GouyChapmanModell
The Gouy-Chapman model, also known as the Gouy-Chapman-Stern model when referring to its more developed form, describes the structure of the electrical double layer at the interface between a charged surface and an electrolyte solution. Developed independently by Georges Gouy and David Chapman in the early 20th century, it provides a theoretical framework for understanding how ions in a solution arrange themselves in response to a charged electrode or colloid.
The core concept is that a charged surface in contact with an electrolyte will attract counterions (ions
The Gouy-Chapman model predicts that the thickness of this diffuse layer is dependent on the ionic strength