title: Elastic response of binary hard-sphere fluids.
abstract: We derive expressions for the high-frequency, wave-number-dependent elastic constants of a binary hard-sphere fluid and employ Monte Carlo computer simulation to evaluate these constants in order to highlight the impact of composition and relative sphere diameter on the elastic response of this system. It is found that the elastic constant c(11)(k) exhibits oscillatory behavior as a function of k whereas the high-frequency shear modulus, for example, does not. This behavior is shown to be dictated by the angular dependence (in k[over ⃗] space) of derivatives of the interatomic force at contact. The results are related to recent measurements of the compressibility of colloidal fluids in laser trapping experiments.
authors.affiliation: Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Rickman
authors.forename: H Daniel
authors.initials: HD
authors.lastname: Ou-Yang
mesh_terms: D003198:Computer Simulation; D004548:Elasticity; D007834:Lasers; D015233:Models, Statistical; D009010:Monte Carlo Method; D009991:Oscillometry / Q000379:methods*; D010316:Particle Size; D010825:Physics / Q000379:methods*