Anomalously enhanced thermal conductivity of graphite-oxide nanofluids synthesized via liquid-phase pulsed laser ablation

Wai Kit Woo, Yew Mun Hung, Xin Wang

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Graphite-oxide (GO) nanofluids with enhanced thermal conductivity are successfully prepared using pulsed laser ablation in liquid (PLAL) of a graphite target in deionized water. The effects of laser frequencies are investigated on the variations of GO nanoparticles. The morphology, structure and composition of the nanoparticles are characterized using various spectroscopic techniques. During the PLAL process, graphite is oxidized to GO which is inherently hydrophilic, no surfactant is required in the preparation of nanofluid. The laser frequency significantly affects the size and morphology of the GO nanoparticles during laser ablation, leading to a profound variation in the thermophysical properties of the GO nanofluids. At the laser frequency of 10 Hz, the maximum thermal conductivity enhancement of 82% is achieved at a temperature of 50 °C while the maximum viscosity increment is recorded at a temperature of 30 °C. This study shows the great potential of the PLAL method in synthesizing GO nanofluid with anomalously enhanced thermal conductivity.

    Original languageEnglish
    Article number100993
    Number of pages13
    JournalCase Studies in Thermal Engineering
    Volume25
    DOIs
    Publication statusPublished - Jun 2021

    Keywords

    • Graphite-oxide nanofluid
    • Laser frequency
    • Pulsed laser ablation
    • Thermal conductivity
    • Viscosity

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