Title: Structure and dynamics of hydrodynamically interacting finite-size Brownian particles in a spherical cavity: Spheres and cylinders

Abstract

The structure and dynamics of confined suspensions of particles of arbitrary shape are of interest in multiple disciplines from biology to engineering. Theoretical studies are often limited by the complexity of long-range particle-particle and particle-wall forces, including many-body fluctuating hydrodynamic interactions. Here, we report a computational study on the diffusion of spherical and cylindrical particles confined in a spherical cavity. We rely on an immersed-boundary general geometry Ewald-like method to capture lubrication and long-range hydrodynamics and include appropriate non-slip conditions at the confining walls. A Chebyshev polynomial approximation is used to satisfy the fluctuation-dissipation theorem for the Brownian suspension. We explore how lubrication, long-range hydrodynamics, particle volume fraction, and shape affect the equilibrium structure and the diffusion of the particles. It is found that once the particle volume fraction is greater than 10%, the particles start to form layered aggregates that greatly influence particle dynamics. Hydrodynamic interactions strongly influence the particle diffusion by inducing spatially dependent short-time diffusion coefficients, stronger wall effects on the particle diffusion toward the walls, and a sub-diffusive regime-caused by crowding-in the long-time particle mobility. The level of asymmetry of the cylindrical particles considered here is enough to induce an orientational order in the layered structure,more » decreasing the diffusion rate and facilitating a transition to the crowded mobility regime at low particle concentrations. Our results offer fundamental insights into the diffusion and distribution of globular and fibrillar proteins inside cells.« less

Authors:

Li, Jiyuan  ^[1];

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Jiang, Xikai  ^[2];

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Singh, Abhinendra  ^[1];

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Heinonen, Olle G.  ^[3];

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Hernández-Ortiz, Juan P.  ^[4];

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• Search DOE PAGES for ORCID "0000-0003-0404-9947"
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de Pablo, Juan J.  ^[5]

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• Search DOE PAGES for ORCID "0000-0002-3526-516X"
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+ Show Author Affiliations

1. Univ. of Chicago, IL (United States)
2. Univ. of Chicago, IL (United States); Chinese Academy of Sciences (CAS), Beijing (China)
3. Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern-Argonne Inst. for Science and Engineering, Evanston, IL (United States)
4. Univ. of Chicago, IL (United States); National Univ. of Colombia (Colombia)
5. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)

Publication Date:

2020-05-27

Research Org.:

Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

OSTI Identifier:

1634189

Alternate Identifier(s):

OSTI ID: 1630954

Grant/Contract Number:  

AC02-06CH11357

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Chemical Physics

Additional Journal Information:

Journal Volume: 152; Journal Issue: 20; Journal ID: ISSN 0021-9606

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE