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. 2018 Jul 25;15(144):20180364. doi: 10.1098/rsif.2018.0364

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© 2018 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Schematic of the experimental geometry motivating the sedimentation and diffusion model. (a) Typical experimental geometry for an in vitro cellular association assay. (b) Processes governing nanoparticle transport in a fluid. Red arrows denote the direction of nanoparticle movement due to sedimentation and black arrows highlight the random direction of movement due to diffusion. The length of the arrows highlights the relative contributions of diffusion and sedimentation. (c) Evolution of the distribution of nanoparticles throughout the fluid over time. Orange denotes the presence of nanoparticles and green denotes the cell layer. (Online version in colour.)