Microscopic model of diffusion limited aggregation and electrodeposition in the presence of leveling molecules
Microscopic model of diffusion limited aggregation and electrodeposition in the presence of leveling molecules
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DOI：
10.1103/physreve.73.011606
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发表时间：
2006-01-01
影响因子：
2.4
通讯作者：
Tweedie, ES
中科院分区：
文献类型：
--
作者：
Ackland, GJ;Tweedie, ES
我们提出了一个细胞自动机方法的微观建模的影响，扩散限制聚集的解约束。自动机代表活跃的粒子，这些粒子能够改变它们的内部状态并影响它们的邻居。其几何形状类似于电化学沉积--“离子”从容器的顶部随机扩散，直到遇到与底部接触的聚集体，并粘在其上。该模型表现出枝晶（分形）生长的扩散限制的情况下。场的添加消除了分形性质，但密度仍然很低。添加分子将原子从聚集体中分离出来，将存款转变为100%致密的（三维）。这些分子非常善于避免被捕获。这模拟了在电化学沉积中使用的所谓整平剂分子的效果。
We present a cellular automata approach for microscopic modeling of the effect of unbinding in diffusion limited aggregation. The automata represent active particles, which are able to change their internal state and affect their neighbors. The geometry resembles electrochemical deposition-"ions" diffuse at random from the top of a container until encountering an aggregate in contact with the bottom, to which they stick. This 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 that unbind atoms from the aggregate transforms the deposit to a 100% dense one (in three dimensions). The molecules are remarkably adept at avoiding being trapped. This mimics the effect of so-called leveler molecules which are used in electrochemical deposition.