Superior electrical, mechanical and viscoelastic properties of CNTs coated carbon textile reinforced phenolic composite for high‐performance structural applications

2020 ◽  
Vol 138 (10) ◽  
pp. 49968
Author(s):  
Ravindra Kumar ◽  
Kamal K. Kar ◽  
Kinshuk Dasgupta
Keyword(s):  
Viscoelastic Properties ◽  
High Performance ◽  
Structural Applications ◽  
Coated Carbon ◽  
Phenolic Composite

Oxygen-vacancy-rich TiO2-coated carbon nanofibers for fast sodium storage in high-performance sodium-ion hybrid capacitors

2021 ◽  
Vol 493 ◽  
pp. 229678
Author(s):  
Licong Huang ◽  
Linchao Zeng ◽  
Jianhui Zhu ◽  
Lingna Sun ◽  
Lei Yao ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Carbon Nanofibers ◽  
High Performance ◽  
Sodium Ion ◽  
Coated Carbon ◽  
Hybrid Capacitors ◽  
Sodium Storage

scholarly journals One-Pot Synthesis of Glucose-Derived Carbon Coated Ni3S2 Nanowires as a Battery-Type Electrode for High Performance Supercapacitors

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 678
Author(s):  
Zhongkai Wu ◽  
Haifu Huang ◽  
Wenhui Xiong ◽  
Shiming Yang ◽  
Huanhuan Huang ◽  
...  
Keyword(s):  
Carbon Source ◽  
High Performance ◽  
Specific Capacity ◽  
Rate Capability ◽  
One Pot ◽  
Great Performance ◽  
Carbon Coated ◽  
Binder Free ◽  
Coated Carbon ◽  
Supercapacitor Applications

We report a novel Ni3S2 carbon coated (denoted as NCC) rod-like structure prepared by a facile one-pot hydrothermal method and employ it as a binder free electrode in supercapacitor. We coated carbon with glucose as carbon source on the surface of samples and investigated the suitable glucose concentration. The as-obtained NCC rod-like structure demonstrated great performance with a huge specific capacity of 657 C g−1 at 1 A g−1, preeminent rate capability of 87.7% retention, the current density varying to 10 A g−1, and great cycling stability of 76.7% of its original value through 3500 cycles, which is superior to the properties of bare Ni3S2. The result presents a facile, general, viable strategy to constructing a high-performance material for the supercapacitor applications.

scholarly journals The Role of Sintering Additives on Synthesis of High Performance Ceramic- Matrix Composites (Cmcs) by Volume Combustion in The Tio2–Al–C System: Structural and Mechanical Properties

2019 ◽  
Vol 3 (2) ◽  
Keyword(s):  
High Performance ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Combustion Method ◽  
Lattice Parameter ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Sintering Additives ◽  
Structural Applications ◽  
Tic Particle

The purpose of this work is to decrease or eliminate porosities in ETE-VC products with sintering additives. The Ti–C system has been synthesized for its advantages for refractory, abrasive and structural applications. We attempted to density TiC by using iron addition; this metal is introduced through a secondary reaction 3TiO3 +Al. This mixture reacts exothermically ϪH298= -1072.7 kJ and the heat is released according to by Fe addition 3TiO3 +4Al+3C+xFe→3TiC+2Al2 O3 +xFe. X-ray diffraction analysis indicated that intermetallic Fe3 Al, TiC and Al2 O3 are the main phases formed in the reinforced high performance ceramic-matrix composites and the additions of Fe decreased the lattice parameter of TiC. Field emission scanning electron microscopy examinations showed that the addition of Fe decreased TiC particle size and changed their growth controlling mechanism. Also, Raman spectroscopy analysis showed that at higher Fe contents, oxygen dissolved in the TiC crystal structure leading to the formation of titanium oxy-carbide with lower lattice parameter and residual un-reacted carbon in the products. The adiabatic temperatures for the reactions containing % Fe estimated using the thermodynamic data. Thus, doping method is finally used to fabricate materials by ETE-VC method (volume combustion method) for industriel applications.

scholarly journals Numerical Simulation of the Fracture Behaviour of High-Performance Fibre Reinforced Concrete by Using a Cohesive-Crack-Based Inverse Analysis

2021 ◽  
Author(s):  
Alejandro Enfedaque ◽  
Marcos G. Alberti ◽  
Jaime C. Gálvez ◽  
Pedro Cabanas
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Inverse Analysis ◽  
High Performance ◽  
Fracture Behaviour ◽  
Constitutive Models ◽  
Cohesive Crack ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
Structural Applications

Fibre reinforced concrete (FRC) has become an alternative for structural applications due its outstanding mechanical properties. The appearance of new types of fibres and the fibre cocktails that can be configured mixing them has created FRC that clearly exceed the minimum mechanical properties required in the standards. Consequently, in order to take full advantage of the contribution of the fibres in construction projects, it is of great interest to have constitutive models that simulate the behaviour of the materials. This study aimed to simulate the fracture behaviour of five types of FRC, three with steel hooked fibres, one with a combination of two types of steel fibres and one with a combination of polyolefin fibres and two types of steel fibres, by means of an inverse analysis based on the cohesive crack approach. The results of the numerical simulations defined the softening functions of each FRC formulation and have pointed out the synergies that are created through use of fibre cocktails. The information obtained might suppose a remarkable advance for designers using high-performance FRC in structural elements.

