Microstructure characterization of porous microalloyed aluminium-silicate ceramics

Abstract

Kaolinite and bentonite clay powders mixed with active additives, based on Mg(NO3)2 and Al(NO3)2, sintered at high temperatures produce very porous ceramics with microcrystalline and amorphous regions and highly developed metalized surfaces (mainly with magnesium surplus). Microstructure investigations have revealed non-uniform and highly porous structure with broad distribution of grain size, specifically shaped grains and high degree of agglomeration. The ceramics samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction analysis (XRD) and IR spectroscopy analysis, prior and after treatment in “synthetic water”, i.e. in aqueous solution of arsenic-salt. Grain size distribution for untreated and treated samples was done with software SemAfore 4. It has shown great variety in size distribution of grains from clay powders to sintered samples

Highly Luminescent and Ultrastable CsPbBr3 Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith

“…Figure S6 showed the FTIR spectra of the SAM and CsPbBr 3 QDs‐SAM with different annealing temperature. A broad band from 992 cm −1 to 1155 cm −1 corresponding to amorphous aluminum silicate (often expressed as x Al 2 O 3 ⋅ y SiO 2 ), was presented in both CsPbBr 3 QDs‐SAM and SAM. Particularly, this broad band became stronger with increasing the annealing temperature.…”

Highly Luminescent and Ultrastable CsPbBr3 Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith

“…If the anneal temperature was increased to 100 8 8C, the PL intensity of CsPbBr 3 QDs-SAM decreased to 70 %o ft he initial intensity.W hen we did the same thermal anneal treatments for the bare CsPbBr 3 QDs at 50 8 8Ca nd 100 8 8C, which just could keep 60 %a nd 20 %o ft he initial intensity,r espectively.T hese results indicated that the CsPbBr 3 QDs-SAM powder sample exhibited much better thermal stability than the CsPbBr 3 QDs. Figure S6 showed the FTIR spectra of the SAM and CsPbBr 3 QDs-SAM with different annealing temperature.Abroad band from 992 cm À1 to 1155 cm À1 corresponding to amorphous aluminum silicate (often expressed as x Al 2 O 3 ·y SiO 2 ), [22] was presented in both CsPbBr 3 QDs-SAM and SAM. Particularly,t his broad band became stronger with increasing the annealing temperature.…”

“…[21] Thes ame principle can also be employed to strengthen the photostability of CsPbBr 3 QDs-SAM. Figure S6 showed the FTIR spectra of the SAM and CsPbBr 3 QDs-SAM with different annealing temperature.Abroad band from 992 cm À1 to 1155 cm À1 corresponding to amorphous aluminum silicate (often expressed as x Al 2 O 3 ·y SiO 2 ), [22] was presented in both CsPbBr 3 QDs-SAM and SAM. It was observed that the PL intensity of CsPbBr 3 QDs-SAM underwent ignorable change at 50 8 8C ( Figure S5).…”

Effect of the Electronic Structure on the Stability of CdSe/CdS and CdSe/CdS/ZnS Quantum-Dot Phosphors Incorporated into a Silica/Alumina Monolith

“…Figure A shows the FTIR spectra of the SAM and CdSe/CdS/ZnS QD–SAM phosphor with varied QD wt %. A broad band from 992 to 1155 cm –1 corresponding to amorphous aluminum silicate ( x Al 2 O 3 · y SiO 2 ) was presented in both the CdSe/CdS/ZnS QD–SAM phosphor and SAM, which may be a proof of existence of Al 2 O 3 and SiO 2 in the CdSe/CdS/ZnS QD–SAM. Particularly, this broad band became stronger with increasing DBATES content.…”