The Internal Buckling Behavior Induced by Growth Self-restriction in Vertical Multi-walled Carbon Nanotube Arrays

MRS Advances ◽  
2018 ◽  
Vol 3 (45-46) ◽  
pp. 2815-2823 ◽  
Author(s):  
Quan Zhang ◽  
Guo-an Cheng ◽  
Rui-ting Zheng
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Van Der Waals ◽  
Nanotube Arrays ◽  
Nanotube Array ◽  
Static Compression ◽  
Carbon Nanotube Array ◽  
Carbon Nanotube Arrays ◽  
Compression Model ◽  
Quasi Static Compression

ABSTRACTThe internal buckling is a common phenomenon in the as-grown carbon nanotube arrays. It makes the physical properties of carbon nanotube array in experiment lower than that in theory. In this work, we analyzed the formation and evolution mechanism of the internal buckling based on quasi-static compression model, which is different from collective effect of the van der Waals interactions. The self-restriction effect and the different growth rate of carbon nanotubes verify the possibility of the quasi-static compression model to explain the morphology evolution of vertical carbon nanotube arrays, especially the phenomenon of the quasi-straight and bent carbon nanotubes coexisted in the array. We generalized the Euler beam to wave-like beam and explained the mechanism of high-mode buckling combined with the van der Waals interaction. The calculated result about the link between compressive stress and strain confirms with the stage of collective buckling in the quasi-static compression test of carbon nanotube array. Preparation of well-organized carbon nanotube arrays was strong evidence verified the effect of self-restriction in experiment.

Fast mass transport-assisted convective heat transfer through a multi-walled carbon nanotube array

Nanoscale ◽  
2018 ◽  
Vol 10 (48) ◽  
pp. 23103-23112 ◽  
Author(s):  
Wonjae Jeon ◽  
Taehun Kim ◽  
Sung-Min Kim ◽  
Seunghyun Baik
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotube ◽  
Mass Transport ◽  
Convection Heat Transfer ◽  
Nanotube Arrays ◽  
Convection Heat ◽  
Nanotube Array ◽  
Carbon Nanotube Array ◽  
Carbon Nanotube Arrays ◽  
Multi Walled Carbon Nanotube

Fast mass transport-assisted forced convection heat transfer of air is realized through the interstitial space of multi-walled carbon nanotube arrays.

Enhanced water flux in vertically aligned carbon nanotube arrays and polyethersulfone composite membranes

2014 ◽  
Vol 2 (31) ◽  
pp. 12171-12176 ◽  
Author(s):  
Shaoyun Li ◽  
Gaomin Liao ◽  
Zhipeng Liu ◽  
Yuanyuan Pan ◽  
Qiang Wu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Water Flux ◽  
Composite Membranes ◽  
Nanotube Arrays ◽  
Nanotube Array ◽  
Filtration Membranes ◽  
Carbon Nanotube Array ◽  
Carbon Nanotube Arrays ◽  
Ultra Filtration ◽  
Vertically Aligned

A vertically aligned carbon nanotube array structure enhances water flux in polyethersulfone ultra-filtration membranes.

scholarly journals Aligned carbon nanotube array stiffness from stochastic three-dimensional morphology

Nanoscale ◽  
2015 ◽  
Vol 7 (46) ◽  
pp. 19426-19431 ◽  
Author(s):  
Itai Y. Stein ◽  
Diana J. Lewis ◽  
Brian L. Wardle
Keyword(s):  
Carbon Nanotube ◽  
Three Dimensional ◽  
Nanotube Arrays ◽  
Nanotube Array ◽  
Carbon Nanotube Array ◽  
Carbon Nanotube Arrays

Stiffness of aligned carbon nanotube arrays from their stochastic three-dimensional packing morphology.

scholarly journals The shape of the orientation distribution of carbon nanotubes in aligned arrays

2014 ◽  
Vol 70 (a1) ◽  
pp. C596-C596
Author(s):  
Ulla Vainio ◽  
Thea Schnoor ◽  
Sarathlal Koyiloth Vayalil ◽  
Karl Schulte ◽  
Martin Müller ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Iron Catalyst ◽  
Chemical Vapour ◽  
Orientation Distribution ◽  
Steric Interaction ◽  
Nanotube Arrays ◽  
X Ray ◽  
Carbon Nanotube Arrays ◽  
Vertically Aligned

Recent simulations of vertically aligned carbon nanotube arrays have shown that the shape of the orientation distribution of nanotubes within the array has a drastic effect on the electrical properties of the array. Orienting of shape-anisotropic objects can be carried out in several different ways such as shearing, magnetically steering, or by vibrating the objects. Nevertheless, perfect orientation is difficult if not impossible to achieve. In the case of the growth of carbon nanotube arrays, self-confinement can occur affecting the resultant orientation distribution. Yet so far the shape of the orientation distribution has not been quantified in great detail and it has been mostly assumed to be Gaussian or Lorentzian. In the present work, multi-walled carbon nanotube arrays were grown via aerosol-assisted chemical vapour deposition with iron catalyst and investigated using small-angle X-ray scattering, a method perfectly suited to characterizing the orientation of carbon nanotubes. Using a microfocused X-ray beam of 24 μm x 17 μm in size at beamline P03 of the PETRA III synchrotron storage ring in Hamburg, we determined the orientation distribution of the vertically aligned carbon nanotubes along the film height. Remarkably, the packing density of the carbon nanotubes seems to correlate not only with the width of the distribution but also its shape. The shape of the orientation distribution was then compared to that from different oriented systems. These findings indicate that by using alignment methods that are based on steric interaction between particles, such as shearing or self-confinement during particle growth, the system will reach an alignment with an orientation distribution closer to the Laplace distribution than to the normal distribution. Such a finding has profound implications for simulation studies of mechanical, electrical and other properties of many hierarchical materials.

