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Your search keyword '"Ou, Rongxian"' showing total 126 results
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126 results on '"Ou, Rongxian"'

23. Ultrastrong and Thermo‐Remoldable Lignin‐Based Polyurethane Foam Insulation with Active‐Passive Fire Resistance.

Author

Sun, Lichao, Guo, Yujia, Ou, Rongxian, Xu, Jingwen, Gao, Fei, Meng, Qingzhi, Chen, Sili, Guo, Chuigen, Fan, Qi, and Wang, Qingwen

Subjects
VAPOR barriers, URETHANE foam, THERMAL insulation, ATMOSPHERIC pressure, WATER vapor, FOAM
Abstract

Foam thermal insulators are indispensable for prevailing energy‐saving engineering, however their widespread use brings intractability such as unsustainability, "white pollution", and fire hazards. The emergence of bio‐based foams is highly appreciated, but the fabrication approaches are economically unattractive and/or the product properties are inferior, making their large‐scale implementation unviable. Herein, a versatile, thermally remoldable phosphate‐containing polyurethane composite foam (LPU‐G) is constructed from natural lignin and expanded graphite flakes via an atmospheric pressure and scalable one‐pot strategy. The optimal LPU‐G exhibits exceptional mechanical strength, capable of supporting over 6000 times its weight without significant deformation. Moreover, the LPU‐G demonstrates the desired multifunctionality in handling extreme circumstances, including humidity‐tolerant thermal insulation, superb water vapor barrier, and withstanding ≈1200 °C flame without ignition. Based on the "expansion‐conductivity" micro‐mechanism, LPU‐G is the first foam material to be constructed as a sensitive fire alarm system with an ultra‐long alarm time (>1800 s). Surprisingly, LPU‐G can be rapidly upcycled into recyclable bulk composites for a second life through simple thermo‐molding processes rooted in the multi‐dynamic behavior of the phosphate, carbamate, and hydrogen bonds. The easy‐to‐scale LPU‐G represents a new generation of thermal insulators that address concerns regarding unsustainability, high cost, fire risk, and inferior mechanical properties. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Multimodal Hydrogel‐Based Respiratory Monitoring System for Diagnosing Obstructive Sleep Apnea Syndrome.

Author

Liu, Jing, Wang, Haiyan, Liu, Tao, Wu, Qinan, Ding, Yonghui, Ou, Rongxian, Guo, Chuigen, Liu, Zhenzhen, and Wang, Qingwen

Subjects
SLEEP apnea syndromes, VENTILATION monitoring, RESPIRATORY organs, HYDROGELS, DIAGNOSIS, HYDROGEN bonding
Abstract

Real‐time monitoring of respiration is vital for human health, especially for forecasting the sleep‐related diseases. A respiratory monitoring system with high accuracy, wearing comfort, portability, and environmental tolerance, is highly desirable, which however remains a big challenge. Here, a multimodal hydrogel sensor with excellent comprehensive performance is fabricated to monitor respiration and diagnose obstructive sleep apnea syndrome (OSAS). The synthetic cellulose‐based hydrogel exhibits good mechanical properties and extreme temperature tolerance, ascribing to the synergistic effects between chemical cross‐linking and multiple hydrogen bonding within the hydrogel network. The fabricated hydrogel sensor can independently monitor the mechanical variation and the thermal change via output signals of capacitance and resistance, respectively. These extraordinary properties of the hydrogel sensor enable the highly reliable and accurate monitoring of the respiratory events and diagnosis of OSAS. This work provides the new and practical way for real‐time respiratory monitoring and preventing the occurrence of sleep‐related diseases. [ABSTRACT FROM AUTHOR]

Published
2022
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