Nanofiber Research Paper - 720 Words

Frequency dependence of the electromagnetic interference shielding effectiveness (EMI SE) of carbon fiber (CF)-epoxy composite laminates have been investigated on the basis of attenuation due to reflection and absorption measurements in the range of X-band (8.2-12.4 GHz) and Kuband (12.4-18 GHz). The shielding by absorption is observed to be the dominant mechanism. The use of nylon-66 nanofiber interleaving for increasing the shielding effectiveness of multilayered quasi-isotropic composite laminates has been investigated. Further enhancement of EMI SE is achieved by ÃŽ ³- irradiation of the composites. The results have highlighted the usefulness of the carbon fiber composites for shielding in the range of microwave frequencies. Index†¦show more content†¦Kunigal Shivakumar is with the Center for Composite Materials Research, Department of Mechanical Engineering, College of Engineering, North Carolina A T State University, Greensboro, NC 27411, USA. J. Sundara Rajan is with the VTU Research Centre, Central Power Research Institute, Bengaluru-560080, India. [2] and the ease of processing and manufacturing. A polymer matrix is electrically insulating and does not contribute to EM shielding on its own. However, polymer composites with conductive fillers are influenced by the interconnectivity of the conducting fillers within the polymer matrix. A conducting polymer has many advantages like reduced weight, lower density, flexibility of control of conductivity and lower manufacturing costs [3], [4]. In recent years, polymer based carbon filled composites consisting of a sandwich of a conductive polymer between a conductor and microwave absorber have been used in wideband microwave shielding [5]. The most frequently used EM absorbers consist of materials with high dielectric losses and magnetic loss materials. These materials include carbon filament [6], carbon fiber (CF) [7], carbon nanotubes [8], [9], carbon black [10], graphite [11], graphene oxide [12], metal fiber [13] and ferrites [14]. Microwave shielding of conducting polymer composites depends on the dielectric and magnetic properties of the materials used. In these materials, to achieve the benchmarkShow MoreRelatedComponents Of Thermoregulation ( Tm ) Systems And The Latent Thermal Energy Storage ( Ltes ) Essay1375 Words   |  6 PagesmK−1) greatly limits their heat dissipation performance in thermal management applications. Currently main focus of research is to increase the thermal conductivity of the PCMs. In this regard different kinds of materials such as metal and carbon composites with PCMs are produced. 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