Thermal, Raman and surface area studies of microcoiled carbon fiber synthesized by CVD microwave system

2002 ◽  
Vol 76 (3) ◽  
pp. 217-223 ◽  
Author(s):  
Jining Xie ◽  
Pramod K Sharma ◽  
V.V Varadan ◽  
V.K Varadan ◽  
Bhabendra K Pradhan ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Surface Area ◽  
Area Studies ◽  
Microwave System

Effect of Impurity and Gas Nature on Microstructure of SiC Microtubes in Double Step Reaction Process

2006 ◽  
Vol 510-511 ◽  
pp. 302-305
Author(s):  
Sang Won Myoung ◽  
Jin Ho Kang ◽  
Seong Hwan Park ◽  
Seoung Soo Lee ◽  
Dong Won Joo ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Surface Area ◽  
Carbon Fibers ◽  
Hydrogen Gas ◽  
Reaction Process ◽  
Qualitative Properties ◽  
Double Step ◽  
Small Surface ◽  
Membrane Type ◽  
Fiber Preforms

A novel process in the synthesis of SiC microtubes is proposed, based on modified CVD process. This process was adopted to siliconize the carbon fibers that perform with relatively small surface area, either partially or completely, into the SiC microtubes with large surface area. An oxidic vapor generated from a metal reacts with a carbon solid preform, which leads to a carbide possessing with a unique morphology. The carbon fiber preforms have been unidirectionally arranged into alumina tube, and then a solid-vapor reaction between carbon fiber preforms and SiO vapor originated from the mixture powder pack of Si and SiO2 has been carried out in restoration atmosphere (argon gas/hydrogen gas = 80/20) at 1450°C. The synthesized SiC.C composites were re-sintered with the modified mixture powder pack of Si, SiO2, Al, and Al2O3 at the same condition, in which amounts of Al and Al2O3 employed as a impurity have been controlled under 1 wt% with different mole ratios (Al2O3 : Al = 1:1, 2:1, 3:1). Two kinds of SiO and AlO vapors are generated in the second step reaction process, which react with carbon residuals. The quantitative and qualitative properties of the SiC micorotubes were analyzed by using TGA, SEM, and XRD. The inner morphology of the SiC micorotubes is dependent on the impurity concentration and the gas nature, showing the grains grown with membrane type in the second reaction process because of the impurity.

Effect of ACF Properties on the Electric Adsorption Performance of the ACF Electrode

2012 ◽  
Vol 209-211 ◽  
pp. 1990-1994 ◽  
Author(s):  
Qin Zhang ◽  
Zhao Hui Zhang ◽  
Liang Wang ◽  
Zi Long Zhang ◽  
Xing Fei Guo
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Activated Carbon Fiber ◽  
Adsorption Performance ◽  
Carbon Fiber Cloth ◽  
Activated Carbon Fiber Cloth ◽  
The Relationship

The properties of four different activated carbon fiber cloth (ACF), such as specific surface area, pore volumes and pore size distribution, were evaluated. The relationship between ACF properties and its electrosorption performance was analyzed. The experimental results show that pore structure has more influence on the performance of ACF electrode than that of specific surface area for ACF material. More abundant mesopores and shallower pore channels for ACF is favorable to improve the specific capacitance and electrosorption capacity of ions.

Fabrication of Carbon Fiber Embedded Carbon Aerogel via Supramolecular Assembly of Small Molecules in the Precursor Gel

2010 ◽  
Vol 146-147 ◽  
pp. 1917-1920
Author(s):  
Yuan Gang Li ◽  
Hua Jing Li ◽  
Bo Liu ◽  
An Ning Zhou ◽  
Xiao Gang Xi
Keyword(s):  
Carbon Fiber ◽  
Small Molecules ◽  
Surface Area ◽  
Supramolecular Assembly ◽  
Carbon Aerogel ◽  
Simple Addition ◽  
Electrical Conductivities ◽  
Maximum Conductivity

Carbon fiber embedded carbon aerogel (CFECA) was fabricated through simple addition of small organic gelators to the precursor formed by furfural and resorcinol. The surface area of the obtained CFECA decreased compared to that from the precursor without small gelator, but the electrical conductivities of the CFECA increased obviously. The maximum conductivity of the CFECA can reach 2.55 × 105 S/m which is more than three times as that of the referenced common carbon aerogel. The formation of CFECA was characterized by SEM as well as TEM observation.

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