• 文献标题:   Percolation network dynamicity and sheet dynamics governed viscous behavior of polydispersed graphene nanosheet suspensions
  • 文献类型:   Article
  • 作  者:   DHAR P, ANSARI MHD, SEN GUPTA S, SIVA VM, PRADEEP T, PATTAMATTA A, DAS SK
  • 作者关键词:   graphene, cnt, alumina, nanofluid, nanoparticle, viscosity, percolation, particle dynamic, modeling simulation
  • 出版物名称:   JOURNAL OF NANOPARTICLE RESEARCH
  • ISSN:   1388-0764 EI 1572-896X
  • 通讯作者地址:   Indian Inst Technol
  • 被引频次:   34
  • DOI:   10.1007/s11051-013-2095-2
  • 出版年:   2013

▎ 摘  要

The viscosity of polydispersed graphene nanosheet (5 nm-1.5 mu m) 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 mu m) and nano-alumina (45 nm) suspensions.