Reinforcement role of carbon nanotubes, Part I: High‐performance epoxy resin

2014 ◽  
Vol 36 (12) ◽  
pp. 2212-2219 ◽  
Author(s):  
Min Ya ◽  
Ryszard Pyrz
Keyword(s):  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
High Performance

Role of Well-Dispersed Carbon Nanotubes and Limited Matrix Degradation on Tribological Properties of Flame-Sprayed PEEK Nanocomposite Coatings

2021 ◽  
Vol 144 (1) ◽  
Author(s):  
Yupeng Li ◽  
Zhiqiang Man ◽  
Xinyu Lin ◽  
Lai Wei ◽  
Haonan Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Tribological Properties ◽  
High Performance ◽  
Fatigue Cracks ◽  
Nanocomposite Coatings ◽  
Flame Spraying ◽  
Crystallinity Degree ◽  
Polyether Ether Ketone ◽  
Low Solubility

Abstract High-performance carbon nanotubes reinforced polyether ether ketone (CNTs/PEEK) nanocomposites display an excellent combination of mechanical, thermal, and tribological properties. It is a challenge to deposit high-performance CNTs/PEEK nanocomposite coatings via the coating techniques based on solution or melting processes due to low solubility and high melting point of PEEK for tribological applications. In this work, the CNTs/PEEK nanocomposite coatings with CNTs contents of 0.1, 0.5, 1.0, and 2.0 wt% were prepared by flame spraying of mixed PEEK and CNTs powders using mechanical blending (MB) and ultrasound dispersion (UD) methods. The flame-sprayed CNTs/PEEK nanocomposite coatings using UD powders preserved good CNTs dispersion, low porosity, and surface roughness, adhesive coating–substrate interfaces. The thermal degradation of PEEK ascribed to overheating of in-flight particles and flame-rescanning coatings was limited by good CNTs dispersion in flame-sprayed CNTs/PEEK nanocomposite coatings with an increase of CNT contents. The good dispersion of CNTs aided in initiating crystallization and confined crystalline growth resulting in high crystallinity degree and small crystallite size of PEEK matrix in the flame-sprayed CNTs/PEEK nanocomposite coatings. The uniform nanocomposite coatings with well-dispersed CNTs and few PEEK degradation in optimum content of 1.0 wt% preserved enhanced microhardness and superiorly tribological properties. The well-dispersed CNTs bonding with PEEK matrix enhanced the mechanical strength to restrict the generation of fatigue cracks from defects of voids, which promoted self-lubrication and wear resistance of flame-sprayed CNTs/PEEK nanocomposite coatings.

scholarly journals The role of carbon nanotubes in enhanced charge storage performance of VSe2: experimental and theoretical insight from DFT simulations

RSC Advances ◽  
2020 ◽  
Vol 10 (53) ◽  
pp. 31712-31719
Author(s):  
Sree Raj K. A. ◽  
Afsal S. Shajahan ◽  
Brahmananda Chakraborty ◽  
Chandra Sekhar Rout
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Hybrid Structure ◽  
Charge Storage ◽  
Multiwalled Carbon ◽  
Storage Performance ◽  
Dft Simulations ◽  
Supercapacitor Applications ◽  
Theoretical Insight

Hybrid structure of VSe2 and multiwalled carbon nanotube for high performance supercapacitor applications.

scholarly journals Flame Retardancy of Carbon Nanotubes Reinforced Carbon Fiber/Epoxy Resin Composites

2019 ◽  
Vol 9 (16) ◽  
pp. 3275 ◽  
Author(s):  
Guo-qiang Chai ◽  
Guo-qing Zhu ◽  
Yunji Gao ◽  
Jinju Zhou ◽  
Shuai Gao
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Carbon Fiber ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
High Performance ◽  
Decomposition Temperature ◽  
Cone Calorimetry ◽  
Initial Decomposition Temperature ◽  
Solution Blending

In order to study the effect of carbon nanotubes (CNTs) on the flame retardancy of carbon fiber (CF)/epoxy resin (EP) composites, CF/EP and CNTs/CF/EP composites were prepared by solution blending. The flame retardancy and thermal stability were studied by cone calorimetry and thermogravimetric analysis. It was found that CNTs and CF had a certain synergistic effect on improving flame retardancy and thermal stability of EP. The peak heat release rate of F7N7, which represents the EP composites with 0.7 wt % CF and 0.7 wt % CNTs, was minimal. The total smoke production of F5N5 which represents the EP composites with 0.5 wt % CF and 0.5 wt % CNTs was the smallest, which was decreased by 43.04% more than the EP. The initial decomposition temperature of F7N7 was about 14 °C higher than that of F7, and the mass loss at Tmax was greatly reduced. The apparent activation energy of F7N7 is 2.7 kJ·mol−1 more than EP. Finally, the tensile and flexural strength of the composites were also improved, so it could be applied to a high-performance matrix of CF/EP composites, which are usually used as the advanced composites in the aerospace field.

