使用单宁酸纳米花增韧的防污、粘性多两性离子水凝胶电极,ACS Applied Materials & Interfaces

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使用单宁酸纳米花增韧的防污、粘性多两性离子水凝胶电极
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-10-01 , DOI: 10.1021/acsami.2c14614
Zhiliang Han ₁ , Shiyan Chen ₁ , Lili Deng ₁ , Qianqian Liang ₁ , Xiangyang Qu ₁ , Jing Li ₁ , Baoxiu Wang ₁ , Huaping Wang ₁

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具有良好粘附性能的导电多两性离子水凝胶在可植入电极和电子设备中显示出潜在的前景。通过引入儿茶酚基团可以改善多两性离子水凝胶在潮湿环境中的粘合性能。然而，常见的儿茶酚改性剂通常可以淬灭自由基，导致长期组织粘附和水凝胶韧性之间的矛盾。通过将单宁酸 (TA) 添加到粘土纳米片和纳米纤维的分散体中，我们设计了 TA 包覆的纳米花和纳米纤维作为增强相，以制备具有粘附性能的多两性离子水凝胶。水凝胶结合了贻贝状和两性离子共粘附机制，可在水下环境中保持长期粘附。尤其是，³ . 该水凝胶还具有优异的抗生物污染性能，并显示出对细菌和细胞的抵抗力。此外，水凝胶具有低模量（<10 kPa）和离子电导率（0.25 S/m），使其成为制备植入式电极的理想材料。

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Anti-Fouling, Adhesive Polyzwitterionic Hydrogel Electrodes Toughened Using a Tannic Acid Nanoflower

Conductive polyzwitterionic hydrogels with good adhesion properties show potential prospect in implantable electrodes and electronic devices. Adhesive property of polyzwitterionic hydrogels in humid environments can be improved by the introduction of catechol groups. However, common catechol modifiers can usually quench free radicals, resulting in a contradiction between long-term tissue adhesion and hydrogel toughness. By adding tannic acid (TA) to the dispersion of clay nanosheets and nanofibers, we designed TA-coated nanoflowers and nanofibers as the reinforcing phase to prepare polyzwitterionic hydrogels with adhesion properties. The hydrogel combines the mussel-like and zwitterionic co-adhesive mechanism to maintain long-term adhesion in underwater environments. In particular, the noncovalent cross-linking provided by the nanoflower structure effectively compensates for the defects caused by free-radical quenching so that the hydrogel obtained a high stretchability of over 2900% and a toughness of 1.16 J/m³. The hydrogel also has excellent anti-biofouling property and shows resistance to bacteria and cells. In addition, the hydrogel possesses a low modulus (<10 kPa) and ionic conductivity (0.25 S/m), making it an ideal material for the preparation of implantable electrodes.

更新日期：2022-10-01

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