Explain the terms helmholtz electrical double layer and zeta potential. What are significaoi,ies in the colloidal solutions ?

Explanation

Helmholtz electrical double layer :
The combination of the two layers of opposite charges around the colloidal particle called Helmholtz electrical double layer.
`to` In a colloidal sol the charges of opposite signs on the fixed and diffused parts of t double layer results in a difference in potential between these layers. The potential difference between the fixed layer and the diffused layer of opposite charge is call electro kinetic potential (or) zeta potential.
`to` The above concepts applicable in colloidal solution in which the solid particles carry one kind of charge while liquid medium carries opposite charge to that of solids.