title: Interplay of model ingredients affecting aggregate shape plasticity in diffusion-limited aggregation.
abstract: We analyze the combined effect of three ingredients of an aggregation model--surface tension, particle flow and particle source--representing typical characteristics of many aggregation growth processes in nature. Through extensive numerical experiments and for different underlying lattice structures we demonstrate that the location of incoming particles and their preferential direction of flow can significantly affect the resulting general shape of the aggregate, while the surface tension controls the surface roughness. Combining all three ingredients increases the aggregate shape plasticity, yielding a wider spectrum of shapes as compared to earlier works that analyzed these ingredients separately. Our results indicate that the considered combination of effects is fundamental for modeling the polymorphic growth of a wide variety of structures in confined geometries and/or in the presence of external fields, such as rocks, crystals, corals, and biominerals.
authors.affiliation: Departamento de Estatística e Informática, Universidade Federal Rural de Pernambuco, 52171-900 Recife, Brazil and Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium.
authors.forename: P
authors.initials: P
authors.lastname: Duarte-Neto
authors.affiliation: Departamento de Estatística e Informática, Universidade Federal Rural de Pernambuco, 52171-900 Recife, Brazil.
authors.forename: T
authors.initials: T
authors.lastname: Stošić
authors.affiliation: Departamento de Estatística e Informática, Universidade Federal Rural de Pernambuco, 52171-900 Recife, Brazil.
authors.forename: B
authors.initials: B
authors.lastname: Stošić
authors.affiliation: Departamento de Pesca e Aquicultura, Universidade Federal Rural de Pernambuco, 52171-900 Recife, Brazil.
authors.forename: R
authors.initials: R
authors.lastname: Lessa
authors.affiliation: Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium and Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, Campus do Pici, 60455-900 Fortaleza, Ceará, Brazil.
authors.forename: M V
authors.initials: MV
authors.lastname: Milošević
mesh_terms: D001688:Biological Products / Q000737:chemistry; D004058:Diffusion; D008958:Models, Molecular; D008968:Molecular Conformation; D013500:Surface Tension
chemical_list: D001688:Biological Products