title: The effective colloid interaction in the Asakura-Oosawa model. Assessment of non-pairwise terms from the virial expansion.
abstract: The relevance of neglecting three- and four-body interactions in the coarse-grained version of the Asakura-Oosawa model is examined. A mapping between the first few virial coefficients of the binary nonadditive hard-sphere mixture representative of this model and those arising from the coarse-grained (pairwise) depletion potential approximation allows for a quantitative evaluation of the effect of such interactions. This turns out to be especially important for large size ratios and large reservoir polymer packing fractions.
authors.affiliation: Departamento de Física and Instituto de Computación Científica Avanzada (ICCAEx), Universidad de Extremadura, E-06071 Badajoz, Spain.
authors.forename: Andrés
authors.initials: A
authors.lastname: Santos
authors.affiliation: Instituto de Energías Renovables, Universidad Nacional Autónoma de México (U.N.A.M.), Temixco, Morelos 62580, Mexico.
authors.forename: Mariano
authors.initials: M
authors.lastname: López de Haro
authors.affiliation: Department of Mathematics and Computer Science, University of Messina, Viale F. Stagno D'Alcontres 31, I-98166 Messina, Italy.
authors.forename: Giacomo
authors.initials: G
authors.lastname: Fiumara
authors.affiliation: CNR-IPCF, Viale F. Stagno d'Alcontres, 37-98158 Messina, Italy.
authors.forename: Franz
authors.initials: F
authors.lastname: Saija