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Preparation and Investigation of Fe3O4@rGO/CNF Foams for Electromagnetic Interference Shielding
Mengmeng Li,Qiuyu Xu,Wei Jiang,Amjad Farooq,Yirui Qi,Lifang Liu 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
Herein, Fe3O4nanoparticles and graphene oxide (GO) are compounded first, followed by the addition of cellulose nanofiber(CNF) and l-ascorbic acid, to obtain Fe3O4@reduced graphene oxide (rGO)/CNF foams via the freeze-drying method. Theelectrical conductivity and magnetism of as-prepared foams were improved due to the presence of rGO and Fe3O4,whichis suitable for electromagnetic interference (EMI) shielding material. The results exhibit that Fe3O4@rGO/CNF foams allpossess a porous structure, and the optimized foam shows an EMI shielding effectiveness value of ~ 23 dB in the X-band. The good EMI shielding performance of the Fe3O4@rGO/CNF foam originates from the synergy of its composition andstructure. This work could provide a reference for the design and fabrication of novel EMI shielding materials.
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Hussaini Abdullahi Umar,Xiaohui Zeng,Xuli Lan,Huasheng Zhu,Yirui Li,Haichuan Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
Filling layer self-compacting concrete (FLSCC) is an essential material used in the construction of China Rail Track System type III (CRTS III) slab track of high-speed rail. The mechanical properties of the filling layer are of paramount significance to the performance and serviceability of the track system. In this study, asphalt emulsion (AE) was incorporated into the FLSCC, and various properties related to workability, strength, durability, and damping performance were experimentally evaluated. The effect of AE on the durability of FLSCC was investigated through water absorption, sorptivity, and rapid chloride ion penetration tests; while damping properties were evaluated using impact resonance method. Results show that addition of AE decreases the compressive and split tensile strength while flexural strength increases, especially at lower AE content. The durability properties were greatly enhanced with the addition of AE, which results from the decreased permeability of FLSCC specimens due to the pore-filling effect of asphalt film that flows and fills the pores and cracks of the matrix. Damping ratio of FLSCC increased by 22.8%, 23.7%, 25%, and 30.6% through the addition of 5%, 10%, 15%, and 20% AE, respectively. According to the findings of this study, AE content up to 10% is recommended for FLSCC production.
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