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Exploring Gas–Liquid Reactions with Microjets: Lessons We Are Learning
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2022-11-15 , DOI: 10.1021/acs.accounts.2c00602
Xiao-Fei Gao 1 , Gilbert M Nathanson 1
Affiliation  

Liquid water is all around us: at the beach, in a cloud, from a faucet, inside a spray tower, covering our lungs. It is fascinating to imagine what happens to a reactive gas molecule as it approaches the surface of water in these examples. Some incoming molecules may first be deflected away after colliding with an evaporating water molecule. Those that do strike surface H2O or other surface species may bounce directly off or become momentarily trapped through hydrogen bonding or other attractive forces. The adsorbed gas molecule can then desorb immediately or instead dissolve, passing through the interfacial region and into the bulk, perhaps diffusing back to the surface and evaporating before reacting. Alternatively, it may react with solute or water molecules in the interfacial or bulk regions, and a reaction intermediate or the final product may then desorb into the gas phase. Building a “blow by blow” picture of these pathways is challenging for vacuum-based techniques because of the high vapor pressure of water. In particular, collisions within the thick vapor cloud created by evaporating molecules just above the surface scramble the trajectories and internal states of the gaseous target molecules, hindering construction of gas–liquid reaction mechanisms at the atomic scale that we strive to map out.

中文翻译:

用微射流探索气液反应:我们正在吸取的教训

液态水无处不在:在海滩上,在云中,从水龙头里,在喷雾塔里,覆盖着我们的肺。在这些例子中,想象当反应气体分子接近水面时会发生什么是很有趣的。一些进入的分子在与蒸发的水分子碰撞后可能首先被偏转。那些撞击表面 H 2O 或其他表面物质可能会直接反弹或通过氢键或其他吸引力暂时被捕获。然后吸附的气体分子可以立即解吸或溶解,穿过界面区域进入主体,可能扩散回​​表面并在反应前蒸发。或者,它可以与界面或本体区域中的溶质或水分子反应,然后反应中间体或最终产物可以解吸到气相中。由于水的高蒸气压,建立这些路径的“逐个”图对于基于真空的技术具有挑战性。特别是,在表面上方蒸发分子产生的厚蒸汽云内的碰撞扰乱了气态目标分子的轨迹和内部状态,
更新日期:2022-11-15
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