Microwave dielectric heating effect

D. M. P. Mingos, A. G. Whittaker, Microwave Dielectric Heating Effects in Chemical Synthesis in Chemistry under Extreme or non-Classical Conditions,... 

Mingos, D.M.P. and Baghurst, D.R., Applications of microwave dielectric heating effects to synthetic problems in chemistry, Chem. Soc. Rev., 1991, 20, 1, and references therein. 

MAOS is mainly based on the efficient heating of materials by the microwave dielectric heating effect [15] mediated by dipolar polarization and ionic conduction. When irradiated at microwave frequencies, the dipoles (e.g., the polar solvent... 

There is a clear difference between microwave spectroscopy and microwave dielectric heating effects. Thus, in microwave spectroscopy, molecules are examined in the gas phase and the microwave spectrum for a molecule exhibits many sharp bands [15] over the frequency range 3-60 GHz. Such sharp bands arise from transitions between quantized rotational states of the molecules. Microwave spectroscopy provides an excellent fingerprinting method for identifying molecules in a gas phase and has been used, for example, to confirm the presence of a wide range of molecules in outer space. 

MW-enhanced chemistry is based on the efficiency of interactions of molecules with waves by microwave dielectric heating effects. This phenomenon depends on the ability of materials to absorb MW radiation and convert it into heat. The electric component of the electromagnetic field has been shown to be the most important [22-24]. It results in two main mechanisms - dipolar polarization and ionic conduction. Irradiation of polar molecules at MW frequencies results in orientation of the dipoles or ions in the applied electric field (Scheme 4.1) [25]. 

D. M. P. Mingos D. R. Baghurst. Applications of Microwave Dielectric Heating Effects to Synthetic Problems in Chemistry. In Microwave-Enhanced Chemistry, Kingston, H. M., Haswell, S. J. (Eds.), American Chemical Society Washington, DC, 1997. 

MEC is based on microwave dielectric heating effects. This is the ability of any solvent or reagent to absorb microwave energy and to convert it into heat. The electric component of an electromagnetic wave produces heat by two methods ... 

Microwave sterilization is a new method and it plays a significarrt role in synthesis (Honda et al., 1998 Sasaki et al., 1998a). The sterilization is brought about by microwave dielectric heating effect. The efficiency of a microwave sterilizer was... 

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