溶剂同位素对各向同性色子液晶相变的影响:重水使介质带电量减少

Jiyong Cheon, Joonwoo Jeong
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引用次数: 0

摘要

溶质分子和溶剂分子在各向同性介相中的相互作用影响着它们的物理化学性质,如相行为和粘弹性。在我们的模型体系--由色甘酸二钠(DSCG)制成的各向同性色素液晶(LCLC)中,带电的类木板分子通过在水(H$_{2}$O)中的非共价吸引作用自我组装形成拉长的聚集体。聚集体排列成液晶相:向列相和柱状相。在此,我们报告了当 D$_2$O 取代 H$_2$O 时,同位素对 LCLC 相行为的影响。与 H$_2$O-DSCG 相比,D$_2$O-DSCG 表现出更高的向列相到各向同性相转变温度。X 射线散射显示 D$_2$O-LCLC 的聚集间相关长度要长得多。相比之下,其他微观结构特性,如聚集间距离和聚集内相关长度几乎保持不变。我们的 $^{23}$Na FT-NMR 测量结果表明,与 H$_2$O-DSCG 聚集体相比,D$_2$O-DSCG 聚集体的反离子 Na$^+$ 的电荷含量较低。聚集体之间较弱的静电斥力可能会稳定向列相,这种溶剂同位素效应可能普遍适用于具有静电相互作用的各种水溶液各向同性介相。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Solvent isotopic effect on the phase transition of lyotropic chromonic liquid crystals: Heavy water makes mesogens less charged
The interplay among solute and solvent molecules in lyotropic mesophases governs their physicochemical properties, such as phase behaviors and viscoelasticity. In our model system, a lyotropic chromonic liquid crystal (LCLC) made by disodium cromoglycate (DSCG), charged plank-like molecules self-assemble to form elongated aggregates via non-covalent attractions in water (H$_{2}$O). The aggregates align to exhibit liquid crystalline phases: nematic and columnar phases. Here, we report the isotopic effect on the phase behavior of the LCLC when D$_2$O is substituted for H$_2$O. D$_2$O-DSCG exhibits higher nematic-to-isotropic phase transition temperatures than H$_2$O-DSCG. X-ray scattering reveals considerably longer inter-aggregate correlation lengths in D$_2$O-LCLCs. In contrast, the other microstructural properties, such as inter-aggregate distances and intra-aggregate correlation lengths, remain almost the same. Our $^{23}$Na FT-NMR measurement reveals that D$_2$O-DSCG aggregates are less charged with more counter-ions, Na$^+$, bound to them than H$_2$O-DSCG aggregates. Weaker electrostatic repulsion between aggregates may stabilize the nematic phase, and this solvent isotopic effect may generally apply to diverse aqueous lyotropic mesophases with electrostatic interactions.
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