Nanofluid Dynamics of Flexible Polymeric Nanoparticles Under Wall Confinement

Author:

Farokhirad Samaneh1,Ramakrishnan N.2,Eckmann David M.3,Ayyaswamy Portonovo S.4,Radhakrishnan Ravi5

Affiliation:

1. Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA 19104 e-mail:

2. Department of Cancer Biology, University of Pennsylvania, Philadelphia, PA 19104 e-mail:

3. Department of Anesthesiology and Critical Care, Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104 e-mail:

4. Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA 19104 e-mail:

5. Department of Chemical and Biomolecular Engineering, Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104 e-mail:

Abstract

Describing the hydrodynamics of nanoparticles in fluid media poses interesting challenges due to the coupling between the Brownian and hydrodynamic forces at the nanoscale. We focus on multiscale formulations of Brownian motion and hydrodynamic interactions (HI) of a single flexible polymeric nanoparticle in confining flows using the Brownian Dynamics method. The nanoparticle is modeled as a self-avoiding freely jointed polymer chain that is subject to Brownian forces, hydrodynamics forces, and repulsive interactions with the confining wall. To accommodate the effect of the wall, the hydrodynamic lift due to the wall is included in the mobility of a bead of the polymer chain which depends on its proximity to the wall. Using the example of a flexible polymeric nanoparticle, we illustrate temporal dynamics pertaining to the colloidal scale as well as the nanoscale.

Funder

National Cancer Institute

National Institute of Biomedical Imaging and Bioengineering

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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