Zhao Yurong, Chen Xiao, Wang Xudong
Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, People's Republic of China.
J Phys Chem B. 2009 Feb 19;113(7):2024-30. doi: 10.1021/jp810613c.
The aggregation behavior of a surfactant-like ionic liquid, 1-hexadecyl-3-methylimidazolium chloride (C(16)mimCl), in a room temperature ionic liquid ethylammonium nitrate (EAN) has been investigated. With increasing C(16)mimCl concentration, a series of ordered aggregates including micelles, normal hexagonal (H(1)), lamellar (L(alpha)), and reverse bicontinuous cubic (V(2)) liquid crystalline (LC) phases can be detected over a large temperature range by using polarized optical microscopy (POM) and small-angle X-ray scattering (SAXS) techniques. When comparing such a phase behavior with that of the C(16)mimCl/H(2)O binary system, an additional V(2) phase is identified and could be attributed to the different affinities of C(16)mimCl to EAN and water. Higher temperatures induce smaller lattice spacing for the LC phases, which may be due to the softening of the solvophobic chains of C(16)mimCl molecules. Both the imidazolium ring structure and alkyl chain of C(16)mimCl molecule are proved to play important roles for the LC phase formation. Dissipative particle dynamic simulations are also carried out at room temperature, and the obtained intuitive three-dimensional (3D) models can help us better understand the self-assembled structures, which are considered to be supplements for the experimental results.
研究了一种类表面活性剂离子液体1-十六烷基-3-甲基咪唑氯盐（C(16)mimCl）在室温离子液体硝酸乙铵（EAN）中的聚集行为。随着C(16)mimCl浓度的增加，通过偏光显微镜（POM）和小角X射线散射（SAXS）技术，在较大温度范围内可检测到一系列有序聚集体，包括胶束、正六边形（H(1)）、层状（L(α)）和反相双连续立方（V(2)）液晶（LC）相。将这种相行为与C(16)mimCl/H₂O二元体系的相行为进行比较时，发现了一个额外的V(2)相，这可能归因于C(16)mimCl对EAN和水的不同亲和力。较高温度会导致LC相的晶格间距变小，这可能是由于C(16)mimCl分子的疏溶剂链变软所致。已证明C(16)mimCl分子的咪唑环结构和烷基链在LC相形成中都起着重要作用。还在室温下进行了耗散粒子动力学模拟，得到的直观三维（3D）模型有助于我们更好地理解自组装结构，这些模型被认为是对实验结果的补充。
