作者:Yumi Ishioka、Nami Minakuchi、Minoru Mizuhata、Tatsuo Maruyama
DOI:10.1039/c3sm52363b
日期:——
Supramolecular gelators comprising 1,3,5-benzenetricarboxylic acids and amino acid methyl esters (glycine, L-alanine, L-valine, L-leucine, L-methionine, and L-phenylalanine) for ionic liquids were developed. Ten types of ionic liquids were gelated using the above-mentioned gelators at relatively low concentrations. Field emission-scanning electron microscopy and confocal laser scanning microscopy analyses revealed that these gelators self-assembled into an entangled fibrous structure in ionic liquids, leading to the gelation of the ionic liquids. Comparison studies, involving compounds analogous to the gelators, and Fourier transform infrared spectroscopy measurements suggested that hydrogen bonding played a key role in the self-assembly of the gelator molecules. The ionogels displayed reversible thermal transition characteristics and viscoelastic properties typical of a gel. The gelation of the ionic liquids studied under a wide range of gelator concentrations did not affect the intrinsic conductivity of the ionic liquids.
开发了由 1,3,5-苯三羧酸和氨基酸甲酯(甘氨酸、L-丙氨酸、L-缬氨酸、L-亮氨酸、L-蛋氨酸和 L-苯丙氨酸)组成的离子液体超分子凝胶剂。使用上述凝胶剂以相对较低的浓度凝胶化了十种离子液体。场发射扫描电子显微镜和共聚焦激光扫描显微镜分析表明,这些凝胶剂在离子液体中自组装成缠结的纤维结构,导致离子液体凝胶化。利用与凝胶剂类似的化合物进行的对比研究和傅立叶变换红外光谱测量表明,氢键在凝胶剂分子的自组装过程中发挥了关键作用。离子凝胶显示出可逆的热转变特性和典型的凝胶粘弹特性。在多种凝胶剂浓度下研究离子液体的凝胶化现象,并未影响离子液体的内在电导率。