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Hydrogel Patch with Biomimetic Tree Frog Micropillars for Enhanced Adhesion and Perspiration Wicking
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2024-04-05 , DOI: 10.1021/acsapm.4c00147 Ruicheng Ruan 1 , Jinwei Li 1 , Ke Xu 1 , Yuanfen Chen 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2024-04-05 , DOI: 10.1021/acsapm.4c00147 Ruicheng Ruan 1 , Jinwei Li 1 , Ke Xu 1 , Yuanfen Chen 1
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Hydrogels with superior adhesion in both wet and dry interfaces, excellent biocompatibility, and electrical conductivity are highly essential for biomedical engineering and wearable electronics. Although a variety of artificial adhesives have been developed to enhance adhesion in a wet interface, a single adhesion strategy has limitations in complex adhesion environments. Inspired by the ortho-hexagonal toe pads of the tree frog, we present a microstructured hydrogel adhesive (MS-HAD) that combines chemical adhesive and perspiration wicking introduced by a biomimetic microstructure. This MS-HAD is made by a biocompatible PDA/PAM hydrogel featuring ortho-hexagonal micropillars on the surface. The PDA/PAM hydrogel composition was optimized, balancing the hydrogel adhesive and mechanical strength to match the micropillar fabrication process. By studying the adhesion behavior of micropillar structures of various sizes, it is found that the liquid self-splitting and liquid self-sucking introduced by the microstructure were the synergistic mechanism of adhesion strength enhancement in the wet interface. The adhesion of MS-HAD in the wet interface is enhanced by 47% in comparison to a flat hydrogel adhesive (F-HAD). Finally, the application of the MS-HAD patches for ECG signal monitoring under dry and wet skins is demonstrated. For both dry and wet skins, the ECG signal measured by the MS-HAD is more stable and accurate compared to those measured by commercial gel electrodes and F-HAD. The MS-HAD reported here provides a potential adhesive electrode that could perform well in both wet and dry interfaces for future portable health monitoring devices.
中文翻译：
带有仿生树蛙微柱的水凝胶贴片，可增强附着力和排汗功能
水凝胶在湿和干界面均具有优异的粘附性、优异的生物相容性和导电性，对于生物医学工程和可穿戴电子产品非常重要。尽管已经开发出多种人造粘合剂来增强湿界面中的粘合力，但单一的粘合策略在复杂的粘合环境中具有局限性。受树蛙正六边形脚趾垫的启发，我们推出了一种微结构水凝胶粘合剂（MS-HAD），它结合了化学粘合剂和仿生微结构引入的排汗功能。这种 MS-HAD 由生物相容性 PDA/PAM 水凝胶制成，表面具有正六边形微柱。对 PDA/PAM 水凝胶成分进行了优化，平衡了水凝胶粘合剂和机械强度，以匹配微柱制造工艺。通过研究不同尺寸微柱结构的粘附行为，发现微结构引入的液体自分裂和液体自吸是湿界面粘附强度增强的协同机制。与平面水凝胶粘合剂 (F-HAD) 相比，MS-HAD 在湿界面中的粘附力提高了 47%。最后，演示了 MS-HAD 贴片在干皮肤和湿皮肤下监测心电图信号的应用。对于干皮肤和湿皮肤，MS-HAD 测量的心电信号比商用凝胶电极和 F-HAD 测量的心电信号更加稳定和准确。这里报道的 MS-HAD 提供了一种潜在的粘合电极，可以在未来便携式健康监测设备的湿式和干式界面中表现良好。
更新日期：2024-04-05
中文翻译：
带有仿生树蛙微柱的水凝胶贴片，可增强附着力和排汗功能
水凝胶在湿和干界面均具有优异的粘附性、优异的生物相容性和导电性，对于生物医学工程和可穿戴电子产品非常重要。尽管已经开发出多种人造粘合剂来增强湿界面中的粘合力，但单一的粘合策略在复杂的粘合环境中具有局限性。受树蛙正六边形脚趾垫的启发，我们推出了一种微结构水凝胶粘合剂（MS-HAD），它结合了化学粘合剂和仿生微结构引入的排汗功能。这种 MS-HAD 由生物相容性 PDA/PAM 水凝胶制成，表面具有正六边形微柱。对 PDA/PAM 水凝胶成分进行了优化，平衡了水凝胶粘合剂和机械强度，以匹配微柱制造工艺。通过研究不同尺寸微柱结构的粘附行为，发现微结构引入的液体自分裂和液体自吸是湿界面粘附强度增强的协同机制。与平面水凝胶粘合剂 (F-HAD) 相比，MS-HAD 在湿界面中的粘附力提高了 47%。最后，演示了 MS-HAD 贴片在干皮肤和湿皮肤下监测心电图信号的应用。对于干皮肤和湿皮肤，MS-HAD 测量的心电信号比商用凝胶电极和 F-HAD 测量的心电信号更加稳定和准确。这里报道的 MS-HAD 提供了一种潜在的粘合电极，可以在未来便携式健康监测设备的湿式和干式界面中表现良好。
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