# Fred Lado

## Bio

Professor Lado received his PhD degree in 1964 from the University of Florida with a dissertation on liquid state theory directed by Professor Arthur A. Broyles. After some additional postdoctoral work with Professor Broyles’ group in Gainesville, in 1965 he joined the pioneering research group of William W. Wood at the Los Alamos Scientific Laboratory, which was developing large-scale Monte Carlo simulations of liquids made possible by the excellent computer facilities at LASL. He joined the faculty of North Carolina State University as Assistant Professor in 1968.

## Area(s) of Expertise

At NCSU he continued work in the theory of liquids, but shifted focus from large numerical simulations to the semi-analytic alternative of nonlinear integral equations. These have the advantage of greatly reduced computing needs, obtained however at the cost of some approximation. He developed a particular approximation known as the Reference-Hypernetted Chain (RHNC) equation, which currently affords one of the more exact routes to liquid state properties from the analytic (*i.e.*, nonsimulation) side. In general, his work shows particular concern with novel numerical analysis techniques, including numerical Hankel transforms for systems in two dimensions and speciallydesigned orthogonal polynomials for nonuniform fluids in external fields. During his years at NCSU he taught a wide selection of the courses offered by the Physics Department to both graduates and undergraduates.

## Publications

- From square-well to Janus: Improved algorithm for integral equation theory and comparison with thermodynamic perturbation theory within the Kern-Frenkel model , Journal of Chemical Physics (2014)
- Effects of patch size and number within a simple model of patchy colloids , Journal of Chemical Physics (2010)
- An efficient procedure for the study of inhomogeneous liquids , Molecular Physics (2009)
- Liquid-vapor coexistence in square-well fluids: An RHNC study , Molecular Physics (2009)
- Phase diagram and structural properties of a simple model for one-patch particles , Journal of Chemical Physics (2009)
- Integral equation procedure based on tailored orthogonal functions for the XY spin fluid in an external magnetic field , Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (2007)
- Structure and thermodynamics of a two-dimensional Coulomb fluid in the strong association regime , Journal of Chemical Physics (2007)
- Phase behavior of a hard sphere Maier-Saupe nematogenic system in three dimensions , Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics (2006)
- Integral equation and simulation studies of a planar nematogenic liquid in crossed external fields , Journal of Physics. Condensed Matter (2005)
- Integral equation theory for two-dimensional polymer melts , Journal of Chemical Physics (2005)

### Groups

Honors and Awards

- His 1964 doctoral dissertation won the Sigma Xi Research Award at the University of Florida. At NCSU he was selected for an Outstanding Teacher Award and recognized by the D.H. Hill Library for an “NC State Citation Classic.” He was a Senior Fulbright Scholar at the Universidad de Santiago, Spain, and a Visiting Scientist at the International Centre for Theoretical Physics in Trieste, Italy, and the Instituto de Química Física Rocasolano in Madrid, Spain.