scholarly journals Electromagnetic Wave Interactions with 2D Arrays of Single-Wall Carbon Nanotubes

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Taha A. Elwi ◽  
Hussain M. Al-Rizzo
Keyword(s):  
Carbon Nanotubes ◽  
Cross Sections ◽  
Single Wall Carbon Nanotubes ◽  
Wave Interactions ◽  
Impedance Boundary ◽  
Frequency Regime ◽  
2D Arrays ◽  
Visible Frequency ◽  
Electromagnetic Wave Interactions ◽  
Walled Carbon Nanotubes

We report, for the first time, the scattering, absorption, and reflection characteristics of 2D arrays of finite-length, armchair, single-walled carbon nanotubes (SWNTs) in the visible frequency regime. The analysis is based on the Finite-Element-Method formulation of Maxwell's equations and a 3D quantum electrical conductivity function. Three geometrical models have been considered: solid cylinder, hollow cylinder, and honeycomb. We demonstrate that classical electromagnetic theory is sufficient to evaluate the scattering and absorption cross sections of SWNTs, which revealed excellent agreement against measurements without the need to invoke the effective impedance boundary conditions. The solid and hollow cylindrical models fail to provide accurate results, whenbothscattering and absorption are considered. Finally, it is shown that reflection and transmission characteristics of both individual and arrays of SWNTs, which are essential for solar cell applications, are strongly influenced by the length and the phenomenological parameters of the SWNT.

Effects of prenatal exposure to single-wall carbon nanotubes on reproductive performance and neurodevelopment in mice

2014 ◽  
Vol 32 (7) ◽  
pp. 1293-1301 ◽  
Author(s):  
Saeed Ivani ◽  
Isaac Karimi ◽  
Seyed Reza Fatemi Tabatabaei ◽  
Leila Syedmoradi
Keyword(s):  
Carbon Nanotubes ◽  
Prenatal Exposure ◽  
Motor Development ◽  
Behavioral Changes ◽  
Single Wall Carbon Nanotubes ◽  
Control Group ◽  
Plus Maze ◽  
Righting Reflex ◽  
Novel Drug ◽  
Walled Carbon Nanotubes

Carbon nanotubes with extraordinary properties may become a novel drug and gene delivery tool in nanomedicine; however, insufficient information is available regarding their biosafety. Therefore, this work was performed to study the effect of prenatal exposure of single-walled carbon nanotubes (SWCNTs) on reproductive and neurobehavioral endpoints in mice. Thirty pregnant female mice were assigned to three groups ( n = 10 for each group). The two treated groups were injected intraperitoneally (i.p.) with 1 or 10 mg/kg body weight (b.w.) of SWCNTs suspended in 1 ml of phosphate buffer saline (PBS) on gestational days 0 and 3. The control group was injected i.p. with an equal volume of PBS. The neurobehavioral ontogeny of pups was evaluated using a modified Fox battery. A decrease in litter size on postnatal day 2 was observed in the group treated with 10 mg/kg b.w. of SWCNTs whereas no significant differences between groups were observed in any other parameters. The behavioral development of pups did not show significant differences during growth except for the surface righting reflex, which showed significant delay compared to control in the group treated with 1 mg/kg b.w. SWCNTs. Moreover, exposed offspring (10 mg/kg b.w. SWCNTs) displayed enhanced anxiety in the elevated plus maze; however, other ethological analysis (Morris water maze and open field test) did not show behavioral changes in the experimental groups. In conclusion, the present results demonstrated small changes in offspring sensory and motor development following exposure to SWCNTs and support the idea that SWCNT risk assessment merits further investigation.

A DFT-D study on the interaction between lactic acid and single-wall carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (118) ◽  
pp. 97724-97733 ◽  
Author(s):  
Alireza Najafi Chermahini ◽  
Abbas Teimouri ◽  
Hossein Farrokhpour
Keyword(s):  
Carbon Nanotubes ◽  
Density Functional Theory ◽  
Lactic Acid ◽  
Density Functional ◽  
Single Walled Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Acid Molecule ◽  
Functional Theory ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Density functional theory (DFT) was used to investigate the adsorption of lactic acid molecule on the surface of (4,4), (5,5), (6,6) and (7,7) single-walled carbon nanotubes (SWCNTs).

