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3981901 
Journal Article 
Adsorption of perfluorocarboxylic acids at the silica surface 
Shafique, U; Dorn, V; Paschke, A; Schüürmann, G 
2017 
Yes 
Chemical Communications
ISSN: 1359-7345
EISSN: 1364-548X 
53 
589-592 
English 
Water molecules may force the hydrophobic perfluoroalkyl chain of perfluorocarboxylic acids (PFCAs) to aggregate at hydrophobic siloxane patches ([triple bond, length as m-dash]Si-O-Si[triple bond, length as m-dash]) of the silica surface despite electrostatic repulsion between surface silanol ([triple bond, length as m-dash]SiO(-)) and the carboxylate (-COO(-)) headgroup of PFCA. Acidic pH and background cations promote the adsorption further by reducing the anion-anion Coulomb repulsion.