Shape and scale dependent diffusivity of colloidal nanoclusters and aggregates

M. M T Alcanzare*, S. T. T. Ollila, V. Thakore, A. M. Laganapan, A. Videcoq, M. Cerbelaud, R. Ferrando, Tapio Ala-Nissilä

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The diffusion of colloidal nanoparticles and nanomolecular aggregates, which plays an important role in various biophysical and physicochemical phenomena, is currently under intense study. Here, we examine the shape and size dependent diffusion of colloidal nano- particles, fused nanoclusters and nanoaggregates using a hybrid fluctuating lattice Boltzmann-Molecular Dynamics method. We use physically realistic parameters characteristic of an aqueous solution, with explicitly implemented microscopic no-slip and full-slip boundary conditions. Results from nanocolloids below 10 nm in radii demonstrate how the volume fraction of the hydrodynamic boundary layer influences diffusivities. Full-slip colloids are found to diffuse faster than no-slip particles. We also characterize the shape dependent anisotropy of the diffusion coefficients of nanoclusters through the Green-Kubo relation. Finally, we study the size dependence of the diffusion of nanoaggregates comprising N ≤ 108 monomers and demonstrate that the diffusion coefficient approaches the continuum scaling limit of N−1/3.

Original languageEnglish
Pages (from-to)729-739
Number of pages11
JournalEUROPEAN PHYSICAL JOURNAL: SPECIAL TOPICS
Volume225
Issue number4
DOIs
Publication statusPublished - 1 Jul 2016
MoE publication typeA1 Journal article-refereed

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