Wang Zhe, Ito Kanae, Leão Juscelino B, Harriger Leland, Liu Yun, Chen Sow-Hsin
†Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
‡NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.
J Phys Chem Lett. 2015 Jun 4;6(11):2009-14. doi: 10.1021/acs.jpclett.5b00827. Epub 2015 May 18.
Using neutron diffraction technique, we measure the average density of the heavy water confined in a nanoporous silica matrix, MCM-41, over the pressure-temperature plane. The result suggests the existence of a line of liquid-liquid phase transition with its end point at 1.29 ± 0.34 kbar and 213 ± 3 K in a fully hydrated sample. This point would be the liquid-liquid critical point (LLCP) according to the "liquid-liquid critical point" scenario. The phase diagram of the deeply cooled confined heavy water is then discussed. Moreover, in a partially hydrated sample, the phase transition completely disappears. This result shows that it is the free water part, rather than the bound water part, of the confined water that undergoes a liquid-liquid transition.
利用中子衍射技术，我们在压力-温度平面上测量了限制在纳米多孔二氧化硅基质MCM-41中的重水的平均密度。结果表明，在完全水合的样品中存在一条液-液相转变线，其终点在1.29±0.34千巴和213±3开尔文处。根据“液-液临界点”的设想，这一点将是液-液临界点（LLCP）。然后讨论了深度冷却的受限重水的相图。此外，在部分水合的样品中，相变完全消失。该结果表明，发生液-液转变的是受限水的自由水部分，而非结合水部分。
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