Liquid-to-crystal nucleation: A new generation lag-time apparatus
Liquid-to-crystal nucleation: A new generation lag-time apparatus
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DOI：
10.1063/1.1497635
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发表时间：
2002-09-15
影响因子：
4.4
通讯作者：
Haymet, ADJ
中科院分区：
文献类型：
--
作者：
Heneghan, AF;Haymet, ADJ
用新一代自动滞后装置ALTA-4研究了液晶成核的统计特性。描述并实现了两种工作模式。一份200毫升的蒸馏水样品以恒定的速度阿尔法重复冷却，直到样品冻结。这个循环被重复数百次，以产生可靠和可重复的成核统计数据。从单个实验中，在单一的可测近似下，我们提取了表征平均滞后时间的泛函形式，它是低于平衡冻结温度T-f的过冷度DeltaT的函数。这些数据和分析从单个实验中得出了平均滞后时间的分布，作为温度变化的函数，增量T。在冷却速率α的一个数量级以上，从0.6K到7.5K分钟(-1)(0.01-0.125 K S(-1))，得到了相同的结果。(C)2002年美国物理研究所。
The statistics of liquid-to-crystal nucleation are examined using a new generation automated lag-time apparatus denoted ALTA 4. Two modes of operation are described and implemented. A single 200 mul sample of distilled water is cooled repeatedly at a constant rate, alpha, until the sample freezes. This cycle is repeated many hundreds of times, to generate the reliable and reproducible statistics for nucleation. From a single experiment, under a single testable approximation, we extract the functional form which characterizes the average lag-time, , as a function of the degree of supercooling DeltaT below the equilibrium freezing temperature, T-f. These data and the analysis yield, from a single experiment, a profile for the average lag-time, , as a function of change in temperature, DeltaT. Identical results are obtained over more than an order of magnitude of cooling rates alpha, from 0.6 to 7.5 K min(-1) (0.01-0.125 K s(-1)). (C) 2002 American Institute of Physics.