Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 12, Issue 6, Pages 4553-4559Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2012.6193
Keywords
Hybrid Dispersion; Nanofluids; Planetary Ball Mill; Absorbance; Thermal Conductivity
Categories
Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012-0021376]
- National Research Foundation of Korea [2011-0009022, 핵06B1111] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Synthesis of water based Al2O3-MWCNTs hybrid nanofluids have been investigated and characterized. Al2O3-MWCNTs nanoparticles in weight proportion of 97.5:2.5 to 90:10 have been studied over 1% to 6% weight concentration. Dispersion quality of nanofluids is assured by additional synthesis process like acids treatment and grinding of MWCNTs by planetary ball mill. The effects of ground and non-ground MWCNTs over dispersion quality and thermal conductivity have been investigated. Sedimentation effect of hybrid nanofluids with time length has been studied by sample visualization and TEM micrographs. The augmentative absorbance and thermal conductivity of hybrid nanofluids have been compared with pure Al2O3/water nanofluids. The overall result shows that the enhancement in normalized thermal conductivity of hybrid nanofluids is still not so sharp though the absorbance and other qualities show much better comparing mono type nanofluids. Hybrid nanofluids with spherical particles show a smaller increase in thermal conductivity comparing cylindrical shape particles.
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