粘度脱是否可以保证动态异质性? 通过激发和发射波长依赖的时间解析光无otropy研究的线索
Ejaj Tarif1, Nilimesh Das1, Pratik Sen1
1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, Uttar Pradesh, India.
The journal of physical chemistry. B
|August 7, 2023
概括
偏离斯托克斯-爱因斯坦-德拜关系表明动态异质性. 本研究介绍了一种使用波长依赖测量的方法,以区分真实动态异质性和同质系统中的偏差.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 频谱学是一种光谱学.
背景情况:
- 斯托克斯-爱因斯坦-德比 (SED) 关系将粘度与介质动态联系起来.
- 从SED关系的偏差 (p ≠ 1) 传统上与动态异质性有关.
- 然而,偏差也可能来自于SED模型本身的假设,使解释复杂化.
研究的目的:
- 开发一种强大的方法来识别动态异质性.
- 区分真正的动态异质性与同质系统中的脱效应.
- 为了在粘度脱和动态异质性之间建立更强的相关性.
主要方法:
- 利用在异质介质中与微域不同交互的solvatochromic探针.
- 采用激发或辐射波长依赖的测量方法来光选择特定的微域 (子群).
- 分析了粘度解参数 (p值) 作为激发/发射波长的函数.
主要成果:
- 粘性分子液体斯奎兰显示分数粘度依赖 (p ≠ 1),但被发现是均的.
- 1-乙烯-3-甲基利米达乙烯硫酸盐离子液 (IL) 呈现轻微的动态异质性.
- [0.78 乙胺 + 0.22 LiNO3] 深度性溶剂 (DES) 显示出显著的动态异质性.
- 同质系统在不同的波长上显示出一致的p值,与异质系统不同.
结论:
- 粘度解参数 (p值) 的波长依赖分析是检测动态异质性的优质方法.
- 这种方法成功地区分了同质和异质介质,即使两者都表现出粘度脱.
- 该研究提供了一个精细的工具来描述复杂的流体动力学和材料特性.
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