title: Freezing lines of colloidal Yukawa spheres. I. A Rogers-Young integral equation study.
abstract: Using the Rogers-Young (RY) integral equation scheme for the static structure factor combined with the one-phase Hansen-Verlet (HV) freezing rule, we study the equilibrium structure and two-parameter freezing lines of colloidal particles with Yukawa-type pair interactions representing charge-stabilized silica spheres suspended in dimethylformamide (DMF). Results are presented for a vast range of concentrations, salinities and effective charges covering particles with masked excluded-volume interactions. The freezing lines were obtained for the low-charge and high-charge solutions of the static structure factor, for various two-parameter sets of experimentally accessible system parameters. All RY-HV based freezing lines can be mapped on a universal fluid-solid coexistence line in good agreement with computer simulation predictions. The RY-HV calculations extend the freezing lines obtained in earlier simulations to a broader parameter range. The experimentally observed fluid-bcc-fluid reentrant transition of charged silica spheres in DMF can be explained using the freezing lines obtained in this work.
authors.affiliation: Faculty of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland. gapinski@amu.edu.pl
authors.forename: Jacek
authors.initials: J
authors.lastname: Gapinski
authors.forename: Gerhard
authors.initials: G
authors.lastname: Nägele
authors.forename: Adam
authors.initials: A
authors.lastname: Patkowski
mesh_terms: D000465:Algorithms; D003102:Colloids / Q000737:chemistry; D003198:Computer Simulation; D004126:Dimethylformamide / Q000737:chemistry*; D005615:Freezing; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D003102:Colloids; D012822:Silicon Dioxide; D004126:Dimethylformamide