Two methods are widely used to improve absorbing properties of the microwave magnetism absorbing agent: mixing with the other material such as resistance carbon fiber absorbent, or wrapping the microwave magnetism-absorbing agent in that material. However, do these two methods coincide with each other? If not, which method should be used as better way to represent the absorbing properties of magnetism-absorbing agents? To answer these questions, both methods are carried out on the same magnetism absorbing agents, of which the results are compared. Distinct difference between these measured results is found, and the possible reasons for the difference are also discussed.

Engineered nanoparticles have been extensively used in electronics, energy, materials and biomedical areas. Engineered nanoparticles with unique magnetic, luminescent, and catalytic properties can not only benefit human society, but also cause potentially harmful interactions with living systems. This study was aimed at assessing the cytotoxicity of CuO ENPs, TiO2ENPs, CeO2ENPs, SWCNTs in human lung epithelial cell line (A549). Herein, we performed a comprehensive study on the cytotoxicity of four different ENPs by examining the viability of A549 cells. The results showed that CuO ENPs could cause a highest dose-dependent cytotoxicity, SWCNTs were more toxic than TiO2ENPs and CeO2ENPs to A549 cells, TiO2ENPs induced a slight loss of cell viability at 100 mg/L and CeO2ENPs had no obvious cytotoxicity. These effects were dose related, and should be considered in the application of different areas of ENPs.