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.

Study on the Composites of Phenol Formaldehyde Resin/Graphite Reinforced by Milled Carbon Fibers for Bipolar Plates

2010 ◽  
Vol 156-157 ◽  
pp. 1090-1096
Author(s):  
Wei Qiang Wang ◽  
Ai Ju Li ◽  
Ming Ming You ◽  
Bin Xia
Keyword(s):  
Electrical Conductivity ◽  
Liquid Phase ◽  
Flexural Strength ◽  
Carbon Fibers ◽  
Phenol Formaldehyde ◽  
Resin Content ◽  
Liquid Phase Oxidation ◽  
Bipolar Plates ◽  
Air Oxidation ◽  
Phase Oxidation

Composites of phenol formaldehyde (PF) resin/graphite reinforced by milled carbon fibers (MCFs) for bipolar plates are obtained by hot compression molding. The raw materials of the MCF particles, PF resin powder and graphite powder are simply dry powder ball milled and mixed. The effects of PF resin content and the content, granularity and surface treatment methods, such as air oxidation and Fenton/ultraviolet (UV) liquid-phase oxidation of MCFs on the electrical conductivity and flexural strength of the composites are measured by methods of four-point probe technique and three point flexural test, and the fracture patterns of the composites are analyzed by scanning electron microscope (SEM). The results indicate that the electrical conductivity decreases and flexural strength increases with the increase of PF resin content. Especially, the values of electrical conductivity and flexural strength can reach 165.28 S.cm-1 and 55.11MPa respectively when the PF resin content was 17% in weight. The properties of composites reinforced by air oxidation treated MCFs are better than those by liquid-phase oxidation treated one. The electrical conductivity and flexural strength of the composites are 208.12S.cm-1 and 57.44 MPa when they reinforced by 5% MCFs which treated by air oxidation at 450 . Compared with the nonreinfoced composites, the properties of reinforced composites increase 25.92% in electrical conductivity and 4.23% in flexural strength.

Slow large-scale supramolecular structuring as a cause of kinetic anomalies in the liquid-phase oxidation with nitric acid

2016 ◽  
Vol 65 (4) ◽  
pp. 984-992 ◽  
Author(s):  
G. V. Lagodzinskaya ◽  
T. V. Laptinskaya ◽  
A. I. Kazakov ◽  
L. S. Kurochkina ◽  
G. B. Manelis
Keyword(s):  
Nitric Acid ◽  
Liquid Phase ◽  
Large Scale ◽  
Liquid Phase Oxidation ◽  
Phase Oxidation

METHOD OF LIQUID-PHASE OXIDATION OF TOLUENE WITH NITRIC ACID IN A FLOW PACKED REACTOR

2017 ◽  
pp. 31-39
Author(s):  
R.A. Khrustalev ◽  
E.L. Belyaev ◽  
M. Yu. Berezkin ◽  
A.V. Pis'menskii ◽  
G.M. Komissarova ◽  
...  
Keyword(s):  
Nitric Acid ◽  
Liquid Phase ◽  
Liquid Phase Oxidation ◽  
Phase Oxidation

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.

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