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The exponential growth in population and the increasing global temperaturetrickles down to an explosive demand in cooling and refrigeration. The viciouscycle of carbon footprint generation by these cooling devices can be broken bya mechanism of passive cooling. This study outlines research undertaken withthe aim to design such materials - exhibiting high reflectance in the solarspectrum and high emission in the atmospheric transparency window of 8-13$\mu$m. The Monte Carlo (MC) method is used to simulate light propagation in acomposite material aiding the design of metamaterials with these specificthermo-optical properties. A TiO$_2$/PDMS coating is fabricated to obtain > 91\% solar reflectivity and > 75 \% emissivity in the atmospheric transparencywindow. This translates to cooling the coated body by 4-9 $^\circ$C below theambient under peak solar irradiation in Mumbai, India. The facile fabricationprocess supplemented with the potential versatility of this coating showspromise to attain passive daytime radiative cooling on a commercial scale.

Achieving passive daytime radiative cooling via TiO$_2$/PDMS coating