pH-Tunable Hydrogelators for Water Purification: Structural Optimisation and Evaluation
作者:Daniel M. Wood、Barnaby W. Greenland、Aaron L. Acton、Francisco Rodríguez-Llansola、Claire A. Murray、Christine J. Cardin、Juan F. Miravet、Beatriu Escuder、Ian W. Hamley、Wayne Hayes
DOI:10.1002/chem.201102137
日期:2012.2.27
A focused library of potential hydrogelators each containing two substituted aromatic residues separated by a urea or thiourea linkage have been synthesised and characterized. Six of these novel compounds are highly efficient hydrogelators, forming gels in aqueous solution at low concentrations (0.03–0.60 wt %). Gels were formed through a pH switching methodology, by acidification of a basic solution
已合成和表征了潜在的水凝胶剂的聚焦库,每个均包含两个被尿素或硫脲键隔开的取代的芳族残基。这些新颖的化合物中有六个是高效的水凝剂,可在水溶液中以低浓度(0.03-0.60 wt%)形成凝胶。凝胶是通过pH转换方法,通过添加HCl或将葡萄糖酸δ-内酯缓慢水解来酸化碱性溶液(pH 14至≈4)而形成的。通常,胶凝过程伴随着胶凝剂吸收光谱的急剧变化,导致颜色发生显着变化,通常从鲜橙色变为浅黄色。每种凝胶都能够从水溶液中螯合大量的芳香族阳离子染料亚甲基蓝(最高至1。每克干胶凝剂含02克染料)。其中两种凝胶的低温透射电子显微镜显示了高纵横比纤维的广泛网络。纤维的结构在添加20wt%的染料时发生显着改变,导致聚集并显着缩短了原纤维。这项研究证明了这些新型凝胶作为廉价,有效的水净化平台的可行性。