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dc.contributor.authorPournorouz, Zahra
dc.contributor.authorMostafavi, Amirhossein
dc.contributor.authorPinto, Aditya
dc.contributor.authorBokka, Apparao
dc.contributor.authorJeon, Junha
dc.contributor.authorShin, Donghyun
dc.date.accessioned2017-02-07T22:52:55Z
dc.date.available2017-02-07T22:52:55Z
dc.date.issued2017-01-11
dc.identifier.citationPublished in Nanoscale Research Letters 12(29):1-10, 2017en_US
dc.identifier.issn1556-276X
dc.identifier.urihttp://hdl.handle.net/10106/26350
dc.description.abstractFor the last few years, molten salt nanomaterials have attracted many scientists for their enhanced specific heat by doping a minute concentration of nanoparticles (up to 1% by weight). Likewise, enhancing the specific heat of liquid media is important in many aspects of engineering such as engine oil, coolant, and lubricant. However, such enhancement in specific heat was only observed for molten salts, yet other engineering fluids such as water, ethylene glycol, and oil have shown a decrease of specific heat with doped nanoparticles. Recent studies have shown that the observed specific heat enhancement resulted from unique nanostructures that were formed by molten salt molecules when interacting with nanoparticles. Thus, such enhancement in specific heat is only possible for molten salts because other fluids may not naturally form such nanostructures. In this study, we hypothesized such nanostructures can be mimicked through in situ formation of fabricated nano-additives, which are putative nanoparticles coated with useful organic materials (e.g., polar-group-ended organic molecules) leading to superstructures, and thus can be directly used for other engineering fluids. We first applied this approach to polyalphaolefin (PAO). A differential scanning calorimeter (DSC), a rheometer, and a customized setup were employed to characterize the heat capacity, viscosity, and thermal conductivity of PAO and PAO with fabricated nano-additives. Results showed 44.5% enhanced heat capacity and 19.8 and 22.98% enhancement for thermal conductivity and viscosity, respectively, by an addition of only 2% of fabricated nanostructures in comparison with pure PAO. Moreover, a partial melting of the polar-group-ended organic molecules was observed in the first thermal cycle and the peak disappeared in the following cycles. This indicates that the in situ formation of fabricated nano-additives spontaneously occurs in the thermal cycle to form nanostructures. Figure of merit analyses have been performed for the PAO superstructure to evaluate its performance for heat storage and transfer media.
dc.description.sponsorshipThis work has been supported by UTA startup fund.en_US
dc.language.isoen_USen_US
dc.publisherSpringer Openen_US
dc.subjectPAO (polyalphaolefin)en_US
dc.subjectNano-additivesen_US
dc.subjectHeat capacityen_US
dc.subjectNanofluidsen_US
dc.subjectEthylen glycolen_US
dc.subjectThermal conductivityen_US
dc.titleEnhanced thermophysical properties via PAO superstructureen_US
dc.typeArticleen_US
dc.publisher.departmentDepartment of Mechanical Engineering, The University of Texas at Arlingtonen_US
dc.identifier.externalLinkhttp://nanoscalereslett.springeropen.com/articles/10.1186/s11671-016-1802-1
dc.identifier.externalLinkDescriptionThe original publication is available at the journal homepageen_US
dc.rights.licenseThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.en_US


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