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Thermal Diffusivity Dependence with Highly Concentrated Graphene Oxide/Water Nanofluids by Mode-Mismatched Dual-Beam Thermal Lens Technique
- Source :
- International Journal of Thermophysics. 42
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- The thermal properties of graphene oxide (GO) nanoparticles’ colloidal suspensions prepared using the microwave-assisted hydrothermal method were determined. The mode-mismatched dual-beam thermal lens technique was employed to measure the thermal diffusivity of GO nanoparticles for different concentrations in the base fluid. By fitting the experimental data to the theoretical expression, the characteristic time constant was determined. The thermal diffusivity of the fluids seemed to be strongly dependent on the presence of the nanoparticles, increasing from 15.02 ± 0.16 × 10−4 cm2·s−1 to 27.59 ± 0.51 × 10−4 cm2·s−1 for concentrations ranging from 0.82 %V to 4.00 %V of GO/H2O. As nanofluids concentration increased, a higher value of thermal diffusivity was obtained. The optical properties, morphology and chemical structure and functional groups of the nanoparticles were characterized by UV–Vis spectroscopy, transmission electron microscopy (TEM) and Fourier Transform infrared spectroscopy (FTIR). Two main absorption peaks at 230 nm and at 303 nm in the UV–Vis spectra were observed. TEM images revealed a uniform size distribution and spherical in shape NPs with mean diameter of 7.4 nm. This novel type of nanofluids have potential applications for heat transfer fluids like solar collectors and heat exchange systems.
- Subjects :
- Materials science
Graphene
Oxide
Analytical chemistry
Nanoparticle
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
Thermal diffusivity
law.invention
chemistry.chemical_compound
Nanofluid
020401 chemical engineering
chemistry
law
0204 chemical engineering
Fourier transform infrared spectroscopy
0210 nano-technology
Absorption (electromagnetic radiation)
Spectroscopy
Subjects
Details
- ISSN :
- 15729567 and 0195928X
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- International Journal of Thermophysics
- Accession number :
- edsair.doi...........6b586c4cc7b2bd852f07c78087619d44