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Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids

Very large thermal conductivity enhancement had been reported earlier in colloidal suspensions of solid nanoparticles (i.e., nanofluids) and more recently also in oil-in-water emulsions. In this study, nanoemulsions of alcohol and polyalphaolefin (PAO) are spontaneously generated by self-assembly, a...

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Autores principales: Xu, Jiajun, Yang, Bao, Hammouda, Boualem
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3211338/
https://www.ncbi.nlm.nih.gov/pubmed/21711807
http://dx.doi.org/10.1186/1556-276X-6-274
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author Xu, Jiajun
Yang, Bao
Hammouda, Boualem
author_facet Xu, Jiajun
Yang, Bao
Hammouda, Boualem
author_sort Xu, Jiajun
collection PubMed
description Very large thermal conductivity enhancement had been reported earlier in colloidal suspensions of solid nanoparticles (i.e., nanofluids) and more recently also in oil-in-water emulsions. In this study, nanoemulsions of alcohol and polyalphaolefin (PAO) are spontaneously generated by self-assembly, and their thermal conductivity and viscosity are investigated experimentally. Alcohol and PAO have similar thermal conductivity values, so that the abnormal effects, such as particle Brownian motion, on thermal transport could be deducted in these alcohol/PAO nanoemulsion fluids. Small angle neutron-scattering measurement shows that the alcohol droplets are spheres of 0.8-nm radius in these nanoemulsion fluids. Both thermal conductivity and dynamic viscosity of the fluids are found to increase with alcohol droplet loading, as expected from classical theories. However, the measured conductivity increase is very moderate, e.g., a 2.3% increase for 9 vol%, in these fluids. This suggests that no anomalous enhancement of thermal conductivity is observed in the alcohol/PAO nanoemulsion fluids tested in this study.
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spelling pubmed-32113382011-11-09 Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids Xu, Jiajun Yang, Bao Hammouda, Boualem Nanoscale Res Lett Nano Express Very large thermal conductivity enhancement had been reported earlier in colloidal suspensions of solid nanoparticles (i.e., nanofluids) and more recently also in oil-in-water emulsions. In this study, nanoemulsions of alcohol and polyalphaolefin (PAO) are spontaneously generated by self-assembly, and their thermal conductivity and viscosity are investigated experimentally. Alcohol and PAO have similar thermal conductivity values, so that the abnormal effects, such as particle Brownian motion, on thermal transport could be deducted in these alcohol/PAO nanoemulsion fluids. Small angle neutron-scattering measurement shows that the alcohol droplets are spheres of 0.8-nm radius in these nanoemulsion fluids. Both thermal conductivity and dynamic viscosity of the fluids are found to increase with alcohol droplet loading, as expected from classical theories. However, the measured conductivity increase is very moderate, e.g., a 2.3% increase for 9 vol%, in these fluids. This suggests that no anomalous enhancement of thermal conductivity is observed in the alcohol/PAO nanoemulsion fluids tested in this study. Springer 2011-03-31 /pmc/articles/PMC3211338/ /pubmed/21711807 http://dx.doi.org/10.1186/1556-276X-6-274 Text en Copyright ©2011 Xu et al; licensee Springer. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Nano Express
Xu, Jiajun
Yang, Bao
Hammouda, Boualem
Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids
title Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids
title_full Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids
title_fullStr Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids
title_full_unstemmed Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids
title_short Thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids
title_sort thermal conductivity and viscosity of self-assembled alcohol/polyalphaolefin nanoemulsion fluids
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3211338/
https://www.ncbi.nlm.nih.gov/pubmed/21711807
http://dx.doi.org/10.1186/1556-276X-6-274
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