Examining conductivity, current density, and sizings applied to carbon fibers during manufacture and their effect on fiber-to-matrix adhesion in epoxy polymers

2019 ◽  
Vol 179 ◽  
pp. 107494 ◽  
Author(s):  
Andreas Hendlmeier ◽  
Filip Stojcevski ◽  
Richard Alexander ◽  
Sunil Gupta ◽  
Luke C. Henderson
Keyword(s):  
Carbon Fibers ◽  
Current Density ◽  
Epoxy Polymers ◽  
Matrix Adhesion ◽  
Conductivity Current

Efficient Carbon Nanotube Field Emitter using Electrospun Carbon Nanofibers as a Flexible Electrode

2009 ◽  
Vol 1173 ◽  
Author(s):  
Hidetoshi Matsumoto ◽  
Kenichi Suzuki ◽  
Kazuma Tsuboi ◽  
Mie Minagawa ◽  
Akihiko Tanioka ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fibers ◽  
Current Density ◽  
Chemical Vapor ◽  
Light Sources ◽  
Flexible Electrode ◽  
Field Emitter ◽  
Field Emitter Arrays ◽  
Thin Carbon ◽  
Cnt Field Emitter

AbstractThermal-stable, conductive, and flexible carbon fabric (CF), which is composed of thin carbon fibers prepared by electrospinning, was used for the substrate of carbon nanotube (CNT) field emitter arrays. The field emitter arrays were prepared by chemical vapor deposition (CVD). The current density-electric field characteristics revealed that the CNT field emitter arrays on CF produced a higher current density at a lower turn-on voltage compared to ones on a Si substrate. This emitter integrated with a gate electrode based on hierarchy-structured carbon materials, CNTs on CF, can be used for light sources, displays, and other electronic devices.

scholarly journals Encapsulating Sulfur Into Nickel Decorated Hollow Carbon Fibers for High-Performance Lithium-Sulfur Batteries

2021 ◽  
Vol 8 ◽  
Author(s):  
Dongdong Yu ◽  
Zhihong Tang ◽  
Haiyong He
Keyword(s):  
Carbon Fibers ◽  
Current Density ◽  
Specific Capacity ◽  
Energy Storage Devices ◽  
Transport Channel ◽  
Nickel Particles ◽  
Study Results ◽  
Lithium Sulfur Batteries ◽  
Hollow Carbon ◽  
Lithium Sulfur

Due to the high specific energy density, lithium-sulfur batteries (LSBs) have great potential in energy storage devices for electric vehicle and electronic equipment. However, poor conductivity of sulfur, large volume expansion, and lithium polysulfide dissolution limit LSBs application and promotion. In this work, graphitic hollow carbon fibers (HCF) were fabricated as a matrix to encapsulate sulfur. And nickel particles were introduced into fibers (Ni@HCF) to improve the cycle stability of sulfur cathode. On one hand, hollow structures can encapsulate sulfur and limit lithium polysulfides dissolution, and the graphitic carbon walls can provide a fast electron transport channel. On the other hand, nickel particles can accelerate the conversion of lithium polysulfides. The study results show that the initial discharge specific capacity of Ni@HCF/S cathodes reaches 1,252 mAh g−1 at the current density of 0.1C. And the capacity can be maintained at 558 mAh g−1 after 200 cycles at the current density of 1C.

scholarly journals Multishot echo-planar MREIT for fast imaging of conductivity, current density, and electric field distributions

2017 ◽  
Vol 79 (1) ◽  
pp. 71-82 ◽  
Author(s):  
Munish Chauhan ◽  
Rohini Vidya Shankar ◽  
Neeta Ashok Kumar ◽  
Vikram D. Kodibagkar ◽  
Rosalind Sadleir
Keyword(s):  
Electric Field ◽  
Current Density ◽  
Fast Imaging ◽  
Field Distributions ◽  
Echo Planar ◽  
Conductivity Current

Reassembled Octatitanate/Carbon-Fiber Composites as High-Rate Lithium Insertion Electrode

