Curvature-dependent metastability of the solid phase and the freezing-melting hysteresis in pores.
Curvature-dependent metastability of the solid phase and the freezing-melting hysteresis in pores.
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DOI：
10.1103/physreve.73.011608
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发表时间：
2006-01
期刊：
影响因子：
--
通讯作者：
O. Petrov;I. Furó
中科院分区：
文献类型：
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作者：
O. Petrov;I. Furó
我们概括和概括的概念的冻结-熔化滞后，这种现象归因于一个自由能之间的亚稳态和稳定状态的孔隙填充材料的障碍。在一个现象学的描述，我们表明，在通常遇到的条件下，这使得凝固点的抑郁症DeltaTf定义的表面积与体积比S/V，而熔点抑郁症DeltaTm，由平均曲率κ的孔表面，与DeltaTm/DeltaTf =2kappa（V/S）。采用~ 1H NMR低温孔隙度测定法，我们实验证明了具有不同Δ Tf，m的几种液体在受控孔玻璃中吸收的Δ Tm和Δ Tf之间的线性相关性。结果比较有利的形态学性质的玻璃由其他技术确定。我们的研究结果提出了一个简单的方法来分析所观察到的相变温度的孔形态。
We recapitulate and generalize the concept of the freezing-melting hysteresis that attributes this phenomenon to a free-energy barrier between metastable and stable states of pore-filling material. In a phenomenological description, we show that under commonly encountered conditions, this renders the freezing-point depression DeltaTf defined by the surface-to-volume ratio S/V, whereas the melting-point depression DeltaTm, by the mean curvature kappa of the pore surface, with DeltaTm/DeltaTf =2kappa(V/S). Employing 1H NMR cryoporometry, we experimentally demonstrate the linear correlation between DeltaTm and DeltaTf for several liquids with different DeltaTf,m imbibed in controlled pore glasses. The results compare favorably to the morphological properties of the glasses determined by other techniques. Our findings suggest a simple method for analyzing the pore morphology from the observed phase transition temperatures.