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National Science Foundation ‘Seeing’ Gas at the Nanoscale Shen Dillon, University of Illinois at Urbana- Champaign, DMR 0906874 Outcome : Imaged gas phase dynamics at the nanoscale for the first time and provided insight into the oxidation (‘rusting’) process of silver in ionized gas (e.g. O 2 split into ions in an electron microscope). Impact : Reactions in ionized gas can be important environmental limiting factors in space travel and certain types of reactors. Improved understanding of oxidation and mass transport under such conditions may lead to new materials optimized for these environments. Explanation : The video shows silver oxidizing in the presence of ionized gas. The heat evolved in the reaction causes the silver oxide to vaporize, but silver oxide vapor is not stable and silver particle re- precipitate. The dynamics of the gas may be observed in real time. Silver 50 nm 2X Speed

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‘Seeing’ Gas at the Nanoscale Shen Dillon , University of Illinois at Urbana-Champaign, DMR 0906874. - PowerPoint PPT Presentation

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DMR FY 2013 Activities

Seeing Gas at the NanoscaleShen Dillon, University of Illinois at Urbana-Champaign, DMR 0906874Outcome: Imaged gas phase dynamics at the nanoscale for the first time and provided insight into the oxidation (rusting) process of silver in ionized gas (e.g. O2 split into ions in an electron microscope). Impact: Reactions in ionized gas can be important environmental limiting factors in space travel and certain types of reactors. Improved understanding of oxidation and mass transport under such conditions may lead to new materials optimized for these environments.Explanation: The video shows silver oxidizing in the presence of ionized gas. The heat evolved in the reaction causes the silver oxide to vaporize, but silver oxide vapor is not stable and silver particle re-precipitate. The dynamics of the gas may be observed in real time. Silver in the gas phase scatters electrons more strongly than the other gas present. This allows the process to be imaged directly.

50 nm2X Speed National Science FoundationNational Science FoundationPublic HighlightThe slide shows a video of silver oxidizing in ionized gas (primarily O2 from dry air). The reaction evolves enough heat to eventually induce vaporization where the silver oxide gas is then directly imaged. Reference information may be found at: DOI: 10.1021/la202949c Li et al. Langmuir 27[23] 2011.1


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