Lan Xu

Effect of surface-active agent on morphology and properties of electrospun PVA nanofibres

After the addition of a surface-active agent, sodium dodecyl benzene sulfonate (SDBS), electrospun polyvinyl alcohol (PVA) nanofibres showed a significant enhancement in the mechanical properties, such as improved tensile strength and elongation at break. The improved crystallinity and strong intermolecular hydrogen bonds between the molecules of SDBS and PVA were the two main factors that improved the mechanical properties. In addition, a sharp decrease in surface tension of PVA solution with the addition of SDBS was observed, and the protruding droplet at the tip of needle diminished in the electrospinning process.

Fabrication and Characterization of Chinese Drug-Loaded Nanoporous Materials

Chinese drug-loaded nanoporous materials were prepared from electrospinning Poly (butylenes succinate) (PBS) solutions with an additive of Chinese drug and a mixed solvent of chloroform and iso-propylalcohol in a single processing step. Characterizations of the samples, such as morphology, wettability and permeability, were studied by means of scanning electron microscope, full automatic micro droplet wettability measurement instrument and fabric air permeability performance tester. The results showed these characterizations could be controlled by adjusting electrospinning parameters such as flow rate and drug concentration. And the electrospun nanoporous materials might offer the potential for direct fabrication of biologically based and high-surface-area porous materials.

Fabrication of Aligned PAN Nanofiber by Electrospinning with Parallel Electrode

Electrospinning has emerged as a very attractive approach to the fabrication of nanofibers. In electrospinning process, the ability to control the alignment and arrangement of fibers is critical to achieve the designed functions. In this paper, we had successfully fabricated highly aligned PAN nanofibers by the method of parallel electrode electrospinning. The study revealed the optimum weight ratio of PAN polymer solution for aligned nanofibers was 8%-12%. Results show that the increasing of weight ratio of polymer solution can enhance the parallelism and uniformity of electrospun fiber diameter distribution.

Effect of Ultrasonic Vibration on Electrospun Poly(vinyl Alcohol) (PVA) Nanofibers

Poly (vinyl alcohol) (PVA), a classical biodegradable polymer, is successfully fabricated into nanofibers via the vibration-electrospinning, and the obtained nanofibers are characterized by the scanning electron microscopy (SEM). The viscosity and electrical conductivity of PVA solution vary dramatically with the ultrasonic radiation time and intensity. The novel strategy can produce finer nanofibers than those obtained without ultrasonic vibration.

Detachment of a Charged Nano-Jet for Fabrication of Nanoporous Materials

A charged jet can be accelerated by an electrostatic field for fabrication of continuous micro/nanofibers. A higher voltage results in smaller nanofibers. However, when the voltage surpasses a threshold value, discontinuous nanomaterials can be fabricated.

Fabrication of Polyacrylonitrile Nanoporous Fibers via Electrospinning

This study provide several straightforward ways to fabricate nanoporous fibers with diameters in the rang from nanometers to several micrometers.The PAN nanoporous fibrous materials are unique in their ultrahigh specific surface and porous geometry and have the potential to meet emerging needs in advanced technical applications. PAN nanoporous fibers were electrospun in a single process by varying solvent compositions. Polyacrylonitrile (PAN) and Polylactide (PLA) bicomponent electrospun fibers, upon removal of the PLA by CF solvent extraction, became nanoporous. The surface morphology of the electrospun PAN fiber are investigated by a Scanning Electron Microscope (SEM).

Web-Like Nanofibers for Improving Fibroblast Growth

During electrospinning process, charged web jets solidify with solvent evaporation and form two-dimensional (2D) web-like nanofibers on the collecting plate. In this paper, Poly [(lactic acid)-co-(glycolic acid)] (PLGA) solutions are used to produce different 2D web-like nanofibers, which can mimic the physical features of natural extracellular matrix (ECM) at the nanoscale and improve fibroblast growth. According to mass conservation, the possible mechanisms for the web formation are investigated.

Electrospun Nanoporous Poly(butylenes succinate-co-bytylene terephthalate) Nonwoven Mats

A traditional Chinese drug “Yunnan Baiyao” is used as an additive in poly(butylenes succinate-co-bytylene terephthalate) (PBST) solution, which is a kind of biodegradable aliphatic-aromatic copolyesters, to produce microspheres with nanoporosity by electrospinning; the tunable size of nanoporosity can be controlled by changing the voltage applied in the electrospinning process.

Fabrication of Porous Non-Woven Mats via Electrospinning

A triple liquor system (Poly(Butylenes Succinate-co-bytylene Terephthalate) (PBST)/ iso-propylalcohol (IPP)/ chloroform (CF)) was electrospun to fabricate porous non-woven mats directly. The morphology of the porous mats were observed by SEM(Scanning Electron Microscope). The applied voltage is investigated as a parameter may affect the morphology of the porous structure.