Effect of pH on the Water/{alpha}-Al{sub 2}O{sub 3} (1{bar 1}02) interface structure studied by sum-frequency vibrational spectroscopy

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Sum frequency vibrational spectroscopy (SFVS) was used to study the structure of water/{alpha}- Al{sub 2}O{sub 3} (1{bar 1}02 ) interfaces at different pH values. The OH stretch spectra are dominated by interfacial water contributions at lower frequencies, and by bonded hydroxyls on the Al{sub 2}O{sub 3} surface at higher frequencies. Protonation and deprotonation of various oxide functional groups at the {alpha}-Al{sub 2}O{sub 3} surface as pH varies can be monitored quantitatively by changes of the spectrum, allowing their pK reaction values can be estimated. The point of zero charge of the interface is found to be at pH ~ 6.7.

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Sung, J.; Zhang, L.; Tian, C.; Shen, Y. R. & Waychunas, G. A. August 1, 2011.

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Sum frequency vibrational spectroscopy (SFVS) was used to study the structure of water/{alpha}- Al{sub 2}O{sub 3} (1{bar 1}02 ) interfaces at different pH values. The OH stretch spectra are dominated by interfacial water contributions at lower frequencies, and by bonded hydroxyls on the Al{sub 2}O{sub 3} surface at higher frequencies. Protonation and deprotonation of various oxide functional groups at the {alpha}-Al{sub 2}O{sub 3} surface as pH varies can be monitored quantitatively by changes of the spectrum, allowing their pK reaction values can be estimated. The point of zero charge of the interface is found to be at pH ~ 6.7.

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13887

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  • Journal Name: Journal of Physical Chemistry C; Journal Volume: 115; Journal Issue: 28; Related Information: Journal Publication Date: 2011

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  • Report No.: LBNL-5398E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1021/jp2046596 | External Link
  • Office of Scientific & Technical Information Report Number: 1082181
  • Archival Resource Key: ark:/67531/metadc843137

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  • August 1, 2011

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  • May 19, 2016, 9:45 a.m.

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  • Sept. 29, 2017, 4:22 p.m.

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Sung, J.; Zhang, L.; Tian, C.; Shen, Y. R. & Waychunas, G. A. Effect of pH on the Water/{alpha}-Al{sub 2}O{sub 3} (1{bar 1}02) interface structure studied by sum-frequency vibrational spectroscopy, article, August 1, 2011; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc843137/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.