Microwave permittivity and dielectric relaxation of a high surface area activated carbon |
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Authors: | Email author" target="_blank">JE?AtwaterEmail author RR?Wheeler Jr |
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Institution: | (1) UMPQUA Research Company, P.O. Box 609, 97457 Myrtle Creek, Oregon, USA |
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Abstract: | Carbonaceous materials are amenable to microwave heating to varying degrees. The primary indicator of susceptibility is the complex permittivity ( *), of which, the real component correlates with polarization, and the imaginary term represents dielectric loss. For a given material, the complex permittivity is dependent upon both frequency and temperature. Here we report the complex permittivity of a high surface area coconut shell activated carbon which is commonly used in analytical chemistry and a wide variety of industrial separations. Associated polarization-relaxation phenomena are also characterized. Broadband measurements were made using a high temperature compatible open-ended coaxial dielectric probe at frequencies between 0.2 and 26 GHz, and across the temperature region between 24 °C and 191 °C. PACS 77.22.-d |
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