title: Ionogels of Sugar Surfactant in Ethylammonium Nitrate: Phase Transition from Closely Packed Bilayers to Right-Handed Twisted Ribbons.
abstract: 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.
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, P. R. China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education , Jinan 250100, P. R. China.
authors.forename: Jingcheng
authors.initials: J
authors.lastname: Hao
mesh_terms: D002152:Calorimetry, Differential Scanning; D002241:Carbohydrates / Q000737:chemistry*; D005782:Gels; D046529:Microscopy, Electron, Transmission; D012212:Rheology; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D005782:Gels; D013501:Surface-Active Agents