一次粒子密度对团聚体形貌的影响
Influence of primary particle density in the morphology of agglomerates
摘要：
凝聚过程发生在许多不同的科学领域，如胶体和气溶胶的形成或细菌菌落的形成。我们通过不同的制度（DLA和DLCA），使用扩散控制的蒙特卡罗模拟与现实的空间尺度的团聚体结构中的初级粒子密度的影响进行了研究。由Hirsch的布朗运动流体力学理论给出了MonteCarlo时间步长与真实时间尺度的等价性。不同时间段的团聚体行为表明，三个指标（分形指数，配位数和偏心率指数）表征团聚体的几何形状。使用这些指标，我们已经发现，初级粒子的初始密度极大地影响了在最近的实验工作中观察到的团聚体的最终结构。
英文摘要：
Agglomeration processes occur in many different realms of science such as colloid and aerosol formation or formation of bacterial colonies. We study the influence of primary particle density in agglomerate structure using diffusion-controlled Monte Carlo simulations with realistic space scales through different regimes (DLA and DLCA). The equivalence of Monte Carlo time steps to real time scales is given by Hirsch's hydrodynamical theory of Brownian motion. Agglomerate behavior at different time stages of the simulations suggests that three indices (fractal exponent, coordination number and eccentricity index) characterize agglomerate geometry. Using these indices, we have found that the initial density of primary particles greatly influences the final structure of the agglomerate as observed in recent experimental works.
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