Seager Clair R, Mason Thomas G
Department of Physics and Astronomy, University of California-Los Angeles, Los Angeles, California 90095, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2007 Jan;75(1 Pt 1):011406. doi: 10.1103/PhysRevE.75.011406. Epub 2007 Jan 18.
Colloidal particles that interact through strong, short-range, secondary attractions in liquids form irreversible "slippery" bonds that are not shear-rigid. Through event-driven simulations of slippery attractive spheres, we show that space-filling fractal clusters still emerge from the process of "slippery" diffusion-limited aggregation (DLA). Although slippery and classic DLA clusters have the same fractal dimension, d_{f}=2.5 , their average coordination numbers are quite different: z_{S}=6 whereas z_{C}=2 . Local tetrahedral attractive jamming of the particles leads to a structure factor, S(q) , that exhibits dense cluster peaks at higher wave numbers, q , and a fractal power-law rise toward lower q .
在液体中通过强的、短程的二级吸引力相互作用的胶体颗粒形成不可逆的“滑”键，这些键不是抗剪切刚性的。通过对滑吸引球体的事件驱动模拟，我们表明，空间填充分形簇仍然会从“滑”扩散限制聚集（DLA）过程中出现。尽管滑DLA簇和经典DLA簇具有相同的分形维数，df = 2.5，但它们的平均配位数却大不相同：zS = 6，而zC = 2。颗粒的局部四面体吸引性堵塞导致一个结构因子S(q)，该结构因子在较高波数q处表现出密集簇峰，并且朝着较低q呈分形幂律上升。
