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Updated: May 23, 2025

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Published on: October 31, 2019

在旋转交叉框架中可切换的巨大异型热膨胀.

Si-Guo Wu¹, Wen Cui¹, Ze-Yu Ruan¹

¹Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Institute of Green Chemistry and Molecular Engineering, Guangdong Basic Research Center of Excellence for Functional Molecular Engineering, Sun Yat-Sen University Guangzhou 510006 P. R. China nizhp@mail.sysu.edu.cn tongml@mail.sysu.edu.cn.

Chemical science

|April 21, 2025

概括

研究人员开发了一种新型的动态晶体材料,表现出可切换的巨大异型热膨胀 (ATE). 这种材料显示出先进的热力学传感应用的潜力,通过结合振动和电子机制来获得可调节的热性能.

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Last Updated: May 23, 2025

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Published on: October 31, 2019

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科学领域:

材料科学材料科学材料科学
晶体学晶体学是指结晶学.
超分子化学超分子化学

背景情况:

具有可调节的热膨胀的先进材料对于热力学传感和耐热应力至关重要.
霍夫曼型框架为设计功能性材料提供了一个多功能平台.

研究的目的:

在霍夫曼型框架中实现可切换的巨大异构热膨胀 (ATE).
通过结合振动,电子和分子运动策略来研究驱动ATE行为机制.
为了证明动态晶体材料在可调节的热力学性能方面的潜力.

主要方法:

霍夫曼型框架的合成: [Fe(bpy-NH2) {Au(CN) 2}2]·iPrOH.
研究由宿主-客人相互作用驱动的结构变形.
使用振动和电子机制的组合分析热膨胀行为.
旋转交叉 (SCO) 现象的特征及其与热膨胀的相关性.

主要成果:

在Fe·iPrOH框架中实现了可切换的巨大异构热膨胀 (ATE).
在罗姆基网格内,由二次旋转驱动的剪刀般的运动导致了巨大的ATE.
由于旋转过渡,宿主-客人合作以及 iPrOH 客人的分子运动,观察到逆转的 ATE 行为.
记录了高负热膨胀系数 -7.49 × 10^5 M K^-1 与突然的SCO行为一起.

结论:

该研究提出了一种新的策略,用于设计具有可调节的热力学性能的动态晶体材料.
将多个ATE相关元素集成到一个统一的平台中,可以实现可切换和巨大的热膨胀.
这些发现为开发用于热力学传感和压力管理的先进材料提供了新的视角.