TY - JOUR
T1 - Thermal diffusivity measurement for urchin-like gold nanofluids with different solvents, sizes and concentrations/shapes
AU - López-Muñoz, Gerardo A.
AU - Balderas-López, José Abraham
AU - Ortega-Lopez, Jaime
AU - Pescador-Rojas, José A.
AU - Salazar, Jaime Santoyo
N1 - Funding Information:
The authors acknowledge Zaber Technologies, Inc. for providing a micro-linear stage and Química Aromática SA, COFAA-IPN and CONACyT for the partial support of this work.
PY - 2012
Y1 - 2012
N2 - The thermal properties of nanofluids are an especially interesting research topic because of the variety of potential applications, which range from bio-utilities to next-generation heat-transfer fluids. In this study, photopyroelectric calorimetry for measuring the thermal diffusivity of urchin-like colloidal gold nanofluids as a function of particle size, concentration and shape in water, ethanol and ethylene glycol is reported. Urchin-like gold nanoparticles were synthesised in the presence of hydroquinone through seed-mediated growth with homogeneous shape and size ranging from 55 to 115 nm. The optical response, size and morphology of these nanoparticles were characterised using UV-visible spectroscopy and transmission electron microscopy. The thermal diffusivity of these nanofluids decreased as the size of the nanoparticles increased, and the enhancement depended on the thermal diffusivity of the solvent. The opposite effect (increase in thermal diffusivity) was observed when the nanoparticle concentration was increased. These effects were more evident for urchin-like gold nanofluids than for the corresponding spherical gold nanofluids.
AB - The thermal properties of nanofluids are an especially interesting research topic because of the variety of potential applications, which range from bio-utilities to next-generation heat-transfer fluids. In this study, photopyroelectric calorimetry for measuring the thermal diffusivity of urchin-like colloidal gold nanofluids as a function of particle size, concentration and shape in water, ethanol and ethylene glycol is reported. Urchin-like gold nanoparticles were synthesised in the presence of hydroquinone through seed-mediated growth with homogeneous shape and size ranging from 55 to 115 nm. The optical response, size and morphology of these nanoparticles were characterised using UV-visible spectroscopy and transmission electron microscopy. The thermal diffusivity of these nanofluids decreased as the size of the nanoparticles increased, and the enhancement depended on the thermal diffusivity of the solvent. The opposite effect (increase in thermal diffusivity) was observed when the nanoparticle concentration was increased. These effects were more evident for urchin-like gold nanofluids than for the corresponding spherical gold nanofluids.
KW - Nanofluids
KW - Photopyroelectric
KW - Thermal diffusivity
KW - Urchin-like gold nanoparticles
UR - http://www.scopus.com/inward/record.url?scp=84875341218&partnerID=8YFLogxK
U2 - 10.1186/1556-276X-7-667
DO - 10.1186/1556-276X-7-667
M3 - Artículo
SN - 1931-7573
VL - 7
SP - 1
EP - 7
JO - Nanoscale Research Letters
JF - Nanoscale Research Letters
IS - 1
M1 - 667
ER -