Yang Song, Qin Chenxi, Zhang Zhizhi, Zhang Ming, Li Bin, Ma Yanfei, Zhou Feng, Liu Weimin
School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000 Lanzhou, China.
Chem Bio Eng. 2025 Mar 26;2(4):253-259. doi: 10.1021/cbe.4c00177. eCollection 2025 Apr 24.
The rapid and reversible adhesion between solids is of great significance, particularly in fields such as biomedicine, intelligent machines, and bioelectronic sensors. Hydrogels, as soft materials, play a vital role in reversible adhesion. To achieve a wider range of applications, it is essential to enhance the intelligence of hydrogels. However, the preparation of reversible adhesive hydrogels with remote control, reversible adhesion, rapid response, and no residue remains a challenge in the field. Herein, we developed a light-controlled reversible adhesive hydrogel by integrating temperature-controlled reversible adhesion with the photothermal response capabilities of FeO. The hydrogel can adhere/desorb reversibly under temperature control and allows for remote adhesion control using infrared light. Under infrared light irradiation, surface water causes carboxylic acid groups to migrate to the surface, thereby shielding the catechol groups. This results in insufficient adhesive groups at the interface to form interactions with opposing surfaces. Without infrared light irradiation, the adhesive functional groups are exposed, allowing interaction forces to form between the surface with the adhesion groups and the opposing surfaces. This smart hydrogel holds significant potential for future applications in wound dressings, wearable devices, and soft robots.
固体之间快速且可逆的粘附具有重要意义，尤其在生物医学、智能机器和生物电子传感器等领域。水凝胶作为软材料，在可逆粘附中起着至关重要的作用。为了实现更广泛的应用，增强水凝胶的智能性至关重要。然而，制备具有远程控制、可逆粘附、快速响应且无残留的可逆粘性水凝胶在该领域仍然是一项挑战。在此，我们通过将温度控制的可逆粘附与FeO的光热响应能力相结合，开发了一种光控可逆粘性水凝胶。该水凝胶可在温度控制下可逆地粘附/解吸，并允许使用红外光进行远程粘附控制。在红外光照射下，表面水会使羧酸基团迁移到表面，从而屏蔽邻苯二酚基团。这导致界面处的粘附基团不足，无法与相对表面形成相互作用。在没有红外光照射的情况下，粘附功能基团暴露，使得具有粘附基团的表面与相对表面之间能够形成相互作用力。这种智能水凝胶在伤口敷料、可穿戴设备和软机器人等未来应用中具有巨大潜力。
