High Quality Content by WIKIPEDIA articles! Surface conductivity is an additional electric conductivity of fluid in the vicinity of the charged surface. Fluid conductivity is associated with ions motion in electric field. Concentration of ions is higher close to the charged surfaces. They are attracted there by electrostatic forces induced by the surface charge. This layer with higher ions concentration is a part of the interfacial Double Layer. Higher concentration of ions in this layer leads to higher conductivity. Smoluchowski was the first one who recognized importance of the surface conductivity at the beginning of the 20th century. There is detail description of the surface conductivity by Lyklema in "Fundamentals of Interface and Colloid Science". Double Layer has two regions, according to well established Gouy-Chapman-Stern model, Ref.2. The upper level, which is in contact with fluid bulk is diffuse layer. Interior part, that is in contact with interface is Stern layer.

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