A double-layered Ge/carbon cloth integrated anode for high performance lithium ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63414-63417 ◽  
Author(s):  
Xiaohong Zhang ◽  
Shimou Chen ◽  
Jia Yu ◽  
Daliang Fang ◽  
Suojiang Zhang
Keyword(s):  
Lithium Ion Batteries ◽  
High Performance ◽  
Lithium Ion ◽  
Carbon Cloth ◽  
Promising Application ◽  
Integrated Anode ◽  
Coated Carbon

A double-layered Ge coated carbon cloth composite as integrated electrode shows promising application in flexible lithium ion batteries.

Recent Advances in Morphology and Mechanical Properties of Rigid-Rod Molecular Composites

1989 ◽  
Vol 171 ◽  
Author(s):  
Stephen J. Krause ◽  
Wen-Fang Hwang
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Low Voltage ◽  
Orientation Distribution ◽  
Short Fiber ◽  
Chain Polymer ◽  
Structural Applications ◽  
Molecular Composites ◽  
Rigid Rod ◽  
Aromatic Heterocyclic

ABSTRACTRigid-rod molecular composites are a new class of high performance structural polymers which have high specific strength and modulus and also high thermal and environmental resistance. The concept of using a rigid-rod, extended chain polymer to reinforce a ductile polymer matrix at the molecular level has been demonstrated with morphological and mechanical property studies for aromatic heterocyclic systems, but new materials systems and processing techniques will be required to produce thermoplastic or thermoset molecular composites. Improved characterization and modeling will also be required. In this regard, new results on modeling of mechanical properties of molecular composites are presented and compared with experimental results. The Halpin-Tsai equations from ‘shear-lag’ theory of short fiber composites predict properties reasonably well when using the theoretical modulus of rigid-rod molecules in aromatic heterocyclic systems, but newer matrix systems will require consideration of matrix stiffness, desired rod aspect ratio, and rod orientation distribution. Application of traditional and newer morphological characterization techniques are discussed. The newer techniques include: Raman light scattering, high resolution and low voltage SEM, parallel EELS in TEM, synchrotron radiation in X-ray scattering, and ultrasound for integrity studies. The properties of molecular composites and macroscopic composites are compared and it is found that excellent potential exists for use of molecular composites in structural applications including engineering plastics, composite matrix resins, and as direct substitutes for fiber reinforced composites.

WETTING SIMULATIONS OF HIGH-PERFORMANCE POLYMER RESINS ON CARBON NANOTUBE SURFACES USING MOLECULAR DYNAMICS

2021 ◽  
Author(s):  
SWAPNIL BAMANE ◽  
PRASHIK GAIKWAD ◽  
MATTHEW RADUE ◽  
S. GOWTHAM ◽  
GREGORY ODEGARD
Keyword(s):  
Molecular Dynamics ◽  
Contact Angle ◽  
Carbon Nanotube ◽  
High Performance ◽  
Material Design ◽  
High Performance Polymer ◽  
Wide Range ◽  
Structural Applications ◽  
Aliphatic Carbon ◽  
Key Parameter

There is a wide application of carbon nanotube (CNT) based composite materials for structural applications in the aerospace industry. CNT composites are often manufactured with high performance polymer resins as a matrix. Resin wettability with specific reinforcement types is a key parameter in manufacturing CNT composites. Wettability of a liquid resin and reinforcement combination is often measured and quantified by the contact angle. Various experimental methods have been developed to determine the contact angle which can be expensive while working with high-performance resins and CNT materials such as CNT yarns, bundles, or forests. Fortunately, computational simulations can greatly facilitate CNT composite material design by efficiently predicting the contact angle for a wide range of resins. In this study, a molecular dynamics (MD) framework is developed to determine the contact angle value of high-performance polymer resins on aromatic and aliphatic carbon surfaces (Figure 1). It is determined that monomer length and functional groups have a significant impact on the contact angle. Further, based on these results, qualitative deductions of contact angle values of highperformance resins on CNT materials with amorphous carbon content are made.

Study on Mechanical Properties of AA6061/SiC/B4C Hybrid Nano Metal Matrix Composites

2021 ◽  
Vol 1034 ◽  
pp. 35-42
Author(s):  
Shubhajit Das ◽  
M. Chandrasekaran ◽  
Sutanu Samanta
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Matrix Material ◽  
Average Particle Size ◽  
Volume Ratio ◽  
Casting Process ◽  
Hybrid Nanocomposites ◽  
Average Particle ◽  
Matrix Composites ◽  
Structural Applications

The present work investigates the mechanical characterization of aluminium alloy (AA) 6061 based hybrid nanometal matrix composites (MMCs) fabricated using conventional stir casting process. Two compositions viz., AA6061+1.5 wt.% B4C+0.5 wt.% SiC (Hybrid A) and AA6061+1.5 wt.% B4C+1.5 wt.% SiC (Hybrid B) was prepared and its mechanical properties such as microhardness, tensile, compressive, flexural and impact strength were investigated to compare with unreinforced AA6061. SiC and B4C ceramic particles (purity 99.89%) of average particle size of 50 nm were used as reinforcements. Significant enhancement in microhardness of 30.2% and 31.02% for hybrid A and B are observed respectively. The ultimate tensile strength (UTS) increased by 10.72% and 16.55% for hybrid A and B respectively. Improved interaction because of the enhanced surface to volume ratio at the interface resulted in improvement of mechanical properties. Field emission scanning electron microscopy (FESEM) of the fractured surface shows brittle fracture because of the incorporation of the ceramic reinforcements in the matrix material. The developed AA6061/SiC/B­4C hybrid nanocomposites show improved mechanical properties for high-performance structural applications.

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