High-precision thermal conductivity measurements as a probe of polymer/nanoparticle interfaces

Putnam, Shawn A.; Cahill, David G.; Ash, Benjamin J.; Schadler, Linda S.

doi:10.1063/1.1619202

Cited by 104 publications

(55 citation statements)

References 20 publications

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“…This prediction fits well if the nanoparticle thermal conductivity is much higher than that of the base fluid (>20 times). 54 However in our case, this ratio is $8 thus EMT is not applicable without further modifications. The under-prediction of EMT based models was attributed to the presence of interfacial thermal resistance (R) in between the nanoparticles and the surrounding fluid molecules, which can limit the interaction of the particles and thereby decrease the thermal transport.…”

Section: Resultsmentioning

confidence: 84%

Deterioration in effective thermal conductivity of aqueous magnetic nanofluids

Altan

Gurten²,

Sommerdijk

et al. 2014

Journal of Applied Physics

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Common heat transfer fluids have low thermal conductivities, which decrease their efficiency in many applications. On the other hand, solids have much higher thermal conductivity values. Previously, it was shown that the addition of different nanoparticles to various base fluids increases the thermal conductivity of the carrier fluid remarkably. However, there are limited studies that focus on the thermal conductivity of magnetic fluids. In this study, thermal conductivity of magnetic nanofluids composed of magnetite nanoparticles synthesized via co-precipitation and thermal decomposition methods is investigated. Results showed that the addition of magnetite nanoparticles decreased the thermal conductivity of water and ethylene glycol. This decrease was found to increase with increasing particle concentration and to be independent of the synthesis method, the type of surfactant, and the interfacial thermal resistance. V C 2014 AIP Publishing LLC.

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Section: Resultsmentioning

confidence: 84%

Deterioration in effective thermal conductivity of aqueous magnetic nanofluids

Altan

Gurten²,

Sommerdijk

et al. 2014

Journal of Applied Physics

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“…29 Therefore, h is calculated to be 3.07 nm for Ag NPs with a diameter of 7.3 ± 2.5 nm. The model developed by Putnam et al 30 suggests effective thermal conductivity by imposing the interfacial thermal resistance. However, k eff calculated from Putnam's EMT model does not fit the experimental data recorded.…”

Section: -6mentioning

confidence: 99%

The effect of functionalized silver nanoparticles over the thermal conductivity of base fluids

et al. 2017

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Thermal conductivities of nanofluids are expected to be higher than common heat transfer fluids. The use of metal nanoparticles has not been intensely investigated for heat transfer applications due to lack of stability. Here we present an experimental study on the effect of silver nanoparticles (Ag NPs) which are stabilized with surfactants, on the thermal conductivity of water, ethylene glycol and hexane. Hydrophilic Ag NPs were synthesized in aqueous medium with using gum arabic as surfactant and oleic acid/oleylamine were used to stabilize Ag NPs in the organic phase. The enhancement up to 10 per cent in effective thermal conductivity of hexane and ethylene glycol was achieved with addition of Ag NPs at considerably low concentrations (i.e. 2 and 1 per cent, by weight, for hexane and ethylene glycol respectively). However, almost 10 per cent of deterioration was recorded at effective thermal conductivity of water when Ag NPs were added at 1 per cent (by wt). Considerable amount of Gum Arabic in the medium is shown to be the major contributor to this fall, causing lowering of thermal conductivity of water. Same particles performed much better in ethylene glycol where the stabilizer does not lower the thermal conductivity of the base fluid. Also thermal conductivity of nanofluids was found to be temperature independent except water based Ag nanofluids above a threshold concentration. This temperature dependency is suggested to be due to inhibition of hydrogen bonding among water molecules in the presence of high amounts of gum arabic.

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“…Predictions of effective medium theories are accurate in some cases [3] but generally fail to account for the large enhancement in conductivity. In spite of a large number of -sometimes conflicting or controversial -suggestions and experimental findings [4], the microscopic mechanisms for such an increase remain unclear.…”

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confidence: 99%

Modeling Transient Absorption and Thermal Conductivity in a Simple Nanofluid

2006

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Molecular dynamics simulations are used to simulate the thermal properties of a model fluid containing nanoparticles (nanofluid). By modelling transient absorption experiments, we show that they provide a reliable determination of interfacial resistance between the particle and the fluid. The flexibility of molecular simulation allows us to consider separately the effect of confinement, particle mass and Brownian motion on the thermal transfer between fluid and particle. Finally, we show that in the absence of collective effects, the heat conductivity of the nanofluid is well described by the classical Maxwell Garnet equation model. *

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High-precision thermal conductivity measurements as a probe of polymer/nanoparticle interfaces

Cited by 104 publications

References 20 publications

Deterioration in effective thermal conductivity of aqueous magnetic nanofluids

Deterioration in effective thermal conductivity of aqueous magnetic nanofluids

The effect of functionalized silver nanoparticles over the thermal conductivity of base fluids

Modeling Transient Absorption and Thermal Conductivity in a Simple Nanofluid

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