2006 ◽  
Vol 45 ◽  
pp. 1890-1895
Author(s):  
Shinya Suzuki ◽  
Masaru Miyayama
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Current Density ◽  
Colloidal Suspension ◽  
Reversible Capacity ◽  
Fiber Composites ◽  
High Rate ◽  
Carbon Fiber Composites ◽  
Lithium Insertion ◽  
Small Current

Composites of octatitanate and carbon-fibers were prepared through reassembling tetratitanate nanosheets, synthesized through exfoliation / reassembly process, by the reaction with HCl in colloidal suspension mixed with carbon- fibers, followed by heat treatment. High-rate lithium intercalation properties were examined for the reassembled octatitanate / carbon-fiber composites, and compared with those of reassembled octatitanate simply mixed with carbon-particles. The reversible capacity and the energy efficiency of the reassembled octatitanate / carbon-fiber composites were 190 mAh/g and 94 %, respectively, larger than those of a conventional octatitanate or a reassembled octatitanate. Relatively large capacity of 135 mAh/g still remained at a large current density of 10 A/g, which corresponds to about 70 % of the discharge capacity at a relatively small current density of 100 mA/g. Reassembled octatitanate / carbon- fiber composites exhibited an excellent performance as a high-rate lithium insertion electrode.

Copper Plating on the Carbon Fibers by Double Pulse

2011 ◽  
Vol 148-149 ◽  
pp. 928-931 ◽  
Author(s):  
Song Gao ◽  
Ming Jie Fan ◽  
Gui Ping Wang
Keyword(s):  
Carbon Fibers ◽  
Current Density ◽  
Duty Cycle ◽  
Room Temperature ◽  
Fiber Surface ◽  
Copper Coating ◽  
Working Time ◽  
Technical Parameters ◽  
Gain Rate

The effects of positive and reverse working time, electroplating time, current density, duty cycle on the weight-gain rate were investigated. The optimized technical parameters were as follows: room temperature, 300 ms of positive working time, 30 ms of reverse working time, 40% of duty cycle, 8.20 ×10-5 A/mm2 of current density, 6 min of electroplating time. The quality of copper coating was checked with SEM. The adhesion between the coating and carbon fibers was tested by the method of psychro-thermal cycles. Additionally, comparison to pulse plating and direct current plating was made. The obtained results showed that a flat, detailed and well-crystalloid copper coating on the carbon fiber surface was obtained with the present conditions. The adhesion between the coating and carbon fibers was 450kPa.

The effect of curing schedules on fiber-matrix adhesion in carbon fiber–epoxy resin composites

2021 ◽  
pp. 002199832110604
Author(s):  
Luke ElKhoury ◽  
John C Berg
Keyword(s):  
Yield Strength ◽  
Carbon Fibers ◽  
Curing Temperature ◽  
Scanning Calorimetry ◽  
Degree Of Cure ◽  
Matrix Adhesion ◽  
Plastic Yield ◽  
Fiber Matrix ◽  
Fiber Fragmentation ◽  
Carbon Fiber Epoxy

Fiber-reinforced polymeric composites are used in a large and growing number of applications, all requiring different property sets including the nature of the fiber-matrix adhesion to which the present work is addressed. Specifically, the number of curing cycles, curing temperature and schedule, degree of cure, use of accelerants, annealing, and the use of fiber handling agents are investigated for systems of Hexcel IM7 carbon fibers embedded in Epon862 (resin) and Epikure Curing Agent W (hardener) using the single-fiber fragmentation method. The fractional extent of cure is monitored using differential scanning calorimetry (DSC), so that comparisons are made at the same degree of cure (99%). Single-stage curing at the highest temperature produces the highest apparent adhesion, and the use of accelerants significantly increases the curing rate while maintaining the same level of adhesion. Accelerants in some cases, however, decrease the plastic yield strength of the specimens. Annealing reduces induced residual stress and apparent adhesion, but not below the baseline achieved at lower curing temperatures. Plastic yield strength and apparent adhesion decrease for any degree of cure lower than 95%, while the use of handling agents shows no effect on adhesion.

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