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Exchange Reactions at Mineral Interfaces

Thissen, Peter 1
1 Institut für Funktionelle Grenzflächen (IFG), Karlsruher Institut für Technologie (KIT)


Exchange reactions are a family of chemical reactions that appear when mineral surfaces come into contact with protic solvents. Exchange reactions can also be understood as a unique interaction at mineral interfaces. Particularly significant interactions occurring at mineral surfaces are those with water and CO$_{2}$. The rather complex process occurring when minerals such as calcium silicate hydrate (C–S–H) phases come into contact with aqueous environments is referred to as a metal–proton exchange reaction (MPER). This process leads to the leaching of calcium ions from the near-surface region, the first step in the corrosion of cement-bound materials. Among the various corrosion reactions of C–S–H phases, the MPER appears to be the most important one. A promising approach to bridging certain problems caused by MPER and carbonation is the passivation of C–S–H surfaces. Today, such passivation is reached, for instance, by the functionalization of C–S–H surfaces with water-repelling organic films. Unfortunately, these organic films are weak against temperature and especially weak against abrasion. Exchange reactions at mineral interfaces allow the preparation of intrinsic, hydrophobic surfaces of C–S–H phases just at room temperature via a metal–metal exchange reaction.

Postprint §
DOI: 10.5445/IR/1000127846
Veröffentlicht am 14.06.2022
DOI: 10.1021/acs.langmuir.0c01565
Zitationen: 8
Web of Science
Zitationen: 8
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2020
Sprache Englisch
Identifikator ISSN: 0743-7463, 1520-5827
KITopen-ID: 1000127846
HGF-Programm 34.15.01 (POF III, LK 01) Mineralische Konstruktionsmaterialien
Erschienen in Langmuir
Verlag American Chemical Society (ACS)
Band 36
Heft 35
Seiten 10293–10306
Vorab online veröffentlicht am 11.08.2020
Nachgewiesen in Dimensions
Web of Science
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