霍夫迈斯特效应诱导的多尺度结构纳米纤维素摩擦电气凝胶,Advanced Functional Materials

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霍夫迈斯特效应诱导的多尺度结构纳米纤维素摩擦电气凝胶
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-08-28 , DOI: 10.1002/adfm.202306810
Bin Luo ₁ , Chenchen Cai ₁ , Tao Liu ₁ , Xiangjiang Meng ₁ , Xinli Zhuang ₁ , Yanhua Liu ₁ , Cong Gao ₁ , Mingchao Chi ₁ , Song Zhang ₁ , Jinlong Wang ₁ , Yayu Bai ₁ , Shuangfei Wang ₁ , Shuangxi Nie ₁

Affiliation

自供电可穿戴电子产品的出现将彻底改变智能医疗和运动监测领域。这种技术进步对摩擦电材料提出了更严格的设计要求。摩擦电气凝胶必须增强其机械性能，以解决实际应用中的结构倒塌问题。这项研究制造了由霍夫迈斯特效应诱导的具有多尺度结构的刚性纳米纤维素摩擦电气凝胶。霍夫迈斯特效应增强了聚合物分子链的聚集和结晶，而冰晶生长赋予气凝胶微米级的多孔结构。因此，摩擦电气凝胶表现出卓越的刚度，杨氏模量高达142.9 MPa，比模量高达340.6 kN m kg –1 ^，即使在支撑其重量6600倍后仍保持不变形。即使在承受 343 kPa 的冲击后，由摩擦电气凝胶制成的高度耐用的可穿戴自供电传感器仍然可以运行。此外，自供电传感器能够准确检测人体运动，特别是异常跌倒姿势检测。该研究对于促进自供电可穿戴电子产品的材料设计和拓宽应用场景具有相当的研究和实用价值。

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Multiscale Structural Nanocellulosic Triboelectric Aerogels Induced by Hofmeister Effect

The advent of self-powered wearable electronics will revolutionize the fields of smart healthcare and sports monitoring. This technological advancement necessitates more stringent design requirements for triboelectric materials. The triboelectric aerogels must enhance their mechanical properties to address the issue of structural collapse in real-world applications. This study fabricates stiff nanocellulosic triboelectric aerogels with multiscale structures induced by the Hofmeister effect. The aggregation and crystallization of polymer molecular chains are enhanced by the Hofmeister effect, while ice crystal growth imparts a porous structure to the aerogel at the micron scale. Therefore, the triboelectric aerogel exhibits exceptional stiffness, boasting a Young's modulus of up to 142.9 MPa and a specific modulus of up to 340.6 kN m kg^–1, while remaining undeformed even after supporting 6600 times its weight. Even after withstanding an impact of 343 kPa, highly robust wearable self-powered sensors fabricated with triboelectric aerogels remain operational. Additionally, the self-powered sensor is capable of accurately detecting human movements, particularly in abnormal fall postures detection. This study provides considerable research and practical value for promoting material design and broadening application scenarios for self-powered wearable electronics.

更新日期：2023-08-28

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