Abstract
This paper presents the design and realization of a microwave applicator at 2.45 GHz for the synthesis of gold nanoparticles. The particles are dissolved in N, N-dimethylformamide (DMF). The heating rate is approximately 8 K/s to achieve a short crystallization time. For a proper applicator design it is necessary to know the dielectric properties of DMF. Therefore, the complex permittivity of DMF at 2.45 GHz is measured in a temperature range from 20 °C to 80 °C. The final applicator design is presented together with simulation results for the electric and thermal field distributions. The calculation of the temperature distribution is done with Comsol Multiphysics™ and considers mutual coupling between the electric and thermal field. To avoid overheating, a thermal controller is developed to control microwave power in dependency of the liquid’s temperature. Finally, measurement results for matching and achieved heating rate are presented.
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