Electromagnetic shielding properties of iron oxide impregnated kenaf bast fiberboard |
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| Affiliation: | 1. International and Interuniversity Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Priyadarshini Hills P.O., Kottayam 686 560, Kerala, India;2. Centre for Nanoscience and Nanotechnology, Amal Jyothi College of Engineering, Koovapally P.O., Kottayam, Kerala 686518, India;3. School of Chemical Sciences, Mahatma Gandhi University, Priyadarshini Hills P.O., Kottayam 686 560, Kerala, India;4. Department of Chemistry, St.Xavier''s College Vaikom, Kothavara P.O, Kottayam 686607, Kerala, India;1. Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran;2. Department of Materials Engineering, University of Tabriz, Tabriz, Iran;1. National Engineering Research Center of Novel Equipment for Polymer Processing, The Key Laboratory of Polymer Processing Engineering of Ministry of Education, South China University of Technology, Guangzhou, 510640, China;2. NSEC Center for Affordable Nanoengineering of Polymeric Biomedical Devices, The Ohio State University, Columbus, OH 43210, USA;3. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;1. College of Engineering and Technology, Northeast Forestry University, Harbin 150040, China;2. Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203, USA |
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| Abstract: | The electromagnetic shielding effectiveness of kenaf fiber based composites with different iron oxide impregnation levels was investigated. The kenaf fibers were retted for removing the lignin and extractives from the fibers and magnetized. Using the unsaturated polyester and the magnetized fibers, kenaf fiber based composites were manufactured by the compression molding process. The transmission energies of the composites were characterized when the composite samples were exposed under the irradiation of electromagnetic (EM) wave with a variable frequency from 9 GHz to 11 GHz. Using the Scanning Electron Microscope (SEM), the iron oxide nanoparticles were observed on the surfaces and inside the micropore structures of single fibers. As the Fe content increased from 0% to 6.8%, 15.9% and 18.0%, the total surface free energy of kenaf fibers with the magnetizing treatments increased from 44.8 mJ/m2 to 46.1 mJ/m2, 48.8 mJ/m2 and 53.0 mJ/m2, respectively, while the modulus of elasticity reduced from 2875 MPa to 2729 MPa, 2487 MPa and 2007 MPa, respectively. Meanwhile, the shielding effectiveness was increased from 30–50% to 60–70%, 65–75% and 70–80%, respectively. |
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| Keywords: | E Compression moulding A Fibres B Magnetic properties B Microstructures B Strength |
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