TY - JOUR
T1 - Thermal diffusivity measurement of spherical gold nanofluids of different sizes/concentrations
AU - López-Muñoz, Gerardo A.
AU - Pescador-Rojas, José A.
AU - Ortega-Lopez, Jaime
AU - Salazar, Jaime Santoyo
AU - Abraham Balderas-López, J.
N1 - Funding Information:
The authors acknowledge Zaber Technologies, Inc. for providing a micro-linear stage, Química Aromática SA, COFAA-IPN and CONACyT for the partial support of this work.
PY - 2012/7/30
Y1 - 2012/7/30
N2 - In recent times, nanofluids have been studied by their thermal properties due to their variety of applications that range from photothermal therapy and radiofrequency hyperthermia (which have proven their potential use as coadjutants in these medical treatments for cancer diseases) to next-generation thermo-fluids. In this work, photoacoustic spectroscopy for a specific study of thermal diffusivity, as a function of particle size and concentration, on colloidal water-based gold nanofluids is reported. Gold nanoparticles were synthetized in the presence of hydroquinone through a seed-mediated growth with homogenous sizes and shapes in a range of 16 to 125 nm. The optical response, size and morphology of these nanoparticles were characterized using ultraviolet-visible spectroscopy and transmission electron microscopy, respectively. Thermal characterizations show a decrease in the thermal diffusivity ratio as the nanoparticle size is increased and an enhancement in thermal diffusivity ratio as nanoparticle concentration is added into the nanofluids. Compared with other techniques in the literature such as thermal lens and hot wire method, this photoacoustic technique shows an advantage in terms of precision, and with a small amount of sample required (500 μl), this technique might be suitable for the thermal diffusivity measurement of nanofluids. It is also a promising alternative to classical techniques.
AB - In recent times, nanofluids have been studied by their thermal properties due to their variety of applications that range from photothermal therapy and radiofrequency hyperthermia (which have proven their potential use as coadjutants in these medical treatments for cancer diseases) to next-generation thermo-fluids. In this work, photoacoustic spectroscopy for a specific study of thermal diffusivity, as a function of particle size and concentration, on colloidal water-based gold nanofluids is reported. Gold nanoparticles were synthetized in the presence of hydroquinone through a seed-mediated growth with homogenous sizes and shapes in a range of 16 to 125 nm. The optical response, size and morphology of these nanoparticles were characterized using ultraviolet-visible spectroscopy and transmission electron microscopy, respectively. Thermal characterizations show a decrease in the thermal diffusivity ratio as the nanoparticle size is increased and an enhancement in thermal diffusivity ratio as nanoparticle concentration is added into the nanofluids. Compared with other techniques in the literature such as thermal lens and hot wire method, this photoacoustic technique shows an advantage in terms of precision, and with a small amount of sample required (500 μl), this technique might be suitable for the thermal diffusivity measurement of nanofluids. It is also a promising alternative to classical techniques.
KW - Gold nanoparticles
KW - Nanofluids
KW - Photoacoustic
KW - Thermal diffusivity
UR - http://www.scopus.com/inward/record.url?scp=84866102811&partnerID=8YFLogxK
U2 - 10.1186/1556-276X-7-423
DO - 10.1186/1556-276X-7-423
M3 - Artículo
C2 - 22846704
SN - 1931-7573
VL - 7
JO - Nanoscale Research Letters
JF - Nanoscale Research Letters
M1 - 423
ER -