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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >NMR evidence of a sharp change in a measure of local order in deeply supercooled confined water
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NMR evidence of a sharp change in a measure of local order in deeply supercooled confined water

机译：核磁共振证据表明，深度过冷的承压水中局部有序量的急剧变化

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摘要

Using NMR, we measure the proton chemical shift δ, of supercooled nanoconfined water in the temperature range 195 K < T < 350 K. Because δ is directly connected to the magnetic shielding tensor, we discuss the data in terms of the local hydrogen bond geometry and order. We argue that the derivative -(pattial deriv In δ/pattial deriv T)_p should behave roughly as the constant pressure specific heat C_p(T), and we confirm this argument by detailed comparisons with literature values of C_p(T) in the range 290-370 K. We find that -(pattial deriv In δ/pattial deriv)_p displays a pronounced maximum upon crossing the locus of maximum correlation length at ≈240 K, consistent with the liquid-liquid critical point hypothesis for water, which predicts that C_p(T) displays a maximum on crossing the Widom line.
机译：使用NMR，我们测量了195 K

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