Synthesis and characterization of three-dimensionally ordered macroporous rare earth oxides

Improved CO Oxidation Activity of 3DOM Pr-Doped Ceria Catalysts: Something Other Than an Ordered Macroporous Structure

“…Large spherical macropores with roughly 80 nm diameter are arranged in the same way as the PMMA spheres. This shrinkage from 200 to 80 nm (60%) is quite similar to that reported by other authors for other 3DOM-ceria catalysts [20]. The inset in Figure 2b shows that the spherical macropores are linked by smaller windows, which are necessary for the gases to diffuse into the solid structure during the catalytic reactions.…”

Rutile TiO2 inverse opal with photonic bandgap in the UV–visible range

“…Opals are deposited on a substrate by the self-assembly of submicrospheres (silica or polymeric) from a colloidal suspension into a three-dimensional periodic structure [23][24][25][26]. In a subsequent step, the interstitial space in this colloidal crystal is filled with a dielectrical material using sol-gel, chemical deposition or nanoparticle infiltration methods [6,7,[27][28][29][30][31][32][33][34][35][36][37][38]. The replica of the original template is obtained by the removal of the colloidal crystal template either by calcination or chemical dissolution in order to achieve a refractive index contrast higher than 2.8 inside the structure.…”

Synthesis of three-dimensionally ordered macroporous Al–Ce mixed oxide catalysts with high catalytic activity and stability for diesel soot combustion

“…The 3DOM PMMA colloidal crystal templates were assembled via a centrifugation method [28]. A certain amount of PMMA latex was centrifuged at a rate of 3000 rpm for 10 h. After the PMMA colloidal spheres were fully precipitated, the supernatant was carefully removed by a dropper.…”