线状凝聚核聚集生长的模拟与实验研究

Simulation and Experimental Study of Linear Aggregation Nuclear

关键词:  凝聚核  聚集生长  粒子  随机运动

Key words:  aggregations nuclear  aggregate growth  particles  random walk

摘要:

在传统二维DLA模型的基础上提出一个线状凝聚核聚集生长模型,利用该模型对线状凝聚核聚集生长过程进行计算机模拟,同时利用电解沉积金属锌的方法进行相应的电化学沉积实验研究,最后通过计算凝聚物的分形维数对模拟和实验结果进行验证。模拟结果显示,线状凝聚物的生长区域主要位于凝聚核尖端位置的邻近区域,凝聚核每一尖端部分引起的生长类似于一个点凝聚核的生长情况;相应实验得到的电沉积物的整体形态与模拟结果十分类似。凝聚核的形状不但影响凝聚物树枝的分布结构与形态,还影响凝聚物的分形维数。

Abstract:

Base on the traditional two-dimensional DLA model, this paper developes a linear aggregation nuclear aggregation growth model.We use this model to simulate the aggregation growth process of linear aggregtaion nuclears.At the same time, based on the simulation, we use the way of electro-deposition of zinc metal to carried out the corresponding experimental study.The results showed that the growth region of aggregation are mainly located in the adjacent region of the cutting-edge part of the aggregation nuclear, the growth caused by the each cutting-edge part of aggregation nuclear is similar to the growth of a point aggregation nuclear.In addition, although the physical mechanism of electric aggregation formation is different to the computer simulation, but corresponding electricity aggregation's pattern is still very similar to simulation results.The results also showed that the shape of the aggregatio nuclear not only affected the distribution of aggregates branch structure and form, but also affect the aggregates fractal dimension.