نتایج جستجو برای: wall carbon nanotubes

تعداد نتایج: 450288  

B. Gholamalian M. Hamadanian, M. Oftadeh,

The effective parameters of (5, 0) and (5, 5) single-wall carbon nanotubes during the interaction with carbon dioxide as sensors are determined. The interaction of carbon dioxide  molecules with internal and external walls of the nanotubes is studied using Gaussian 03 coding by density functional theory (DFT) at the B3LYP/6-311G level of theory. CO2 rotation around tube axles vertically and par...

Journal: :analytical and bioanalytical chemistry research 2014
meissam noroozifar mozhgan khorasani motlagh reza akbari mojtaba bemanadi parizi

in this study, incorporation of iron ion-doped natrolite nanozeolite, multi-wall carbon nanotubes into chitosan-coated glassy carbon electrode for the simultaneous determination of ascorbic acid, epinephrine, uric acid and tyrosine is studied. the results show that the combination of multi-wall carbon nanotubes and iron ion-doped natrolite zeolite causes a dramatic enhancement in the sensitivit...

2008
A. Goyal D. A. Wiegand F. J. Owens Z. Iqbal

Uniform dispersion of pre-synthesized nanotubes in metal matrices is difficult to achieve, and there is substantial damage to the nanotubes during subsequent composite fabrication. The demonstration of an in-situ process involving chemical vapor deposition of single-wall and multi-wall carbon nanotubes into iron matrices without the concomitant formation of iron carbides is reported here. It wa...

Journal: :Journal of electron microscopy 2005
Renu Sharma Peter Rez Michael M J Treacy Steven J Stuart

We report in situ environmental transmission electron microscope observations of the nucleation and growth of multi-wall and single-wall carbon nanotubes formed by the catalytic decomposition of acetylene (C2H2) on Ni/SiO2 catalyst. The growth rate, structure and morphology of the carbon nanotubes formed depended upon reaction temperature and pressure. Under 20-100 mTorr of gas pressures at 480...

Journal: :nanomedicine research journal 0
ehsan zayerzadeh department of biology, faculty of food industry and agriculture, standard research institute, karaj, iran azadeh fardipour department of quality control, razi vaccine and serum research institute, karaj, iran meisam shabanian faculty of chemistry and petrochemical engineering, standard research institute, karaj,iran mohammad kazem koohi department of basic sciences, faculty of veterinary medicine, university of tehran, tehran, iran

objective(s): carbon nanotubes have unique mechanical, electrical, and thermal properties, with potential different applications in nanomedicine, electronics, and other industries. these new applications of carbon nanotubes in different industries lead to the increased exposure risk of nanomaterials to human. up to now, all aspects of carbon nanotubes toxicity are not completely clear following...

2005
H Cai

Based on Timoshenko laminated beam models, this paper investigates the influence of initial stress on the vibration and transverse wave propagation in individual multi-wall carbon nanotubes (MWNTs) under ultrahigh frequency (above 1 THz), in which the initial stress in the MWNTs can occur due to thermal or lattice mismatch between different materials. Considering van der Waals force interaction...

2000
L. P. Biró G. I. Márk J. Gyulai P. A. Thiry

Carbon nanotubes are a new allotrope of carbon which emerged from the fullerene family [1]. Carbon nanotubes have been discovered by high resolution transmission electron microscopy (HRTEM) in 1991 by Iijima [2]. A single wall carbon nanotube is constituted of one atomic plane with a graphite-like arrangement of C atoms – called a graphene sheet – which is perfectly rolled into a cylinder (Fig....

2001
Mildred S. Dresselhaus Phaedon Avouris

A brief historical review of carbon nanotube research is presented and some basic definitions relevant to the structure and properties of carbon nanotubes are provided. Carbon nanotubes are unique nanostructures that can be considered conceptually as a prototype one-dimensional (1D) quantum wire. The fundamental building block of carbon nanotubes is the very long all-carbon cylindrical Single W...

Journal: :Physical review letters 2008
C Kramberger R Hambach C Giorgetti M H Rümmeli M Knupfer J Fink B Büchner Lucia Reining E Einarsson S Maruyama F Sottile K Hannewald V Olevano A G Marinopoulos T Pichler

We have measured a strictly linear pi plasmon dispersion along the axis of individualized single-wall carbon nanotubes, which is completely different from plasmon dispersions of graphite or bundled single-wall carbon nanotubes. Comparative ab initio studies on graphene-based systems allow us to reproduce the different dispersions. This suggests that individualized nanotubes provide viable exper...

2013
Anindya Majumder Maryam Khazaee Jörg Opitz Eckhard Beyer Larysa Baraban Gianaurelio Cuniberti

Here we present a hybrid approach to functionalize multi-walled carbon nanotubes in aqueous solution, exploring a non-covalent binding strategy. We focus on formation of hybrid complexes consisting of carbon nanotubes decorated by single stranded DNA, non-covalently attached using surfactants as intermediate layers. Unlike single walled carbon nanotubes, revealing easy side wall wrapping of DNA...

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