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  Insights into Silica Bilayer Hydroxylation and Dissolution

Kaden, W., Pomp, S., Sterrer, M., & Freund, H.-J. (2017). Insights into Silica Bilayer Hydroxylation and Dissolution. Topics in Catalysis, 60(6-7), 471-480. doi:10.1007/s11244-016-0715-7.

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 Creators:
Kaden, William1, 2, Author              
Pomp, Sascha1, 3, Author              
Sterrer, Martin1, 3, Author              
Freund, Hans-Joachim1, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Department of Physics, University of Central Florida, 4111 Libra Drive, Physical Sciences Building 308, Orlando, FL 32816, USA, ou_persistent22              
3Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria, ou_persistent22              

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 Abstract: Hydroxylation and dissolution of well-structured silica bilayer films grown on a ruthenium single-crystal support (SiO2/Ru(0001)) was studied by temperature programmed desorption and X-ray photoelectron spectroscopy (XPS). Water desorption signals from SiO2/Ru(0001) hydroxylated by electron-bombardment of adsorbed ice at 100 K were found to be comparable to those of hydroxylated bulk silica samples and attributed to adsorbed molecular water and silanol groups (vicinal and terminal). Isotopic exchange between 18O-labeled SiO2 and 16O-labeled water suggests the occurrence of dynamic siloxane bond cleavage and re-formation during electron bombardment. Together with the observed strong dependence of hydroxylation activity on ice coverage, which is found to increase with increasing thickness of the ice layer, a hydroxylation mechanism based on the activation of siloxane bonds by water radiolysis products (e.g. hydroxyls) and subsequent water dissociation is proposed. Dissolution rates obtained from the attenuation of Si 2p and O1s XPS signal intensities upon exposure of bilayer SiO2/ Ru(0001) to alkaline conditions at various temperatures are in agreement with the proposed rate model for bulk silica dissolution by OH- attack and provide further corroboration of the proposed hydroxylation mechanism.

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Language(s): eng - English
 Dates: 2016-11-012017-05
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s11244-016-0715-7
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Project name : STRUBOLI - Structure and Bonding at Oxide-Liquid Interfaces
Grant ID : 280070
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Topics in Catalysis
  Other : Top. Catal.
Source Genre: Journal
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Publ. Info: New York : Springer
Pages: 10 Volume / Issue: 60 (6-7) Sequence Number: - Start / End Page: 471 - 480 Identifier: ISSN: 1022-5528
CoNE: https://pure.mpg.de/cone/journals/resource/954925584249