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Diffusion transport of nanoparticles at nanochannel boundaries

  • T. S. Mahadevan
  • M. Milosevic
  • M. Kojic
  • F. Hussain
  • N. Kojic
  • R. Serda
  • M. Ferrari
  • A. ZiemysEmail author
Research Paper

Abstract

The manipulation of matter at the nanoscale has unleashed a great potential for engineering biomedical drug carriers, but the transport of nanoparticles (NPs) under nanoscale confinement is still poorly understood. Using colloidal physics to describe NP interactions, we have computationally studied the passive transport of NPs using experimentally relevant conditions from bulk into a nanochannel of 60–90 nm height. NP size, channel height, and the Debye length are comparable so that changes in nanoscale dimensions may induce substantial changes in NP transport kinetics. We show that subtle changes in nanochannel dimensions may alter the energy barrier by about six orders of magnitude resulting in different NP penetration depths and diffusion mechanisms: ballistic, first-order and quasi zero-order transport regimes. The analysis of NP diffusion by continuum methods reveals that apparent diffusivity is reduced by decreasing channel size. The continuum finite element (FE) numerical method reproduced the colloidal model results only when surface interactions were accounted for. These results give a new insight into NP passive transport at the boundaries of nanoconfined domains, and have implications on the design of nanoscale fluidics and NP systems for biomedical and engineering applications.

Keywords

Nanoparticle Nanochannel Diffusion Transport Barrier 

Notes

Acknowledgments

The authors acknowledge the Texas Advanced Computing Center (TACC) at The University of Texas at Austin for providing HPC resources that have contributed to the research results reported within this paper. This project has been partially supported with the Methodist Research Institute, and also by the Grant OI 174028 of the Serbian Ministry of Education and Science. Authors also acknowledge partial supports from the following funding sources: the Ernest Cockrell Jr. Distinguished Endowed Chair (M.F.), US Department of Defense (W81XWH-09-1-0212) (M.F.), National Institute of Health (U54CA143837, U54CA151668) (M.F.).

Conflict of interest

The author M.F. serves on the Board of Directors of NanoMedical Systems, Inc., ArrowHead Research Corporation and Leonardo Biosystems, and discloses potential financial interest in the companies. All other authors declare no competing financial interests.

Supplementary material

11051_2013_1477_MOESM1_ESM.docx (9.8 mb)
Supplementary material 1 (DOCX 9994 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • T. S. Mahadevan
    • 1
  • M. Milosevic
    • 2
  • M. Kojic
    • 1
    • 2
  • F. Hussain
    • 1
    • 3
  • N. Kojic
    • 4
  • R. Serda
    • 1
  • M. Ferrari
    • 1
  • A. Ziemys
    • 1
    Email author
  1. 1.The Department of NanomedicineThe Methodist Hospital Research InstituteHoustonUSA
  2. 2.Bioengineering Research and Development CenterUniversity Metropolitan BelgradeKragujevacSerbia
  3. 3.University of HoustonHoustonUSA
  4. 4.Center for Engineering in Medicine and Surgical ServicesMassachusetts General Hospital, Harvard Medical SchoolBostonUSA

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