基于伊米达的甲基化离子液体对粘度的影响:来自补偿阿雷尼乌斯形式主义的新见解
Allison M Fleshman1,2, Allison M Goldman1, Wesley J Hetcher1
1Department of Chemistry, Lawrence University, Appleton, Wisconsin 54911, United States.
意达离子液体的甲基化对粘度的影响不同,取决于离子. 补偿的阿雷尼乌斯形式主义揭示了[Tf2N]-和[B(CN) 4]-离子的不同的激活能量和 entropies.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 室温离子液体 (RTILs) 是具有低点的盐,在各种领域找到应用.
- RTIL的粘度是一个影响其性能的关键性质.
- 在意达酸的C(2) 碳上进行甲基化,可以改变RTIL的特性.
研究的目的:
- 调查C(2) 甲基化对以二三甲基硫胺为基础的RTILs与二 ([Tf2N]-) 和二 ([B(CN) 4]) 离子的粘度的对比作用.
- 用补偿阿雷尼乌斯形式主义 (CAF) 阐明控制这些粘度变化的基本机制.
主要方法:
- 使用补偿的阿雷尼乌斯形式主义 (CAF) 来分析流动性 (逆粘度) 作为热激活的过程.
- 确定四种不同的离子液体系统的CAF激活能量和值:伊米达-[Tf2N]-,甲基化伊米达-[Tf2N]-,伊米达-[B(CN) 4-,和甲基化伊米达-[B(CN) 4-.
主要成果:
- 甲基化增加粘度和CAF激活能量,用于伊米达-[Tf2N]-系统.
- 甲基化降低了度和CAF激活能量,用于伊米达-[B(CN) 4]-系统.
- 激活的分析为两种离子系统之间的差异提供了进一步的见解.
结论:
- 二甲基化对RTIL粘度的影响强烈依赖于离子的性质.
- 补偿的阿雷尼乌斯形式主义有效地解释了观察到的粘度趋势,并提供了与流动性相关的热力学参数.
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