ACS Appl Mater Interfaces. 2017 Jul 26;9(29):24511-24517. doi: 10.1021/acsami.7b07204. Epub 2017 Jul 14.
Dynamic Softening or Stiffening a Supramolecular Hydrogel by Ultraviolet or Near-Infrared Light
Zhao Zheng, Jingjing Hu, Hui Wang, Junlin Huang, Yihua Yu, Qiang Zhang, Yiyun Cheng
Abstract
The development of light-responsive hydrogels that exhibit switchable size and mechanical properties with temporal and spatial resolution is of great importance in many fields. However, it remains challenging to prepare smart hydrogels that dramatically change their properties in response to both ultraviolet (UV) and near-infrared (NIR) lights. Here, we designed a dual-light responsive supramolecular gel by integrating UV light-switchable host-guest recognition, temperature responsiveness, and NIR photothermal ability in the gel. The gel could rapidly self-heal and is capable of both softening and stiffening controlled by UV and NIR lights, respectively. Besides stiffness modulation, the bending direction of the gel can be controlled by UV or NIR light irradiation. The smart gel makes it possible to generate dynamic materials that respond to both UV and NIR lights and represents a useful tool that might be used to modulate cellular microenvironments with spatiotemporal resolution.
Keywords: host−guest interaction; light responsive; self-healing; smart hydrogel; stiffness.
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