A novel polyaniline (PANI)/ paraffin wax nano composite phase change material: Superior transition heat storage capacity, thermal conductivity and thermal reliability. (1st July 2020) - George, Mathew
Graphical abstract: Highlights: Novel nanocomposite prepared using paraffin wax and polyaniline. Improved latent heat and thermal conductivity of PWP-1 by 8.2 and 46.8% respectively. Solar light transmission of PWP reduced by ~78% relative to paraffin wax. After 200 thermal cycles, latent heat value of PWP-1 is greater than paraffin wax. Abstract: An energy source is required that has potential to reduce global warming, energy cost and create environmental sustainability. Solar energy is a viable candidate with 120 petajoules of energy on earth per second. To utilize this energy the present research explores the effect of the addition of conducting polyaniline (PANI) and cupric (II) oxide (CuO) nanoparticles within the matrix of paraffin wax. The Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric Analyzer (TGA), Differential Scanning Calorimetry (DSC), Ultraviolet–Visible-Near Infrared Spectrometer (UV–VIS) and thermal conductivity characterization of the prepared composite were performed. An enhancement of latent heat capacity of paraffin/PANI nanocomposite by 8.20% and paraffin/CuO composite by 7.81% was observed. Thermal conductivity of Paraffin/PANI was increased by ~46.8% for a 1% weight concentration of PANI in paraffin wax the same concentration as maximum latent heat capacity. In the case of paraffin/CuO composite, the maximum increment of thermal conductivity was found to be ~63.6%. To check the thermal reliability of the formulated nanocomposite, the base paraffin and nanocomposites were subjected to thermal cycling of 200 cycles. The DSC results showed that paraffin/PANI nanocomposite outperformed both base paraffin wax and paraffin/CuO composite. With comparable thermal conductivity to Paraffin/CuO composite, better latent heat capacity and improved thermal reliability Paraffin/PANI composite results are encouraging for the application in solar application area.