基于伊米达的离子液体水溶液的异常粘度取决于温度
Devansh Kaushik1, Prashant Hitaishi1, Ashwani Kumar2
1Department of Physics, School of Natural Sciences, Shiv Nadar Institution of Eminence, NH 91, Tehsil Dadri, Uttar Pradesh-201314, India. kamil.syed@snu.edu.in.
Soft matter
|June 9, 2023
概括
两种基于伊米达的离子液体 (IL) 的水溶液显示出异常的粘度变化与温度. 这种异常行为与它们的菌根聚合物和被困离子的结构动态有关.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 体科学 体科学 体科学
背景情况:
- 离子液体 (ILs) 是具有低点的有机盐,具有潜在的工业应用.
- 了解溶液中ILs的热物理性质对于其实际使用至关重要.
- 基于伊米达的ILs的水溶液可以形成复杂的结构,如状网络.
研究的目的:
- 为了研究特定的基于伊米达的ILs在水溶液中粘度的异常温度依赖性.
- 阐明影响粘度的结构变化和菌根动力学.
- 为了将粘度变化与离子导电性和状结构相关联.
主要方法:
- 在温度范围内的[OMIM Cl]和[DMIM Cl]溶液的粘度和离子导电性的实验测量.
- 小角度X射线散射 (SAXS) 用于分析状结构和晶格参数.
- 分子动力学模拟以探测微粒细化和结构随温度松动.
主要成果:
- [OMIM Cl]和[DMIM Cl]溶液的粘度呈现出异常增加,随后随着温度升高而下降.
- 萨克斯数据显示,在研究的温度范围内,细胞形态和晶格参数稳定.
- 分子动力学模拟显示,加热后初始的微粒细化,然后在更高的温度下结构松动.
- 离子导电性与观察到的粘度趋势有相反的关系.
结论:
- 这些IL溶液中的异常粘度行为归因于细胞网络结构和被困离子之间的相互作用.
- 微粒聚合物的温度诱导的结构变化显著影响溶液的宏观性质.
- 这些发现提供了关于离子液溶液复杂流体行为的见解.
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