Results 211 to 220 of about 14,316 (260)

Comparing in vitro cytotoxicity of graphite, short multi-walled carbon nanotubes, and long multi-walled carbon nanotubes

Environmental Science and Pollution Research, 2020
Occupational and environmental exposures to carbon-based materials in nano- and micro-size have been reported. There is incomplete information on the impact of size on the toxicity of carbon-based materials. The objective of this study is to compare the toxicity of graphite, short multi-walled carbon nanotubes (S-MWCNTs), and long multi-walled carbon ...
Mansour Rezazadeh Azari, Yousef Mohammadian   +1 more
openaire   +2 more sources

Respiratory toxicity of multi-wall carbon nanotubes

Toxicology and Applied Pharmacology, 2005
Carbon nanotubes focus the attention of many scientists because of their huge potential of industrial applications, but there is a paucity of information on the toxicological properties of this material. The aim of this experimental study was to characterize the biological reactivity of purified multi-wall carbon nanotubes in the rat lung and in vitro.
Julie, Muller, François, Huaux, Nicolas, Moreau, Pierre, Misson, Jean-François, Heilier, Monique, Delos, Mohammed, Arras, Antonio, Fonseca, Janos B, Nagy, Dominique, Lison   +9 more
openaire   +2 more sources

Optoelectronic modulation by multi-wall carbon nanotubes

Nanotechnology, 2013
We report the observation of photoconduction and a strong nonlinear optical absorptive response exhibited by multi-wall carbon nanotubes. An aerosol pyrolysis method was employed for the preparation of the samples. Measurements of the optical transmittance with 7 ns pulses at 1064 nm wavelength allowed us to identify a two-photon absorption effect as ...
C, Torres-Torres, N, Peréa-López, H, Martínez-Gutiérrez, M, Trejo-Valdez, J, Ortíz-López, M, Terrones   +5 more
openaire   +2 more sources

Electrical Characterization of Multi-Walled Carbon Nanotubes

Journal of Nanoscience and Nanotechnology, 2010
Electrical characteristics of multi-walled carbon nanotubes (MWNTs) grown by chemical vapor deposition have been investigated as a function of the bias voltage, nanotubes length and temperature, in 2 and 4 terminal configurations. Nanotubes were deposited over metal electrodes using ac dielectrophoresis method. For better contacts between the nanotubes
J, León, A, Flacker, A R, Vaz, C, Veríssimo, M B, de Moraes, S A, Moshkalev   +5 more
openaire   +2 more sources

Multi-walled carbon nanotube-based RF antennas

Nanotechnology, 2009
A novel application that utilizes conductive patches composed of purified multi-walled carbon nanotubes (MWCNTs) embedded in a sodium cholate composite thin film to create microstrip antennas operating in the microwave frequency regime is proposed. The MWCNTs are suspended in an adhesive solvent to form a conductive ink that is printed on flexible ...
Taha A, Elwi, Hussain M, Al-Rizzo, Daniel G, Rucker, Enkeleda, Dervishi, Zhongrui, Li, Alexandru S, Biris   +5 more
openaire   +2 more sources

Bio-functionalization of multi-walled carbon nanotubes

Physical Chemistry Chemical Physics, 2013
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.
Anindya, Majumder, Maryam, Khazaee, Jörg, Opitz, Eckhard, Beyer, Larysa, Baraban, Gianaurelio, Cuniberti   +5 more
openaire   +2 more sources

Multi-Walled Carbon Nanotubes

2013
Multi-walled carbon nanotubes (MWCNTs) are elongated cylindrical nanoobjects made of sp2 carbon. Their diameter is 3–30 nm and they can grow several cm long, thus their aspect ratio can vary between 10 and ten million. They can be distinguished from single-walled carbon nanotubes on the basis of their multi-walled Russian-doll structure and rigidity ...
Kukovecz Ákos, Kozma Gábor, Kónya Zoltán   +2 more
openaire   +2 more sources

Magnetic Properties of Multi-Walled Carbon Nanotubes

Journal of Nanoscience and Nanotechnology, 2009
The magnetic properties of multiwall carbon nanotubes (MWCNTs) grown by microwave plasma enhanced chemical vapor deposition (MPECVD) were studied by electron paramagnetic resonance and magnetization measurements. The ferromagnetic characters of virgin grown MWCNTs are mainly attributed to the catalyst nanoparticles embedded on the tips.
Lun-Wei, Chang, Juh-Tzeng, Lue
openaire   +2 more sources

CESR in multi walled carbon nanotubes

Physica E: Low-dimensional Systems and Nanostructures, 2003
Abstract We have clarified carrier spin relaxation process in multi walled carbon nanotubes (MWCNT) fabricated by DC arc discharge and studied the fundamental transport mechanism in MWCNT by means of electron spin resonance (ESR) in order to discuss on the transport properties in the MWCNT.
Satoshi Ishii, Nobuyuki Aoki, Koichirou Miyamoto, Nobuko Oguri, Kazunaga Horiuchi, Yuichi Ochiai   +5 more
openaire   +1 more source

Cutting of multi walled carbon nanotubes

Applied Surface Science, 2006
Abstract Multi walled carbon nanotubes (MCNT) synthesized by CVD method have been successfully cut into different lengths by controlling H2SO4/HNO3 (5:3) oxidation time. During the cutting process H2SO4 and HNO3 were added independently and the oxidation processes were carried out at a lower temperature to void excess weight loss and damage to MCNT ...
Jinyong Li, Yafei Zhang
openaire   +1 more source