Study of Focusing Effects during the Channeling of Hydrogen Atoms in Non-Chiral Single-Layer Carbon Nanotubes

2021 ◽  
Vol 15 (6) ◽  
pp. 1249-1254
Author(s):  
N. V. Maksyuta ◽  
V. I. Vysotskii ◽  
S. V. Efimenko ◽  
Ye. V Martysh ◽  
D. N. Maksyuta ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Layer ◽  
Hydrogen Atoms

The Mechanism of Getting New Composite Polymer Materials with Improved Hardness Properties

2021 ◽  
Vol 887 ◽  
pp. 85-90
Author(s):  
L.S. Elbakyan ◽  
I.V. Zaporotskova ◽  
D.E. Vilkeeva
Keyword(s):  
Carbon Nanotubes ◽  
Polymer Material ◽  
Single Layer ◽  
Scientific Basis ◽  
Strength Properties ◽  
Polymer Materials ◽  
Mechanical Mixing ◽  
Material Component ◽  
Adsorption Interaction ◽  
The Matrix

The main aims and the objectives of the study focused on solving current problems of nanomaterial science of new materials – creating the scientific basis for competitive methods of obtaining and controlling new composite materials having improved strength properties based on carbon-containing polymer matrices with nanotubes stabilized in them. A technology for obtaining experimental samples of nanocompositional polymer material based on polymethylmethacrylate, polybutylmethacrylate, and methacrylic acid doped with carbon nanotubes has been developed, using ultrasonic action and mechanical mixing of the composite mixture to achieve the most uniform distribution of nanotubes in the matrix. To determine the possibility of implementing the mechanism of adsorption interaction of the studied polymer material with the surface of carbon nanotubes, DFT calculations of the interaction of the polymer material component and single-layer carbon nanotubes of various types have been done.

First-Principles Study of Interaction of Lithium Atoms with (3, 3) Carbon Nanotubes

2014 ◽  
Vol 687-691 ◽  
pp. 4311-4314 ◽  
Author(s):  
Shun Fu Xu ◽  
Ling Min Li
Keyword(s):  
Carbon Nanotubes ◽  
First Principles ◽  
Density Functional ◽  
Vacancy Defect ◽  
Single Wall Carbon Nanotubes ◽  
Generalized Gradient ◽  
Hydrogen Atoms ◽  
Functional Theory ◽  
Vacancy Defects ◽  
Adsorption Mechanisms

In this paper, we have employed first-principles calculations to investigate the adsorption mechanisms of one lithium atom on the sidewalls of 1/2/3 H-adsorbed indefective/defective (3, 3) single-wall carbon nanotubes (CNTs) which have vacancy defects. Our calculations are performed within density functional theory (DFT) under the generalized gradient approximation (GGA) of Perdew, Burke, and Ernzerhof (PBE).Our results show that the lithium atoms strongly binds to the H-adsorbed (3, 3) nanotube. Lithium atoms can chemically adsorb on (3, 3) nanotube with the vacancy defect (MVD) without any energy barrier. The lithium adsorption will enhance the electrical conductivity of the nanotube. Further more, the structure of the (3, 3) nanotube with the MVD and hydrogen atoms will become more stable after the three kinds of lithium adsorption.

scholarly journals DISPERSION INTERACTION OF ATOMS WITH SINGLE-WALLED CARBON NANOTUBES DESCRIBED BY THE DIRAC MODEL

2011 ◽  
Vol 03 ◽  
pp. 555-563 ◽  
Author(s):  
YU. V. CHURKIN ◽  
A. B. FEDORTSOV ◽  
G. L. KLIMCHITSKAYA ◽  
V. A. YUROVA
Keyword(s):  
Carbon Nanotubes ◽  
Hydrogen Atom ◽  
Interaction Energy ◽  
Hydrogen Molecule ◽  
Single Walled Carbon Nanotubes ◽  
Hydrogen Atoms ◽  
Single Walled Carbon ◽  
Atoms And Molecules ◽  
Proximity Force Approximation ◽  
Walled Carbon Nanotubes

We calculate the interaction energy and force between atoms and molecules and single-walled carbon nanotubes described by the Dirac model of graphene. For this purpose the Lifshitz-type formulas adapted for the case of cylindrical geometry with the help of the proximity force approximation are used. The results obtained are compared with those derived from the hydrodymanic model of graphene. Numerical computations are performed for hydrogen atoms and molecules. It is shown that the Dirac model leads to larger values of the van der Waals force than the hydrodynamic model. For a hydrogen molecule the interaction energy and force computed using both models are larger than for a hydrogen atom.

