Thermal conductivities of naked and monolayer protected metal nanoparticle based nanofluids: Manifestation of anomalous enhancement and chemical effects

Thermal conductivities of naked and monolayer protected metal nanoparticle based nanofluids: Manifestation of anomalous enhancement and chemical effects

Thermal conductivities of two kinds of Au nanoparticles were measured in water and toluene media. The water soluble particles, 10–20 nm in mean diameter, made with citrate stabilization showed thermal conductivity enhancement of 5%–21% in the temperature range of 30–60 °C at a loading of 0.000 26 (b...

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Veröffentlicht in:Applied physics letters 2003-10, Vol.83 (14), p.2931-2933
Hauptverfasser: Patel, Hrishikesh E., Das, Sarit K., Sundararajan, T., Sreekumaran Nair, A., George, Beena, Pradeep, T.
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container_end_page 2933
container_issue 14
container_start_page 2931
container_title Applied physics letters
container_volume 83
creator Patel, Hrishikesh E.
Das, Sarit K.
Sundararajan, T.
Sreekumaran Nair, A.
George, Beena
Pradeep, T.
description Thermal conductivities of two kinds of Au nanoparticles were measured in water and toluene media. The water soluble particles, 10–20 nm in mean diameter, made with citrate stabilization showed thermal conductivity enhancement of 5%–21% in the temperature range of 30–60 °C at a loading of 0.000 26 (by volume). The effect was 7%–14% for Au particles stabilized with a monolayer of octadecanethiol even for a loading of 0.011%. Comparatively lower thermal conductivity enhancement was observed for larger diameter Ag particles for significantly higher loading. Effective enhancement of 9%, even at vanishing concentrations, points to additional factors in the thermal conductivity mechanism in nanofluids. Results also point to important chemical factors such as the need for direct contact of the metal surface with the solvent medium to improve enhancement.
doi_str_mv 10.1063/1.1602578
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title Thermal conductivities of naked and monolayer protected metal nanoparticle based nanofluids: Manifestation of anomalous enhancement and chemical effects
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