Classical DFT of Ions in the Electrical Double Layer and Nanofluidics

Compared to DFTs of short-range interactions (e.g., hard spheres), the long-range Coulombic interaction poses a special problem for developing classical density functional theory for ions and electrolytes. Over the last 25 years, significant progress has been made on more accurate DFTs for Coulombic systems. Recent progress in such DFTs will be reviewed. Applications of DFTs of electrolytes to the equilibrium electrical double layer (including 2D DFT calculations of a heterogeneous surface charge) and in the transport of ions in nanofluidic systems will be discussed.