Mishin M V, Zamotin K Y, Protopopova V S, Alexandrov S E
Department of Physical Chemistry and Technology of Microsystem Devices, Saint Petersburg State Polytechnical University, Polytechnicheskaya st. 29, Saint Petersburg, 195251, Russia.
Phys Chem Chem Phys. 2015 Mar 21;17(11):7138-48. doi: 10.1039/c4cp05904b.
This paper covers the results from a study of the formation mechanism of fractal clusters from nanoparticles synthesised in atmospheric pressure radio frequency discharge. Two-dimensional structures with random configuration and self-similarity properties are formed by nanoparticles on a solid substrate surface. The typical linear dimensions of such structures are in the micron range. On the basis of the previously demonstrated experimental results, a physico-mathematical model of the nanoparticle self-organisation was developed. The physical model includes the electrical charge effect of the deposit surface, the spatial distribution of the surface electrical potential and the topography rearrangement phenomenon under the arising electrostatic forces. The threshold character of the agglomeration process initiation was found. The dependence of the formed structure topography on the character of the electrical potential change was demonstrated. The requisite conditions for the classical fractal formation were revealed. The results from the computational simulation, which was conducted with the use of fractal analysis, indicate a high level of coincidence with the experimental results.
本文涵盖了一项关于在大气压射频放电中合成的纳米颗粒形成分形簇的机制的研究结果。纳米颗粒在固体衬底表面形成具有随机构型和自相似性质的二维结构。此类结构的典型线性尺寸在微米范围内。基于先前展示的实验结果，开发了纳米颗粒自组织的物理数学模型。该物理模型包括沉积物表面的电荷效应、表面电势的空间分布以及在产生的静电力作用下的形貌重排现象。发现了团聚过程起始的阈值特性。证明了所形成结构的形貌对电势变化特性的依赖性。揭示了经典分形形成的必要条件。使用分形分析进行的计算模拟结果表明与实验结果高度吻合。
