分子架构对比斯酸盐) 离子液体中的散装纳米结构的影响
Oliver S Hammond1,2, Guillaume Bousrez1,2, Filip Mehler3
1Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, SE-114 18, Sweden.
Small (Weinheim an der Bergstrasse, Germany)
|July 3, 2023
概括
具有特定结构的离子液体自组装成纳米结构阶段. 分子设计是形成这些正交离子离子液体中稳定的双连续域的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 超分子化学 超分子化学
背景情况:
- 离子液体 (ILs) 是可调节的溶剂,在各种领域都有潜在的应用.
- 了解ILs的自我组装行为对于设计具有特定性质的材料至关重要.
- орто酸离子为IL设计提供了独特的特性.
研究的目的:
- 为了合成和表征一系列的离子液体与和伊米达离子和正酸盐离子.
- 通过小角度中子散射 (SANS) 研究这些IL的纳米结构和自我组装行为.
- 确定影响ILs复杂相形成的分子因素.
主要方法:
- 合成了19种具有不同基链长度的离子液体和正氧酸盐离子 (bis(oxalato) 酸盐[BOB]−,bis(mandelato) 酸盐[BMB]−,bis(salicylato) 酸盐[BScB]−).
- 微角中子散射 (SANS) 测量以探测纳米结构.
- 使用Teubner和Strey和Ornstein-Zernicke模型对散射数据的分析.
主要成果:
- 所有研究的IL都表现出纳米结构.
- 1-甲基-3-n-基伊米达-甲基酸盐形成了连续的L3海绵状相,基链的长度超过C6.
- 阶段形成对阴离子结构 (例如甲基化,链长度) 和离子类型敏感,系统显示的复杂阶段形成有限.
- 像素系统中的结能力提高了自组装的多功能性.
结论:
- 有一个狭窄的分子两性和阴离子:阴离子体积匹配的窗口存在于形成稳定的双连续域在正交 ILs.
- 阴离子设计,特别是在伊米达系统中存在的H键网络,显著影响了自我组装.
- 诸如甲基化或用离子替代伊米达等修改会破坏复杂相位的形成.
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