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Issue 10, 2016
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Mechanically-sensitive hydrogels formed from β-cyclodextrin and an anionic surfactant containing a biphenyl group

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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 1H NMR and 2D nuclear overhauser effect spectroscopy and their aggregation state was proposed. This work enriches the connotation of nonamphiphilic self-assembly and provides inspiration for constructing new functional soft materials.

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

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Supplementary files

Article information


Submitted
24 Nov 2015
Accepted
14 Jan 2016
First published
14 Jan 2016

Soft Matter, 2016,12, 2715-2720
Article type
Paper
Author version available

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

Z. Zhai, L. Lei, J. Song, B. Song, X. Pei and Z. Cui, Soft Matter, 2016, 12, 2715
DOI: 10.1039/C5SM02858B

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