title: Colloid-polymer mixtures under slit confinement.
abstract: We report a NVT molecular dynamic study of colloid-polymer mixtures under slit confinement. For this purpose, we are employing the Asakura-Oosawa model for studying colloidal particles, polymer coils, and hard walls as the external confining field. The colloid-polymer size ratio, q, is varied in the range 1⩾q⩾0.4 and the confinement distance, H, in 10σc⩾H⩾3σc, σcbeing the colloidal diameter. Vapor-liquid coexistence properties are assessed, from which phase diagrams are built. The obtained data fulfill the corresponding states law for a constant H when q is varied. The shift of the polymer and colloidal chemical potentials of coexistence follows a linear relationship with (H-σc)-1for H≳4σc. The confined vapor-liquid interfaces can be fitted with a semicircular line of curvature (H-σc)-1, from which the contact angle can be obtained. We observe complete wetting of the confining walls for reservoir polymer concentrations above and close to the critical value, and partial wetting for reservoir polymer concentrations above and far from it.
authors.affiliation: Área de Física de Procesos Irreversibles, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, Ave. San Pablo 180 Col. Reynosa, Ciudad de México 02200, Mexico.
authors.forename: Allan
authors.identifier: 0000000336043603
authors.initials: A
authors.lastname: Pérez-Ramírez
authors.affiliation: Departamento de Ingenierías Química, Electrónica y Biomédica, División de Ciencias e Ingenierías, Universidad de Guanajuato, Campus León, Loma del Bosque 103, León 37150, Guanajuato, Mexico.
authors.forename: Susana
authors.identifier: 0000000309211165
authors.initials: S
authors.lastname: Figueroa-Gerstenmaier
authors.affiliation: Área de Física de Procesos Irreversibles, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana, Ave. San Pablo 180 Col. Reynosa, Ciudad de México 02200, Mexico.
authors.forename: Gerardo
authors.identifier: 0000000200932129
authors.initials: G
authors.lastname: Odriozola