Microscopic model of diffusion limited aggregation and electrodeposition in the presence of levelling molecules

Details Microscopic model of diffusion limited aggregation and electrodeposition in the presence of levelling molecules Microscopic model of diffusion limited aggregation and electrodeposition in the presence of levelling molecules

2005-08-29

arxiv.org/abs/cond-mat/0508675v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevE.73.011606

A microscopic model of the effect of unbinding in diffusion limited aggregation based on a cellular automata approach is presented. The geometry resembles electrochemical deposition - ``ions'' diffuse at random from the top of a container until encountering a cluster in contact with the bottom, to which they stick. The model exhibits dendritic (fractal) growth in the diffusion limited case. The addition of a field eliminates the fractal nature but the density remains low. The addition of molecules which unbind atoms from the aggregate transforms the deposit to a 100% dense one (in 3D). The molecules are remarkably adept at avoiding being trapped. This mimics the effect of so-called ``leveller'' molecules which are used in electrochemical deposition.

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