In chemistry, adsorption of a substance is its concentration on a particular surface. The result is the formation of a liquid or gas film on the surface of a solid body.
Consider a clean surface exposed to a gaseous atmosphere. In the bulk material, all the bonding requirements (be they ionic, covalent or metallic) of the constituent atoms of the material are filled. However, by definition, the surface represents a disruption of these bonds. It is then energetically favourable for these dangling bonds to react with whatever happens to be available. The exact nature of the bonding depends on the details of the species involved, but the adsorbed material is generally classed as being either physisorbed or chemisorbed.
The simplest form of adsorption, physisorption, is due to weak forces of attraction, typically Van der Waals forces (see dispersion forces). As these forces are ubiquitous, it follows that any clean exposed surface will rapidly accumulate a layer of physisorbed material.
Chemisorption occurs when a chemical bond, defined in this case as an exchange of electrons, is formed. The degree of exchange, and how symmetric the exchange is, depends on the materials involved. There is often a close parallel with the situation encountered in coordination chemistry. Chemisorption is particularly important in heterogeneous catalysis, the most commonly encountered kind in industry, where a solid catalyst interacts with a gaseous feedstock, the reactant/s. The adsorption of reactant/s to the catalyst surface creates a chemical bond, altering the electron density around the reactant molecule and allowing it to undergo reactions that would not normally be available to it.
The amount of material which accumulates depends on the dynamic equilibrium which is achieved between the rate at which material adsorbs to the surface and the rate at which it evaporates. The higher the rate of adsorption and the lower the rate of desorption, the greater the fraction of the available surface which will be covered by adsorbed material at equilibrium.
This mini dehumidifier will adsorb more thentwice as much moisture then its sister unit.Using the same water glass technology, theEva-Dry 500 will hold about 10 oz of moisture.Use in larger areas up to 100 cubic feet.
This high capacity renewable dehumidifier has been designed to adsorb moisture from small, enclosed areas.
Just hang the Eva-dry unit in a closet, or you can place it in other small, enclosed spaces, and it will start to adsorb moisture.
Simply remove the unit from where it is adsorbing moisture and plug it into a power outlet or power strip in a well ventilated area (bathroom with extraction fan, garage, outside, etc.).
Simply remove the unit from where it is adsorbing moisture and plug it into a power outlet in a well ventilated area (bathroom with extraction fan, garage, outside, etc.).
The unit is brand new again and ready to adsorb another 8 to 10 ounces of moisture.
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