Structural and Optical Properties of PVP/PAA/MnO2 Nanofluid for Solar Collectors’ Systems.

In this paper, preparation of PVP/PAA/MnO₂ nanofluid and studying its structural and optical properties for solar collectors’ systems are investigated. Optical characteristics of PVP/PAA/MnO₂ nanofluid are measured at wavelength of 220–820 nm. Results indicate that the absorption of H₂O/PVP/PAA fluid enhances, while the transmission reduces as the MnO₂ ratio increases. The optical microscope images show homogeneous distribution of MnO₂ nanoparticles in H₂O/PVP/PAA medium. The thermal-energy storage application of H₂O/PVP/PAA/MnO₂ nanofluid is tested. The results of application indicate that the time of heating decreases with the increase in MnO2 nanoparticles’ concentration. [ABSTRACT FROM AUTHOR]