title: Two-dimensional colloidal alloys.
abstract: We study the structure of mixed monolayers of large (3 μm diameter) and small (1 μm diameter) very hydrophobic silica particles at an octane-water interface as a function of the number fraction of small particles ξ. We find that a rich variety of two-dimensional hexagonal super-lattices of large (A) and small (B) particles can be obtained in this system due to strong and long-range electrostatic repulsions through the nonpolar octane phase. The structures obtained for the different compositions are in good agreement with zero temperature calculations and finite temperature computer simulations.
authors.affiliation: Surfactant & Colloid Group, Department of Physics, University of Hull, Hull HU6 7RX, United Kingdom.
authors.forename: Adam D
authors.initials: AD
authors.lastname: Law
authors.forename: D Martin A
authors.initials: DM
authors.lastname: Buzza
authors.forename: Tommy S
authors.initials: TS
authors.lastname: Horozov