Transition Mechanism from Nonlamellar to Well-Ordered Lamellar Phases: Is the Lamellar Liquid-Crystal Phase a Must?,The Journal of Physical Chemistry Letters

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Transition Mechanism from Nonlamellar to Well-Ordered Lamellar Phases: Is the Lamellar Liquid-Crystal Phase a Must?
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-05-06 , DOI: 10.1021/acs.jpclett.1c01146
Bobo Cao ₁ , Hao-Yue Guo ₁ , Xiao-Lei Hao ₁ , Zhong-Hua Wu ₂ , Fu-Gen Wu ₃ , Zhi-Wu Yu ₁

Affiliation

Understanding the self-assembly mechanisms of amphiphilic molecules in solutions and regulating their phase behaviors are of primary significance for their applications. To challenge the reported direct phase transitions from nonlamellar to ordered lamellar phases, the self-assembly and phase behavior of the 1-hexadecyl-3-methylimidazolium chloride aqueous dispersions were studied using a strategy of isothermal incubation after the temperature jump. A disordered lamellar phase (identified as the lamellar liquid-crystal (L_α) phase), serving as an intermediate, was found to bridge the transition from a spherical micellar (M) phase to a lamellar-gel (L_β) phase. Meanwhile, the nonsynchronicity in the tail and headgroup regions of the ionic liquid surfactant during the transition process was also unveiled, with the former being prior to the latter. The in-depth understanding of the self-assembly mechanisms may help push forward the related applications in the future.

中文翻译：

从非层状相向规则层状相的转变机理：层状液晶相是否必须？

了解溶液中两亲分子的自组装机制并调节其相行为对它们的应用具有重要意义。为了挑战报道的从非层状相到有序层状相的直接相变，使用了温度跃迁后的等温孵育策略研究了1-十六烷基-3-甲基咪唑鎓氯化物水分散体的自组装和相行为。无序层状相（标识为层状液晶（L _α）相），作为中间，被发现以桥接从球形胶束（M）相到层状凝胶转变（L _β）阶段。同时，还揭示了过渡过程中离子液体表面活性剂的尾部和头基区域的不同步性，前者先于后者。对自组装机制的深入了解可能有助于将来推动相关的应用程序。

更新日期：2021-05-20

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