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MORE synthesis stands for ''Microwave-organic Reaction Enhancement''. HEATING EFFECT See Also: microwave effect See Also: non-thermal microwave effect Conventional heating usually involves the use of a furnace or oil bath, which heats the walls of the reactor by convection or conduction. The core of the sample takes much longer to achieve the target temperature, e.g. when heating a large sample of ceramic bricks. Microwave heating is able to heat the target compounds without heating the entire furnace or oil bath, which saves time and energy. It is also able to heat an object throughout the volume (instead of through its outer surface), in theory producing more uniform heating. However, due to the design of most microwave ovens and to absorption by the object being heated, the microwave field is usually non-uniform and localized Superheating occurs. Some compounds absorb microwave radiation differently than others. This selectivity allows some parts of the object being heated to heat more quickly or more slowly than surrounding parts. Microwave heating can have certain benefits over conventional ovens:
SELECTIVE HEATING A heterogeneous system (composed by different substances or different phases) is system comprising a Polar solvent and an apolar solvent obtain different temperatures. Applied in a Phase Transfer Reaction a water phase reaches a temperature of 100°C while a Chloroform phase would retain a temperature of 50°C, providing the Extraction as well of the reactants from one phase to the other Microwave chemistry is particularly effective in Dry Media Reaction s. REFERENCES |
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