D'Anna Francesca, Rizzo Carla, Vitale Paola, Lazzara Giuseppe, Noto Renato
Dipartimento STEBICEF, Sezione di Chimica, Università degli Studi di Palermo, Viale delle Scienze-Parco d'Orleans II, 90128 Palermo, Italy.
Soft Matter. 2014 Dec 14;10(46):9281-92. doi: 10.1039/c4sm01360c.
Diimidazolium and dipyrrolidinium organic salts were tested for their ability to gel both organic solvents and ionic liquids. Organic salts containing 1-(1-imidazolylmethyl)-3,5-di-(3'-octylimidazolylmethyl)-benzene and 1-(N-pyrrolidylmethyl)-3,5-di-(N,N-octylpyrrolidylmethyl)-benzene cations were used. In addition to the simple bromide anion, also dianions having a naphthalene core such as 1,5- and 2,6-naphthalenedisulfonate and 2,6-naphthalenedicarboxylate were taken into account. Gelation tests demonstrated that organic salts used were able to harden ionic liquids. The materials obtained were investigated for their thermal stability and also for electric conductivity properties using micro-DSC and dielectric spectroscopy. Furthermore, the opacity of some gel phases was monitored using UV-vis measurements. To obtain information about the gelation mechanism, gel phase formation was studied as a function of time by means of resonance light scattering investigation. Finally, the ability of materials to respond to external stimuli such as magnetic stirring or ultrasound irradiation was also analyzed. Data collected show that different relationships exist among the gelator and the ionic liquid structure, determining the properties of materials and their possible applications.
测试了二咪唑鎓盐和二吡咯烷鎓有机盐使有机溶剂和离子液体凝胶化的能力。使用了含有1-(1-咪唑基甲基)-3,5-二-(3'-辛基咪唑基甲基)-苯和1-(N-吡咯烷基甲基)-3,5-二-(N,N-辛基吡咯烷基甲基)-苯阳离子的有机盐。除了简单的溴化物阴离子外，还考虑了具有萘核的二阴离子，如1,5-和2,6-萘二磺酸盐以及2,6-萘二甲酸盐。凝胶化测试表明，所使用的有机盐能够使离子液体硬化。使用微量差示扫描量热法和介电谱对所得材料的热稳定性和电导率特性进行了研究。此外，使用紫外-可见光谱测量监测了一些凝胶相的不透明度。为了获得有关凝胶化机理的信息，通过共振光散射研究，将凝胶相形成作为时间的函数进行了研究。最后，还分析了材料对外部刺激（如磁力搅拌或超声辐射）的响应能力。收集的数据表明，凝胶剂与离子液体结构之间存在不同的关系，这决定了材料的性能及其可能的应用。
