Synthesis and reactivity of nano-Ag₂O as an oxidizer for energetic systems yielding antimicrobial products

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• 作者：Kyle T. Sullivan ; Chunwei Wu ; Nicholas W. Piekiel ; Karen Gaskell ; Michael R. Zachariah ; ^mrz@umd.edu
• 关键词：Energetic materials ; Biocide ; Pressure cell ; Time resolved mass spectrometry ; Nanoaluminum ; Synthesis
• 刊名：Combustion and Flame
• 出版年：2013
• 出版时间：February, 2013
• 年：2013
• 卷：160
• 期：2
• 页码：438-446
• 全文大小：1042 K

文摘

This work investigated Ag₂O as a potential oxidizer in antimicrobial energetic systems. Ultrafine Ag₂O was synthesized, and its performance in nanoaluminum-based thermite systems was evaluated using a constant volume combustion cell. The Ag₂O alone was found to be a relatively poor oxidizer, but it performed well when blended with more reactive oxidizers, CuO and AgIO₃. Time-resolved mass spectrometry was used to investigate the reaction mechanism in more detail. Post-reaction analysis confirmed the production of Ag, but it was seen to exist in a matrix with Cu in the Al/CuO/Ag₂O ternary system. The product in surface contact with Al₂O₃ suggested a reactive sintering mechanism occurred. The results indicate that Ag₂O, while a poor oxidizer itself, can be integrated into more reactive systems to produce high yields of biocidal silver. The morphology of the final product, however, indicates that a large amount of the silver may not be surface-exposed, a result which would negatively impact the biocidal activity.