Crystallization Kinetics of Concurrent Liquid-Metastable and Metastable-Stable Transitions, and Ostwald's Step Rule.
Crystallization Kinetics of Concurrent Liquid-Metastable and Metastable-Stable Transitions, and Ostwald's Step Rule.
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DOI：
10.1021/acs.langmuir.5b00917
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Hongwei Zhou;Yanming Qin;Shenghua Xu;Zhiwei Sun
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文献类型：
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作者：
Hongwei Zhou;Yanming Qin;Shenghua Xu;Zhiwei Sun
实验测量了带电粒子在大范围体积分数下的胶体结晶，以研究液体-亚稳定转变过程。为了拟合得到的实验数据，我们建立了一个理论模型来描述液体-亚稳和亚稳同步转变的动力学。我们的观察很好地支持了这个模型。我们发现，当亚稳跃迁速率与液体亚稳速率之比非常大时，亚稳态虽然仍然存在，但可能变得无法检测到，这为奥斯特瓦尔德阶跃规则的极少数例外提供了可能的解释。
Experimental measurements of colloidal crystallization in a wide range of volume fractions of charged particles were performed to investigate the liquid-metastable-stable transition process. To fit the obtained experimental data, we developed a theoretical model to formulate the kinetics of the concurrent liquid-metastable and metastable-stable transitions. This model is well-supported by our observations. We found that when the ratio of the metastable-stable transition rate to the liquid-metastable rate is very large, the metastable state can become undetectable, although it still exists, offering a possible explanation for very few exceptions to Ostwald's step rule.