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Journal of Alloys and Compounds, Volume 554, 25 March 2013, Pages 426-431.
Giorgio Ligios, Andrea Manuello Bertetto, Francesco Delogu
Dipartimento di Ingegneria Meccanica, Chimica e dei Materiali, Università degli Studi di Cagliari, piazza d’Armi, I-09123 Cagliari, Italy
Abstract
The present work focuses on the chemical response of Ag oxalate powders to the collision of rods in controlled rod drop experiments performed by using suitably designed reactors. Powder layers of different thickness were submitted to the collision of cylindrical rods with selected radius, mass, and collision velocity. The experimental findings indicate that collisions are able to induce the partial decomposition of Ag oxalate into metallic Ag and gaseous carbon dioxide. The mass of Ag oxalate decomposed is proportional to the collision energy. Being the impact energy the same, the mass decomposed is inversely proportional to the surface area of the powder layer. In addition, it increases irregularly as the thickness of the powder layer increases. The results obtained suggest that rod drop experiments can be profitably used to promote and investigate mechanochemical transformations.
