系列小分子液体中α弛豫与探针离子电导行为的对比  

Comparative investigations onαrelaxation and conductivity of probe ions in a series of small molecular liquids

作　　者：赵兴宇 王丽娜 韩宏博 尚洁莹 Zhao Xing-Yu;Wang Li-Na;Han Hong-Bo;Shang Jie-Ying(Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters,College of Physical Science and Technology,Yili Normal University,Yining 835000,China)

机构地区：[1]伊犁师范大学物理科学与技术学院,新疆凝聚态相变与微结构实验室,伊宁835000

出　　处：《物理学报》2024年第14期239-245,共7页Acta Physica Sinica

基　　金：新疆维吾尔自治区自然科学基金(批准号:2021D01C464,2021D01C465);伊犁师范大学提升学科综合实力专项(批准号:22XKZY27)资助的课题.

摘　　要：液体中平动和转动的耦合性是凝聚态物理长期关注的问题之一,本文采用介电谱方法同时获得了系列小分子液体中α弛豫的弛豫时间和探针离子的电导率.样品包括具有不同分子形状和官能团的碳原子数跨度在3—14范围内的15种一元和二元小分子液体.分析结果表明平动和转动的耦合性与液体分子的官能团并没有直接的对应关系,对分子形状、大小和离子大小也不是十分敏感,但是液体的微观结构是影响平动和转动耦合性的重要因素.也就是,无论在一元还是二元体系中,液体的微观结构没有改变时电导率的倒数和弛豫时间与温度的依赖关系具有一致性,这也为弛豫时间的测量提供了一种方法.研究结果还表明,液体中自身携带的杂质离子与定量掺入离子的电导率的温度依赖关系相同,为电解质溶解度低的有机小分子液体中离子电导率行为的研究提供了思路.本文中单羟基醇的实验结果也与单羟基醇中α弛豫而非Debye弛豫对应于体系结构弛豫的观点相一致.The coupling between translational motion and rotational motion in liquids is one of the long-standing concerns in condensed matter physics.The relaxation times ofαrelaxation and probe ion conductivities in a series of small molecular liquids,15 types of single and binary small molecular liquids with different molecular shapes and functional groups when the number of carbon atoms is in a range from 3 to 14,are simultaneously obtained by dielectric spectroscopy method in this work.The results indicate that the coupling between translation and rotation is not directly related to the functional group of liquid molecules,nor very sensitive to the shape nor the size of molecules or ion size.However,the microstructure of liquid is a key factor affecting the coupling between translation and rotation.In other words,when the microstructure of the liquid is unchanged,the dependence of relaxation time on temperature is consistent with the dependence of conductivity reciprocal on temperature,whether in single small molecular liquids or in binary small molecular liquids,which provides a method for measuring relaxation time.The research results also show that the temperature dependence of the conductivity of the impurity ions carried by the liquid itself is consistent with the one of quantitatively doped ions,providing the ideas for investigating the ion conductivity behavior in organic small molecular liquids with low electrolyte solubilities.The experimental results of monohydroxy alcohol are consistent with the viewpoint thatαrelaxation rather than Debye relaxation corresponds to the system structure relaxation.

关 键 词：平动和转动耦合 弛豫时间 离子电导率 小分子液体 

分 类 号：O469[理学—凝聚态物理]