Mechanically-sensitive hydrogels formed from β-cyclodextrin and an anionic surfactant containing a biphenyl group

Soft Matter
Zhaolan ZhaiZhenggang Cui

Abstract

Hydrogels are important soft materials with intriguing properties. By taking advantage of the host-guest interactions and multiple molecular interactions, it is expected that novel hydrogel systems can be formed. This strategy has been implemented here, transparent hydrogels were formed by using a newly-synthesized anionic surfactant, sodium 2-(4-phenylphenoxy)dodecanoate (C12biphNa), and β-cyclodextrin (β-CD) in different proportions and their properties were investigated. Gelation of water occurs at extremely low surfactant concentrations (5 mM for a 1:3 C12biphNa: β-CD system), and a single C12biphNa with its associated β-CDs can trap about 11,000 water molecules on average. In addition, the systems are fragile to mechanical stimulus and thus show mechanical sensitivity. Cryo-TEM reveals that the hydrogels have a microstructure consisting of rigid nanowire-like aggregates (with cross-sectional diameters of about 7-8 nm) locally distributed in a parallel manner in solution. These microstructural features are responsible for the peculiar properties of the hydrogel systems presented. The inclusion complexes formed by C12biphNa and β-CD were investigated using (1)H NMR and 2D nuclear overhauser effect spectroscopy and their aggr...Continue Reading

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Citations

Jul 25, 2019·Soft Matter·Miriam KhodeirJean-François Gohy
Apr 15, 2016·Macromolecular Rapid Communications·Xiaojin ZhangRenxi Zhuo
Aug 20, 2020·Journal of Agricultural and Food Chemistry·Zhaolan ZhaiJie Song

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