Definition

Some materials fully reflect MW without heating (conductive material, metal) |
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Some materials are transparent to MW and do not heat.(quartz, Teflon…) |
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Some materials are polarised (molecular agitation) et heat in a MW field |
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Principle
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The heating of a material subjected to a microwave field is caused by the rotation of the polar molecules whose intensity depends on the permittivity ε. |
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Example of the water molecule |
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Other molecules that water have a high permittivity, allowing very efficient heated to very high temperatures (calcination, expansion or vitrification) |
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Example of fresh plant cell (70 to 90% water) or rehydrated (ultrasonic)
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Very efficient and fast extraction |