S Amelinckx

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The concept of a spatial-velocity hodograph is introduced to describe quantitatively the extrusion of a carbon tubule from a catalytic particle. The conditions under which a continuous tubular surface can be generated are discussed in terms of this hodograph, the shape of which determines the geometry of the initial nanotube. The model is consistent with(More)
fluidic applications as well as nanostructured percolation media. The hollow funnels can also serve as ªnanocruciblesº for metal alloy production, which permit the containment and handling of very small amounts of metals. The latter would be of interest to the field of combinatorial synthesis, for instance, as potential micro/nano arrays for solid-state(More)
A model that postulates a mixture of scroll-shaped and concentric, cylindrical graphene sheets is proposed to explain the microstructure of graphite multishell nanotubes grown by arc discharge. The model is consistent with the observed occurrence of a relatively small number of different chiral angles within the same tubule. The model explains clustering in(More)
Electron microscopic study of the reversible P1 to I1 phase transition in anorthite (transition temperature T(c) = 516 Kelvin) shows that the antiphase boundaries (APBs) with the displacement vector R = 1/2[111] become unstable at T(c), and numerous small APB loops are formed. These interfaces are highly mobile, and their vibration frequency increases(More)
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