Tungsten doped VO2/microgels hybrid thermochromic material and its smart window application

Thermal sensitive microgels were synthesized directly from hydroxypropyl cellulose (HPC) and acrylic acid (AA) in pure water. The first cloud point temperature, near 45 degrees C, of the inorganic/organic hybrid thermochromic material was obtained by dispersing W doped VO2 in HPCA microgels and the composite microgel is highly transparent at room temperature with T-lum = 80% when the thickness is 25 mu m. The excellent solar modulating ability (Delta T-sol) of 36%, high averaged T-lum of 56% and relatively high cloud point temperature of 50 degrees C make it suitable for smart windows applications compared with pure VO2 based materials and previously reported thermochromic hybrids.