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DOI	10.1073/pnas.2020878118
	Evidence of a liquid-liquid transition in a glass-forming ionic liquid
	Harris M.A.; Kinsey T.; Wagle D.V.; Baker G.A.; Sangoro J.
发表日期	2021
ISSN	00278424
卷号	118 期号:11
英文摘要	A liquid-liquid transition (LLT) is a transformation from one liquid to another through a first-order transition. The LLT is fundamental to the understanding of the liquid state and has been reported in a few materials such as silicon, phosphorus, triphenyl phosphite, and water. Furthermore, it has been suggested that the unique properties of materials such as water, which is critical for life on the planet, are linked to the existence of the LLT. However, the experimental evidence for the existence of an LLT in many molecular liquids remains controversial, due to the prevalence and high propensity of the materials to crystallize. Here, we show evidence of an LLT in a glass-forming trihexyltetradecylphosphonium borohydride ionic liquid that shows no tendency to crystallize under normal laboratory conditions. We observe a step-like increase in the static dielectric permittivity at the transition. Furthermore, the sizes of nonpolar local domains and ion-coordination numbers deduced from wide-angle X-ray scattering also change abruptly at the LLT. We independently corroborate these changes in local organization using Raman spectroscopy. The experimental access to the evolution of local order and structural dynamics across a liquid-liquid transition opens up unprecedented possibilities to understand the nature of the liquid state. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Glass transition; Ionic liquids; Liquid-liquid transition; Mesoscale organization
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180261
作者单位	Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, United States; Department of Chemistry and Physics, Florida Gulf Coast University, Fort Myers, FL 33965, United States; Department of Chemistry, University of Missouri, Columbia, MO 65211, United States
推荐引用方式 GB/T 7714	Harris M.A.,Kinsey T.,Wagle D.V.,et al. Evidence of a liquid-liquid transition in a glass-forming ionic liquid[J],2021,118(11).
APA	Harris M.A.,Kinsey T.,Wagle D.V.,Baker G.A.,&Sangoro J..(2021).Evidence of a liquid-liquid transition in a glass-forming ionic liquid.Proceedings of the National Academy of Sciences of the United States of America,118(11).
MLA	Harris M.A.,et al."Evidence of a liquid-liquid transition in a glass-forming ionic liquid".Proceedings of the National Academy of Sciences of the United States of America 118.11(2021).