Catalytic Synthesis of Single-Layer Carbon Nanotubes with a Wide Range of Diameters

1994 ◽  
Vol 98 (26) ◽  
pp. 6612-6618 ◽  
Author(s):  
Ching-Hwa Kiang ◽  
William A. III Goddard ◽  
Robert Beyers ◽  
Jesse R. Salem ◽  
Donald S. Bethune
Keyword(s):  
Carbon Nanotubes ◽  
Single Layer ◽  
Catalytic Synthesis ◽  
Wide Range

DYNAMICAL BEHAVIORS OF FLUID-FILLED MULTI-WALLED CARBON NANOTUBES

2010 ◽  
Vol 24 (24) ◽  
pp. 4727-4739 ◽  
Author(s):  
Y. YAN ◽  
W. Q. WANG ◽  
L. X. ZHANG
Keyword(s):  
Carbon Nanotubes ◽  
Resonant Frequency ◽  
Amplitude Ratio ◽  
Critical Role ◽  
Single Layer ◽  
Coupling Vibration ◽  
Dynamical Behaviors ◽  
Internal Fluid ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This paper is concerned with the free vibration of the fluid-filled multi-walled carbon nanotubes (MWCNTs) with simply supported ends. Based on Donnell's cylindrical shell model and potential flow theory, the effects of internal fluid and the different radii on the coupling vibration of the MWCNT-fluid system are discussed in detail. The results show that the fluid has only a little influence on the natural resonant frequency (frequency of the innermost tube) and the associated amplitude ratio in MWCNTs, while it plays a significant role in the intertube resonant frequency and the associated amplitude ratio. For the natural resonant frequency, the vibrational mode is almost coaxial, i.e., the MWCNTs vibrate like a single-layer shell, however, for the intertube resonant frequency, the system shows complex noncoaxial vibration, which plays a critical role in electronic and transport properties of carbon nanotubes (CNTs). Simultaneously, the effect of the innermost radius on the frequencies of MWCNTs is also examined and the conclusions accord well with those of another paper.

ChemInform Abstract: Production and Properties of Fullerene Relatives: Metallofullerenes and Single-Layer Carbon Nanotubes

ChemInform ◽  
2010 ◽  
Vol 26 (41) ◽  
pp. no-no
Author(s):  
D. S. BETHUNE ◽  
C.-H. KIANG ◽  
R. BEYERS ◽  
P. H. M. VAN LOOSDRECHT ◽  
M. S. DE VRIES ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Layer

Chemisorption of Hydrogen Atoms on the Sidewalls of Armchair Single-Walled Carbon Nanotubes

2007 ◽  
Vol 111 (20) ◽  
pp. 7376-7383 ◽  
Author(s):  
T. C. Dinadayalane ◽  
Anna Kaczmarek ◽  
Jerzy Łukaszewicz ◽  
Jerzy Leszczynski
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Hydrogen Atoms ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Multi-Walled Carbon Nanotubes Composites for Microwave Absorbing Applications

2019 ◽  
Vol 9 (5) ◽  
pp. 851 ◽  
Author(s):  
Patrizia Savi ◽  
Mauro Giorcelli ◽  
Simone Quaranta
Keyword(s):  
Carbon Nanotubes ◽  
Reflection Coefficient ◽  
Epoxy Resin ◽  
Microwave Absorption ◽  
Complex Permittivity ◽  
Layer Structure ◽  
Single Layer ◽  
Resin Matrix ◽  
Complex Permeability ◽  
Multiwalled Carbon

The response of materials to impinging electromagnetic waves is mainly determined by their dielectric (complex permittivity) and magnetic (complex permeability). In particular, radar absorbing materials are characterized by high complex permittivity (and eventually large values of magnetic permeability), Indeed, energy dissipation by dielectric relaxation and carrier conduction are principally responsible for diminishing microwave radiation reflection and transmission in non-magnetic materials. Therefore, the scientific and technological community has been investigating lightweight composites with high dielectric permittivity in order to improve the microwave absorption (i.e., radar cross-section reduction) in structural materials for the aerospace industry. Multiwalled carbon nanotubes films and their composites with different kind of polymeric resins are regarded as promising materials for radar absorbing applications because of their high permittivity. Nanocomposites based on commercial multi-wall carbon nano-tube (MWCNT) fillers dispersed in an epoxy resin matrix were fabricated. The morphology of the filler was analyzed by Field emission scanning electron microscopy (FESEM) and Raman spectroscopy, while the complex permittivity and the radiation reflection coefficient of the composites was measured in the radio frequency range. The reflection coefficient of a single-layer structure backed by a metallic plate was simulated based on the measured permittivity. Simulation achievements were compared to the measured reflection coefficient. Besides, the influence of morphological MWCNT parameters (i.e., aspect ratio and specific surface area) on the reflection coefficient was evaluated. Results verify that relatively low weight percent of MWCNTs are suitable for microwave absorption applications when incorporated into polymer matrixes (i.e., epoxy resin).

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