Morphology of Amorphous Layers Ballistically Deposited on a Planar Substrate

Details Morphology of Amorphous Layers Ballistically Deposited on a Planar Substrate Morphology of Amorphous Layers Ballistically Deposited on a Planar Substrate

1992-07-15

arxiv.org/abs/cond-mat/9207014v1

Phys.Rev. E47 (1993) 48-53

Physics

Condensed Matter

20 pages, TeX (plain)

Scientific paper

10.1103/PhysRevE.47.48

We report numerical simulation of the deposition of spherical particles on a planar surface, by ballistic, straight-line trajectory transport, and assuming irreversible adhesion on contact with the surface or previously deposited particles. Our data indicate that the deposit formed has a loosely layered structure within few diameters from the surface. This structure can be explained by a model of growth via chain formation. Away from the surface we found evidence of a monotonic, power-law approach to the bulk density. Both density and contact-statistics results suggest that the deposit formed is sparse: the space-filling fraction is about 15%, and the average number of contacts is 2. The morphology of the deposit both near the surface and in the bulk seems to be a result of competition of screening and branching; nearly half of all the spheres are either single-contact dangling ends, or branching nodes with more than two contacts.

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