Non-hygroscopic ionogel-based humidity-insensitive iontronic sensor arrays for intra-articular pressure sensing  

作　　者：Junli Shi Sai Xie Zhiguang Liu Minkun Cai Chuan Fei Guo 

机构地区：[1]Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [2]Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《National Science Review》2024年第11期177-187,共11页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(T2225017 and 52073138);the Science Technology and Innovation Committee of Shenzhen Municipality(JCYJ20210324120202007);the Shenzhen Sci-Tech Fund(YTDPT20181011104007);the Guangdong Provincial Key Laboratory Program(2021B1212040001).

摘　　要：Implanted pressure sensors can provide pressure information to assess localized health conditions of specific tissues or organs,such as the intra-articular pressure within knee joints.However,the prerequisites for implanted sensors pose greater challenges than those for wearables or for robots:aside from biocompatibility and tissue-like softness,they must also exhibit humidity insensitivity and high-pressure resolution across a broad pressure spectrum.Iontronic sensors can provide superior sensing properties,but they undergo property degradation in wet environments due to the hygroscopic nature of their active component:ionogels.Herein,we introduce a humidity-insensitive iontronic sensor array based on a hydrophobic and tough ionogel polymerized in a hydrophobicity transition yielding two hydrophobic phases:a soft liquid-rich phase that enhances ionic conductivity and ductility,and a stiff polymer-rich phase that contributes to superior toughness.We demonstrate the in vivo implantation of these sensor arrays to monitor real-time intra-articular pressure distribution in a sheep model,while assessing knee flexion with an angular resolution of 0.1°and a pressure resolution of 0.1%.We anticipate that this sensor array will find applications in various orthopedic surgeries and implantable medical devices.

关 键 词：iontronic pressure sensor phase separation humidity-insensitive ionogel BIOCOMPATIBILITY intra-articular pressure sensing 

分 类 号：O469[理学—凝聚态物理]