Frustration of crystallisation by a liquid-crystal phase.
Frustration of crystallisation by a liquid-crystal phase.
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DOI：
10.1038/srep42439
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发表时间：
2017-02-17
影响因子：
4.6
通讯作者：
Wynne K
中科院分区：
文献类型：
--
作者：
Syme CD;Mosses J;González-Jiménez M;Shebanova O;Walton F;Wynne K
局部有利结构的结晶挫折对于连接过冷、玻璃形成和液-液转变现象至关重要。在这里，我们证明了假定的正丁醇液-液转变实际上是由与各向同性波纹层状液晶转变相关的几何挫折引起的。液晶相通常被认为是介于液态和晶态之间。相反，发现过冷正丁醇中的液晶相抑制了向晶体的转变。观察到的挫折相是其他液体中类似有序的模板，可能在许多其他分子液体的过冷和液-液转变中起重要作用。
Frustration of crystallisation by locally favoured structures is critically important in linking the phenomena of supercooling, glass formation, and liquid-liquid transitions. Here we show that the putative liquid-liquid transition in n-butanol is in fact caused by geometric frustration associated with an isotropic to rippled lamellar liquid-crystal transition. Liquid-crystal phases are generally regarded as being “in between” the liquid and the crystalline state. In contrast, the liquid-crystal phase in supercooled n-butanol is found to inhibit transformation to the crystal. The observed frustrated phase is a template for similar ordering in other liquids and likely to play an important role in supercooling and liquid-liquid transitions in many other molecular liquids.