Diffusion- and reaction-limited cluster aggregation revisited
Diffusion- and reaction-limited cluster aggregation revisited
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DOI：
10.1039/c9cp00549h
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发表时间：
2019-03-14
影响因子：
3.3
通讯作者：
Eychmueller, Alexander
中科院分区：
文献类型：
--
作者：
Jungblut, Swetlana;Joswig, Jan-Ole;Eychmueller, Alexander
我们模拟了非相互作用粒子和通过排斥和吸引势相互作用的粒子的不可逆聚集，明确地实现了聚集簇的旋转扩散。我们的研究证实，颗粒之间的吸引力既不影响聚集机制，也不影响聚集体的结构，这与非相互作用颗粒的结构相同。相反，排斥颗粒形成更致密的聚集体，其分形维数和聚集时间随着温度的降低而增加。对非相互作用颗粒的非旋转簇和排斥颗粒的旋转簇获得的分形维数的比较，为先前在忽略旋转扩散的扩散限制簇聚集的完善模型和胶体颗粒实验中获得的各个值的一致性提供了解释。
We simulated irreversible aggregation of non-interacting particles and of particles interacting via repulsive and attractive potentials explicitly implementing the rotational diffusion of aggregating clusters. Our study confirms that the attraction between particles influences neither the aggregation mechanism nor the structure of the aggregates, which are identical to those of non-interacting particles. In contrast, repulsive particles form more compact aggregates and their fractal dimension and aggregation times increase with the decrease of the temperature. A comparison of the fractal dimensions obtained for non-rotating clusters of non-interacting particles and for rotating clusters of repulsive particles provides an explanation for the conformity of the respective values obtained earlier in the well established model of diffusion-limited cluster aggregation neglecting rotational diffusion and in experiments on colloidal particles.