desorption
desorption
English Definitions:
desorption (noun)
changing from an adsorbed state on a surface to a gaseous or liquid state
desorption (Noun)
The process in which atomic or molecular species leave the surface of a solid and escape into the surroundings; the reverse of absorption or adsorption
Desorption
Desorption is a phenomenon whereby a substance is released from or through a surface. The process is the opposite of sorption. This occurs in a system being in the state of sorption equilibrium between bulk phase and an adsorbing surface. When the concentration of substance in the bulk phase is lowered, some of the sorbed substance changes to the bulk state. In chemistry, especially chromatography, desorption is the ability for a chemical to move with the mobile phase. The more a chemical desorbs, the less likely it will adsorb, thus instead of sticking to the stationary phase, the chemical moves up with the solvent front. In chemical separation processes, stripping is also referred to as desorption as one component of a liquid stream moves by mass transfer into a vapor phase through the liquid-vapor interface. After adsorption, the adsorbed chemical will remain on the substrate nearly indefinitely, provided the temperature remains low. However,as the temperature rises, so does the likelihood of desorption occurring. The general equation for the rate of desorption is:
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