Carbon Nanostructures
Mostrando 37-42 de 42 artigos, teses e dissertações.
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37. Estrutura e dinamica de nanofitas de carbono / Structure and dynamics of carbon nanobelts
Apresenta-se neste trabalho um estudo teórico baseado em uma nova familia de nanoestruturas de carbono, as chamadas nanofitas de carbono. Estas consistem em fitas delgadas de grafeno com a singular característica de possuírem uma conformação de equilíbrio na forma espiral, a qual pode ser mais estável que a conformação planar, viabilizada pelo delic
Publicado em: 2006
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38. Synthesis of carbon nanostructures by using thermal plasma torch
Some recent results concerning the synthesis of carbon nanostructures in a thermal plasma generating by a plasma torch are presented. Several tests were carried out in different operational conditions. The plasma was formed with argon and different gas mixtures of argon-acetylene or argon-methane to which some catalyst materials (ferrocene and cerium oxide)
Brazilian Journal of Physics. Publicado em: 2004-12
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39. Carbon based nanostructures: diamond clusters structured with nanotubes
Feasibility of designing composites from carbon nanotubes and nanodiamond clusters is discussed based on atomistic simulations. Depending on nanotube size and morphology, some types of open nanotubes can be chemically connected with different facets of diamond clusters. The geometrical relation between different types of nanotubes and different diamond facet
Materials Research. Publicado em: 2003-01
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40. Síntese de nanotubos de carbono de parede simples por sublimação de grafite em atmosfera de hélio
Macroscopic samples of fullerene nanostructures are obtained in a modified arc furnace using the electric arc method with a Helium atmosphere at low pressures. High purity graphite rods are used as electrodes but, when drilled and the orifices filled with powders of transition metals (Fe, Co, Ni) acting as catalysts, the resulting particles are carbon nanost
Química Nova. Publicado em: 2002-02
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41. An electromechanical material testing system for in situ electron microscopy and applications
We report the development of a material testing system for in situ electron microscopy (EM) mechanical testing of nanostructures. The testing system consists of an actuator and a load sensor fabricated by means of surface micromachining. This previously undescribed nanoscale material testing system makes possible continuous observation of the specimen deform
National Academy of Sciences.
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42. Graphene nanostructures as tunable storage media for molecular hydrogen
Many methods have been proposed for efficient storage of molecular hydrogen for fuel cell applications. However, despite intense research efforts, the twin U.S. Department of Energy goals of 6.5% mass ratio and 62 kg/m3 volume density has not been achieved either experimentally or via theoretical simulations on reversible model systems. Carbon-based material
National Academy of Sciences.