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Publisher DOI: 10.1111/jace.16012
Title: High-temperature stable inverse opal photonic crystals via mullite-sol-gel infiltration of direct photonic crystals
Language: English
Authors: Bueno, Priscila 
Furlan, Kaline P. 
Hotza, Dachamir 
Janßen, Rolf 
Keywords: high-temperature applications;infiltration, mullite sol-gel;photonic crystals
Issue Date: 3-Dec-2018
Publisher: Wiley-Blackwell
Source: Journal of the American Ceramic Society 2 (102): 1- 9 (2018-12-03)
Journal or Series Name: Journal of the American Ceramic Society 
Abstract (english): Three-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.
DOI: 10.15480/882.2178
ISSN: 1551-2916
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
Project: SFB 986: Teilprojekt C5 - Oxidische Hochtemperatur-Schutzschichtsysteme mittels angepasster Porenstruktur 
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