Wang Xiaolin, Hao Jingcheng
Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, P. R. China.
J Phys Chem B. 2015 Oct 22;119(42):13321-9. doi: 10.1021/acs.jpcb.5b07712. Epub 2015 Oct 8.
In the simplest ionic liquid, ethylammonium nitrate (EAN), ionogels with high mechanical strength were prepared from a surfactant with a disaccharide polar head. Phase structures from closely packed bilayers to right-handed twisted ribbons were determined via freeze-fracture transmission electron microscopy (FF-TEM) observations. The phase transition mechanism was investigated deeply and systematically. The temperature contributes to suitable tail chain conformations of surfactant molecules for adapting to different self-assembled structures including right-handed twisted ribbons and bilayers. Two different arrays were revealed for different bilayers by the small-angle X-ray scattering (SAXS) measurements. The rheological and tribological properties of the ionogels were investigated. The better lubricating property and antiwear capability of the ionogels compared to the EAN may be attributed to the structure characteristics and the good thixotropic properties.
在最简单的离子液体硝酸乙铵（EAN）中，由具有二糖极性头的表面活性剂制备出了具有高机械强度的离子凝胶。通过冷冻断裂透射电子显微镜（FF-TEM）观察确定了从紧密堆积的双层到右手扭曲带的相结构。对相变机制进行了深入系统的研究。温度有助于表面活性剂分子形成合适的尾链构象，以适应包括右手扭曲带和双层在内的不同自组装结构。通过小角X射线散射（SAXS）测量揭示了不同双层的两种不同排列。研究了离子凝胶的流变学和摩擦学性能。与EAN相比，离子凝胶具有更好的润滑性能和抗磨损能力，这可能归因于其结构特征和良好的触变性。
