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Preparation of Hemicellulose Nanoparticle-Containing Ionic Hydrogels with High Strength, Self-Healing, and UV Resistance and Their Applications as Strain Sensors and Asymmetric Pressure Sensors
Biomacromolecules ( IF 5.5 ) Pub Date : 2022-04-29 , DOI: 10.1021/acs.biomac.1c01640
Xiaoqi Gong 1 , Chenglong Fu 1 , Nur Alam 2 , Yonghao Ni 1, 2 , Lihui Chen 1 , Liulian Huang 1 , Huichao Hu 1
Biomacromolecules ( IF 5.5 ) Pub Date : 2022-04-29 , DOI: 10.1021/acs.biomac.1c01640
Xiaoqi Gong 1 , Chenglong Fu 1 , Nur Alam 2 , Yonghao Ni 1, 2 , Lihui Chen 1 , Liulian Huang 1 , Huichao Hu 1
Affiliation
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Smart functional fillers can significantly enhance the comprehensive properties of ionic hydrogels, such as their mechanical properties, which are key features of hydrogels in wearable sensor applications. As a plant-derived natural polymer, hemicellulose can serve as smart functional fillers. In this study, tannic acid-modified hemicellulose nanoparticles (TA@HC) and Fe3+ were used in the preparation of PAA/TA@HC/Fe3+ hydrogels. The addition of TA@HC and Fe3+ in the sodium persulfate (SPS) and acrylic acid (AA) polymerization system resulted in a fast gelation process that was completed within a short time (as short as 30 s) at room temperature. The catechol-rich TA and Fe3+ system allows for quick activation of SPS to produce free radicals, generating abundant hydroxyl groups in a short period of time, which was responsible for the fast gelation. Furthermore, due to the TA@HC effect and the dynamic catechol (TA)-Fe3+ redox system, the PAA/TA@HC/Fe3+ hydrogel exhibited excellent mechanical properties with an exceptionally high strain (as high as 5600%), adhesiveness, rapid and efficient self-healing ability, and reproducible self-adhesion onto various substrates. More importantly, asymmetric adhesive PAA/TA@HC/Fe3+ hydrogels were prepared by selective Fe3+ coating of the upper hydrogel surface to render the top surface nonadhesive so that the same hydrogel with different adhesiveness between the upper and bottom surfaces was obtained. The asymmetric adhesive hydrogel design permits the adhesive side to fit comfortably to the skin and the nonadhesive side showing anti-interference against various different pollutant materials, accurately serving as a pressure sensor.
中文翻译：
高强度、自修复和抗紫外线的含半纤维素纳米粒子离子水凝胶的制备及其作为应变传感器和不对称压力传感器的应用
智能功能填料可以显着增强离子水凝胶的综合性能，例如机械性能，这是水凝胶在可穿戴传感器应用中的关键特性。作为一种源自植物的天然聚合物，半纤维素可作为智能功能性填料。在本研究中，单宁酸修饰的半纤维素纳米粒子（TA@HC）和Fe 3+用于制备PAA/TA@HC/Fe 3+水凝胶。在过硫酸钠 (SPS) 和丙烯酸 (AA) 聚合体系中添加 TA@HC 和 Fe 3+导致在室温下短时间内（短至 30 秒）完成快速凝胶化过程。富含儿茶酚的 TA 和 Fe 3+体系允许快速激活SPS产生自由基，在短时间内产生大量羟基，这是快速凝胶化的原因。此外，由于 TA@HC 效应和动态儿茶酚 (TA)-Fe 3+氧化还原体系，PAA/TA@HC/Fe 3+水凝胶表现出优异的机械性能和极高的应变（高达 5600%） 、粘合性、快速高效的自修复能力，以及在各种基材上的可重复自粘合性。更重要的是，通过选择性Fe 3+制备了不对称粘性PAA/TA@HC/Fe 3+水凝胶。对上水凝胶表面进行涂层处理，使上表面无粘性，从而获得相同的水凝胶，其上下表面之间的粘性不同。不对称的粘性水凝胶设计使粘性面能够舒适地贴合皮肤，非粘性面对各种不同的污染物材料具有抗干扰性，可准确地用作压力传感器。
更新日期：2022-04-29
中文翻译：
高强度、自修复和抗紫外线的含半纤维素纳米粒子离子水凝胶的制备及其作为应变传感器和不对称压力传感器的应用
智能功能填料可以显着增强离子水凝胶的综合性能，例如机械性能，这是水凝胶在可穿戴传感器应用中的关键特性。作为一种源自植物的天然聚合物，半纤维素可作为智能功能性填料。在本研究中，单宁酸修饰的半纤维素纳米粒子（TA@HC）和Fe 3+用于制备PAA/TA@HC/Fe 3+水凝胶。在过硫酸钠 (SPS) 和丙烯酸 (AA) 聚合体系中添加 TA@HC 和 Fe 3+导致在室温下短时间内（短至 30 秒）完成快速凝胶化过程。富含儿茶酚的 TA 和 Fe 3+体系允许快速激活SPS产生自由基，在短时间内产生大量羟基，这是快速凝胶化的原因。此外，由于 TA@HC 效应和动态儿茶酚 (TA)-Fe 3+氧化还原体系，PAA/TA@HC/Fe 3+水凝胶表现出优异的机械性能和极高的应变（高达 5600%） 、粘合性、快速高效的自修复能力，以及在各种基材上的可重复自粘合性。更重要的是，通过选择性Fe 3+制备了不对称粘性PAA/TA@HC/Fe 3+水凝胶。对上水凝胶表面进行涂层处理，使上表面无粘性，从而获得相同的水凝胶，其上下表面之间的粘性不同。不对称的粘性水凝胶设计使粘性面能够舒适地贴合皮肤，非粘性面对各种不同的污染物材料具有抗干扰性，可准确地用作压力传感器。
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