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Electric surface charge
Electric surface charge appears practically always on an object surface when it is placed into a fluid. All fluids contain ions, positive (cations) and negative (anions). These ions interact with the object surface. This interaction might lead to adsorption some of them on the surface. If number of adsorbed cations exceeds number of adsorbed anions, surface would gain total positive electric charge.
Additional recommended knowledge
There is another possible mechanism leading to surface charging. It is dissociation of the surface chemical group.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Electric_surface_charge". A list of authors is available in Wikipedia.|