Diversity Observed in the Nanostructure of Protic Ionic Liquids
Diversity Observed in the Nanostructure of Protic Ionic Liquids
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DOI：
10.1021/jp103863z
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发表时间：
2010-08-12
影响因子：
3.3
通讯作者：
Drummond, Calum J.
中科院分区：
文献类型：
--
作者：
Greaves, Tamar L.;Kennedy, Danielle F.;Drummond, Calum J.
使用小角度和广角 X 射线散射（SAXS 和 WAXS）研究了一系列 20 种质子离子液体 (PIL) 的纳米结构。 PIL 含有与有机或无机阴离子结合的烷基铵、二烷基铵、三烷基铵和环铵阳离子。还探索了阳离子烷基链上羟基和甲氧基取代基的存在。许多 PIL 显示出由离子液体的极性和非极性组分分离产生的纳米结构。发现较长的烷基链会增强这种分离，长度尺度相应增加，而烷基链上羟基的存在导致更多 较少有序的液体。研究的广泛质子离子液体允许建立多种结构性质关系。研究表明，疏溶剂效应取决于 PIL 的纳米结构。这些 PIL 支持两亲物自组装，并且表明，结构较少的 PIL 在支持的溶致液晶相的多样性以及这些相的热稳定性范围中具有更多“类似水”的行为
The nanostructure of a series of 20 protic ionic liquids (PILs) has been investigated using small- and wide-angle X-ray scattering (SAXS and WAXS). The PILs contained alkylammonium, dialkylammonium, trialkylammonium, and cyclic ammonium cations combined with organic or inorganic anions. The presence of hydroxyl and methoxy substituents on the alkyl chains of the cations was also explored Many of the PILs showed a nanostructure resulting from segregation of the polar and nonpolar components of the ionic liquid It was found that this segregation was enhanced for longer alkyl chains, with a corresponding increase in the length scale, whereas the presence of hydroxyl groups on the alkyl chains led to much less ordered liquids. The broad range of protic ionic liquids studied allowed several structure property relationships to be established. The solvophobic effect was shown to be dependent on the nanostructure of the PILs. These PILs support amphiphile self-assembly, and it was shown that the less structured PILs had more "water-like" behavior in the diversity of lyotropic liquid-crystal phases supported, and the thermal stability ranges for these phases