Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China.
Langmuir. 2010 Jun 1;26(11):7802-7. doi: 10.1021/la9045995.
The aggregation behaviors of oleyl polyoxyethylene (10) ether, Brij 97, in room temperature ionic liquids, ethylammonium nitrate (EAN), pyrrolidinium nitrate ([Pyrr][NO(3)]), ethylammonium butyrate (EAB), 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF(6)]), and 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF(4)]), have been investigated. Only in the Brij 97/EAN binary system is the hexagonal liquid crystalline phase formed, and its ordering is found to decrease with increasing temperature. The lattice spacing values measured from the small-angle X-ray scattering (SAXS) shrink with reduction of ionic liquid content at room temperature. The general rules for aggregate formation in these ionic liquids are discussed and compared with that in water. A degraded ability to produce the ordered self-assembly of Brij 97 from H(2)O to EAN to [Bmim][PF(6)], [Bmim][BF(4)], [Pyrr][NO(3)], and EAB is found and analyzed based on the molecular packing and Gordon parameters and also hydrogen-bonding or solvophobic interactions. Steady-shear rheological measurements combined with the frequency sweep data indicate the highly viscoelastic nature of this liquid crystalline phase.
油醇聚氧乙烯（10）醚、Brij 97 在室温离子液体中的聚集行为，硝酸乙基铵（EAN）、硝酸吡咯烷（[Pyrr][NO(3)]）、丁酸乙酯（EAB）、1-丁基-3-甲基咪唑六氟磷酸盐([Bmim][PF(6)]）和 1-丁基-3-甲基咪唑四氟硼酸盐([Bmim][BF(4)])中已经被研究过。只有在 Brij 97/EAN 二元体系中才形成了六方液晶相，其有序性随着温度的升高而降低。从小角度 X 射线散射（SAXS）测量的晶格间距值在室温下随着离子液体含量的减少而缩小。讨论了在这些离子液体中形成聚集体的一般规律，并与在水中的情况进行了比较。根据分子堆积和 Gordon 参数，以及氢键或溶剂化相互作用，发现并分析了从 H(2)O 到 EAN 到 [Bmim][PF(6)]、[Bmim][BF(4)]、[Pyrr][NO(3)]和 EAB，Brij 97 有序自组装能力的退化。稳态剪切流变学测量结合频率扫描数据表明该液晶相具有高度的粘弹性。
