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Silica-based nanospheres, nanowires, nanosubstrates, nanotubes, and nanofiber arrays

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Abstract.

Silica-based nanospheres, nanosphere wire-like agglomerates, nanotubes, and nanofiber arrays, bi- and coaxial SiC/SiO2 nanowires, and silica nanosubstrates have been generated and their structural, mechanical, and catalytic properties examined. Nearly monodisperse SiO2 nanospheres of diameter ≤30 nm have been synthesized in gram quantities and used to sequester active copper sites for the selective catalytic conversion of ethanol to acetaldehyde in a process that is at least three times more efficient than that which uses fumed silica produced from the flame hydrolysis of silicon tetrachloride. A Ni(III) solution has been reduced in an electroless process on the surface of the nanospheres, producing a ferromagnetic crystalline nickel coating of variable thickness. Partially agglomerated SiO2 nanospheres of diameter ∼45 nm have been used as nanosubstrates for SnOx crystallites of diameter 3–6 nm. The agglomeration of smaller nanospheres (d≤10 nm) to wire-like configurations has suggested the means to grow silica nanotubes and to produce unique silica nanofiber arrays. Generated silica nanotubes may fill an existing need for the catalytic conversion of high molecular weight hydrocarbons (MW∼1000). Both coaxial and side-by-side biaxially structured silicon carbide-silica nanowires have now also been generated from C/Si/SiO2 mixtures. The structure of these nanowires, their cross-sectional shape, and their structural transformation between a biaxial and coaxial configuration have been studied. The Young's modulus of the biaxially structured nanowires has been measured to be 50–100 GPa, depending on the size of the nanowires.

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  1. Schools of Physics, Material Science and Chemical Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA

    James L. Gole, Z. L. Wang, Z. R. Dai, J. Stout & Mark White

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  1. James L. Gole
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  2. Z. L. Wang
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  3. Z. R. Dai
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  4. J. Stout
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Correspondence to James L. Gole.

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Gole, J.L., Wang, Z.L., Dai, Z.R. et al. Silica-based nanospheres, nanowires, nanosubstrates, nanotubes, and nanofiber arrays. Colloid Polym Sci 281, 673–685 (2003). https://doi.org/10.1007/s00396-002-0819-4

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  • DOI: https://doi.org/10.1007/s00396-002-0819-4

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