Rolling and Sliding Resistance as Carbon Nanotubes are Driven on a Graphene Sheet

2020 ◽  
pp. 27-39
Author(s):  
Avirup Sircar ◽  
Puneet Kumar Patra
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Sheet ◽  
Sliding Resistance

Co/Co9S8@carbon nanotubes on a carbon sheet: facile controlled synthesis, and application to electrocatalysis in oxygen reduction/oxygen evolution reactions, and to a rechargeable Zn-air battery

2021 ◽  
Author(s):  
Han-Ming Zhang ◽  
Chunyan Hu ◽  
Muwei Ji ◽  
Minjie Wang ◽  
Jiali Yu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction ◽  
Graphene Sheet ◽  
Oxygen Evolution ◽  
Controlled Synthesis ◽  
Porous Graphene ◽  
Carbon Sheet ◽  
Air Battery

A facile strategy to fabricate Co/Co9S8 nanoparticles-encapsulated in carbon nanotubes, on an N-doped porous graphene sheet (Co/Co9S8@CNTs) via pyrolysis of a mixture of Co(NO3)2, melamine and l-cysteine is reported.

The Effects of Inoculum in Fermented Glutinous Rice for Nanotechnology Applications

2013 ◽  
Vol 667 ◽  
pp. 277-280 ◽  
Author(s):  
S.F. Nik ◽  
N.F.A. Zainal ◽  
A.A. Azira ◽  
F. Mohamed ◽  
Saifollah Abdullah ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Infrared Spectroscopy ◽  
Graphene Sheet ◽  
Nanostructured Materials ◽  
Glucose Level ◽  
Starting Material ◽  
Optimum Amount ◽  
New Approach ◽  
Glutinous Rice

Carbon nanotubes (CNTs) were unique nanostructured materials composed of single or multiple rolled graphene sheet which usually need expensive sources as a starting material in its preparation. In this paper, new approach of starting material was expected to be commercialized due to its cheaper and renewable properties. Fermented glutinous rice would be optimized before it can be used as starting material in the CNTs preparation. In optimizing the process, a few parameters were considered. One of the important parameters was the amount of inoculums; known as ‘ragi’. This paper showed the effect of inoculums using Fourier Transmission Infrared Spectroscopy (FTIR). The amount was varies depending on percentage of glutinous rice used in the process. The optimum amount of inoculums for nanotechnology application was 3.0% (w/w) of glutinous rice due to the most favorable level of glucose and alcohol after 3 days fermentation. The glucose level decreased whereas alcohol yield was raised when higher inoculums amount were used. The result suggested that sample with inoculums amount of 3.0% (w/w) glutinous rice was the best starting material for nanotechnology application.

Water-mediated curvature change in graphene by single-walled carbon nanotubes

2018 ◽  
Vol 20 (34) ◽  
pp. 22359-22367 ◽  
Author(s):  
Hrushikesh M. Gade ◽  
Piyush P. Wanjari ◽  
Srihas V. V. Velpuri
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Graphene Sheet ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Multi Walled Carbon Nanotube ◽  
Walled Carbon Nanotubes

Simulations showing water-mediated nanotube-induced curvature change within a compatible graphene sheet resulting in the formation of a nearly perfect multi-walled carbon nanotube.

Morphologies and Related Electronic Properties of Carbon Nanotubes

1998 ◽  
Vol 13 (9) ◽  
pp. 2368-2379 ◽  
Author(s):  
J-C. Charlier
Keyword(s):  
Carbon Nanotubes ◽  
Solid State ◽  
Structural Optimization ◽  
Ab Initio ◽  
Electronic Properties ◽  
Graphene Sheet ◽  
Electronic Structures ◽  
Tight Binding ◽  
Electronic States

The electronic structures of different morphologies of carbon nanotubes are investigated within either tight-binding or ab initio frameworks. After a brief description of the electronic properties of the “perfect” rolled-up graphene sheet, nanotubes containing pentagon-heptagon pairs, tips (hemispherical caps), sp3-like lines responsible for polygonization, multishell and solid-state packings (bundles) are studied in order to point out the influence of such defects on the electronic states of the “perfect” cylinders. Most of the time, a structural optimization was performed on the atomic topology, prior to the calculation of the electronic properties. Connections with experimental facts are indicated as frequently as possible.

Zigzag Carbon Nanotubes under Simple Torsion – Structural Mechanics Formulation

2012 ◽  
Vol 452-453 ◽  
pp. 1139-1143
Author(s):  
Najib A. Kasti
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Mechanics ◽  
Graphene Sheet ◽  
Structural Mechanics ◽  
Bending Stiffness ◽  
Axial Stiffness ◽  
Simple Tension ◽  
Bond Bending

When using structural mechanics to study the deformation of carbon nanotubes (CNTs), one has to pick the structural mechanics properties that are equivalent to the molecular mechanics properties. In a previous publication [1], we have determined the relation between the bending stiffness EI/a used in structural mechanics and the bond bending stiffness C used in molecular mechanics for zigzag carbon nanotubes under simple tension. This paper extends the concept and determines the corresponding relation for simple torsion. We show that the relation obtained is different than that of simple tension; in simple torsion, EI/a is load and chirality dependent. However, for the particular case of a graphene sheet, simple tension and torsion lead to the same value of EI/a, namely C/2. We also include the structural mechanics deformation of the tube that accounts for axial, bending and torsional structural stiffnesses. Unlike simple tension, the deformation in the case of simple torsion has the axial stiffness coupled to the bending and torsional stiffnesses.

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.

Phonon dispersions in graphene sheet and single-walled carbon nanotubes

Pramana ◽  
2013 ◽  
Vol 81 (6) ◽  
pp. 1021-1035 ◽  
Author(s):  
DINESH KUMAR ◽  
VEENA VERMA ◽  
H S BHATTI ◽  
KEYA DHARAMVIR
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Sheet ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
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