Effects of methanol on crystallization of water in the deeply supercooled region
Effects of methanol on crystallization of water in the deeply supercooled region
复制标题
甲醇对深度过冷区水结晶的影响
DOI：
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
R. Souda
中科院分区：
文献类型：
--
作者：
R. Souda
The interaction of water with adsorbed methanol and butane is investigated and the crystallization mechanism of deeply supercooled water is discussed. Amorphous solid water becomes viscous liquid at temperatures greater than $136\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and then a more fluidized liquid phase appears at $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, thereby engendering film dewetting. Crystallization occurs only in the dewetted films as revealed from the abrupt redshift and narrowing of the infrared absorption band. If methanol is incorporated in the bulk of water, crystallization occurs at lower temperatures $(152\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ because water is nucleated by methanol. The crystallization in the viscous liquid phase $(136\phantom{\rule{0.3em}{0ex}}\mathrm{K}lTl165\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ is thought to be quenched without such nuclei, whereas spontaneous nucleation occurs in supercooled liquid water that appears at $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The butane molecules, which are hydrated in the bulk of amorphous solid water, are released almost completely up to $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, although this dehydration channel is suppressed considerably if crystallization is induced by methanol. It is therefore suggested that butane dehydration is related to the phase transition of liquidlike water rather than crystallization.
The interaction of water with adsorbed methanol and butane is investigated and the crystallization mechanism of deeply supercooled water is discussed. Amorphous solid water becomes viscous liquid at temperatures greater than $136\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and then a more fluidized liquid phase appears at $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, thereby engendering film dewetting. Crystallization occurs only in the dewetted films as revealed from the abrupt redshift and narrowing of the infrared absorption band. If methanol is incorporated in the bulk of water, crystallization occurs at lower temperatures $(152\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ because water is nucleated by methanol. The crystallization in the viscous liquid phase $(136\phantom{\rule{0.3em}{0ex}}\mathrm{K}lTl165\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ is thought to be quenched without such nuclei, whereas spontaneous nucleation occurs in supercooled liquid water that appears at $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The butane molecules, which are hydrated in the bulk of amorphous solid water, are released almost completely up to $165\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, although this dehydration channel is suppressed considerably if crystallization is induced by methanol. It is therefore suggested that butane dehydration is related to the phase transition of liquidlike water rather than crystallization.