FRACTAL GEOMETRY OF COLLOIDAL AGGREGATES
FRACTAL GEOMETRY OF COLLOIDAL AGGREGATES
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DOI：
10.1103/physrevlett.52.2371
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发表时间：
1984-01-01
影响因子：
8.6
通讯作者：
CANNELL, DS
中科院分区：
文献类型：
--
作者：
SCHAEFER, DW;MARTIN, JE;CANNELL, DS
报道了小二氧化硅颗粒的胶体聚集体的分形维数 D 的测量。我们通过光和 X 射线散射观察到结构因子 [S (k)∼ k− D] 的幂律衰减，表明聚集体是分形的。 D 为 2.12±0.05，介于扩散限制聚集动力学模型 (D= 2.5) 和簇聚集 (D= 1.75) 的最新数值结果之间，但相当接近平衡结构的晶格动物 (D= 2.0) 的值。
Measurement of the fractal dimension, D, of colloidal aggregates of small silica particles is reported. We observe power-law decay of the structure factor [S (k)∼ k− D] by both light and x-ray scattering showing that the aggregates are fractal. D is found to be 2.12±0.05, which is intermediate between recent numerical results for the kinetic models of diffusion-limited aggregation (D= 2.5) and cluster aggregation (D= 1.75), but is rather close to the value for lattice animals (D= 2.0), which are equilibrium structures.