Liquid-to-crystal nucleation: Automated lag-time apparatus to study supercooled liquids
Liquid-to-crystal nucleation: Automated lag-time apparatus to study supercooled liquids
复制标题
DOI：
10.1063/1.1407290
复制
发表时间：
2001-10-22
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;Wilson, PW;Haymet, ADJ
使用自动滞后时间装置研究了液体到晶体成核的统计数据。将单个500 μ L穆尔样品反复过冷至低于其平衡冷冻温度的固定温度，保持直至发生冷冻，然后解冻。然后，我们的原始数据是三组过冷温度中的每一组的大约300个滞后时间。在每种情况下，添加小的不溶性AgI晶体以确保异质成核和Δ T =8 K左右的平均成核温度。滞后时间的分布进行了分析，并示出是很好地近似由一个单一的指数衰减，平均滞后时间在1000-3000秒的范围内。这种平均滞后时间显着减少，在更深层次的过冷，并为目前的数据，这种减少是同样适合指数，幂律衰减，和经典的成核功能的形式。(C)2001年美国物理学会。
The statistics of liquid-to-crystal nucleation are studied using an automated lag-time apparatus. A single 500 muL sample of distilled water is repeatedly supercooled to a fixed temperature below its equilibrium freezing temperature, held until freezing occurred, and then thawed. Our raw data is then a set of approximately 300 lag-times for each of three set supercooling temperatures. In each case, a small insoluble AgI crystal was added to ensure heterogeneous nucleation and average nucleation temperatures around DeltaT=8 K. The distribution of lag-times is analyzed, and shown to be well approximated by a single exponential decay, with average lag-times in the range of 1000-3000 seconds. This average lag-time decreases markedly at deeper levels of supercooling, and for the present data, this decrease is fit equally well by exponential, power law decay, and classical nucleation functional forms. (C) 2001 American Institute of Physics.