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Robust Multi-Responsive Supramolecular Hydrogel Based on Mono-Component Host-Guest Gelator

Abstract

Supermoleculer hydrogels have been widely investigated, but the construction of stimuli-responsive mono-component host-guest hydrogels remains a challenge in that it is still hard to balance the solubility and gel ability for the gelator. In this work, three azobenzene modified β-cyclodextrins derivatives with different alkyl length (β-CD-Azo-Cn) have been synthesized. The length of alkyl dramatically influences the solubility and gel ability of β-CD derivatives in water. Among these derivatives, β-CD-Azo-C8 possesses the lowest minimum gelation concentration (MGC). Based on host-guest interaction between β-CD and azobenzene units in aqueous solution, which is confirmed by UV-visible and ROESY NMR spectra, the gelators self-assemble and further interwine into networks through the hydrogen bonds on the surface of β-CD cavities. The hydrogel formed by mono-component gelator can collapse under the external stimuli such as heating, competition guest and host, and UV irradiation. When the concentration of gelator is more than 8 wt%, the hydrogels exhibits good self-supporting ability with a storage modulus higher than 10^4 Pa. The gel-sol transition temperature of hydrogel is near body temperature, indicating the potential applications in biological materials.

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Publication details

The article was received on 27 Mar 2018, accepted on 11 May 2018 and first published on 11 May 2018


Article type: Paper
DOI: 10.1039/C8SM00639C
Citation: Soft Matter, 2018, Accepted Manuscript
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    Robust Multi-Responsive Supramolecular Hydrogel Based on Mono-Component Host-Guest Gelator

    W. Cheng, D. Zhao, Y. Qiu, H. Hu, H. Wang, Q. Wang, Y. Liao, H. Peng and X. Xie, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00639C

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