1still now no one???
WOW!!
in case of positive adsorption there are unbalanced forces on the surface which causes the phenomenon but why does negative adsorption take place?
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5 Answers
71http://en.wikipedia.org/wiki/Desorption
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1For liquids, accumulation (positive adsorption) of one or several components is generally accompanied by depletion of the other(s) in the interfacial layer; such depletion, i.e. when the equilibrium concentration of a component in the interfacial layer is smaller than the adjoining bulk liquid, is termed negative adsorption and should not be designated as desorption. Negative adsorption may occur also in the case of adsorption from highly compressed gas mixtures.
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Has Negetive Adsorption anything to do with adsorption of solvent molecules???
11why does negative adsorption take place?
In some cases, the solvent from the solution may be adsorbed by the adsorbent so that the
concentration of the solution increases than the initial concentration. This is called negative
adsorption. Hence if the concentration of the adsorbate is less on the surface of the
adsorbent than in the bulk, it is known as negative adsorption
For liquids, accumulation (positive adsorption) of one or several components is generally
accompanied by depletion of the other(s) in the interfacial layer; such depletion, i.e. when
the equilibrium concentration of a component in the interfacial layer is smaller than the
adjoining bulk liquid, is termed negative adsorption and should not be designated as
desorption. Negative adsorption may occur also in the case of adsorption from highly
compressed gas mixtures.