承压过冷水中的动态交叉现象及其与水中液-液临界点存在的关系

IF 0.5 Q4 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

Complex Systems Pub Date : 2008-02-27 DOI:10.1063/1.2897826

Sow-Hsin Chen, F. Mallamace, Li Liu, Dazhi Liu, Xiang-Qiang Chu, Yang Zhang, Chansoo Kim, A. Faraone, C. Mou, E. Fratini, P. Baglioni, A. Kolesnikov, V. García-Sakai

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引用次数: 20

摘要

在受限过冷水中，我们观察到α -弛豫时间和自扩散常数的脆性-强动态交叉(FSC)现象。用准弹性中子散射(QENS)实验测量了α -弛豫时间，用核磁共振(NMR)实验测量了自扩散常数。水被限制在纳米级二氧化硅材料MCM - 41 - S和双壁碳纳米管(DWNT)的圆柱形孔中，呈一维几何形状。从非相干非弹性中子散射实验中玻色子峰的出现也可以观察到交叉现象。我们观察到在环境压力下的交叉温度及以下明显违反斯托克斯-爱因斯坦关系。当对承压水施加压力时，交叉温度显示出密切跟踪从存在的液-液临界点而产生的智慧线，该临界点处于散装水无法达到的深度过冷状态。讨论了过冷承压水中动态交叉现象与密度极小值存在的关系。最后，我们讨论了水合水的FSC在生物聚合物中控制生物聚合物的生物功能的作用。在受限过冷水中，我们观察到α -弛豫时间和自扩散常数的脆性-强动态交叉(FSC)现象。用准弹性中子散射(QENS)实验测量了α -弛豫时间，用核磁共振(NMR)实验测量了自扩散常数。水被限制在纳米级二氧化硅材料MCM - 41 - S和双壁碳纳米管(DWNT)的圆柱形孔中，呈一维几何形状。从非相干非弹性中子散射实验中玻色子峰的出现也可以观察到交叉现象。我们观察到在环境压力下的交叉温度及以下明显违反斯托克斯-爱因斯坦关系。当对承压水施加压力时，交叉温度显示出密切跟踪从存在的液-液临界点而产生的智慧线，该临界点处于散装水无法达到的深度过冷状态。动态交叉现象与存在的关系

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Dynamic crossover phenomenon in confined supercooled water and its relation to the existence of a liquid-liquid critical point in water

We have observed a Fragile‐to‐Strong Dynamic Crossover (FSC) phenomenon of the α‐relaxation time and self‐diffusion constant in confined supercooled water. The α‐relaxation time is measured by Quasielastic Neutron Scattering (QENS) experiments and the self‐diffusion constant by Nuclear Magnetic Resonance (NMR) experiments. Water is confined in 1‐d geometry in cylindrical pores of nanoscale silica materials, MCM‐41‐S and in Double‐Wall Carbon Nanotubes (DWNT). The crossover phenomenon can also be observed from appearance of a Boson peak in Incoherent Inelastic Neutron Scattering experiments. We observe a pronounced violation of the Stokes‐Einstein Relation at and below the crossover temperature at ambient pressure. Upon applying pressure to the confined water, the crossover temperature is shown to track closely the Widom line emanating from the existence of a liquid‐liquid critical point in an unattainable deeply supercooled state of bulk water. Relation of the dynamic crossover phenomenon to the existence of a density minimum in supercooled confined water is discussed. Finally, we discuss a role of the FSC of the hydration water in a biopolymer that controls the biofunctionality of the biopolymer.We have observed a Fragile‐to‐Strong Dynamic Crossover (FSC) phenomenon of the α‐relaxation time and self‐diffusion constant in confined supercooled water. The α‐relaxation time is measured by Quasielastic Neutron Scattering (QENS) experiments and the self‐diffusion constant by Nuclear Magnetic Resonance (NMR) experiments. Water is confined in 1‐d geometry in cylindrical pores of nanoscale silica materials, MCM‐41‐S and in Double‐Wall Carbon Nanotubes (DWNT). The crossover phenomenon can also be observed from appearance of a Boson peak in Incoherent Inelastic Neutron Scattering experiments. We observe a pronounced violation of the Stokes‐Einstein Relation at and below the crossover temperature at ambient pressure. Upon applying pressure to the confined water, the crossover temperature is shown to track closely the Widom line emanating from the existence of a liquid‐liquid critical point in an unattainable deeply supercooled state of bulk water. Relation of the dynamic crossover phenomenon to the existence...

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来源期刊

Complex Systems MATHEMATICS, INTERDISCIPLINARY APPLICATIONS-

CiteScore

1.80

自引率

25.00%

发文量