Tinghui Deng, Bai Wang, Dongshu Chen, Siyu Han, Jie Ren, Shujun Liu, Jianshe Hu
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引用次数: 0
Abstract
Flexible sensors are critical for monitoring the vital signs of firefighters but face substantial challenges in urgent scenarios (e.g., emergency rescues), including mechanical damage, biofouling, and high-temperature instability. To address these issues, we developed a polyurea-based ionogel (Pub-xIL) via a catalyst-free ambient synthesis strategy, in which ionic liquids are incorporated into polyurea matrices. By tuning molecular ratios (PPG2000/PPG400 and MDI/HMDI), hierarchical H-bond networks were engineered, endowing Pub-xIL with exceptional mechanical properties: tensile strength of 1.7 MPa, puncture resistance (6.95 N load capacity), tear resistance (fracture energy = 2989 J/m2), and self-healing properties. Standardized quantitative wear resistance analysis showed that Pub-xIL had a wear index of 0.046 mg/cycle, outperforming traditional flexible sensor substrates such as polydimethylsiloxane, polyimide, and polyethylene terephthalate. Additionally, Pub-xIL maintained stable performance across a broad temperature range (−20 to 60 °C). The functional ionic liquid [EMIM][TFSI] confers dual advantages on Pub-xIL: it achieves >99 % inhibition rates against Staphylococcus aureus and Escherichia coli and yields a high strain coefficient (GF = 3.79, enabling precise motion detection). Integrating the Pub-xIL sensor array with machine learning algorithms enabled real-time classification of dynamic movements (e.g., walking, running) and static postures (e.g., standing, lying down) with a classification accuracy over 96 %. This work enhances situational awareness and survival prospects in life-critical rescue missions, while establishing a pioneering platform for next-generation firefighting wearable systems.
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.