Interaction Between Particles Through Water
The DLVO theory is a quantitative description of interaction of clay particles. The basic concepts are the mutual repulsion due to the interaction of overlapping electric double layers and the attraction due to the London-van der Waals forces. It is important to understand whether the particles under consideration satisfy the condition of constant surface potential or constant surface charge before integrating. The jumps suggest the breakdown of continuum theories such as electrostatic double-layer forces and van der Waals forces. Ions and water molecules existing in the interlayer cannot be regarded as solution, they must be treated as discrete ions and water molecules with definite sizes. To obtain a total potential energy for allophane, it is necessary to know the shape and size of the allophane particle, its surface charge density, and the Hamaker constant for allophane/water/allophane.