This study investigates the synergistic effect of combining multi-walled carbon nanotubes (MWNTs) and Fe2O3nanoparticles on thermal conductivity of nanofluid. Results show that low percentage hybrid fillers loading improve thermal conductivity of water based nanofluid, due to the good dispersion and interfacial adhesion, which is confirmed by scanning electron microscope. Furthermore, the hybrid fillers provide synergistic effect on heat conductive networks. The thermal conductivity enhancement of water based nanofluid containing 0.05 wt % MWNTs and 0.02 wt % Fe2O3nanoparticles is 27.75%, which is higher than that of nanofluid containing 0.2 wt % single MWNTs or Fe2O3nanoparticles.
We report a method to prepare surfactant-free water based nanofluids containing multi-walled carbon nanotubes (CNTs). The as prepared CNTs with hard dispersibility, after being cut by mechanical ball-milling approach following strong acid treatment, can be directly dispersed into water. The thermal conductivity of the nanofluids is optimized by controlling the CNT length and straightness. It is realized by changed the ball-milling times. The thermal conductivity enhancement of water based CNT nanofluids with volume fraction of 1% attains 29.5% by controlling the CNT length and straightness when the temperature is 63.9°C.
Copper sulfide (CuS) nanocrystals with flower-like and tubular morphology have been
successfully synthesized via a facile and convenient hydrothermal route at 75 °C by using
CuCl2·2H2O as Cu-precursor, C2H5NS as S-source and CTAB as template molecules. The effect of
concentration of reactants and template molecules on morphology has been discussed. X-ray
diffraction pattern suggests that the CuS crystals are pure hexagonal phase. The morphology of the
products has been studied by scanning electron microscope analysis. The absorption peaks of CuS
in UV and near-IR regions indicate that the as-prepared CuS are promising in the development of
photoelectric devices.
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