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Published June 23, 2021 | v1
Journal Article Open

Measurement of Navier Slip on Individual Nanoparticles in Liquid

Abstract

The Navier slip condition describes the motion of a liquid relative to a neighboring solid surface, with its characteristic Navier slip length being a constitutive property of the solid–liquid interface. Measurement of this slip length is complicated by its small magnitude, expected to be in the nanometer range based on molecular simulations. Here, we report an experimental technique that interrogates the Navier slip length on individual nanoparticles immersed in liquid with subnanometer precision. Proof-of-principle experiments on individual, citrate-stabilized, gold nanoparticles in water give a constant slip length of 2.7 ± 0.6 nm (95% C.I.), independent of particle size. Achieving this feature of size independence is central to any measurement of this constitutive property, which is facilitated through the use of individual particles of varying radii. This demonstration motivates studies that can now validate the wealth of existing molecular simulation data on slip.

Copyright and License

© 2021 American Chemical Society.

Acknowledgement

The authors gratefully acknowledge support from an Australian Postgraduate Award, the Australian Research Council Centre of Excellence in Exciton Science (CE170100026), the Australian Research Council Grants Scheme, and the Institute for Collaborative Biotechnologies through grant W911NF-09-0001 from the U.S. Army Research Office. We also thank the Koch Institute Swanson Biotechnology Center for technical support, specifically, The Peterson (1957) Nanotechnology Materials Core Facility for TEM images of gold nanoparticles.

Conflict of Interest

The authors declare the following competing financial interest(s): S.R.M. is a co-founder of Travera and Affnity Biosensors, which develops technologies relevant to the research presented in this work.

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Additional details

Created:
October 9, 2023
Modified:
October 9, 2023