Conversion of Mg-Li Bimetallic Alloys to Magnesium Alkoxide and Magnesium Oxide Ceramic Nanowires.

Author(s) Luo, S.; Turcheniuk, K.; Song, A.Y.; Narla, A.; Kim, D.; Yushin, G.
Journal Angew Chem Int Ed Engl
Date Published 2019 Oct 11

Technologically important composites with enhanced thermal and mechanical properties rely on the reinforcement by the high specific strength ceramic nanofibers or nanowires (NWs) with high aspect ratios. However, conventional synthesis routes to produce such ceramic NWs have prohibitively high cost, thus making them unsuitable for most industrial applications. Here we demonstrate a revolutionary direct transformation of bulk Mg-Li alloys into Mg alkoxide NWs without the use of catalysts, templates, expensive or toxic chemicals or any external stimuli. This mechanism proceeds through the minimization of strain energy at the boundary of phase transformation front leading to the formation of ultra-long NWs with tunable dimensions. Such alkoxide NWs can be easily converted in air into ceramic MgO NWs. We discuss the impacts of the alloy grain size and Li content, synthesis temperature, inductive and steric effects of alkoxide groups on the diameter, length, composition, ductility and oxidation of the produced NWs. The reported approach opens new avenues for multiple low-cost synthesis routes of NWs with tunable composition and morphology for their use in nanofiber-reinforced composites and other applications.

DOI 10.1002/anie.201910141
ISSN 1521-3773
Citation Angew Chem Int Ed Engl. 2019.

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