Taha-Tijerina J.J.,Rice University |
Narayanan T.N.,Council of Scientific and Industrial Research Central Electrochemical Research Institute |
Tiwary C.S.,Rice University |
Tiwary C.S.,Indian Institute of Science |
And 3 more authors.
ACS Applied Materials and Interfaces | Year: 2014
Dispersions of nanodiamond (average size ∼6 nm) within dielectric insulator mineral oil are reported for their enhanced thermal conductivity properties and potential applications in thermal management. Dynamic and kinematic viscosities - very important parameters in thermal management by nanofluids - are investigated. The dependence of the dynamic viscosity is well-described by the theoretical predictions of Einstein's model. The temperature dependence of the dynamic viscosity obeys an Arrhenius-like behavior, where the activation energy and the pre-exponential factor have an exponential dependence on the filler fraction of nanodiamonds. An enhancement in thermal conductivity up to 70% is reported for nanodiamond based thermal fluids. Additional electron microscopy, Raman spectroscopy and X-ray diffraction analysis support the experimental data and their interpretation. © 2014 American Chemical Society.