A hydro-metallogel of an amphiphilic l-histidine with ferric ions: shear-triggered self-healing and shrinkage. Issue 12 (20th October 2016)

• Record Type: Journal Article
• Authors: Chen, Jie; Wang, Tianyu; Liu, Minghua
• Is Part Of: Inorganic chemistry frontiers. Volume 3:Issue 12(2016)
• Page Start: 1559
• Page End: 1565
• Publication Date: 2016-10-20
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6qi00238b
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : An amphiphilicl -histidine derivative was found to form a hydro-metallogel showing dual shrinkage and self-healing properties. Abstract : Metallogels of an amphiphilicl -histidine derivative (LHC18) with various transition metal ions were investigated. It was found that while the amphiphile formed precipitates in aqueous solution when mixed with Cu 2+, Zn 2+, Ni 2+, it formed a hydrogel with Fe 3+ . Interestingly, upon cooling the transparent solution of LHC18 with Fe 3+ to room temperature gently without any interruption, the gel was formed. Upon further resting at room temperature, the gel underwent shrinkage and 90% of ferric water was expelled from the gel. On the other hand, if the as-formed gel was shaken or shear forces were applied, the gel would collapse into sol. The collapsed sol will recover to become the gel within one minute upon resting and the process can be repeated many times. In addition, once the gel experiences the thixotropic process, it will not shrink anymore. So far, various metallogels have been reported, and we show the first example of a metallogel that shows dual shrinkage and self-healing properties.