Abstract
Nickel-loaded larch chars were prepared by various methods and then molded into disk specimens to measure their electromagnetic shielding (EMS) capacities in the range of 50-800MHz. The capacity was dependent on carbonization temperature for char preparation, molding pressure, nickel loading, and the loading method. This is because the crystal structure of woody carbon and the density of a specimen were predominant factors in determining the EMS effect. The combination of carbonization at 900°C, molding at 5.9MPa, 4.5wt% loading of nickel by wet impregnation before carbonization was adequate for affording char a highly efficacious EMS capacity. These results show the feasibility of an easy and inexpensive production of an EMS material from wood by carbonization.
