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- W2062621703 abstract "A dopant-free aerosol synthesis of highly crystalline TiO2 nanoparticles (20–35 nm) with tunable polymorphic content is demonstrated by rapid flame spray pyrolysis. By controlling precisely the total ambient oxygen partial pressure of the combustion in a quartz tube enclosure, anatase content as high as 96 wt% (4 wt% rutile) was obtained at high oxic flame conditions, while rutile content as high as 94 wt% (6 wt% anatase) was obtained under anoxic flames. The polymorphic variability lies within a narrow range of combustion equivalence ratios, that is, 1.0<Φ<1.5. Unlike any other flame aerosol syntheses, the anatase and rutile crystallite sizes were similar within each sample. Under highly oxic flame conditions (Φ<1.0), twinnings between anatase {0 1 1} planes could be observed, inferring oriented attachment taking place. Such mechanism could not, however, be seen under anoxic flame (Φ>1.0) possibly due to physical hindrance by surface carbonaceous content (typically <2 wt%). The carbon content can be easily removed by short calcination without significantly affecting the surface areas and crystallite properties of the original TiO2 nanocrystals, preserving hence its pristine state." @default.
- W2062621703 created "2016-06-24" @default.
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- W2062621703 date "2011-06-01" @default.
- W2062621703 modified "2023-09-27" @default.
- W2062621703 title "Dopant-free, polymorphic design of TiO2 nanocrystals by flame aerosol synthesis" @default.
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- W2062621703 doi "https://doi.org/10.1016/j.ces.2011.02.058" @default.
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