title: Description of the fluctuating colloid-polymer interface.
abstract: To describe the full spectrum of surface fluctuations of the interface between phase-separated colloid-polymer mixtures from low scattering vector q (classical capillary wave theory) to high q (bulklike fluctuations), one must take account of the interface's bending rigidity. We find that the bending rigidity is negative and that on approach to the critical point it vanishes proportionally to the interfacial tension. Both features are in agreement with Monte Carlo simulations.
authors.affiliation: Colloid and Interface Science, Leiden Institute of Chemistry, Gorlaeus Laboratories, P.O. Box 9502, 2300 RA Leiden, The Netherlands.
authors.forename: Edgar M
authors.initials: EM
authors.lastname: Blokhuis
authors.forename: Joris
authors.initials: J
authors.lastname: Kuipers
authors.forename: Richard L C
authors.initials: RL
authors.lastname: Vink