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Thermal conductivity, viscosity, and electrical conductivity of iron oxide with a cloud fractal structure

Jamilpanah, P ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1007/s00231-016-1891-5
  3. Publisher: Springer Verlag , 2017
  4. Abstract:
  5. In the present study, nanoscale iron oxide was synthesized using a hydrothermal method; XRD analysis revealed that all the produced crystals are iron oxide. FESEM microscopic imaging showed that particles are on the scale of nano and their morphology is cloud fractal. To study the laboratory properties of thermal conductivity, viscosity, and electrical conductivity of the nanoparticles, they were dispersed in ethylene glycol-based fluid and the nanofluid was in a two-step synthesis during this process. The experiments were carried out with a weight fraction between 0 and 2 % at temperatures between 25 and 45 °C. According to the results of the experiments, increasing the density of nanoparticles in the fluid increases thermal conductivity, as it was predicted in all theoretical models. On the other hand, nano viscosity increases as the weight fraction increases while it decreases as temperature goes up. Electrical conductivity also increases with raising the temperature and weight fraction. Theoretical models were studied to predict Thermal conductivity, viscosity, and electrical conductivity of the nanofluid. © 2016, Springer-Verlag Berlin Heidelberg
  6. Keywords:
  7. Electric conductivity ; Ethylene ; Ethylene glycol ; Fractals ; Iron ; Iron oxides ; Nanofluidics ; Nanoparticles ; Synthesis (chemical) ; Thermal conductivity of liquids ; Viscosity ; Electrical conductivity ; Fractal structures ; Hydrothermal methods ; Microscopic imaging ; Two-step synthesis ; Viscosity increase ; Weight fractions ; XRD analysis ; Thermal conductivity
  8. Source: Heat and Mass Transfer/Waerme- und Stoffuebertragung ; Volume 53, Issue 4 , 2017 , Pages 1343-1354 ; 09477411 (ISSN)
  9. URL: https://link.springer.com/article/10.1007%2Fs00231-016-1891-5