Structure of a three-dimensional nano-powder subjected to repeated fragmentation and sedimentation
Structure of a three-dimensional nano-powder subjected to repeated fragmentation and sedimentation
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DOI：
10.1088/1367-2630/17/1/013024
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发表时间：
2015
影响因子：
3.3
通讯作者：
N. Topic;A. Weuster;T. Pöschel;D. Wolf
中科院分区：
文献类型：
--
作者：
N. Topic;A. Weuster;T. Pöschel;D. Wolf
我们重新审视的纳米粉末的结构进行反复破碎和沉降的问题，并扩展到更相关的三维（3D）的情况下的分析。一个重要的问题是以前没有解决的分形维数和尘埃指数如何依赖于空间维数。我们发现纳米粉体在三维空间中的定性行为与在二维空间中的定性行为相似。但分形维数从1.6 ± 0.1？>在两个维度上达到2.1 ± 0.1？>在三维空间中。分形维数与表征粒度分布的尘埃指数之间的标度关系与二维情况相同。这些指数的普遍性是通过与一个更简单的晶格模型的结果进行比较来解决的。虽然不同的沉降动力学的碎片导致不同的各向异性，分形特性不受影响。
We revisit the problem of the structure of a nano-powder subjected to repeated fragmentation and sedimentation, and extend the analysis to the more relevant three-dimensional (3D) case. One important question not addressed previously is how the fractal dimension and dust exponent depend on space dimension. We find that the qualitative behavior of the nano-powder in three dimensions is similar to that in two dimensions. But the fractal dimension changes from 1.6 ± 0.1 ?> in two dimensions to 2.1 ± 0.1 ?> in three dimensions. The scaling relation between the fractal dimension and the dust exponent characterizing the fragment size distribution is the same as in two dimensions. The universality of these exponents is addressed by comparing the results with a much simpler lattice model. Although the different settling kinetics of the fragments leads to different anisotropies, the fractal properties are not affected.