scholarly journals Room-Temperature Self-Healable and Mechanically Robust Thermoset Polymers for Healing Delamination and Recycling Carbon Fibers

2021 ◽  
Author(s):  
Xiaming Feng ◽  
Guoqiang Li
Keyword(s):  
Carbon Fibers ◽  
Room Temperature ◽  
Thermoset Polymers

Reduction of Lower Concentration NO with Ammonia at Room Temperature over Pitch Based Active Carbon Fibers Calcined and Further Activated with Sulfuric Acid.

1996 ◽  
Vol 39 (2) ◽  
pp. 151-157 ◽  
Author(s):  
Isao MOCHIDA ◽  
Yuji KAWABUCHI ◽  
Motohiro HIRONAKA ◽  
Shizuo KAWANO ◽  
Yuji MATSUMURA ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Carbon Fibers ◽  
Active Carbon ◽  
Room Temperature

scholarly journals Photoconductivity of activated carbon fibers

1991 ◽  
Vol 6 (5) ◽  
pp. 1040-1047 ◽  
Author(s):  
K. Kuriyama ◽  
M.S. Dresselhaus
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Low Temperatures ◽  
Room Temperature ◽  
High Surface ◽  
Localized States ◽  
Activated Carbon Fibers ◽  
Disordered Carbon ◽  
Increasing Temperature

The conductivity and photoconductivity are measured on a high-surface-area disordered carbon material, i.e., activated carbon fibers, to investigate their electronic properties. This material is a highly disordered carbon derived from a phenolic precursor, having a huge specific surface area of 1000–2000 m2/g. Our preliminary thermopower measurements show that the dominant carriers are holes at room temperature. The x-ray diffraction pattern reveals that the microstructure is amorphous-like with Lc ≃ 10 Å. The intrinsic electrical conductivity, on the order of 20 S/cm at room temperature, increases by a factor of several with increasing temperature in the range 30–290 K. In contrast, the photoconductivity in vacuum decreases with increasing temperature. The magnitude of the photoconductive signal was reduced by a factor of ten when the sample was exposed to air. The recombination kinetics changes from a monomolecular process at room temperature to a bimolecular process at low temperatures, indicative of an increase in the photocarrier density at low temperatures. The high density of localized states, which limits the motion of carriers and results in a slow recombination process, is responsible for the observed photoconductivity.

scholarly journals Activated carbon fibers loaded with MnO2 for removing NO at room temperature

2014 ◽  
Vol 256 ◽  
pp. 101-106 ◽  
Author(s):  
Mingxi Wang ◽  
Henian Liu ◽  
Zheng-Hong Huang ◽  
Feiyu Kang
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Room Temperature ◽  
Activated Carbon Fibers

ESR study of activated carbon fibers: preliminary results

1993 ◽  
Vol 8 (9) ◽  
pp. 2282-2287 ◽  
Author(s):  
S.L. di Vittorio ◽  
A. Nakayama ◽  
T. Enoki ◽  
M.S. Dresselhaus ◽  
M. Endo ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Carbon Fibers ◽  
Room Temperature ◽  
Broad Peak ◽  
Activated Carbon Fibers ◽  
Temperature Peak ◽  
Dangling Bond ◽  
Surface Areas ◽  
Spin Resonance

We have carried out Electron Spin Resonance (ESR) measurements on activated carbon fibers (ACF) with specific surface areas (SSA) of 3000 and 2000 m2/g. The ESR spectrum of ACF fibers in air is extremely broad (500 to 1000 Gauss), and the spin susceptibility decreases rapidly with decreasing specific surface area. Also measured was the ESR signal of the desorbed fibers in vacuum. As a result of desorption, the broad peak decreases slightly in intensity, and a narrow (≍65 Gauss at room temperature) peak appears. We report results on the temperature dependence of both peaks. The narrow peak is interpreted as due to spins associated with dangling bonds, whereas we attribute the broad peak to the conduction carrier spins which is broadened by the boundary scattering process (T1 contribution) and the dipolar broadening process (T2 contribution) associated with the dangling bond spins.

Hydrogen storage by platelet-carbon fibers at room temperature

2002 ◽  
Vol 57 (1) ◽  
pp. 32-35 ◽  
Author(s):  
Hongwei Zhu ◽  
Chunhua Li ◽  
Xuesong Li ◽  
Cailu Xu ◽  
Zongqiang Mao ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Carbon Fibers ◽  
Room Temperature

PEEK- and PTFE- Based Composites for Tribology Applications in a Range between Liquid Helium and Room Temperature

2007 ◽  
Vol 334-335 ◽  
pp. 597-600
Author(s):  
Klaus Friedrich ◽  
Patrick Klein ◽  
Geraldine Theiler ◽  
Lin Ye ◽  
Yiu Wing Mai
Keyword(s):  
Wear Resistance ◽  
Carbon Fibers ◽  
Wide Temperature Range ◽  
Room Temperature ◽  
Extreme Environments ◽  
Short Fiber ◽  
Low Friction ◽  
Wear Performance ◽  
Polymer Component ◽  
Low Wear

This study deals with the development of PEEK (polyetheretherketone) and PTFE (polytetrafluoroethylene) based composites, optimized for low friction and low wear performance under extreme environments. It is demonstrated that the incorporation of a harder polymer component into PTFE (such as PEEK particles), a short fiber reinforcement (e.g. carbon fibers CF), and internal lubricants (e.g. PTFE particles), helps to reduce the friction and to improve the wear resistance over a very wide temperature range.

Electrical properties of plastic composites using Br2-intercalated vapor-grown carbon fibers as a conductive filler

1994 ◽  
Vol 9 (7) ◽  
pp. 1829-1833 ◽  
Author(s):  
M. Katsumata ◽  
M. Endo ◽  
H. Yamanashi ◽  
H. Ushijima
Keyword(s):  
Electrical Properties ◽  
Carbon Fibers ◽  
Room Temperature ◽  
Conductive Filler ◽  
Plastic Composite ◽  
Plastic Composites ◽  
Liquid Bromine ◽  
Degree Of Stability ◽  
High Degree ◽  
Powder Resistivity

Graphite fiber intercalation compounds were prepared by immersing graphitized thin vapor-grown carbon fibers (VGCF's) with diameters less than 0.5 μm into liquid bromine. The composition of Br2-intercalated VGCF was C70Br-C90Br. The powder resistivity of Br2-intercalated VGCF was estimated as 1/3 of pristine VGCF. An electroconductive plastic composite was prepared by mixing phenol resin with that of bromine intercalated VGCF as a conductive filler, and its electrical properties were investigated. The resistivity of a Br2-intercalated VGCF composite was 1.1 × 10−2 Ω · cm at room temperature, which is about 50% of pristine VGCF composite. Br2-intercalated VGCF-based composite had a high degree of stability against exposure at 150 °C in air and at 85 °C with 90% humidity for 500 h. Br2-intercalated VGCF-based plastic composites could be used as highly electroconductive materials.

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