scholarly journals Ocean Electric Field Tests of Carbon Fiber Electrodes Prepared by Nitric Acid Oxidation

2021 ◽  
Vol 27 (1) ◽  
pp. 96-102
Author(s):  
Yusu SONG ◽  
Hongxia LI ◽  
Yueming WANG
Keyword(s):  
Nitric Acid ◽  
Carbon Fiber ◽  
Electric Field ◽  
Carbon Fibers ◽  
Evaluation System ◽  
Electrochemical Impedance ◽  
Field Tests ◽  
Acid Oxidation ◽  
Field Detection ◽  
Nitric Acid Oxidation

The concentrated nitric acid oxidation was chosen as the surface treatments on carbon fibers in this paper. Treated carbon fibers were subjected to subsequent processing and forming, the electrodes applied in marine electric field detection were prepared. The electrochemical properties that related to practical application in marine electric field detection such as potential stability, polarization and cyclic voltammetry performance, the electrochemical impedance and the self-noise were characterized, thus an electrochemical evaluation system was formed to optimize the oxidation technology. Combining with the TGA and FTIR, the physical properties of carbon fibers were characterized and some oxidation laws were induced. The results indicate that the carbon fiber electrode prepared by oxidation 4 hours at 110 ℃ has the best electrochemical performance for detection.

Liquid-Phase Oxidation Modification of Carbon Fiber Surface

2012 ◽  
Vol 430-432 ◽  
pp. 2008-2012 ◽  
Author(s):  
Wen Bo Lu ◽  
Cheng Guo Wang ◽  
Hua Yuan ◽  
Xiu Ying Hu
Keyword(s):  
Nitric Acid ◽  
Liquid Phase ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Surface ◽  
Oxidation Time ◽  
Liquid Phase Oxidation ◽  
Acid Oxidation ◽  
Oxidation Treatment ◽  
Phase Oxidation

The carbon fibers were subjected to liquid–phase oxidation treatment in 65% nitric acid solution. The relation between liquid-phase oxidation time and structure of carbon fibers had been assessed by LRS, XRD, SEM, and FTIR. The results indicate that smaller surface crystallites obtained by etching and more unsaturated carbon created after treatment, and corrosion enhanced with the increase of oxidation time. But nitric acid oxidation treatment does not change the bulk structure of carbon fibers. After nitric acid treated, the grooves of surface is wider and deeper compared to the original carbon fiber, When the oxidation times reach 12 hours, the surface of carbon fibers is severely damage. When the oxidation times reach 6 hours, there is not any characteristic peek in the FTIR. But after oxidation treatment for 9 hours, -COOH, -OH can be found from FTIR. So the best time for liquid-phase oxidation process is 9 hours.

Nitric acid oxidation of carbon fibers and the effects of subsequent treatment in refluxing aqueous NaOH

Carbon ◽  
1995 ◽  
Vol 33 (5) ◽  
pp. 597-605 ◽  
Author(s):  
Zhihong Wu ◽  
Charles U. Pittman ◽  
Steven D. Gardner
Keyword(s):  
Nitric Acid ◽  
Carbon Fibers ◽  
Subsequent Treatment ◽  
Acid Oxidation ◽  
Nitric Acid Oxidation

Effects of Different Surface Modification to the Carbon Fiber Electro-Mechanical Response

2011 ◽  
Vol 214 ◽  
pp. 597-601 ◽  
Author(s):  
Xi Fang ◽  
Si Rong Zhu ◽  
Zhuo Qiu Li ◽  
Yong Lv
Keyword(s):  
Surface Modification ◽  
Nitric Acid ◽  
Carbon Fiber ◽  
Mechanical Response ◽  
Chemical Elements ◽  
Mechanical Effect ◽  
Acid Oxidation ◽  
Interface Properties ◽  
Nitric Acid Oxidation ◽  
Chemical Groups

The interface properties of carbon fiber(CF) within the composite material has a great effect to its functional characteristics. The work is focused on the research of CF electro-mechanical response after its surface modification using acetone and nitric acid oxidation. With characterization by XPS and SEM, there exist the various changes on the CF surface not only the chemical elements or chemical groups. With changing CF’s resistance under uniaxial tension, the CF has differerent electro-mechanical response to loading force. Through statistical analysis, the research shows the sensibility of CF to the electro-mechanical effect can be improved by the surface modification with acetone process or nitric acid oxidization.

Nitric Acid Oxidation of Si for the Tunneling Oxide Application on CoSi[sub 2] Nanocrystals Nonvolatile Memory

2010 ◽  
Vol 157 (3) ◽  
pp. H332
Author(s):  
Chih-Wei Hu ◽  
Ting-Chang Chang ◽  
Chun-Hao Tu ◽  
Yang-Dong Chen ◽  
Chao-Cheng Lin ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Nonvolatile Memory ◽  
Acid Oxidation ◽  
Nitric Acid Oxidation

BRIDGING OF CARBON FIBERS IN CF/EPOXY COMPOSITES USING ELECTROSTATICALLY INDUCED CNT ALIGNMENT

2021 ◽  
Author(s):  
DANDAN ZHANG ◽  
XINGKANG SHE ◽  
YIPENG HE ◽  
WESLEY A. CHAPKIN, ◽  
VI T. BREGMAN ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Electric Field ◽  
Carbon Fibers ◽  
Hybrid Composites ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
Polymer Mixture ◽  
Ac Electric Field ◽  
Reinforced Polymer ◽  
Electric Field Direction

Carbon fiber reinforced polymer (CFRP) composites are lightweight materials with superior strength but are expensive due to the increased cost of carbon fibers (CFs). The addition of carbon nanotubes (CNTs) to polymer nanocomposites are becoming an excellent alternative to CF due to their unique combination of electrical, thermal, and mechanical properties. With the application of an electric field across the CNT/polymer mixture before curing, CNTs will not only be aligned along the electric field direction, but also form networks after reaching to a certain degree of alignment. In this study, an alternating current (AC) electric field was applied continuously to CNT/CF/Epoxy hybrid composites before curing. By cutting off the applied voltage when the monitored electric current increased, the degree of networking of CNTs between two CF tows was controlled. The relative electric field strength around the end of conductive carbon fiber tows in the epoxy matrix was modeled using COMSOL Multiphysics. It increased after applying AC electric field parallel to the CF tows, thereby increasing the alignment degree of CNTs and building a network to bridge the CF tows. The preliminary results indicate that the microhardness and tensile modulus between two CF tows are increased due to the networking of CNTs in this area. The fracture surface of the specimens after tensile tests were characterized to reveal more details of the microstructure.

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