scholarly journals Toxicity determinants of multi-walled carbon nanotubes: The relationship between functionalization and agglomeration

2016 ◽  
Vol 3 ◽  
pp. 230-243 ◽  
Author(s):  
Manfredi Allegri ◽  
Dimitrios K. Perivoliotis ◽  
Massimiliano G. Bianchi ◽  
Martina Chiu ◽  
Alessandra Pagliaro ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
The Relationship

The relationship between the diameter of chemically-functionalized multi-walled carbon nanotubes and their organ biodistribution profiles in vivo

Biomaterials ◽  
2014 ◽  
Vol 35 (35) ◽  
pp. 9517-9528 ◽  
Author(s):  
Julie T-W. Wang ◽  
Chiara Fabbro ◽  
Enrica Venturelli ◽  
Cécilia Ménard-Moyon ◽  
Olivier Chaloin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
The Relationship

scholarly journals Analysis of the Piezoelectric Properties of Aligned Multi-Walled Carbon Nanotubes

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2912
Author(s):  
Marina V. Il’ina ◽  
Oleg I. Il’in ◽  
Nikolay N. Rudyk ◽  
Olga I. Osotova ◽  
Alexander A. Fedotov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Sheet ◽  
Carbon Nanostructures ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Sheet Surface ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
The Relationship

Recent studies reveal that carbon nanostructures show anomalous piezoelectric properties when the central symmetry of their structure is violated. Particular focus is given to carbon nanotubes (CNTs) with initial significant curvature of the graphene sheet surface, which leads to an asymmetric redistribution of the electron density. This paper presents the results of studies on the piezoelectric properties of aligned multi-walled CNTs. An original technique for evaluating the effective piezoelectric coefficient of CNTs is presented. For the first time, in this study, we investigate the influence of the growth temperature and thickness of the catalytic Ni layer on the value of the piezoelectric coefficient of CNTs. We establish the relationship between the effective piezoelectric coefficient of CNTs and their defectiveness and diameter, which determines the curvature of the graphene sheet surface. The calculated values of the effective piezoelectric coefficient of CNTs are shown to be between 0.019 and 0.413 C/m2, depending on the degree of their defectiveness and diameter.

Molecular Dynamics Simulation on the Tension Deformation of Carbon Nanotubes

2011 ◽  
Vol 697-698 ◽  
pp. 487-490
Author(s):  
M.Y. Zhou ◽  
Yan Ling Tian ◽  
Z. Ren ◽  
H.Y. Zheng ◽  
R.B. Wei
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Single Walled Carbon Nanotubes ◽  
Md Simulations ◽  
Dynamics Simulation ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
The Relationship

Molecular dynamics (MD) simulations were used to investigate the elastic properties of carbon nanotubes (CNTs). Displacements were loaded to CNTs on the tension deformation simulations. In order to better understand the relationship between Young’s modulus and the structure of the CNTs, different chiralities and diameters were involved. It is found that the Young’s modulus will be no more sensitive as in the single-walled carbon nanotubes (SWCNTs) with increasing walls. The tension deformation results also indicate that SWCNTs have better elastic property compared to multi-walled carbon nanotubes (MWCNTs).

scholarly journals Properties of MWCNTs added Si3N4 composites processed from oxidized silicon nitride powders

2020 ◽  
Vol 14 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Awais Qadir ◽  
Katalin Balazsi ◽  
Csaba Balazsi ◽  
Michal Ivor ◽  
Jan Dusza
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Hot Isostatic Pressing ◽  
Oxide Phase ◽  
Ambient Air ◽  
Oxide Phases ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
The Relationship

Si3N4/3wt.% multi-walled carbon nanotubes (MWCNTs) composites were prepared from oxidized ?-Si3N4 powders and sintering additives by hot isostatic pressing (HIP). The Si3N4 powders were oxidized at 1000?C in ambient air environment for 10 and 20 h and the powder mixture was sintered at 1700?C for 3 h under the pressure of 20MPa in nitrogen. The relationship between oxidation, microstructure, tribology and mechanical properties was studied. The dispersion of MWCNTs was not optimal, as they were found mainly in the form of bundles between the ?-Si3N4 grains. Neither Si2N2O nor other oxide phase were observed after the sintering. This was probably caused by the presence of MWCNTs at the grain boundaries of the Si3N4 grains causing reduction of oxide phases. The density, hardness, bending strengths and friction coefficient of the composites increased with the oxidation time of the Si3N4 powder.

Void characteristics and mechanical strength of cementitious mortars containing multi-walled carbon nanotubes

2019 ◽  
Vol 54 (17) ◽  
pp. 2283-2295
Author(s):  
Arash Sedaghatdoost ◽  
Kiachehr Behfarnia ◽  
Ali Hendi ◽  
Mohammad Bayati
Keyword(s):  
Carbon Nanotubes ◽  
Flexural Strength ◽  
Mechanical Strength ◽  
Optimum Dosage ◽  
Cement Mortars ◽  
Multi Walled Carbon Nanotubes ◽  
Void Shape ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
The Relationship

In this paper, the relationship between mechanical strength and void characteristics including porosity, the mean area of voids (MAV), and circularity was determined for the first time by analyzing the petrographic images of some cement mortars containing multi-walled carbon nanotubes (MWCNTs). The results showed that the compressive, tensile, and flexural strength for specimens containing 0.1% MWCNTs (optimum dosage of MWCNT) were 21, 12.5, and 9.5% more than that of the control samples, respectively. Also, it was shown that the application of MWCNTs can change the shape and the amount of voids, thereby imposing a significant impact on the mortar behavior. For the optimum dosage of MWCNTs, the porosity and MAV decreased about 63 and 71%, respectively, while the circularity enhanced 23% in comparison with the ordinary mortar samples. The void shape is one of the reasons for the enhanced properties of the MWCNT mortars. The image processing of the petrographic specimens and probability theorization revealed that the circularity of the voids had a significant impact on the flexural strength of the mortars, while the compressive strength was mostly affected by only the amount of porosity.

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

Incorporation of Multi Wall Carbon Nanotubes into Glass-Surfaces via Laser-Treatment

2003 ◽  
Vol 772 ◽  
Author(s):  
T. Seeger ◽  
G. de la Fuente ◽  
W.K. Maser ◽  
A.M. Benito ◽  
A. Righi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Continuous Wave ◽  
Silica Surface ◽  
Multi Wall Carbon Nanotubes ◽  
Composite Formation ◽  
Multi Walled Carbon Nanotubes ◽  
Glass Surfaces ◽  
Walled Carbon Nanotubes ◽  
First Time ◽  
Scanning Electron

AbstractCarbon nanotubes (CNT) are interesting candidates for the reinforcement in robust composites and for conducting fillers in polymers due to their fascinating electronic and mechanical properties. For the first time, we report the incorporation of multi walled carbon nanotubes (MWNTs) into silica-glass surfaces by means of partial surface-melting caused by a continuous wave Nd:YAG laser. MWNTs were detected being well incorporated in the silica-surface. The composites are characterized using scanning electron microscopy (SEM) and Raman-spectroscopy. A model for the composite-formation is proposed based on heatabsorption by MWNTs and a partial melting of the silica-surface.

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