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Start Over Author "Li, Qingsong" Publisher elsevier b.v.
152 results on '"Li, Qingsong"'

49. Roll-to-roll joule-heating to construct ferromagnetic carbon fiber felt for superior electromagnetic interference shielding.

Author

Wu, Yufeng, Li, Qingsong, Li, Yunzhi, Li, Chang, Zhou, Yiqian, Du, Peng, Cao, Wanting, He, Xian, Liu, Zian, Xu, Jianchun, Huang, Kai, Lei, Ming, Bi, Ke, and Wu, Hui

Subjects
*IRON oxide nanoparticles, *IRON oxides, *ELECTROMAGNETIC shielding, *ELECTROMAGNETIC interference, *CARBON fibers
Abstract

The effective safeguard from electromagnetic radiation damage via electromagnetic interference shielding (EMI) materials is crucial for diverse applications, especially in modern aerospace, medical, and human body protection endeavors. Despite great efforts have been made to surmount challenges encompassing scalability, sustainability and cost, the integrated and continuous production of large-area electromagnetic shielding materials remains unsolved for industrial-scale demands. Herein, we develop a cascaded methodology involving spray loading and Joule-heating for fabricating hybrid EMI fabric with superior efficiency, where ferromagnetic Fe 3 O 4 nanoparticles are further successfully in situ deposition on ultralight carbon fiber felt (Fe 3 O 4 /FePc@CFF) in a roll-to-roll (R2R) manner. Fe 3 O 4 /FePc@CFF characterized by a surface density of only 64.76 g/m2, achieves specific shielding effectiveness per unit thickness (SSE/t) remarkable values of 9604 dB cm2 g−1 and 10947 dB cm2 g−1 within the X-band and Ku-band, respectively. Considering the high compatibility with assembly on flow line production, this research offers substantial development potential for further design and advancement of pivotal materials in the realm of electromagnetic protection. [Display omitted] [ABSTRACT FROM AUTHOR]

Published
2024
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50. Iodine cation bridged graphene sheets with strengthened interface combination for electromagnetic wave absorption.

Author

Li, Qingsong, Li, Shitong, Liu, Qiangchun, Liu, Xiaofang, Shui, Jianglan, and Kong, Xiangkai

Subjects
*ELECTROMAGNETIC wave absorption, *IODINE, *GRAPHENE, *AEROGELS, *CHARGE exchange, *GRAPHENE oxide
Abstract

Graphene-based metal-free aerogel is desirable for lightweight electromagnetic wave (EMW) absorbing materials. However, the weak van-der-Waals combination between graphene sheets, accompanied by the repulsion from surface oxygen-related polar groups, significantly hinder the transfer of electrons between the sheets, and lead to poor mechanical strength. These become bottlenecks for the further improvement of EMW absorption and have a huge impact on achieving multi-functions. Here, we used an iodine modification strategy to fabricate reduced graphene oxide (RGO) aerogel, in which graphene sheets are bridged by iodine cations (I+). Meanwhile, iodine promotes the conversion of epoxy groups to hydroxyl groups on graphene, thereby facilitating the adhension of I+ on the surface. These iodine cations rather than iodine anions are essential to strengthen the interconnection between graphene sheets, which enables the RGO aerogel to exhibit higher electrical conductivity, larger mechanical strength, higher thermal stability, and significantly improved EMW absorbing capability. With the improvement in conduction loss and impedance matching, the iodine-bridged RGO aerogel exhibits a maximium reflection loss of −52.8 dB and an effective absorption bandwidth of 7.2 GHz at 2 wt% filler loading, which are 3.8 and 1.5 times of pure RGO, respectively. Besides, the improved mechanical strength and resistance to temperature change benefit expanding the application fields of this aerogel. [Display omitted] [ABSTRACT FROM AUTHOR]

Published
2021
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