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Efficient synthesis route to quasi - aligned and high - aspect - ratio aluminum nitride micro - and nanostructures / Tae-Hyuk Lee in Chemical engineering journal, Vol. 174 N° 1 (Octobre 2011) 

Public ISBD [article]  in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.461–466 Titre : Efficient synthesis route to quasi - aligned and high - aspect - ratio aluminum nitride micro - and nanostructures Type de document : texte imprimé Auteurs : Tae-Hyuk Lee, Auteur ; Hayk H. Nersisyan, Auteur ; Ha-Guk Jeong, Auteur Année de publication : 2012 Article en page(s) : pp.461–466 Note générale : Génie chimique Langues : Anglais (eng) Mots-clés : Aluminum  nitride  Combustion  synthesis  Ceramic–metal  systems  Composites  ransmission  electron  microscopy Résumé : Quasi-aligned, high-aspect-ratio AlN micro- and nanostructures were synthesized under high nitrogen pressure by the exothermic reaction of an Al + 0.015 mol (C2F4)n mixture. Structurally uniform AlN micro- and nanofibers with hexagonal and cylindrical morphologies were obtained when the system temperature was maintained within the range of 1600–1700 °C. The fibers had aspect ratios as high as 2000, diameters in the range of ∼0.05–20 μm, and were ∼100–1000 μm in length. High-resolution transmission electron microscopic and selected area diffraction analyses indicated that the as-synthesized AlN micro- and nanostructures are perfectly single crystalline with preferential growth along the [0 0 1] direction. Branching was also observed in some of the micro-fibers, giving rise to randomized, two-dimensional comb textures. Based on the results obtained in the present study, a mechanism for the formation of AlN micro- and nanostructures under combustion conditions was proposed. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711011053 [article] Efficient synthesis route to quasi - aligned and high - aspect - ratio aluminum nitride micro - and nanostructures [texte imprimé] / Tae-Hyuk Lee, Auteur ; Hayk H. Nersisyan, Auteur ; Ha-Guk Jeong, Auteur . - 2012 . - pp.461–466. Génie chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 174 N° 1 (Octobre 2011) . - pp.461–466 Mots-clés : Aluminum  nitride  Combustion  synthesis  Ceramic–metal  systems  Composites  ransmission  electron  microscopy Résumé : Quasi-aligned, high-aspect-ratio AlN micro- and nanostructures were synthesized under high nitrogen pressure by the exothermic reaction of an Al + 0.015 mol (C2F4)n mixture. Structurally uniform AlN micro- and nanofibers with hexagonal and cylindrical morphologies were obtained when the system temperature was maintained within the range of 1600–1700 °C. The fibers had aspect ratios as high as 2000, diameters in the range of ∼0.05–20 μm, and were ∼100–1000 μm in length. High-resolution transmission electron microscopic and selected area diffraction analyses indicated that the as-synthesized AlN micro- and nanostructures are perfectly single crystalline with preferential growth along the [0 0 1] direction. Branching was also observed in some of the micro-fibers, giving rise to randomized, two-dimensional comb textures. Based on the results obtained in the present study, a mechanism for the formation of AlN micro- and nanostructures under combustion conditions was proposed. ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science/article/pii/S1385894711011053