Formulation and characterizations of magnetic inks for flexographic printing employed as electromagnetic shields

The purpose of the project is the formulation and characterization of magnetic inks for flexographic printing to evalue their suitable as electromagnetic shields, assessing the effects of micro/nano particles featuring different sizes. The smallest magnetite based nanoparticles ware synthesized by precipitation of iron salts in an alkaline aqueous medium or by using sonochemistry process [1]. The formulation is based on the mixing of the different micro/nano powders with a compatible UV/EB curable polymer so forming the related composite material. The so-obtained inks were characterized morphologically by scanning electron microscopy (SEM) or transmission electron microscope (TEM). The magnetic characterization was performed by vibrating sample magnetometer (VSM) both in liquid and and on flexible substrates after printing. Finally, the absorption properties of different inks were evaluated with an RF-attenuator.