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    ABSTRACT: Using positron emission particle tracking (PEPT), the influence of system geometry on the dynamical and segregative properties of a three dimensional, vibrofluidised granular system is explored. A relationship between the aspect ratio of a system and the degree of segregation observed is established, demonstrating the ability to adjust segregation intensity within a system simply by modifying its aspect ratio without altering any other parameters, including the number of particles within the system, its volume and the manner in which it is driven. Such a relationship is potentially of value in future research, as well as in industrial settings. The range over which this relationship is valid is determined in terms of the quantity q, the ratio of heating to cooling events within an excited granular system. Within this range, a relationship between self-diffusion, D, and aspect ratio, A, of the form D = alpha exp (beta A(gamma)) is also proposed. Finally, this study presents what is believed to be the first experimental evidence of sudden chain energy transfer events, a phenomenon recently discovered in two-dimensional granular beds, in a three-dimensional system.
    No preview · Article · Jul 2014 · Powder Technology
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    ABSTRACT: We report the size-dependent propagation of gold nanoclusters through few-layer graphene (FLG). We employ aberration-corrected scanning transmission electron microscopy (STEM) to track the fate of Au55 and Au923 clusters that have been deposited, independently and isoenergetically, onto suspended FLG films using cluster beam deposition. We demonstrate that Au55 clusters penetrate through the FLG, whereas the monodisperse Au923 clusters reside at the surface. Our approach offers a route to the controlled incorporation of dopant nanoparticles and the generation of nanoscale defects in graphene.
    Full-text · Article · Nov 2013 · Nanoscale
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    ABSTRACT: We report the assembly of magic number (C_{60})_{m}-(Au)_{n} complexes on the Au(111) surface. These complexes have a unique structure consisting of a single atomic layer Au island wrapped by a self-selected number (seven, ten, or twelve) of C_{60} molecules. The smallest structure consisting of 7 C_{60} molecules and 19 Au atoms, stable up to 400 K, has a preferred orientation on the surface. We propose a globalized metal-organic coordination mechanism for the stability of the (C_{60})_{m}-(Au)_{n} complexes.
    Full-text · Article · Nov 2013 · Physical Review Letters
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Advanced Materials 02/2016; DOI:10.1002/adma.201504532
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