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Ionic Liquid/Water Binary Solvent Anti-Freezing Hydrogel for Strain and Temperature Sensors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-01-18 , DOI: 10.1021/acsami.3c19136 Jingying Liu 1 , Xinyi Zhang 1 , Ying Cui 2 , Yunlong Liu 2 , Wenjun Wang 2 , Yuxin Guo 3 , Qian Wang 1 , Xiaochen Dong 1, 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-01-18 , DOI: 10.1021/acsami.3c19136 Jingying Liu 1 , Xinyi Zhang 1 , Ying Cui 2 , Yunlong Liu 2 , Wenjun Wang 2 , Yuxin Guo 3 , Qian Wang 1 , Xiaochen Dong 1, 3
Affiliation
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Hydrogels are widely applied in the flexible wearable electronic devices field owing to their skin-like stretchability, superb biocompatibility, and high conductivity retention under mechanical deformations. Nevertheless, hydrogels are prone to freezing at low temperatures and losing water at high temperatures, which seriously limits their practical applications. Herein, a binary solvent system of ionic liquid (1-ethyl-3-methylimidazolium chloride) and water was prepared to endow the ionic hydrogel high ionic conductivity (0.28 S m–1 at 25 °C), high transparency (94.26%), and superior freezing tolerance (−50 °C). The multiple hydrogen bonds formed among polymer chains, water, and ionic liquids significantly improved the mechanical properties of the ionic hydrogel, enabling excellent tensile properties (strain >1800%) and durability (1000 times at 100% strain). Moreover, the ionic hydrogel was further assembled into a dual-response sensor, which exhibited satisfactory sensitivity to both tension (gauge factor = 2.15 at 200% strain) and temperature (temperature coefficient of resistance = −1.845%/°C) and can be applied for human motion and body temperature monitoring. This study provides a versatile method for preparing multifunctional hydrogels with a wide range of applications and lays the groundwork for human movement detection and smart health care.
中文翻译：
用于应变和温度传感器的离子液体/水二元溶剂防冻水凝胶
水凝胶因其类皮肤的拉伸性、优异的生物相容性以及机械变形下的高电导率保持性而被广泛应用于柔性可穿戴电子设备领域。然而，水凝胶在低温下容易冻结，在高温下容易失水，严重限制了其实际应用。在此，制备了离子液体（1-乙基-3-甲基氯化咪唑鎓）和水的二元溶剂体系，赋予离子水凝胶高离子电导率（25℃时为0.28 S m –1 ）、高透明度（94.26%）、和卓越的耐冷冻性（−50°C）。聚合物链、水和离子液体之间形成的多个氢键显着提高了离子水凝胶的机械性能，使其具有优异的拉伸性能（应变> 1800％）和耐久性（100％应变下1000次）。此外，离子水凝胶进一步组装成双响应传感器，对张力（200％应变下的应变系数= 2.15）和温度（电阻温度系数= -1.845％/°C）表现出令人满意的灵敏度，并且可以应用于人体运动和体温监测。该研究为制备具有广泛应用的多功能水凝胶提供了一种通用的方法，为人体运动检测和智能医疗奠定了基础。
更新日期：2024-01-18
中文翻译：
用于应变和温度传感器的离子液体/水二元溶剂防冻水凝胶
水凝胶因其类皮肤的拉伸性、优异的生物相容性以及机械变形下的高电导率保持性而被广泛应用于柔性可穿戴电子设备领域。然而，水凝胶在低温下容易冻结，在高温下容易失水，严重限制了其实际应用。在此，制备了离子液体（1-乙基-3-甲基氯化咪唑鎓）和水的二元溶剂体系，赋予离子水凝胶高离子电导率（25℃时为0.28 S m –1 ）、高透明度（94.26%）、和卓越的耐冷冻性（−50°C）。聚合物链、水和离子液体之间形成的多个氢键显着提高了离子水凝胶的机械性能，使其具有优异的拉伸性能（应变> 1800％）和耐久性（100％应变下1000次）。此外，离子水凝胶进一步组装成双响应传感器，对张力（200％应变下的应变系数= 2.15）和温度（电阻温度系数= -1.845％/°C）表现出令人满意的灵敏度，并且可以应用于人体运动和体温监测。该研究为制备具有广泛应用的多功能水凝胶提供了一种通用的方法，为人体运动检测和智能医疗奠定了基础。
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