نتایج جستجو برای: long carbon nanotubes

تعداد نتایج: 1044023  

احمدی بروغنی, سیدیوسف, یزدانی, داود,

In this study, a three-dimensional finite element (FE) model for armchair, zigzag and chiral single-walled carbon nanotubes (SWCNTs) is proposed. To create the FE models, nodes are placed at the locations of carbon atoms and the bonds between them are modeled using three-dimensional elastic beam elements. The FE model is used to investigate the influence of chirality and Stone-Wales defects on ...

2009
Jessica P. Ryman-Rasmussen Mark F. Cesta Arnold R. Brody Jeanette K. Shipley-Phillips Jeffrey Everitt Earl W. Tewksbury Owen R. Moss Brian A. Wong Darol E. Dodd Melvin E. Andersen James C. Bonner

Carbon nanotubes are shaped like fibres and can stimulate inflammation at the surface of the peritoneum when injected into the abdominal cavity of mice, raising concerns that inhaled nanotubes may cause pleural fibrosis and/or mesothelioma. Here, we show that multiwalled carbon nanotubes reach the subpleura in mice after a single inhalation exposure of 30 mg m(-3) for 6 h. Nanotubes were embedd...

Journal: :journal of sciences, islamic republic of iran 2015
m. karimi a. badiei p. zarabadi-poor

we evaluated the effect of fe/alumina catalyst contained different cadmium contents and two synthesis temperatures on producing carbon nanotubes by chemical vapor deposition of methane as a feedstock.  x-ray powder diffraction (xrd), n2 adsorption-desorption, scanning electron microscopy (sem), transmission electron microscopy (tem), raman spectroscopy and thermogravimetry analysis (tga) were u...

Journal: :international journal of nanoscience and nanotechnology 2012
m. kolangikhah m. maghrebi k. ghazvini n. farhadian

in this study, salmonella typhimurium bacteria removal from polluted water has been investigated using multiwall carbon nanotubes arrays. experimental results reveal that the contact time, the bacterial concentration and the weight of multiwall carbon nanotubes arrays have positive significant effects on the bacteria removal efficiency. increasing the contact time and the weight of multiwall ca...

Journal: :international journal of nanoscience and nanotechnology 2007
abdullah keyvani

in spite of the fact that cementitious and concrete materials are mainly used on a large scale and inhuge quantities for roads, dams, bridges and building constructions, the mechanical behavior of thesematerials depends to a great extend on structural elements and phenomena which are effective on amicro and nanoscale. although this is well known by researchers, material producers and engineersf...

2004
J. Hone P. Kim B. H. Hong T. Someya L. Huang S. O’Brien C. P. Nuckolls

ABSRACT We have used a number of methods to grow long aligned single-walled carbon nanotubes. Geometries include individual long tubes, dense parallel arrays, and long freely suspended nanotubes. We have fabricated a variety of devices for applications such as multiprobe resistance measurement and high-current field effect transistors. In addition, we have measured conductance of single-walled ...

2006
Markus J. Buehler

Using concepts of hierarchical multi-scale modeling, we report development of a mesoscopic model for single wall carbon nanotubes with parameters completely derived from full atomistic simulations. The parameters in the mesoscopic model are fit to reproduce elastic, fracture and adhesion properties of carbon nanotubes, in this article demonstrated for (5,5) carbon nanotubes. The mesoscale model...

Journal: :Nano letters 2010
Ana Laura Elías Andrés R Botello-Méndez David Meneses-Rodríguez Viviana Jehová González Daniel Ramírez-González Lijie Ci Emilio Muñoz-Sandoval Pulickel M Ajayan Humberto Terrones Mauricio Terrones

We report the use of transition metal nanoparticles (Ni or Co) to longitudinally cut open multiwalled carbon nanotubes in order to create graphitic nanoribbons. The process consists of catalytic hydrogenation of carbon, in which the metal particles cut sp(2) hybridized carbon atoms along nanotubes that results in the liberation of hydrocarbon species. Observations reveal the presence of unzippe...

Journal: :international journal of bio-inorganic hybrid nanomaterials 0

in this work, the first in the world of science, the focus was on the best angle of connection between carbon nanotubes and the most widely used group of antibiotics. while having the highest stability, in terms of energy, we have the best angle of to connect to the in vivo delivery of intraoperative antibiotic binding with carbon nanotubes not lost. it will never work in the world of science. ...

Journal: :Philosophical transactions. Series A, Mathematical, physical, and engineering sciences 2007
Takuzo Aida Takanori Fukushima

This review article focuses on our recent studies on novel soft materials consisting of carbon nanotubes. Single-walled carbon nanotubes, when suspended in imidazolium ion-based ionic liquids and ground in an agate mortar, form physical gels (bucky gels), where heavily entangled bundles of carbon nanotubes are exfoliated to give highly dispersed, much finer bundles. By using bucky gels, the fir...

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