Fig. 1
From: Effect of pH on the surface charges of permanently/variably charged soils and clay minerals

The variation in the 2s2p orbitals of the surface O atoms of charged clay minerals in an electric field.
From: Effect of pH on the surface charges of permanently/variably charged soils and clay minerals

The variation in the 2s2p orbitals of the surface O atoms of charged clay minerals in an electric field.