Process optimization and microstructural analysis of aluminum based composite reinforced by multi-walled carbon nanotubes with various aspect ratios

2017 ◽  
Vol 48 (7) ◽  
pp. 719-725 ◽  
Author(s):  
A. H. Javadi ◽  
Sh. Mirdamadi ◽  
S. Shakhesi
Keyword(s):  
Carbon Nanotubes ◽  
Process Optimization ◽  
Microstructural Analysis ◽  
Aspect Ratios ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

DYNAMICAL PROPERTIES OF MULTI-WALLED CARBON NANOTUBES BASED ON A NONLOCAL ELASTICITY MODEL

2008 ◽  
Vol 22 (28) ◽  
pp. 4975-4986 ◽  
Author(s):  
Y. YAN ◽  
L. X. ZHANG ◽  
W. Q. WANG ◽  
X. Q. HE ◽  
C. M. WANG
Keyword(s):  
Carbon Nanotubes ◽  
Nonlocal Elasticity ◽  
Nonlocal Elasticity Theory ◽  
Length Scale ◽  
Small Length ◽  
Small Length Scale ◽  
Aspect Ratios ◽  
Multi Walled Carbon Nanotubes ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This paper investigates the free vibration of multi-walled carbon nanotubes (MWCNTs) with simply supported ends. Based on the nonlocal elasticity theory which allows the effects of small length scale and the more refined van der Waals (vdW) interaction formulas, the equation of motion is first derived and then solved analytically. The results reveal that the effects of the small length scale are significant for small aspect ratios and high radial vibration modes, and are instead insensitive to the number of layers of MWCNTs and weakly dependent on the wall thickness of MWNTs. This finding means that the effects of small length scale on complicated MWCNTs may be simplified to double-walled carbon nanotubes (DWCNTs) or even single-walled carbon nanotubes (SWCNTs).

scholarly journals Effect of Multi-Walled Carbon Nanotubes on Improving the Toughness of Reactive Powder Concrete

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2625 ◽  
Author(s):  
Jintao Liu ◽  
Hang Jin ◽  
Xin Zhao ◽  
Cheng Wang
Keyword(s):  
Carbon Nanotubes ◽  
Energy Absorption ◽  
Tensile Load ◽  
Microscopic Analysis ◽  
Reactive Powder Concrete ◽  
Aspect Ratios ◽  
Capability Indices ◽  
Multi Walled Carbon Nanotubes ◽  
Reactive Powder ◽  
Walled Carbon Nanotubes

Multi-walled carbon nanotubes (MWCNTs) have great potential to improve the strength and microstructure of traditional cement-based materials. In this research, different aspect ratios of MWCNTs (F-type and L-type) were dispersed into water using surfactants, and then incorporated into reactive powder concrete (RPC) for improving mechanical and microstructure properties. With the addition of 0.025 wt.% F-MWCNTs, the 28 days compressive strength and initial-cracking flexural strength increased by 7.2% and 36%, respectively. Moreover, the first-cracking tensile strengths of the composites containing L-MWCNTs were improved by 16%. Energy absorption capability indices were formulated based on tensile load–displacement curves, and results showed that the energy absorption capabilities of RPC at initial cracking improved as a result of the incorporation of MWCNTs. Furthermore, microscopic analysis indicated that MWCNTs decelerate crack development at the nanoscale and improve the initial-cracking tensile strength of RPC.

SMALL SCALE EFFECT ON THE FREE VIBRATION OF MULTI-WALLED CARBON NANOTUBES

2008 ◽  
Vol 22 (28) ◽  
pp. 2769-2777 ◽  
Author(s):  
Y. YAN ◽  
W. Q. WANG ◽  
L. X. ZHANG
Keyword(s):  
Carbon Nanotubes ◽  
Free Vibration ◽  
Scale Effect ◽  
Large Scale ◽  
Small Scale ◽  
Beam Model ◽  
Aspect Ratios ◽  
Small Scale Effect ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This paper is concerned with the free vibration of multi-walled carbon nanotubes (MWCNTs) with simply supported ends. Based on the non-local elasticity theory, Timoshenko beam model with the small scale effect and the van der Waals (vdW) interaction is derived and then solved analytically. The results reveal that the small scale effect is quite significant for small aspect ratios, large scale parameters and high radial vibration modes, whereas it is insensitive to the number of layers of MWCNTs and is weakly-dependent on the wall thickness of MWCNTs.

Processing and Consolidation of TaC/HfC Based Composites Using MoSi2 and Carbon Nanotubes

2012 ◽  
Vol 21 ◽  
pp. 145-150 ◽  
Author(s):  
F. Arianpour ◽  
Hamid Reza Rezaie ◽  
F. Golestani Fard ◽  
Gilbert Fantozzi ◽  
Mehdi Mazaheri
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Microstructural Analysis ◽  
Molybdenum Disilicide ◽  
Ultra High Temperature Ceramics ◽  
Multi Walled Carbon Nanotubes ◽  
Lower Temperature ◽  
Hafnium Carbides ◽  
Phase Characterization ◽  
Walled Carbon Nanotubes

Tantalum and hafnium carbides are classified as Ultra High Temperature Ceramics (UHTC) because of their extreme melting temperatures (above 3900°C). Therefore, these materials can safely operate in the range of temperature that any other materials could hardly exist. However, these applications can be strongly restricted due to (1) processing difficulties and (2) low fracture toughness. In this work, to address these two difficulties we have used two additives, which are multi-walled carbon nanotubes (CNTs) and molybdenum disilicide (MoSi2). The CNTs were added aimed to improve the fracture toughness of the composites, and the MoSi2to facilitate sintering. Application of such a sintering aid, add to the novel SPS technique, allowing quick processing at relatively lower temperature, results in (1) fully densified specimens (> 99%) and (2) well-surviving CNTs after sintering. Moreover, microstructural analysis points out fair-enough dispersion of the CNTs within the ceramics particles, in both the green and sintered bodies. Also the specimens phase characterization shows inter dissolution of TaC and HfC and formation of binary carbides solid solution.

Multi-walled Carbon Nanotubes Penetrate into Plant Cells and Affect the Growth of Onobrychis arenaria Seedlings

Acta Naturae ◽  
2011 ◽  
Vol 3 (1) ◽  
pp. 99-106 ◽  
Author(s):  
E A Smirnova ◽  
A A Gusev ◽  
O N Zaitseva ◽  
E M Lazareva ◽  
G E Onishchenko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Plant Cells ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes
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