to the detection of different types of pollution with radioactive preparations, including α-and β-active substances.