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Saterlie et al. Nanoscale Research Letters 2011, 6:217

Saterlie et al. Nanoscale Research Letters 2011, 6:217 http://www.nanoscalereslett.com/content/6/1/217 NANO EXPRESS Open Access Particle size effects in the thermal conductivity enhancement of copper-based nanofluids Michael Saterlie1, Huseyin Sahin2, Barkan Kavlicoglu2, Yanming Liu2, Olivia Graeve1* Abstract We present an analysis of the dispersion characteristics and thermal conductivity performance of copper-based nanofluids. The copper nanoparticles were prepared using a chemical reduction methodology in the presence of a stabilizing surfactant, oleic acid or cetyl trimethylammonium bromide (CTAB). Nanofluids were prepared using water as the base fluid with copper nanoparticle concentrations of 0.55 and 1.0 vol.%. A dispersing agent, sodium dodecylbenzene sulfonate (SDBS), and subsequent ultrasonication was used to. | Saterlie et al. Nanoscale Research Letters 2011 6 217 http www.nanoscalereslett.eom content 6 1 217 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Particle size effects in the thermal conductivity enhancement of copper-based nanofluids Michael Saterlie1 Huseyin Sahin2 Barkan Kavlicoglu2 Yanming Liu2 Olivia Graeve1 Abstract We present an analysis of the dispersion characteristics and thermal conductivity performance of copper-based nanofluids. The copper nanoparticles were prepared using a chemical reduction methodology in the presence of a stabilizing surfactant oleic acid or cetyl trimethylammonium bromide CTAB . Nanofluids were prepared using water as the base fluid with copper nanoparticle concentrations of 0.55 and 1.0 vol. . A dispersing agent sodium dodecylbenzene sulfonate SDBS and subsequent ultrasonication was used to ensure homogenous dispersion of the copper nanopowders in water. Particle size distribution of the copper nanoparticles in the base fluid was determined by dynamic light scattering. We found that the 0.55 vol. Cu nanofluids exhibited excellent dispersion in the presence of SDBS. In addition a dynamic thermal conductivity setup was developed and used to measure the thermal conductivity performance of the nanofluids. The 0.55 vol. Cu nanofluids exhibited a thermal conductivity enhancement of approximately 22 . In the case of the nanofluids prepared from the powders synthesized in the presence of CTAB the enhancement was approximately 48 over the base fluid for the 1.0 vol. Cu nanofluids which is higher than the enhancement values found in the literature. These results can be directly related to the particle agglomerate size of the copper nanoparticles in water as determined from dynamic light scattering. Background It is well-known that the thermal conductivity of fluids such as water or ethylene glycol can be enhanced through the addition of nanoparticles. These two-component systems have effective thermal .