Electromagnetic simulations of microwave heating experiments using reaction vessels made out of silicon carbide

Physical Chemistry Chemical Physics : PCCP
John RobinsonC Oliver Kappe

Abstract

There is a growing body of literature which reports the use of silicon carbide vessels to shield reaction mixtures during microwave heating. In this paper we use electromagnetic simulations and microwave experiments to show that silicon carbide vessels do not exclude the electric field, and that dielectric heating of reaction mixtures will take place in addition to heat transfer from the silicon carbide. The contribution of dielectric heating and heat transfer depends on the dielectric properties of the mixture, and the temperature at which the reaction is carried out. Solvents which remain microwave absorbent at high temperatures, such as ionic liquids, will heat under the direct influence of the electric field from 30-250 degrees C. Solvents which are less microwave absorbent at higher temperatures will be heated by heat-transfer only at temperatures in excess of 150 degrees C. The results presented in this paper suggest that the influence of the electric field cannot be neglected when interpreting microwave assisted synthesis experiments in silicon carbide vessels.

References

Nov 24, 2004·Angewandte Chemie·C Oliver Kappe
Jan 27, 2005·Chemical Society Reviews·Antonio de la HozAndrés Moreno
Mar 12, 2009·Journal of Combinatorial Chemistry·Markus Damm, C Oliver Kappe
Apr 22, 2009·Molecular Diversity·C Oliver Kappe, Doris Dallinger
Apr 30, 2010·Physical Chemistry Chemical Physics : PCCP·John RobinsonC Oliver Kappe

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Citations

Aug 19, 2015·Physical Chemistry Chemical Physics : PCCP·Bridgett AshleyGeoffrey F Strouse
Sep 17, 2010·Chemistry : a European Journal·Bernhard GutmannC Oliver Kappe
Dec 1, 2011·Molecular Diversity·C Oliver Kappe, Markus Damm
Nov 19, 2010·The Journal of Organic Chemistry·David Cantillo, C Oliver Kappe
Jul 23, 2014·The Journal of Organic Chemistry·Michael R RosanaGregory B Dudley

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