| http://www.w3.org/ns/prov#value | - The fluorinated surfactants used have the general formula Rf R Y X, where Rf is a perfluoroalkyl group or a perfluoroalkylether group with carbon number from 1 to 15 and preferably from 6 to 9 and R is for example an alkylene group or an alkylene thioether (--CH2 --S--CH2 --) linkage with carbon number from 0 to 4.
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