Pressure dependence of NMR proton spin–lattice relaxation times and shear viscosity in liquid water in the temperature range −15–10 °C
Pressure dependence of NMR proton spin–lattice relaxation times and shear viscosity in liquid water in the temperature range −15–10 °C
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-15–10 °C 温度范围内液态水中 NMR 质子自旋晶格弛豫时间和剪切粘度的压力依赖性
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
J. Jonas
中科院分区：
文献类型：
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作者：
T. DeFries;J. Jonas
核磁共振质子自旋-晶格弛豫时间t1和剪切粘度在温度区间−15-10 °C内作为压力的函数被测量。在低温下，实验的低压边界是冰I，而冰V代表我们测量的高压极值。在我们研究的所有温度下的初始压缩导致水分子的运动自由度更高，因此压力依赖关系表现出最小的粘度和最大的t1。这是由于压缩导致氢键网络严重扭曲的结果，这似乎也削弱了氢键。由于分子堆积的增加，进一步的压缩导致运动自由受到限制。这种自旋晶格松弛和剪切粘度随压缩的反常行为在较低温度下更为明显，因为氢键网络在较低温度下更发达。与我们早先涵盖10-90 °C温度的数据一致...
The NMR proton spin–lattice relaxation times T1 and shear viscosities have been measured as functions of pressure in the temperature interval −15–10 °C. At low temperatures the low pressure boundary of the experiments is ice I, whereas ice V represents the high pressure extreme of our measurements. The initial compression at all temperatures covered in our study results in higher motional freedom of water molecules so that the pressure dependence exhibits a minimum in viscosity and a maximum in T1. This is a consequence of significant distortion of the hydrogen bond network due to compression which also seems to weaken the hydrogen bonds. Further compression leads to restricted motional freedom due to increased packing of the molecules. This anomalous behavior of spin–lattice relaxation and shear viscosity with compression is more pronounced at lower temperatures since the hydrogen bond network is better developed at lower temperatures. In agreement with our earlier data covering the 10–90 °C temperature ...