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Former structural models of graphene oxide (GO) indicated that it consists of graphene-like sheets with oxygen groups, and no attention was paid to the resulting sheet size. We now provide evidence of the complex GO structure consisting of large and small GO sheets (or oxidized debris). Different oxidation reactions were studied. KMnO4 derived GO consists of large sheets (20–30wt.%), and oxidized...
Eight different solvents, of different polarities, were used to prepare carbon nanofiber (CNF)/poly(methyl methacrylate nanocomposites by solvent casting. Selected solvents ranged from organic acetone to nonpolar toluene, passing through N‐containing solvents. In addition, pristine and oxygen and nitrogen‐functionalized CNFs were used. Two objectives were pursued: (1) the role of the solvent in the...
Structural rearrangement of helical-ribbon carbon nanofibers (CNFs) was studied as a function of graphitization temperature. The as-produced nanofibers are composed of a helical ribbon of graphene spiralled about and angled to the fiber axis. The discrete layers of graphene ribbon overlap each other forming the helical-ribbon in contrast to the discontinuous cones of the more common stacked-cup CNF...
New evidence for the structure of Ni-catalyzed stacked-cup carbon nanofibers (CNFs) has been found. This type of carbon nanofiber exhibits a wide hollow core as well as a large diameter (between 40 and 140nm). The fibers have been produced by the floating catalyst method using natural gas as carbon feedstock, a sulfur compound, and a nickel catalyst. It was found that the catalytic particles are heterogeneous...
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