Molecular Dynamics Simulation of Bi-Carboxyl Sidewall Functionalized Single-Wall Carbon Nanotubes in Water

2015 ◽  
Vol 1131 ◽  
pp. 106-109
Author(s):  
Shongpun Lokavee ◽  
Chatchawal Wongchoosuk ◽  
Teerakiat Kerdcharoen
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Md Simulations ◽  
Dynamics Simulation ◽  
Single Wall Carbon Nanotubes ◽  
First Principles Calculations ◽  
Carboxylic Groups ◽  
Potential Applications ◽  
Walled Carbon Nanotubes ◽  
Defective Sites

Functionalized single-walled carbon nanotubes (f-SWNTs) have attracted great interest due to their enhancement of SWNT properties leading to an increase in potential applications beyond those of pristine SWNT. In this work, we have investigated the behavior of open-end (9,0) bi-carboxyl sidewall functionalized SWNTs in water using molecular dynamics (MD) technique within GROMACS software package based on the OPLS force fields with modified charges obtained from the first principles calculations. The model tubes including perfect and defective nanotubes covalently functionalized by bi-carboxylic groups on different sidewall surface orientation were fully optimized by B3LYP/6-31G(d,p). The simulations were performed at the constant volume and temperature in a rectangular box with periodic boundary conditions in which each system contains one model tube and ~1680 water molecules. The results form MD simulations showed that functionalization on the central carbon atom in the (C1,C ́1)SW-defective sites strongly affects on the dynamic behavior of CNT in water. Results showed that the hydrophilic behavior of the functionalized SWNT has been improved over the pristine and defective nanotubes.

Cutting Single Wall Carbon Nanotubes

1999 ◽  
Vol 593 ◽  
Author(s):  
I. Stepanek ◽  
G. Maurin ◽  
P Bernier ◽  
J. Gavillet ◽  
A. Loiseau
Keyword(s):  
Carbon Nanotubes ◽  
Nitrogen Adsorption ◽  
Diamond Powder ◽  
Single Wall Carbon Nanotubes ◽  
X Ray Diffraction ◽  
Transmission Electron Microscopy Micrographs ◽  
Transmission Electron ◽  
Breaking Mechanism ◽  
Oxidation In Air ◽  
Walled Carbon Nanotubes

ABSTRACTIn this contribution, we report on a mechanical method to cut and open single walled carbon nanotubes. This technique is based on using an abrasive material (diamond powder) without any chemical treatments or oxidation in air at high temperature. We present highresolution transmission electron microscopy micrographs, which show firstly that the tubes are unambiguously opened and secondly, that the nanotubes have not suffered the treatment. x-ray diffraction pattern confirms a well-defined bundle organisation. A breaking mechanism of the nanotube bundles is proposed. Nitrogen adsorption measurements at 77K reveal the presence of new microporosities ranging in the average nanotube diameter, which confirm the opening of some tubes.

Direct evidence for the existence of multi-walled carbon nanotubes with hexagonal cross-sections

Carbon ◽  
2012 ◽  
Vol 50 (7) ◽  
pp. 2524-2529 ◽  
Author(s):  
Zhanbing He ◽  
Xiaoxing Ke ◽  
Sara Bals ◽  
Gustaaf Van Tendeloo
Keyword(s):  
Carbon Nanotubes ◽  
Cross Sections ◽  
Direct Evidence ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Application and Research of Nursing Products Based on Single Wall Carbon Nanotubes in Personal Health Care

2021 ◽  
Vol 21 (2) ◽  
pp. 1042-1047
Author(s):  
Xiaowei Li ◽  
Wenbo Zhao ◽  
Dong Zhao ◽  
Hongyan Jing
Keyword(s):  
Carbon Nanotubes ◽  
Extraction Method ◽  
Personal Care Products ◽  
Single Walled Carbon Nanotubes ◽  
Raw Material ◽  
Single Wall Carbon Nanotubes ◽  
Personal Care ◽  
Separation And Purification ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Single walled carbon nanotubes have special chemical and physical properties, at the same time, they have the advantage of macro maneuverability in maneuverability, so they have the potential of multi-functional applications. At present, composite materials, super capacitors and corresponding personal care products based on carbon nanotubes are widely used in all aspects of people’s lives, and these products have obvious functional advantages. In this paper, based on the application of single-walled carbon nanotubes technology in personal care products, the separation and purification of ginsenoside pods, the raw material of high-end washing and care products, was studied. In order to enhance the conductivity and tensile strength of SWNTs, this paper innovatively introduces the purification method of current acid treatment to enhance the performance of SWNTs. Based on the improved single-walled carbon nanotubes technology, the extraction efficiency of the optimized single-walled carbon nanotubes was analyzed. In the end of this paper, the optimized extraction method of ginsenoside pods from SWNTs is compared with the traditional extraction method. The experimental results show that SWNTs has obvious time efficiency advantage.

