Abstract
As a rule, electrical double layers develop at the phase boundary between dispersed insoluble oxides and the liquid medium in which they are embedded. Such double layers can be characterized by their surface charge, which is a measurable quantity. This surface charge can be determined as a function of the pH (for oxides), the pAg (for silver halides) or by corresponding quantities for other systems. The relation between the surface charge and the pH (etc. ) also depends on the extent of screening. Hence, uncharged or charged adsorbates exert their influence, and from the ensuing changes information can be obtained regarding these adsorates. Principles and consequences of these phenomena will be discussed.
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