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- W1528432206 abstract "Ultracentrifugation is a well-established technique for Single Wall Carbon Nanotube (SWNT) purification [1,2,3]. It separates various particles into fractions on the basis of sedimentation rate in response to the centrifugal force acting on them. There are two main approaches to ultracentrifugation: sedimentationbased separation (SBS) and isopycnic separation, also known as Density Gradient Ultracentrifugation (DGU). The former discriminates particles by their difference in mass. The latter exploits subtle density differences between particles in a density gradient medium. Here we demonstrate high yield production of liquid phase exfoliated graphene [4] by mild-sonication of graphite in aqueous solution of sodium deoxycholate (SDC), followed by ultracentrifugation-based separation. In particular, we compare SBS and DGU to obtain dispersions highly enriched in monolayer and few layer graphene [5] .Transmission electron microscopy (TEM) and Raman spectroscopy show that ~65% of the flakes produced by SBS are monolayers with average size of ~600nm 2 [6,7]. DGU, besides sorting flakes by number of layers, allows us to obtain larger flakes with respect to SBS. The sorting strategy relies on the 'creation' of density differences between graphite flakes with different number of layers [8]. In addition to stabilizing the hydrophobic graphitic flakes in water, surfactants provide the variation of buoyant density dependent on the flake thickness (Fig. a). We show that sorting by number of layers is strongly affected by the flake surface/volume ratio and the coverage and clustering (aggregation properties) of the surfactant molecules (Fig. b). Bile salts and polymers provide better surface coverage compared to linear chain surfactants resulting in superior DGU separation. SDC bile salts show the best efficiency in exfoliation and sorting, with ~60% of the flakes in the topmost fraction being monolayers." @default.
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- W1528432206 date "2011-01-01" @default.
- W1528432206 modified "2023-09-30" @default.
- W1528432206 title "Sedimentation-based and Isopycnic Separation of Liquid Phase Exfoliated Graphene Layers" @default.
- W1528432206 hasPublicationYear "2011" @default.
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