Low fractal dimension of clusters with repulsive interactions in colloidal aggregation
Low fractal dimension of clusters with repulsive interactions in colloidal aggregation
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DOI：
10.1088/1742-5468/2014/03/p03006
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
A. E. González
中科院分区：
文献类型：
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作者：
A. E. González
胶体聚集的蒙特卡罗模拟表明，随着颗粒间宽度不可忽略的排斥势垒的范围或高度的增加，形成的团簇的分维减小，至少对于不是很大的团簇是这样。这一结果解释了以前的实验结果，即空气-水界面上的二氧化硅胶体形成的具有低分维的2D聚集体，以及最近的实验结果，即当初级粒子的尺寸增大时，各种胶体的团簇在3D中的分维较低。第二种情况是通过分析粒子之间的Derjaguin-Landau-Verwey-Overbeek(DLVO)势来研究的。
Monte Carlo simulations of colloidal aggregation were performed showing that, by increasing the range or the height of a repulsive barrier of non-negligible width between the particles, the fractal dimension of the formed clusters decreases, at least for not very large clusters. This result offers an explanation of old experimental findings of 2D aggregates, with a low fractal dimensionality, made of silica colloids confined on the air–water interface, as well as of very recent experimental results of low fractal dimensionality of clusters of diverse colloids in 3D, when the size of the primary particles is increased. This second case was studied through an analysis of the Derjaguin–Landau–Verwey–Overbeek (DLVO) potential between the particles.