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Mechanism of microwave-assisted syntheses

Author: langfeng1 Time: 2017-07-12

Microwave irradiation is an electromagnetic irradiation in the range of wavelengths from 0.01 m to 1 m

with corresponding frequency range from 300 MHz to 300 GHz. The domestic microwave generally owns

a frequency of 2.45 GHz (a wavelength of 12.25 cm), while the industrial microwave usually owns two

frequencies of 915 MHz and 2.45 GHz.Microwave has been widely used for heating those materials, which

can absorb microwave energy and convert it into heat. In the presence of moisture or water, dielectric

heating happens due to the dipolar nature of water. These permanently polarized dipolar molecules could

rearrange in the direction of the electric field at a high speed, which would cause internal friction of molecules

and further result in the volumetric heating of the whole material. Besides the dipolar mechanism, microwave

heating may also occur due to the ionic mechanism, and oscillatory migration of ions in the material would

generate heat under a high-frequency oscillating electric field. Consequently, microwave-assisted technology

can provide a fast and effective approach to heat the material/system homogeneously from the interior. In

contrast, traditional heating system, in which heat is transferred from the surface toward the center of the

material under the help of heating mantle, water/oil bath or other external heat source, is relatively slow and inefficient.

Changsha Langfeng Microwave Technology Co., Ltd.

TAG:  Mechanism of microwave-assisted syntheses
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