Research Of Electromagnetic Heating System And Thermal Effect Of Nanomaterials

In recent years,electromagnetic hyperthermia comined with nanomaterials for cancer treatment has received wide attention from researchers.By exerting an external electromagnetic field on the nanomaterials injected into the cancerous area,the nanomaterials absorb the electromagnetic energy and cause the temperature to increase,thereby achieving the effect of killing the cancer cells.Therefore,the thermal effect of nanomaterials and the electromagnetic energy transmission technique are the key problems to be addressed.A wild range of nanomaterials have been investigated,such as metal nanomaterials,magnetic nanomaterials,carbon nanotubes.The heating frequencies are mainly RF,microwave,infrared.The heating methods include electric field heating,magnetic heating,and laser heating.The work of this project mainly focuses on the electromagnetic thermal effect of nanomaterials and the electromagnetic energy transmission technique.Based on the basic properties of nanomaterials,the thermal effects of nanomaterials under electric field,magnetic field and laser radiation are discussed.On the basis of Kanizus RF electric field heating system,a parallel capacitor coupled electric field heating system is designed and the field strength of the system is measured.In the 13.56MHz RF electric field generated by this system,the thermal effect of gold nanoparticles(AuNPs),silver nanoparticles(AgNPs)and silver nanowires(AgNWs)have been studied experimentally.The influence of the types,shapes,concentration and particle size of nanomaterials have been explored.The experimental results also show that the AgNWs dissolved in Isopar-H,with the active treatment of CH-5-hyperdispersant and Span-80 emulsifier,shows a very strong thermal effect,achieving a maximum of 46.3 ? temperature increase.Moreover,based on the antipodal Vivaldi antenna and the Koch snowflake fractal antenna,the heating system is designed and simulated,achieving good gain,transmission characteristics and directional characteristics which can meet the needs of the antenna heating system.