Enhancement in mechanical properties and conductivity of modified epoxy resin composites

2017 ◽  
Vol 30 (10) ◽  
pp. 1169-1182 ◽  
Author(s):  
Changlong Bi ◽  
Dongyu Zhao
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Mechanical Analysis ◽  
Polymer Materials ◽  
Multiwalled Carbon ◽  
Ep Matrix

Nanosilver and nanonickel were first loaded on the surfaces of multiwalled carbon nanotubes (MWCNTs) by liquid-phase reduction method and the multiwalled carbon nanotubes/nanosilver-nickel (MWCNTs/Ag-Ni) composites were formed. The MWCNTs/Ag-Ni were homogeneously dispersed in the epoxy resin (EP), which can form epoxy resin/multiwalled carbon nanotubes/nanosilver-nickel (EP/MWCNTs/Ag-Ni) composites. The results based on X-ray photoelectron spectroscopy show the chemical bonds in the MWCNTs/Ag-Ni. By the scanning electron microscope method, it can be concluded that the enhancement in mechanical properties is due to the strong interaction between MWCNTs and the EP matrix. It is proved that through the comparative tests, the addition of nanosliver-nickel rigid particles can enhance the interaction between MWCNTs and the EP matrix, which can improve the mechanical properties of modified EP. Compared with the pure EP, the tensile strength and impact strength of nanocomposites improve around 81% and 139% by adding 1.3 wt% MWCNTs/Ag-Ni. In addition, the experimental results based on dynamic mechanical analysis (DMA) show that the glass transition temperature of modified EP (1.3 wt% MWCNTs/Ag-Ni in EP matrix) is significantly increased by about 18.6°C. Compared with the pure EP, the conductivity of modified EP (1.3 wt% MWCNTs/Ag-Ni in EP matrix) is also increased by around 63%. Because of the excellent mechanical properties and conductivity of EP/MWCNTs/Ag-Ni nanocomposites, the development of high-performance polymer materials will be greatly achieved.

Glass transition temperature of amino groups grafted carbon nanotubes reinforced epoxy resin composites: Role of strong interphase

2017 ◽  
Vol 39 (S2) ◽  
pp. E1129-E1138 ◽  
Author(s):  
Cai Jiang ◽  
Dazhi Jiang ◽  
Jianwei Zhang ◽  
Shaofeng Lin ◽  
Xinlong Shang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Epoxy Resin ◽  
Resin Composites ◽  
Amino Groups ◽  
Epoxy Resin Composites

Role of HF in Oxygen Removal from Carbon Nanotubes: Implications for High Performance Carbon Electronics

Nano Letters ◽  
2014 ◽  
Vol 14 (11) ◽  
pp. 6179-6184 ◽  
Author(s):  
Xiaokai Li ◽  
Jing-Shun Huang ◽  
Siamak Nejati ◽  
Lyndsey McMillon ◽  
Su Huang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Oxygen Removal ◽  
Carbon Electronics

Trace nanoanalysis

1994 ◽  
Vol 52 ◽  
pp. 940-941
Author(s):  
D. E. Newbury ◽  
R. D. Leapman
Keyword(s):  
High Performance ◽  
Secondary Ion Mass Spectrometry ◽  
Detection Efficiency ◽  
Volume Element ◽  
And Performance ◽  
Trace Constituents ◽  
Secondary Ion ◽  
Concentration Levels ◽  
Structure Properties

Trace constituents, which can be very loosely defined as those present at concentration levels below 1 percent, often exert influence on structure, properties, and performance far greater than what might be estimated from their proportion alone. Defining the role of trace constituents in the microstructure, or indeed even determining their location, makes great demands on the available array of microanalytical tools. These demands become increasingly more challenging as the dimensions of the volume element to be probed become smaller. For example, a cubic volume element of silicon with an edge dimension of 1 micrometer contains approximately 5×1010 atoms. High performance secondary ion mass spectrometry (SIMS) can be used to measure trace constituents to levels of hundreds of parts per billion from such a volume element (e. g., detection of at least 100 atoms to give 10% reproducibility with an overall detection efficiency of 1%, considering ionization, transmission, and counting).

Two Short Tests Fail to Detect Vigilance Decrements

2001 ◽  
Vol 17 (1) ◽  
pp. 48-55 ◽  
Author(s):  
Juan Botella ◽  
María José Contreras ◽  
Pei-Chun Shih ◽  
Víctor Rubio
Keyword(s):  
Individual Differences ◽  
High Performance ◽  
Selection Process ◽  
Vigilance Task ◽  
Air Traffic Controllers ◽  
Job Selection ◽  
Performance Deterioration ◽  
Short Test ◽  
Psychological Dimensions

Summary: Deterioration in performance associated with decreased ability to sustain attention may be found in long and tedious task sessions. The necessity for assessing a number of psychological dimensions in a single session often demands “short” tests capable of assessing individual differences in abilities such as vigilance and maintenance of high performance levels. In the present paper two tasks were selected as candidates for playing this role, the Abbreviated Vigilance Task (AVT) by Temple, Warm, Dember, LaGrange and Matthews (1996) and the Continuous Attention Test (CAT) by Tiplady (1992) . However, when applied to a sample of 829 candidates in a job-selection process for air-traffic controllers, neither of them showed discriminative capacity. In a second study, an extended version of the CAT was applied to a similar sample of 667 subjects, but also proved incapable of properly detecting individual differences. In short, at least in a selection context such as that studied here, neither of the tasks appeared appropriate for playing the role of a “short” test for discriminating individual differences in performance deterioration in sustained attention.

Sign in / Sign up

Export Citation Format

Share Document