ausblenden:
Schlagwörter:
Al-water reaction; Aluminum powders; Aluminum-water reactions; Conventional furnace; Gibbsites; Milling time; Room temperature; Wet milling, Alumina; Ball milling; Calcination; Hydrated alumina; Hydrogen; Milling (machining); Morphology; Nanorods; Rietveld refinement; Scanning electron microscopy; X ray diffraction, Aluminum, aluminum hydroxide; aluminum hydroxide nanoparticle; aluminum oxide; hydrogen; nanomaterial; nanoparticle; nanorod; nanosphere; nanospindle; unclassified drug, aluminum water reaction; article; ball milling; calcination; chemical modification; chemical procedures; chemical reaction; furnace; high temperature procedures; microwave oven; nanotechnology; particle size; Rietveld refinement; room temperature; scanning electron microscopy; structure analysis; X ray diffraction
Zusammenfassung:
Al-water reaction is used to produce nanoparticles of aluminum hydroxide. Ball-milling of aluminum powder in water was examined for promoting this reaction. Scanning electron microscopy and X-ray diffraction assisted by Rietveld refinement were used to study the by-products of the reaction. Results showed that the activated Al powder completely reacted with water at room temperature. Hydrogen, gibbsite and bayerite were formed at the end of the reaction. A mechanism is proposed to explain how wet milling of Al powder can promote the reaction. The morphology of the by-products changed with the milling time. Notably the samples milled for 7 and 12. h had the shapes of nanospheres, nanospindles and nanorods. The calcination process made in conventional furnace and microwave oven changed the morphology of the produced alumina phases. © 2013 Elsevier B.V.