Hexagonal trumpet-like sodium hexafluorosilicate （SFS） flowers, grown on an ordered porous polystyrene film （OPPF）, were prepared via a synchronous dissolution/regrowth process. Their formation process can be divi...Hexagonal trumpet-like sodium hexafluorosilicate （SFS） flowers, grown on an ordered porous polystyrene film （OPPF）, were prepared via a synchronous dissolution/regrowth process. Their formation process can be divided into several steps： first, the dissolution of the silica spheres induced the crystallization of SFS onto the OPPF; second, some pores emerged on the closely packed bumps when being blown by the SiF4 gas; third, when the crystal was blown by continuous gas from the pores, the span of the top became larger than that of the bottom.展开更多
Highly uniform Ce（OH）CO3 flowers were successfully prepared in large quantities using a facile hydrothermal approach from the reaction of Ce（NH4）（NO3）4 with CO（NH2）2 at 160℃ in a water-N2H4 complex. The influ...Highly uniform Ce（OH）CO3 flowers were successfully prepared in large quantities using a facile hydrothermal approach from the reaction of Ce（NH4）（NO3）4 with CO（NH2）2 at 160℃ in a water-N2H4 complex. The influences of the N2H4 content and temperature on flower formation were discussed. CeO2 flowers were prepared by thermal conversion of Ce（OH）CO3 flowers at 500 ℃ in air. Both Ce（OH）CO3 and CeO2 flowers were characterized by X-ray powder diffraction （XRD）, and scanning electron microscopy （SEM）. The UV-vis adsorption spectrum of the CeO2 flowers showed that the band gap energy （Eg） is 2.66 eV, which is lower than that of bulk ceria.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51273056,21202091,5121010502,21074031)Postdoctoral Science Foundation Projects of China(No.2013M531008)Heilongjiang Provincial Department of Education(No.12521398)
文摘Hexagonal trumpet-like sodium hexafluorosilicate （SFS） flowers, grown on an ordered porous polystyrene film （OPPF）, were prepared via a synchronous dissolution/regrowth process. Their formation process can be divided into several steps： first, the dissolution of the silica spheres induced the crystallization of SFS onto the OPPF; second, some pores emerged on the closely packed bumps when being blown by the SiF4 gas; third, when the crystal was blown by continuous gas from the pores, the span of the top became larger than that of the bottom.
基金supported by a Grant-in-aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS)the CREST program of the Japan Science and Technology Agency(JST)+4 种基金the National Natural Science Foundation of China(No. 50873042,21001048),the Natural Science Foundation of Jiangsu Province(No.BK2009650)the High School Science Research Key Project of Jiangsu Province(11KJA430008)the High School Science Research Project of Jiangsu Province(No.11KJB150002)"Qing Lan Project" of the universities and colleges in Jiangsu Province
文摘Highly uniform Ce（OH）CO3 flowers were successfully prepared in large quantities using a facile hydrothermal approach from the reaction of Ce（NH4）（NO3）4 with CO（NH2）2 at 160℃ in a water-N2H4 complex. The influences of the N2H4 content and temperature on flower formation were discussed. CeO2 flowers were prepared by thermal conversion of Ce（OH）CO3 flowers at 500 ℃ in air. Both Ce（OH）CO3 and CeO2 flowers were characterized by X-ray powder diffraction （XRD）, and scanning electron microscopy （SEM）. The UV-vis adsorption spectrum of the CeO2 flowers showed that the band gap energy （Eg） is 2.66 eV, which is lower than that of bulk ceria.
