4.7 Article

Photoresponsive Single-Ion Nanocomposite Hydrogels: Competition of Host-Guest Interactions

Journal

MACROMOLECULES
Volume 55, Issue 19, Pages 8940-8949

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.2c01306

Keywords

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Funding

  1. Center for Emergent Functional Matter Science of National Yang Ming Chiao Tung University from the Featured Areas Research Center Program
  2. Ministry of Science and Technology of the Republic of China

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In this study, versatile and on-demand photocontrollable ionic conductive nanocomposite hydrogels were successfully synthesized via host-guest chemistry. The hydrogels showed higher conductivity under visible light irradiation and lower conductivity under UV irradiation, which could be further manipulated by adjusting the surface-area-to-volume ratio of the nanopores and the alkyl chain length of the anions.
Exploring stimuli-responsive ionic-conductive materials is a challenging task and has gained considerable attention owing to their noninvasive manipulation and applications. Here, we demonstrate versatile and on-demand photocontrollable ionic conductive nanocomposite hydrogels via host-guest chemistry. Supramolecular hydrogels containing fi-cyclodextrin (fi-CD) and ionic liquid monomers are synthesized in the nanopores of anodic aluminum oxide (AAO) templates, on which light-responsive azobenzene polymers are tethered. Under visible light irradiation, the fi-CD molecules preferentially form inclusion complexes with the trans-Azo moieties, resulting in higher concentrations of the mobile anions and lower resistances of the hydrogels; under UV irradiation, rather than the cis-Azo moieties, the fi-CD molecules favor assembly with the anions, which leads to lower concentrations of the mobile anions and higher resistances of the hydrogels. By tuning the surface-area-to-volume ratio of the AAO nanopores and the alkyl chain length of the anions, the response amplitudes can be further manipulated.

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