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Possible relations between supercooled and glassy confined water and amorphous bulk ice

机译:过冷和玻璃间的可能性密集的水和无定形散装冰

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摘要

In this paper we discuss apparent contradictions in the literature between dynamical results on supercooled confined water obtained by different experimental methods. The reason for the lack of a clear glass transition of confined water is also discussed. Dielectric relaxation data and results from differential scanning calorimetry measurements provide a consistent picture, but it is still unclear why the glass transition related structural () relaxation disappears before the normal time-scale of a calorimetric glass transition (i.e. about 100 s) is reached. From recent results on amorphous bulk ice we propose that this anomalous phenomenon may not be an effect of confinement, but an intrinsic property of water when it transforms to a crystal-like glassy state, probably around 225 K. Thus, the results from the studies of confined water in the so-called no man's land (the temperature range 150-235 K) where bulk water rapidly crystallizes may be of more relevance for supercooled and glassy bulk water than previously thought. Furthermore, the structural difference between glassy water (or amorphous ice) and crystalline ice is likely to be rather small, due to the large degree of disorder in crystalline ice.
机译:在本文中,我们讨论了通过不同实验方法获得的过冷限制水的动态结果之间的文献中的明显矛盾。还讨论了缺乏透明玻璃过渡的限制水的原因。介电弛豫数据和差示扫描量热法测量的结果提供了一致的图片,但尚不清楚为什么玻璃过渡相关的结构()弛豫在达到量热玻璃过渡的正常时间尺度之前消失(即约100秒)。从最近的非晶散冰的结果我们建议这种异常现象可能不是禁闭的影响,而是当它转变为晶状玻璃状态时的水的内在特性,可能大约在225k左右。因此,研究结果在所谓的没有人的土地(温度范围为150-235 k)中的狭窄水,其中大部分水迅速结晶可能比以前思想的过冷和玻璃散装水更相关。此外,由于结晶冰的紊乱程度,玻璃水(或无定形冰)和结晶冰之间的结构差异可能是相当小的。

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