Functionalizing Double-Network Hydrogels for Applications in Remote Actuation and in Low-Temperature Strain Sensing.,ACS Applied Materials & Interfaces

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Functionalizing Double-Network Hydrogels for Applications in Remote Actuation and in Low-Temperature Strain Sensing.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-06-11 , DOI: 10.1021/acsami.0c10430
Jin Zhang _{1,

2} , Liangdan Zeng _{1,

2} , Ziwen Qiao _{1,

2} , Jun Wang ₂ , Xiancai Jiang ₁ , Yu Shrike Zhang ₃ , Huanghao Yang ₂

Affiliation

Multifunctional hydrogels have important applications in various fields such as artificial muscles, wearable devices, soft robotics, and tissue engineering, especially for those with favorable mechanical properties, good low-temperature resistance, and stimuli-responsive capabilities. In the current study, a type of polyacrylamide/sodium alginate/carbon nanotube (PAAm/SA/CNT) double-network (DN) hydrogel was fabricated, which exhibited a high tensile strength of 271.68 ± 6.04 kPa, a favorable conductivity of 1.38 ± 0.17 S·m^–1, and a good self-healing ability under heating conditions. In addition, the composite hydrogel exhibited controllable photomechanical deformations under near-infrared irradiation, such as bending, swelling, swimming, and object grasping. To further broaden the applications of the hydrogel in low-temperature environments, calcium chloride (CaCl₂) was introduced into such a PAAm/SA/CNT DN hydrogel as an additive. Interestingly, the tensile/compressive strengths as well as elasticity were well-maintained at a temperature as low as −20 °C. In addition, the PAAm/SA/CNT/CaCl₂ hydrogel presented excellent conductivity, recoverability, and strain-sensing capability under such extreme conditions. Overall, the investigations conducted in this paper have provided potentially new methods and inspirations for the generation of multifunctional PAAm/SA/CNT/CaCl₂ hybrid DN hydrogels toward extended applications.

中文翻译：

功能化双网络水凝胶，用于远程驱动和低温应变传感。

多功能水凝胶在各个领域都有重要的应用，例如人造肌肉，可穿戴设备，软机器人和组织工程，特别是对于那些具有良好机械性能，良好的耐低温性和刺激响应能力的凝胶。在当前的研究中，制备了一种聚丙烯酰胺/藻酸钠/碳纳米管（PAAm / SA / CNT）双网（DN）水凝胶，其高拉伸强度为271.68±6.04 kPa，良好的电导率为1.38± 0.17 S·m ^–1，在加热条件下具有良好的自愈能力。此外，复合水凝胶在近红外辐射下表现出可控的光机械变形，例如弯曲，溶胀，游泳和抓紧物体。为了进一步拓宽水凝胶在低温环境中的应用，将氯化钙（CaCl ₂）作为添加剂添加到这种PAAm / SA / CNT DN水凝胶中。有趣的是，在低至-20℃的温度下，拉伸/压缩强度以及弹性得以良好地保持。另外，PAAm / SA / CNT / CaCl ₂在这种极端条件下，水凝胶具有出色的电导率，可恢复性和应变传感能力。总体而言，本文进行的研究为多功能PAAm / SA / CNT / CaCl ₂杂化DN水凝胶的产生为扩展应用提供了潜在的新方法和灵感。

更新日期：2020-07-08

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