[논문]Design and preparation of a type of γ-Ce2S3c-SiO2-coated red pigment with a plum pudding mosaic structure: The effect of pre-sintering temperature on pigment properties

Wu, Fuling; Li, Xin; Li, Yueming; Wang, Zhumei; Hong, Yan; Shen, Zongyang; Song, Fusheng

doi:10.1016/j.micromeso.2020.110699

[해외논문] Design and preparation of a type of γ-Ce2S3c-SiO2-coated red pigment with a plum pudding mosaic structure: The effect of pre-sintering temperature on pigment properties

Microporous and mesoporous materials : the official journal of the International Zeolite Association, v.311, 2021년, pp.110699 -

Wu, Fuling (Corresponding author) , Li, Xin , Li, Yueming , Wang, Zhumei , Hong, Yan , Shen, Zongyang , Song, Fusheng

Abstract ▼ AI-Helper

Abstract In this study, amorphous SiO2 (a-SiO2) gel powder was prepared by an acid-base two-step catalytic sol-gel method and pre-burned at different temperatures (150 °C, 400 °C, 600 °C, and 800 °C) to obtain mesoporous formed by the accumulation of a-SiO2 nanoparticles, in which CeO2 was coated to form CeO2@a-SiO2. The CeO2@a-SiO2 obtained by the above-mentioned method was used as a precursor, a crystalline silica-(c-SiO2) coated γ-Ce2S3 (γ-Ce2S3@c-SiO2) red pigment with a plum pudding mosaic structure was obtained by sulfidation at 900 °C in CS2 atmosphere, and calcination at 1300 °C in an Ar-protected atmosphere. A systematic study examined the influence of different pre-sintering temperatures on the morphology and microstructure of the precursor particles along with the chromaticity and thermal stability of the coated pigment. The results reveal that at a pre-sintering temperature of 400 °C, the surface area and pore volume of the precursor reached maximum values of 274 m2/g and 0.27 cm³/g, respectively, while the average aperture reached 3.49 nm. Under this experimental condition, the obtained coated pigment exhibited the highest chromaticity values of L* = 30.46, a* = 37.73, and b* = 26.41. At these values, and following calcination at 900 °C for 10 min in air, the pigment still maintained a bright-red color (L* = 27.61, a* = 29.06, and b* = 17.25); this indicates that the plum pudding mosaic-type γ-Ce2S3@c-SiO2 red pigment can increase the thermal stability of γ-Ce2S3 from 350 °C to 900 °C. It shows that mesoporous SiO2 can be applied to novel fields of coated pigments by structural design and high-temperature calcination. Highlights Mesoporous precursors formed by amorphous nano-SiO2 stacking with CeO2 located in the mesoporous were obtained. The prepared CeO2@SiO2 mesoporous precursors were calcined at 1300 °C to form a dense plum pudding mosaic coating structure. The γ-Ce2S3 formed by the sulfidation of CeO2 was coated by this structure. This structure was found to be effective in enhancing the thermal stability of γ-Ce2S3 by temperature-resistance tests. Mesoporous SiO2 can be applied to novel fields of coating pigments by structural design and high-temperature calcination. Graphical abstract amorphous SiO2 (a-SiO2) gel powder was prepared by an acid-base two-step catalytic sol-gel method and pre-burned at different temperatures (150 °C, 400 °C, 600 °C, and 800 °C) to obtain mesoporous formed by the accumulation of a-SiO2 nanoparticles, in which CeO2 was coated to form CeO2@a-SiO2. The prepared CeO2@SiO2 mesoporous precursors were calcined at 1300 °C to form a plum pudding mosaic coating structure, in which γ-Ce2S3 formed after CeO2 sulfidation was coated, and this structure was found to be effective in enhancing the thermal stability of γ-Ce2S3 by temperature-resistance tests, showing that mesoporous SiO2 can be applied to a novel field of coating pigments by structural design and high-temperature calcination. Schematic pattern of gel structure changes in the two-step acid-base catalytic process. [DISPLAY OMISSION]

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