Fundamental theoretical study of nanoscale ion transport through charged porous rocks: Part i - Diffusion

Abstract

Understanding of diffusive mass transport through porous rocks is essential for many applications in geomechanics and environmental engineering (e.g., the assessment of contaminant transport through porous rocks or the development of ore deposits). Such systems are generally characterized by aqueous solutions containing multiple ions filling the pore space of the porous material. However, the surfaces of the porous rock may be charged leading to anion/cation exclusion depending on the charge of the ion transported through the solution. In this paper, the fundamental equations describing coupled multi-ion diffusion and migration through charged porous rocks are given for ideal solution system..