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Percolation network dynamicity and sheet dynamics governed viscous behavior of polydispersed graphene nanosheet suspensions

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Abstract

The viscosity of polydispersed graphene nanosheet (5 nm–1.5 μm) suspensions (GNS) and its behavior with temperature and concentration have been experimentally determined. A physical mechanism for the enhanced viscosity over the base fluids has been proposed for the polydispersed GNSs. Experimental data reveal that enhancement of viscosity for GNSs lies in between those of carbon nanotube suspensions (CNTSs) and nano-alumina suspensions, indicating the hybrid mechanism of percolation (like CNTs) and Brownian motion-assisted sheet dynamics (like alumina particles). Sheet dynamics and percolation, along with a proposed percolation network dynamicity factor, have been used to determine a dimensionally consistent analytic model to accurately determine and explain the viscosity of polydispersed GNSs. The model also provides insight into the mechanisms of viscous behavior of different dilute nanoparticle suspensions. The model has been found to be in agreement with the GNS experimental data, and even for CNT (diameter 20 nm, length 10 μm) and nano-alumina (45 nm) suspensions.

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Acknowledgments

The authors thank the Defense Materials and Stores Research & Development Establishment (DMSRDE) (a Defense Research and Development Organization (DRDO) laboratory) for financial support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India

    Purbarun Dhar, V. Manoj Siva, Arvind Pattamatta & Sarit K. Das

  2. Department of Mechanical Engineering, Indian Institute of Technology Patna, Patna, 800013, India

    Mohammad Hasan Dad Ansari

  3. Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India

    Soujit Sen Gupta & T. Pradeep

Authors
  1. Purbarun Dhar
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  2. Mohammad Hasan Dad Ansari
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  3. Soujit Sen Gupta
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  4. V. Manoj Siva
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  5. T. Pradeep
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  6. Arvind Pattamatta
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  7. Sarit K. Das
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Corresponding author

Correspondence to Sarit K. Das.

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Purbarun Dhar and Mohammad Hasan Dad Ansari have contributed equally to this study.

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Dhar, P., Ansari, M.H.D., Gupta, S.S. et al. Percolation network dynamicity and sheet dynamics governed viscous behavior of polydispersed graphene nanosheet suspensions. J Nanopart Res 15, 2095 (2013). https://doi.org/10.1007/s11051-013-2095-2

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  • DOI: https://doi.org/10.1007/s11051-013-2095-2

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