Growth Mechanisms of Nanostructured Titania in Turbulent Reacting Flows
Titanium dioxide (titania) is used in chemical sensors, pigments, and paints and holds promise as an antimicrobial agent. This is due to its photoinduced activity and, in nanostructured form, its high specific surface area. Particle size and surface area result from the interplay of fluid, chemical,...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2015-01-01
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| Series: | Journal of Nanotechnology |
| Online Access: | http://dx.doi.org/10.1155/2015/642014 |
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| Summary: | Titanium dioxide (titania) is used in chemical sensors, pigments, and paints and
holds promise as an antimicrobial agent. This is due to its photoinduced activity and,
in nanostructured form, its high specific surface area. Particle size and surface area
result from the interplay of fluid, chemical, and thermal dynamics as well as nucleation,
condensation and coagulation. After nucleation, condensation, and coagulation are
the dominant phenomena affecting the particle size distribution. Manufacture of nanostructured titania via gas-phase synthesis often occurs under turbulent flow conditions.
This study examines the competition between coagulation and condensation in the
growth of nanostructured titania. Direct numerical simulation is utilized in simulating
the hydrolysis of titanium tetrachloride to produce titania in a turbulent, planar jet.
The fluid, chemical, and particle fields are resolved as a function of space and time.
As a result, knowledge of titania is available as a function of space, time, and phase
(vapor or particle), facilitating the analysis of the particle dynamics by mechanism.
Results show that in the proximal region of the jet nucleation and condensation are
the dominant mechanisms. However once the jet potential core collapses and turbulent
mixing begins, coagulation is the dominant mechanism. The data also shows that the
coagulation growth-rate is as much as twice the condensation growth-rate. |
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| ISSN: | 1687-9503 1687-9511 |