Directly Measured Optical Absorption Cross Sections for Structure-Selected Single-Walled Carbon Nanotubes

Nano Letters ◽  
2014 ◽  
Vol 14 (3) ◽  
pp. 1530-1536 ◽  
Author(s):  
Jason K. Streit ◽  
Sergei M. Bachilo ◽  
Saunab Ghosh ◽  
Ching-Wei Lin ◽  
R. Bruce Weisman
Keyword(s):  
Carbon Nanotubes ◽  
Optical Absorption ◽  
Cross Sections ◽  
Single Walled Carbon Nanotubes ◽  
Absorption Cross ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Synthesis and gas-sensing properties of phenylhydrazine-functionalized single wall carbon nanotubes in polymer matrix

2013 ◽  
Vol 11 (6) ◽  
pp. 945-952
Author(s):  
Kertriin Paabo ◽  
Tea Avarmaa ◽  
Raivo Jaaniso ◽  
Margus Kodu ◽  
Uno Mäeorg ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensing ◽  
Sodium Dodecyl ◽  
Single Wall Carbon Nanotubes ◽  
Sensor Material ◽  
Gas Sensing Properties ◽  
Different Temperatures ◽  
Higher Temperature ◽  
Permeable Polymer ◽  
Walled Carbon Nanotubes

AbstractGas sensor material was prepared by encapsulation of functionalized single-walled carbon nanotubes (SWCNT) into a gas-permeable polymer poly(1-trimethylsilyl-1-propyne) (PTMSP). A phenylhydrazino group was used for the functionalization of SWCNTs to improve their solubility and compatibility with polymers. Syntheses were carried out in aqueous surfactant solutions and in pure phenylhydrazine without surfactant. Two different temperatures (24 and 50°C) and two surfactants (sodium dodecyl sulfate and tricaprylmethylammonium chloride — Aliquat®336) were compared. Functionalized SWCNTs were characterized by X-ray photoelectron (XPS), Raman and Fourier transform infrared (FTIR) spectroscopy. Analyses showed that the synthesis at higher temperature in pure phenylhydrazine resulted in the highest functionalization yield. Phenylhydrazine itself proved to be a good solvent for SWCNTs. The functionalized nanotubes were soluble in organic solvents that under the same conditions were appropriate solvents for polymers. The sensitivity of functionalized SWCNT-PTMSP thin film composite to NO2 gas at room temperature was significantly higher than that of the similar sensor material containing the pristine SWCNTs.

scholarly journals MUTAGENIC ACTIVITY OF NANOMATERIALS IN THE AMES TEST. LITERATURE REVIEW

2019 ◽  
Vol 98 (11) ◽  
pp. 1309-1320
Author(s):  
Lyudmila V. Akhaltseva ◽  
V. S. Zhurkov ◽  
F. I. Ingel
Keyword(s):  
Carbon Nanotubes ◽  
Ames Test ◽  
Mutagenic Activity ◽  
Gene Mutations ◽  
Mutagenic Effect ◽  
Single Wall Carbon Nanotubes ◽  
Sharp Change ◽  
Negative Results ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Despite the widespread use of nanomaterials in various areas of industry and medicine, the question of assessing their safety, in particular, genotoxicity, remains to be open. The review presents the analysis of the results of a number of nanomaterials mutagenic activity evaluations in the test for induction of reverse mutations in bacteria (the Ames test). The literature search was carried out using PubMed, eLIBRARY.RU, Web of Science, Google Scholar databases up to 2019. The analysis of the literature showed mostly negative results on the induction of gene mutations. Particularly, quantum dots (QD), nanoparticles, and nanofibres of aluminum oxide and hydroxide, multi-walled carbon nanotubes (MWCNTs) and single-wall carbon nanotubes (SWCNTs) did not induce gene mutations. Among the more than 120 different types of nanomaterials (size, coating), for 22 the mutagenic activity as varying severity was found. These few numbers of positive results show that the degree of the mutagenic effect of nanomaterials may depend on the conditions of the experiment as well as coating composition. So, the diversity of nanomaterials and the sharp change in their properties even with a slight shift in the particle size parameters leads to the necessity to study the mutagenic activity of each nanomaterial separately. We conclude that there is the necessity to elaborate special international documents with the reglament of the investigation of nanomaterials’ mutagenic properties in the Ames test using the range of concentrations, with the full set of indicator strains and the description of the exact dimensions and properties of the studied particles.

New phenomena in the nanospace of single-wall carbon nanotubes

2017 ◽  
Author(s):  
Z.J. Shi ◽  
Z.N. Gu
Keyword(s):  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Chemical Substances ◽  
Fullerene Derivatives ◽  
Single Wall Carbon ◽  
Endohedral Metallofullerenes ◽  
New Phenomena ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

This article describes the new phenomena of chemical substances encapsulated in the hollow spaces of carbon nanotubes, with particular emphasis on the nanospace of single-wall carbon nanotubes (SWNTs) that have nanospaces of about 1 nm in diameter. It begins with a brief introduction to the filling methods and the filling of multiwalled carbon nanotubes, followed by a discussion of the structures, phase transitions and chemical reactions of some typical fullerenes, endohedral metallofullerenes, fullerene derivatives, and inorganic and organic compounds, in the nanospace of SWNTs. The electron transfer between dopants and SWNTs is also examined. The article also considers the filling of double-walled carbon nanotubes.

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