Bueno, PriscilaPriscilaBuenoFurlan, Kaline P.Kaline P.FurlanHotza, DachamirDachamirHotzaJanßen, RolfRolfJanßen2019-04-172019-04-172018-12-03Journal of the American Ceramic Society 2 (102): 1- 9 (2018-12-03)http://hdl.handle.net/11420/2303Three-dimensionally ordered macroporous materials for photonic or refractory applications have been developed by an innovative approach based on mullite sol-gel infiltration of direct photonic crystals followed by burn-out and calcination. Direct photonic crystals were obtained using polystyrene spheres templates either by vertical convective self-assembly or by drop casting. The samples were then infiltrated by spin coating with mullite sol-gels prepared with two different compositions (74 wt.% Al 2 O 3 , 26 wt.% SiO 2 and 80 wt.% Al2O 3 , 20 wt.% SiO 2 ). The inverse opal photonic crystals prepared with both sol-gels presented a highly ordered porosity and the high-alumina composition showed stability up to 1500°C. After inversion of the structure (polymeric template burn-out), the high-alumina composition showed roundness of the PS templated pores closer to an ideal sphere (Ø = 0.967) when compared to the low-alumina composition (Ø = 0.954). Although the inverse opal photonic crystals did not present a photonic bandgap, they showed structural stability at high temperatures, which enable their application as refractory materials.en0002-78202018219Wiley-Blackwellhttps://creativecommons.org/licenses/by-nc/4.0/high-temperature applicationsinfiltration, mullite sol-gelphotonic crystalsTechnikJournal Articleurn:nbn:de:gbv:830-882.03046510.15480/882.217810.1111/jace.1601210.15480/882.2178Journal Article