Thermeleon is a prototype temperature sensitive polymer coating for roof tiles that turns white on hot summer days, and black during the cold winter. It aims at maximizing sunlight reflection in the summer, and sunlight absorption in the winter, resulting in energy savings to maintain an adequate indoor temperature. Thermeleon uses a phase-changing-polymer gel with a polymer that dissolves when below a critical temperature. When the polymer dissolves, the gel becomes clear, exposing the black background of the tile. However, above the critical temperature the polymer phase separates from the gel, and the mixture becomes white. In 2009, Thermeleon won MIT's Making and Designing Materials Engineering Competition (MADMEC), from the Department of Materials Science and Engineering. The team has been exploring ways to bringing it to market.
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