scholarly journals Preparation and Characterization of Electrospun PAN/PSA Carbonized Nanofibers: Experiment and Simulation Study

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 821 ◽  
Author(s):  
Shixin Jin ◽  
Jiali Yu ◽  
Yuansheng Zheng ◽  
Wen-Yi Wang ◽  
Binjie Xin ◽  
...  
Keyword(s):  
High Temperature ◽  
Electric Field Distribution ◽  
Fiber Diameter ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
The Finite Element Method ◽  
Before And After ◽  
Nanofiber Membranes ◽  
Scanning Electron

In this study, we simulated the electric field distribution of side-by-side electrospinning by using the finite element method (FEM), and studied the effects of spinneret wall thickness, spinning voltage and receiving distance on the distribution of the electrostatic field. The receiving distance was selected as a variable in the experimental, a series of PAN/PSA composite nanofiber membranes were prepared by using a self-made side by side electrospinning device. The membranes were tested by Fourier-transform infrared (FTIR), thermogravimetric analysis (TG), and scanning electron microscope (SEM). The prepared membranes were also treated by high-temperature treatment, and the change of fiber diameter and conductivity of the membrane before and after high-temperature treatment were studied. It was found that the PAN/PSA carbonized nanofibers could achieve a better performance in heat resistance and conductivity at 200 mm receiving distance.

scholarly journals Characterization of the Materials Synthesized by High Pressure-High Temperature Treatment of a Polymer Derived t-BC2N Ceramic

Materials ◽  
2011 ◽  
Vol 4 (12) ◽  
pp. 2061-2072 ◽  
Author(s):  
Wallace R. Matizamhuka ◽  
Iakovos Sigalas ◽  
Mathias Herrmann ◽  
Leonid Dubronvinsky ◽  
Natalia Dubrovinskaia ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
High Pressure High Temperature

Characterization of Zr-doped TiO2 prepared by homogenous co-precipitation without high-temperature treatment

2007 ◽  
Vol 42 (22) ◽  
pp. 9421-9428 ◽  
Author(s):  
Jozef Lukáč ◽  
Mariana Klementová ◽  
Petr Bezdička ◽  
Snejana Bakardjieva ◽  
Jan Šubrt ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Doped Tio2 ◽  
Co Precipitation

Promoted Chain Diffusion of UHMWPE/HDPE Blend by High Temperature Treatment

2015 ◽  
Vol 815 ◽  
pp. 557-561
Author(s):  
Chun Hua Fan ◽  
Hai Zhou Kong ◽  
An Zhun Xie ◽  
Bang Hu Xie
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Complex Viscosity ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Solution Blending ◽  
The Difference ◽  
Uhmwpe Particle ◽  
Rheological Test ◽  
Scanning Electron

Ultra high temperature treatment was used to promote the molecular chain diffusion of UHMWPE/HDPE blend. At the same time, melt blended sample and solution blended sample were also prepared for a comparison. The phase morphology of the samples observed by scanning electron microscope (SEM) showed that the difference between HDPE and UHMWPE became smaller after high temperature treatment. While the UHMWPE particle could not be observed in solution blending samples. The results of rheological test showed that the elastic modulus and complex viscosity of treated samples are higher than that of untreated samples but still below the viscosity of solution blending sample. The results deem, high temperature treatment indeed promoted the chain diffusion of UHMWPE/HDPE blend and a good fusion between HDPE and UHMWPE is obtained as a result

Scanning tunneling microscope study of polyacrylonitrile-based carbon fibers

1997 ◽  
Vol 12 (10) ◽  
pp. 2543-2547 ◽  
Author(s):  
Dongxia Shi ◽  
Ning Liu ◽  
Haiqiang Yang ◽  
Juning Gao ◽  
Yueshan Jiang ◽  
...  
Keyword(s):  
High Temperature ◽  
Carbon Fibers ◽  
Electrochemical Treatment ◽  
Temperature Treatment ◽  
Resistance Test ◽  
High Temperature Treatment ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Before And After ◽  
Spinning Process

Scanning tunneling microscopy (STM) was used to characterize the surface topography of polyacrylonitrile (PAN)-based carbon fibers before and after electrochemical treatment, stretch resistance test, and high-temperature treatment. A new kind of spiral structures was found, which was not only on the surface but also in the inner layer. The spiral structure of the fibers was caused by the spinning process. The fiber structure contained the shape of the precursor. There were some large cracks in the carbon fibers after the stretching resistance test. The large cracks can result in carbon fiber breaking under certain stress conditions. The difference in the structures of the carbon fibers before and after the high-temperature treatment was determined.

Characterization of Fossil Oil Fly Ash and the Enrichment of the Contained Vanadium as V4C3 by High-Temperature Treatment

1995 ◽  
Vol 7 (5) ◽  
pp. 865-870 ◽  
Author(s):  
C. Aurisicchio ◽  
G. Bardi ◽  
A. Colligiani ◽  
F. Corigliano ◽  
L. D'Alessio ◽  
...  
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Oil Fly Ash
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