Search results for "Potential applications"

showing 5 items of 5 documents

Undergraduate experiment with fractal diffraction gratings

2011

We present a simple diffraction experiment with fractal gratings based on the triadic Cantor set. Diffraction by fractals is proposed as a motivating strategy for students of optics in the potential applications of optical processing. Fraunhofer diffraction patterns are obtained using standard equipment present in most undergraduate physics laboratories and compared with those obtained with conventional periodic gratings. It is shown that fractal gratings produce self-similar diffraction patterns which can be evaluated analytically. Good agreement is obtained between experimental and numerical results. © 2011 IOP Publishing Ltd.

DiffractionPhysics::OpticsGeneral Physics and Astronomysymbols.namesakeOpticsFractalSelf-similarDiffraction gratingPhysicsOptical processingScience instructionUndergraduate experimentPotential applicationsbusiness.industryPeriodic gratingsDiffraction patternsCantor setsOptical processingFraunhofer diffractionCantor setInterferometryPhysics laboratoriesFractalsInterferometryStandard equipmentsFISICA APLICADAsymbolsNumerical resultsDiffraction gratingsFraunhofer diffraction patternsbusinessExperiments
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The diffusion of carbon atoms inside carbon nanotubes

2008

We combine electron irradiation experiments in a transmission electron microscope with kinetic Monte Carlo simulations to determine the mobility of interstitial carbon atoms in single-walled carbon nanotubes. We measure the irradiation dose necessary to cut nanotubes repeatedly with a focused electron beam as a function of the separation between the cuts and at different temperatures. As the cutting speed is related to the migration of displaced carbon atoms trapped inside the tube and to their recombination with vacancies, we obtain information about the mobility of the trapped atoms and estimate their migration barrier to be about 0.25 eV. This is an experimental confirmation of the remar…

General Physics and Astronomychemistry.chemical_elementMechanical properties of carbon nanotubes02 engineering and technologyCarbon nanotube114 Physical sciences01 natural sciencesMolecular physicslaw.inventionCondensed Matter::Materials SciencePotential applications of carbon nanotubeslaw0103 physical sciencesElectron beam processingPhysics::Atomic Physics010306 general physicsCondensed Matter::Quantum GasesPhysicsCarbon nanofiber021001 nanoscience & nanotechnologyOptical properties of carbon nanotubeschemistryBallistic conduction in single-walled carbon nanotubesAtomic physics0210 nano-technologyCarbonNew Journal of Physics
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Filling carbon nanotubes with magnetic particles

2013

Magnetic carbon nanotube composites were obtained by filling carbon nanotubes with paramagnetic iron oxide particles. Measurements indicate that these functionalized nanotubes are superparamagnetic at room temperature. Details about the production and characterization of these materials are described along with the experimental procedures employed. These magnetic carbon nanotubes have the potential to be used in a wide range of applications, in particular, the production of nanofluids, which can be controlled by appropriate magnetic fields.

Materials scienceCarbon nanofiberCarbon nanotube actuatorsMechanical properties of carbon nanotubesNanotechnology02 engineering and technologyGeneral ChemistryCarbon nanotube010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesCAPILLARITY0104 chemical scienceslaw.inventionOptical properties of carbon nanotubesCondensed Matter::Materials ScienceCarbon nanobudPotential applications of carbon nanotubeslawCHEMISTRYMaterials ChemistryNANOPARTICLESMagnetic nanoparticles0210 nano-technology
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Electrical conductance of carbon nanotubes with misaligned ends

2013

During a manufacturing process, when a straight carbon nanotube is placed on a substrate, e.g., production of transistors, its two ends are often misaligned. In this study, we investigate the effects of multiwall carbon nanotubes’ (MWCNTs) outer diameter and chirality on the change in conductance due to misalignment of the two ends. The length of the studied MWCNTs was 120 nm, while the diameters ranged between 4 and 7 nm. A mixed finite element-tight-binding approach was carefully designed to realize reduction in computational time by orders of magnitude in calculating the deformation-induced changes in the electrical transport properties of the nanotubes. Numerical results suggest that ar…

Materials scienceCarbon nanotube actuatorsBioengineeringMechanical properties of carbon nanotubesGeneral ChemistryCarbon nanotubeCondensed Matter PhysicsAtomic and Molecular Physics and OpticsCarbon nanotubes Electromechanical behavior Transport Properties Numerical Methodslaw.inventionSettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineCarbon nanobudZigzagElectrical resistance and conductancePotential applications of carbon nanotubeslawModeling and SimulationGeneral Materials ScienceBallistic conduction in single-walled carbon nanotubesComposite material
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Cutting single-walled carbon nanotubes with an electron beam: evidence for atom migration inside nanotubes.

2006

Materials scienceMechanical properties of carbon nanotubesElectronsCarbon nanotubeElectronMolecular physicslaw.inventionBiomaterialsPotential applications of carbon nanotubesMicroscopy Electron TransmissionlawAtomMaterials TestingElectrochemistryNanotechnologyGeneral Materials ScienceNanotubesCarbon nanofiberNanotubes CarbonTemperatureGeneral ChemistryCarbonOptical properties of carbon nanotubesMicroscopy ElectronElectron microscopeCrystallizationBiotechnologySmall (Weinheim an der Bergstrasse, Germany)
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