scholarly journals Resonance Raman and IR spectroscopy of aligned carbon nanotube arrays with extremely narrow diameters prepared with molecular catalysts on steel substrates

2017 ◽  
Vol 19 (45) ◽  
pp. 30667-30674 ◽  
Author(s):  
Sagar Motilal Jain ◽  
Federico Cesano ◽  
Domenica Scarano ◽  
Tomas Edvinsson
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Ir Spectroscopy ◽  
Resonance Raman ◽  
Nanotube Arrays ◽  
Molecular Catalyst ◽  
Carbon Nanotube Arrays ◽  
Molecular Catalysts ◽  
Steel Substrates ◽  
Raman And Ir Spectroscopy

Resonance and IR spectroscopy of carbon nanotubes with extremely narrow diameters grown directly on steel grids using a molecular catalyst.

scholarly journals Carbon nanotube array as a van der Waals two-dimensional hyperbolic material

2019 ◽  
Vol 100 (23) ◽  
Author(s):  
R. G. Polozkov ◽  
N. Y. Senkevich ◽  
S. Morina ◽  
P. Kuzhir ◽  
M. E. Portnoi ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Nanotube Array ◽  
Carbon Nanotube Array

Analysis of Visible Radiative Properties of Vertically Aligned Multi-Walled Carbon Nanotubes

2010 ◽  
Author(s):  
Hua Bao ◽  
Xiulin Ruan ◽  
Timothy S. Fisher
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Volume Fraction ◽  
Incidence Angle ◽  
Radiative Properties ◽  
Tube Length ◽  
Nanotube Arrays ◽  
Carbon Nanotube Arrays ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Finite-difference time-domain method is used to investigate the optical properties of vertical arrays of multi-walled carbon nanotubes. Individual carbon nanotubes are treated as solid circular cylinders with an effective dielectric tensor. Our results confirm that carbon nanotube arrays have extremely low reflectivity as observed in experiments. Compared with the commonly used Maxwell-Garnett theory, our calculations generally give larger reflectance and absorptance and smaller transmittance, which are attributed to the diffraction and scattering within the cylinder array structure. The effects of volume fraction, tube length, and incidence angle on radiative properties are investigated respectively. Low volume fraction and long tubes are more favorable to achieve low reflectance and high absorptance. The angular dependence study shows that there exists an optimum incidence angle at which the reflectance can be minimized, indicating that a small misalignment in carbon nanotube arrays can slightly enhance the absorptance. Our results also indicate that an even darker material could be achieved by using carbon nanotubes with good alignment on the top surface.

Selective sorting of metallic/semiconducting single-walled carbon nanotube arrays by ‘igniter-assisted gas-phase etching’

2018 ◽  
Vol 2 (1) ◽  
pp. 157-162 ◽  
Author(s):  
Qiuchen Zhao ◽  
Zequn Wang ◽  
Lianming Tong ◽  
Zhe Zheng ◽  
Wenping Hu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Small Molecules ◽  
Gas Phase ◽  
Single Walled Carbon Nanotubes ◽  
Nanotube Arrays ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Carbon Nanotube Arrays ◽  
Walled Carbon Nanotubes

Small molecules are used as “igniters” for the selective sorting of metallic/semiconducting single-walled carbon nanotubes by a gas phasing etching process.

scholarly journals Electrochemical sensors based on carbon nanotubes and their use in biomedical research

2012 ◽  
Vol 58 (1) ◽  
pp. 12-31
Author(s):  
V.A. Buzanovskii
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electrode Surface ◽  
Electrochemical Sensors ◽  
General Information ◽  
Nanotube Array ◽  
The Third ◽  
Carbon Nanotube Array ◽  
Working Surface ◽  
Manufacturing Techniques

Electrochemical sensors based on carbon nanotubes are widely used in biomedical studies. According to design the sensors can be divided into three groups: (i) sensors based on a carbon nanotube array; (ii) sensors manufactured by means of composites containing carbon nanotubes; (iii) sensors, which are electrodes with working surface containing carbon nanotubes. The development directions of sensors of the first and the second group, and also sensors of the third group which are manufactured by abrasive immobilization of carbon nanotubes on an electrode surface and by solvent dispersion and casting immobilization of carbon nanotubes on an electrode surface by means of N,N-dimethylformamide, surfactants, and Nafion are analyzed. The general information on manufacturing techniques of these sensors is given. The opportunities of these sensors for biomedical researches are demonstrated.

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