Orientation dynamics of dilute functionalized graphene suspensions in oscillatory flow

Giovanniantonio Natale, Naveen K. Reddy, Robert K. Prud'homme, and Jan Vermant
Phys. Rev. Fluids 3, 063303 – Published 20 June 2018

Abstract

The dynamics of molecularly thin graphene sheets in transient flows are important to understand their behavior in suspension and during processing. Scattering dichroism is used to evaluate changes in the orientation distribution function in dilute suspensions. To evaluate if the graphene sheets behave as flexible sheets or as more rigid flat particles, the results are compared with numerical computations of the single-particle Smoluchowski equation for flat spheroidal particles. In particular, the evolution of the orientation angle in oscillatory flows as a function of increasing amplitude is studied. The results show that even when taking an average rotational diffusivity, the results for the polydisperse graphene sheets show all the hallmarks of the motion of rigid disks, including a frequency doubling of the time-dependent orientation signal. The results indicate that the motion of functionalized graphene sheets in suspension is consistent with flat rigid objects.

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  • Received 12 March 2018

DOI:https://doi.org/10.1103/PhysRevFluids.3.063303

©2018 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsPolymers & Soft MatterStatistical Physics & Thermodynamics

Authors & Affiliations

Giovanniantonio Natale*

  • Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4

Naveen K. Reddy

  • Faculty of Industrial Engineering, Hasselt University, Martelarenlaan 42, 3500 Hasselt, Belgium and IMO, IMOMEC, Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium

Robert K. Prud'homme

  • Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA

Jan Vermant

  • Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, Zürich 8093, Switzerland

  • *gnatale@ucalgary.ca

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Issue

Vol. 3, Iss. 6 — June 2018

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