Surface chemistry of cement pastes: a study by x-ray photoelectron spectroscopy
| Autor: | Karim Benzarti, Simon Hutton, Mohamed M. Chehimi, Victor Oliva, Carole Connan, Bechir Mrabet, Maria Inês Baeta Neves, Adam Roberts, Michel Delamar |
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| Rok vydání: | 2002 |
| Předmět: |
Cement
Chemistry Scanning electron microscope chemistry.chemical_element macromolecular substances Surfaces and Interfaces General Chemistry Epoxy engineering.material Condensed Matter Physics Surface energy Surfaces Coatings and Films Coating X-ray photoelectron spectroscopy Chemical engineering visual_art Materials Chemistry engineering visual_art.visual_art_medium Organic chemistry Lewis acids and bases Carbon |
| Zdroj: | Surface and Interface Analysis. 33:834-841 |
| ISSN: | 1096-9918 0142-2421 |
| Popis: | Two cement pastes commonly used in concrete formulations were characterized by XPS before and after coating with an epoxy resin and a hardener. The XPS allowed the surface chemistry change induced by the organic coating to be monitored. In particular, the C 1s spectra were peak fitted in order to deduce the contribution of the organic materials to the total carbon content on the surface. Inspection of the N 1s peak at the cement/hardener interface indicates a certain degree of donor-acceptor interaction, where the aminated hardener plays the role of the Lewis base (donor) and the cement acts as the Lewis acid. A relationship has been established between the dispersive contribution to the surface free energy (γ S d) of the cement pastes and the surface chemical composition. A substantial decrease in the surface energy (from 65 to ∼30 mJ m -2 ) of the materials has been observed for a higher surface content in organic materials or, alternatively, for a more homogeneous organic coating even at a lower mass loading of the resin or hardener. |
| Databáze: | OpenAIRE |
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