Anisotropic Molecular Organization at a Liquid/Vapor Interface Promotes Crystal Nucleation with Polymorph Selection,Journal of the American Chemical Society

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Anisotropic Molecular Organization at a Liquid/Vapor Interface Promotes Crystal Nucleation with Polymorph Selection
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2022-06-23 , DOI: 10.1021/jacs.2c02623
Xin Yao ₁ , Qitong Liu ₂ , Bu Wang ₂ , Junguang Yu ₁ , Michael M Aristov ₃ , Chenyang Shi ₄ , Geoff G Z Zhang ₄ , Lian Yu _{1,

3}

Affiliation

The molecules at the surface of a liquid have different organization and dynamics from those in the bulk, potentially altering the rate of crystal nucleation and polymorphic selection, but this effect remains poorly understood. Here we demonstrate that nucleation at the surface of a pure liquid, d-arabitol, is vastly enhanced, by 12 orders of magnitude, and selects a different polymorph. The surface effect intensifies with cooling and can be inhibited by a dilute, surface-active second component. This phenomenon arises from the anisotropic molecular packing at the interface and its similarity to the surface-nucleating polymorph. Our finding is relevant for controlling the crystallization and polymorphism in any system with a significant interface such as nanodroplets and atmospheric water.

中文翻译：

液/气界面的各向异性分子组织通过多晶型选择促进晶体成核

液体表面的分子与本体中的分子具有不同的组织和动力学，可能会改变晶体成核和多晶型选择的速率，但这种影响仍然知之甚少。在这里，我们证明了纯液体d-阿拉伯糖醇表面的成核大大增强了 12 个数量级，并选择了不同的多晶型物。表面效应随着冷却而增强，并且可以通过稀释的、表面活性的第二组分来抑制。这种现象源于界面处的各向异性分子堆积及其与表面成核多晶型物的相似性。我们的发现与控制任何具有显着界面（如纳米液滴和大气水）的系统中的结晶和多晶型有关。

更新日期：2022-06-23

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