Abstract
The pulsed laser thermal lens technique was used to study the thermal diffusivity of fluids containing copper nanoparticles (Cu-NPs) prepared by γ-irradiation method. The samples were prepared for the different concentrations of Cu precursor at 20.KGy dose. A Q-switched Nd-YAG pulsed laser of wavelength 532.nm was used as an excitation source and He-Ne laser was used as a probe beam in the present thermal lens experiment. It was found that the thermal diffusivity of the solution depends on the density of Cu-NPs.
Highlights
Metal NPs with various unique applications are very interesting materials for the researchers
Some important applications of metal NPs are in electronic, optical components [1, 2], as targeted thermal agents in medical therapies and drug delivery, high functioning heat transfer fluids in automotive electronic cooling systems and in micro-channel heat sinks [3]–[8]
After finding tc by fitting Eq (1) to the normalized thermal lens (TL) time evolution data, thermal diffusivity can be calculated from the Eq (4)
Summary
Metal NPs with various unique applications are very interesting materials for the researchers. The ability of this technique for measurement on the thermal diffusivity of nano-fluids was confirmed by many researchers [18]–[21]. We used pulsed laser TL technique to measure the thermal diffusivity of fluids containing Cu-NPs which were prepared by γ-irradiation method.
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