No abstract

Phase-change materials (PCMs) are essential modern materials for storing thermal energy in the form of sensible and latent heat, which play important roles in the efficient use of waste heat and solar energy. In the development of PCM technology, many types of materials have been studied, including inorganic salt and salt hydrates and organic matter such as paraffin and fatty acids. Considerable research has focused on the relationship between the material structure and energy storage properties to understand the heat storage/emission mechanism involved in controlling the energy storage performance of materials. In this study, we review the application of various carbon-filled organic PCMs in the field of heat storage and describe the current state of this research.

The crystallographic texture and microstructure of electrogalvanized Zn layers on a mild steel cathode were studied with reference to the galvanizing variables including current density and chloride addition. Increasing the current density reduced the relative density of Zn basal planes parallel to the cathode surface. This phenomenon was attributed to the outgrowth of nonbasal planes within an ion-depleted zone close to the metal substrate surface under high cathode overvoltage induced by the high current density. Chloride addition also affected the cathode overvoltage and subsequently the texture of the Zn layer. The effect depended on chloride concentration and temperature. Increasing the current density or adding chloride enhanced the hardness of the electrodeposited layer, as a result of grain size refinement and solid solution hardening.

No abstract

In this study, soft magnetic metal was coated on carbon fibers (CFs) using an electroless FeCoNi-plating method to enhance the electromagnetic interference (EMI) shielding properties of CFs. Scanning electron microscopy, X-ray diffraction, and a vibrating sample magnetometer were employed to determine the morphologies, structural properties, and magnetic properties of the FeCoNi-CFs, respectively. The EMI shielding behavior of the FeCoNi-CFs was investigated in the frequency range of 300 kHz to 3 GHz through vector network analysis. The EMI shielding properties of the FeCoNi-CFs were significantly enhanced compared with those of the as-received CFs. The highest EMI shielding effectiveness of the 60-FeCoNi-CFs was approximately 69.4 dB at 1.5 GHz. The saturation magnetization and coercivity of the 60-FeCoNi-CFs were approximately 103.2 emu/g and 46.3 Oe, respectively. This indicates that the presence of FeCoNi layers on CFs can lead to good EMI shielding due to the EMI adsorption behavior of the magnetic metal layers.