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首页> 外文期刊>Chemical Physics Letters >Clathrate-hydrate ultrafast nucleation and crystallization from supercooled aqueous nanodroplets
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Clathrate-hydrate ultrafast nucleation and crystallization from supercooled aqueous nanodroplets

机译：笼形水合物超快成核和结晶从过冷的水性纳米液滴

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摘要

One of the most vital properties of clathrate hydrates is the rate at which they form from ice or aqueous solutions, or undergo transformations to related structures. It has been established that these rates are often greatly accelerated when one guest species is inclined to form a hydrogen bond with the host lattice water molecules. Low-temperature studies of these accelerated rates suggest that quite phenomenal rates should be observed near 200 K. Here, a method of testing rates of formation of CHs at ～200 K is described. Complete conversion of all available water to CHs on a millisecond timescale has been observed by FTIR spectroscopy as temperatures of warm vapor mixtures drop rapidly to ～100 K in a cold condensation cell. That CH formation completely overrides ice nucleation and crystallization is indicative of the rapidity of the process under the new set of extreme conditions.
机译：包合物水合物最重要的特性之一是它们从冰或水溶液中形成或经历转化为相关结构的速率。已经确定的是，当一种客体物质倾向于与主体晶格水分子形成氢键时，通常会大大加快这些速率。对这些加速速率的低温研究表明，在200 K附近应观察到相当惊人的速率。在此，描述了一种测试〜200 K时CHs形成速率的方法。通过FTIR光谱观察到，在毫秒级的时间内，所有可用水已完全转化为CHs，这是因为在冷冷凝室中，温热的蒸汽混合物的温度迅速下降至约100K。 CH的形成完全凌驾于冰核和结晶之上，这表明在新的极端条件下该过程的快速性。

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