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Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces
The energy and electron transfer reactions of anthracene co-adsorbed with an electron donor on silica gel and titania-silica mixed oxides have been studied by a combination of steady state reflectance, emission spectroscopy, and nanosecond diffuse reflectance laser flash photolysis. Bimolecular rate...
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| Main Authors: | , , , |
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| Format: | Default Article |
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2019
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| Online Access: | https://hdl.handle.net/2134/37376 |
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| _version_ | 1818168653554647040 |
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| author | Anisoara Vancea Iain Kirkpatrick David Worrall Sian L. Williams |
| author_facet | Anisoara Vancea Iain Kirkpatrick David Worrall Sian L. Williams |
| author_sort | Anisoara Vancea (7122659) |
| collection | Figshare |
| description | The energy and electron transfer reactions of anthracene co-adsorbed with an electron donor on silica gel and titania-silica mixed oxides have been studied by a combination of steady state reflectance, emission spectroscopy, and nanosecond diffuse reflectance laser flash photolysis. Bimolecular rate constants for energy and electron transfer between anthracene and azulene have been measured; kinetic analysis of the decay of the anthracene triplet state and radical cation show that the kinetic parameters depend on the titania content of the sample and the azulene loading. The rate of energy and electron transfer reactions increases as a function of azulene loading and decreases with increasing titania content in titania-silica mixed oxides. These findings indicate that the observed rate of reaction is determined by the rate of diffusion of anthracene on the titania-silica surfaces whereas, in contrast, the observed rate of reaction on silica gel is predominantly governed by the rate of diffusion of azulene. |
| format | Default Article |
| id | rr-article-9226130 |
| institution | Loughborough University |
| publishDate | 2019 |
| record_format | Figshare |
| spelling | rr-article-92261302019-07-02T00:00:00Z Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces Anisoara Vancea (7122659) Iain Kirkpatrick (1259919) David Worrall (1249377) Sian L. Williams (7122662) Other chemical sciences not elsewhere classified Silica Titania Photocatalysis Energy / electron transfer Diffusion Reflectance Chemical Sciences not elsewhere classified The energy and electron transfer reactions of anthracene co-adsorbed with an electron donor on silica gel and titania-silica mixed oxides have been studied by a combination of steady state reflectance, emission spectroscopy, and nanosecond diffuse reflectance laser flash photolysis. Bimolecular rate constants for energy and electron transfer between anthracene and azulene have been measured; kinetic analysis of the decay of the anthracene triplet state and radical cation show that the kinetic parameters depend on the titania content of the sample and the azulene loading. The rate of energy and electron transfer reactions increases as a function of azulene loading and decreases with increasing titania content in titania-silica mixed oxides. These findings indicate that the observed rate of reaction is determined by the rate of diffusion of anthracene on the titania-silica surfaces whereas, in contrast, the observed rate of reaction on silica gel is predominantly governed by the rate of diffusion of azulene. 2019-07-02T00:00:00Z Text Journal contribution 2134/37376 https://figshare.com/articles/journal_contribution/Energy_and_electron_transfer_reactions_on_silica_gel_and_titania-silica_mixed_oxide_surfaces/9226130 CC BY 4.0 |
| spellingShingle | Other chemical sciences not elsewhere classified Silica Titania Photocatalysis Energy / electron transfer Diffusion Reflectance Chemical Sciences not elsewhere classified Anisoara Vancea Iain Kirkpatrick David Worrall Sian L. Williams Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces |
| title | Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces |
| title_full | Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces |
| title_fullStr | Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces |
| title_full_unstemmed | Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces |
| title_short | Energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces |
| title_sort | energy and electron transfer reactions on silica gel and titania-silica mixed oxide surfaces |
| topic | Other chemical sciences not elsewhere classified Silica Titania Photocatalysis Energy / electron transfer Diffusion Reflectance Chemical Sciences not elsewhere classified |
| url | https://hdl.handle.net/2134/37376 |