科研之友
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摘要
Efforts are currently under way to produce nanoparticle samples with a size dispersion as low as possible, using deposition of preformed clusters on a substrate. However, even for diluted cluster films, contact or coalescence between neighboring clusters cannot be totally avoided due to the random nature of the deposition process. Consequently, the incident particle-size distribution will necessarily be degraded, with the statistical formation of multimers (dimers, trimers, or more generally nmers). In this article, we consider diluted assemblies of nanoparticles (with a narrow size distribution) randomly deposited on a surface and develop theoretical tools to assess the various multimer proportions. We establish simple and reliable analytical approximations of the probability for a cluster to form an nmer and the subsequent multimer proportion. These results can be applied in the analysis of experimental samples: They constitute a convenient tool for experimentalists in the design of their nanoparticle sample and the interpretation of experimental measurements.
- 出版日期2011-7-25
