Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Extinction Coefficient of Ag Nanofluids Manufactured by Chemical Reduction Method

화학적 환원법으로 제작한 은나노유체의 흡광계수

  • 이승현 (한국항공대학교 항공우주 및 기계공학부) ;
  • 김현진 (한국항공대학교 항공우주 및 기계공학부) ;
  • 최태종 (한국항공대학교 항공우주 및 기계공학부) ;
  • 김수빈 (한국항공대학교 항공우주 및 기계공학부) ;
  • 강예준 (한국항공대학교 항공우주 및 기계공학부) ;
  • 김동진 (한국항공대학교 항공우주 및 기계공학부) ;
  • 장석필 (한국항공대학교)
  • Received : 2015.03.13
  • Accepted : 2015.03.17
  • Published : 2015.03.31
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Abstract

In this study, we prepare the Ag nanofluids synthesized by the chemical reduction method and measure the extinction coefficient of those nanofluids at a wavelength of 632.8 nm. The Ag nanofluids are synthesized by the chemical reduction method using silver nitrate ($AgNO_3$) and sodium borohydride ($NaBH_4$) in water and ethylene glycol (EG). For stable dispersion of Ag particles in the base liquids, polyvinyl pyrrolidone (PVP) is added as a surfactant. The extinction coefficient of manufactured Ag nanofluids is measured by an in-house developed measurement system at the wavelength of 632.8 nm. The results show that the extinction coefficient of water-based and EG-based Ag nanofluids is linearly increased with respect to the particle loadings. Moreover, it is shown that the extinction coefficient of EG-based Ag nanofludis is higher than that of water-based Ag nanofluids. Finally we compare the experimental results with both the Maxwell-Garnett model and Rayleigh scattering approximation model, and they demonstrate that the Rayleigh scattering approximation model is reasonably predict the extinction coefficient of Ag nanofluids using hydraulic diameter of silver nanoparticle.

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References

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