Supersaturation Dependent Separation of Vanillin Polymorphs from Aqueous Solution in the Presence of Ni‐Foam as Template,Crystal Research and Technology

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Supersaturation Dependent Separation of Vanillin Polymorphs from Aqueous Solution in the Presence of Ni‐Foam as Template
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2020-05-13 , DOI: 10.1002/crat.202000020
Supriya Sundareswaran ₁ , Srinivasan Karuppannan ₁

Affiliation

A unique approach of employing heterogeneous templates for the polymorphic nucleation of vanillin is investigated for the first time using swift cooling crystallization process. The template surface with respect to the intense of supersaturation imparts great difference on the nucleation and morphology of vanillin polymorphs. Thus using Ni‐foam as a novel metal template, both the stable and metastable polymorphs of vanillin are isolated via template‐induced heterogeneous nucleation. The introduction of template plays dual role that induces the nucleation of rare metastable polymorph of vanillin and controls the liquid–liquid phase separation. Moreover, the internal structures and thermal behaviors of the obtained polymorphs are carefully characterized using powder X‐ray diffraction, single crystal X‐ray diffraction, and differential scanning calorimetry analyses, respectively. As a result, the template‐induced heterogeneous nucleation is observed to be a favorable technique for the separation of polymorphic forms of vanillin.

中文翻译：

以镍泡沫为模板的水溶液中香兰素多晶型的过饱和依赖性分离

首次使用快速冷却结晶工艺研究了采用异质模板进行香兰素多晶形核形成的独特方法。模板表面相对于过饱和强度在香兰素多晶型物的形核和形貌上具有很大的差异。因此，使用镍泡沫作为新型金属模板，可通过模板诱导的异质成核分离出香兰素的稳定和亚稳态多晶型物。模板的引入具有双重作用，可诱导香兰素稀有的亚稳态多晶型物成核，并控制液相分离。此外，使用粉末X射线衍射，单晶X射线衍射对获得的多晶型物的内部结构和热行为进行了仔细表征，和差示扫描量热分析。结果，观察到模板诱导的异质成核是分离香兰素多晶型形式的一项有利技术。

更新日期：2020-07-09

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