Preparation, Characterization and Ionizing Radiation Protection Properties of Electrospun Nanofibrous Mats Embedded with Erbium Oxide (Er2O3) Nanoparticles

2014 ◽  
Vol 27 ◽  
pp. 121-127 ◽  
Author(s):  
Fu Juan Liu ◽  
Qiu Na Cui ◽  
Ji Huan He ◽  
Dong Dong Fei
Keyword(s):  
Ionizing Radiation ◽  
Radiation Protection ◽  
Photoelectron Spectroscopy ◽  
Vinyl Alcohol ◽  
Composite Nanofibers ◽  
Poly Vinyl Alcohol ◽  
Erbium Oxide ◽  
X Ray ◽  
Protective System ◽  
Protection Capability

Ionizing radiation directly causes serious damage to human health, and a protective system capable of absorbing or reflecting ionizing radiation is required urgently. In this work, electrospun poly (vinyl alcohol) (PVA) and Poly (vinyl Alcohol)/Erbium Oxide (PVA/Er2O3) nanocomposite fibrous mats were fabricated. These PVA or PVA/Er2O3 composite nanofibers were completely characterized using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, Thermogravimetric Analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Furthemore, air permeability and ionizing radiation protection properties of these mats were also measured. Under a certain constant electropinning condition, the PVA or PVA/Er2O3 composite nanofibers showed an excellent morphology. The ionizing radiation protection capability of nanofibrous mats is considerably improved when incorporated with Er2O3 nanoparticles.

Electrospun Antibacterial Chitosan/Poly (Vinyl Alcohol) Nanofibers Containing Silver Nanoparticles

2010 ◽  
Vol 152-153 ◽  
pp. 1333-1336 ◽  
Author(s):  
Xu Pin Zhuang ◽  
Zheng Li ◽  
Wei Min Kang ◽  
Bo Wen Cheng
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Electrospun Fibers ◽  
X Ray ◽  
High Antibacterial Activity ◽  
Transmission Electron ◽  
Scanning Electron

New chitosan/poly (vinyl alcohol) (PVA) nanofibers functionalized with silver nanoparticles were electrospun using solutions of PVA blended with silver nanoparticles-chitosan composites. The structure of the electrospun fibers were studied with the aid of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results indicated that the electrospun fibers smoothly with 220 to 650 nm diameter, and the silver nanoparticles were successfully embed into the fibers which show high antibacterial activity against E.coli.

Preparation of Chitosan/Poly(vinyl Alcohol) Blend Nanofibers Containing Ag-SiO2 Nanoparticles via Electrospinning

2011 ◽  
Vol 675-677 ◽  
pp. 271-274
Author(s):  
Fang Fang Zuo ◽  
Bo Wen Cheng ◽  
Wei Min Kang ◽  
Yu Hao Ma
Keyword(s):  
Photoelectron Spectroscopy ◽  
Vinyl Alcohol ◽  
Electrospun Nanofibers ◽  
Sio2 Nanoparticles ◽  
Diameter Distribution ◽  
Poly Vinyl Alcohol ◽  
X Ray ◽  
Technical Parameters ◽  
Potential Applications ◽  
The Ideal

Chitosan (CS) / poly(vinyl alcohol) (PVA) blend nanofibers containing Ag-SiO2 nanoparticles (CS/PVA/Ag-SiO2 nanofibers) were successfully prepared by electrospinning using formic acid (HCOOH) as solvent in this paper. The morphology, diameter and structure of the electrospun nanofibers were examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS). And the diameter distribution of the nanofibers was measured by Image-Pro Plus. The results showed that the ideal nanofibers with the diameter in 85-165 nm can be obtained with the proper technical parameters as follows: the spinning voltage at 40 kV, the extruding speed at 0.5 mL/h and the collecting distance at 200 mm. The CS/PVA/Ag-SiO2 nanofibers will present potential applications in wound dressing and bandage etc.

Fabrication and Characterization of Poly(vinyl Alcohol)/Functionalized Graphene Oxide Nanofibers Produced by Electrospinning Method

2013 ◽  
Vol 747 ◽  
pp. 405-408
Author(s):  
Yuan Hsiang Yu ◽  
Chih Jie Jan
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Functionalized Graphene ◽  
Sem Images ◽  
Functionalized Graphene Oxide ◽  
X Ray ◽  
Electrospinning Method

A series of poly (vinyl alcohol) (PVA)/functionalized graphene oxide (FGO) nanofibers with low feeding ratios of FGO to PVA were fabricated by electrospinning method. In this study, the prepared PVA/FGO nanocomposites were dispersed in water phase followed by electrospinning treatment under different operational parameters (i.e., applied voltage, feeding rate and FGO contents) to give nanofibers of various diameters and morphologies. The morphology, diameter and structure of electrospun nanofibers and FGO were investigated by Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), (TGA) and differential scanning calorimetry (DSC). SEM images showed that the morphologies of the nanofibers were improved by the incorporation of FGO at a low loading content (e.g., 0.1~0.5 wt %) as compared to pure electrospun PVA. The crystallinity and thermal stability of PVA/FGO nanofibers were also studied.

scholarly journals Structure, Mechanical and Electrochemical Properties of Thermally Reduced Graphene Oxide-poly (Vinyl Alcohol) Foams

2017 ◽  
Author(s):  
Wenxiu Wang ◽  
Hui Xu ◽  
Jian Chen ◽  
Yuanfang Shen ◽  
Imre Bertóti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Vinyl Alcohol ◽  
Lithium Ion ◽  
Thermal Reduction ◽  
Poly Vinyl Alcohol ◽  
Structure Stability ◽  
X Ray ◽  
Wide Range

Graphene oxide foams with a wide range of poly (vinyl alcohol) contents were synthesized by freeze casting, and then thermally reduced at 300ºC in argon atmosphere. Their thermal stability, microstructure, composition and chemical states of constituents, mechanical and electrical properties were investigated by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetry, compressive testing and electrochemical analysis. The results indicated that the PVA content highly influenced the crystallinity and microstructure, resulting in different mechanical properties. After thermal reduction, not only graphene oxide was reduced to graphene, but also PVA was subjected to partial pyrolysis. With the increase of the PVA content, the intensity of the sp2 C-C bond decreased while the sp3 C-C bond increased. Although the mechanical properties decreased after thermal reduction, the composite foams still showed high cyclic structure stability up to 18 % compression strain. Meanwhile, the reduced foams exhibited high electrical conductivity. Applying as anodes in lithium ion battery, the initial discharge capacity for the foams can reach 1822 mA h g-1 and it remained more than 330 mA h g-1 after 50 cycles.

Sign in / Sign up

Export Citation Format

Share Document