Multistep Heterogeneous Nucleation in Binary Mixtures of Charged Colloidal Spheres,The Journal of Physical Chemistry Letters

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Multistep Heterogeneous Nucleation in Binary Mixtures of Charged Colloidal Spheres
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-09-14 00:00:00 , DOI: 10.1021/acs.jpclett.7b02096
Jianing Liu _{1,

2} , Tong Shen _{1,

2} , Zhao Hua Yang ₁ , Shu Zhang ₁ , Guang Yu Sun ₁

Affiliation

Nucleation plays a decisive role in determining the crystal structure and size distribution; however, understanding of the fundamentals of nucleation is quite limited. In particular, it is unclear whether a nucleus forms spontaneously from solution via a single- or multiple-step process. Here we show how a binary mixture of charged colloidal spheres nucleates heterogeneously on a flat substrate by means of Bragg microscopy, laser diffraction, and laser microscopy. In contrast with the conventional one-step and two-step nucleation mechanisms, a novel pathway of multistep heterogeneous nucleation under certain experimental conditions is highlighted by four steps: initial homogeneous fluid → prenucleation clusters → preordered prenucleation clusters → intermediate ordered phase → final crystal. It is expected that the obtained results would be helpful in rationalizing the rich phase behavior exhibited by the binary mixture systems and in developing better and broadly applicable nucleation models as well as in designing defect-free single-crystal alloys.

中文翻译：

带电胶体球二元混合物中的多步非均相成核

成核在决定晶体结构和尺寸分布方面起决定性作用。但是，对成核基本原理的理解是非常有限的。特别地，不清楚是通过单步过程还是多步过程从溶液中自发形成核。在这里，我们通过布拉格显微镜，激光衍射和激光显微镜显示带电胶体球的二元混合物如何在平坦基板上异质形核。与常规的一步和两步成核机制相反，在某些实验条件下的多步异质成核的新途径通过四个步骤突出显示：初始均质流体→预成核簇→预序预成核簇→中间有序相→最终晶体。

更新日期：2017-09-14

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