title: Influence of surfactant concentration and background salt on forced dynamic wetting and dewetting.
abstract: Forced wetting and dewetting of polymer surfaces in aqueous solutions containing cationic surfactant cetyltrimethylammonium bromide (CTAB) has been studied with a rotating cylinder half immersed in the solution. The receding contact angle decreases with faster withdrawing speeds. This decrease is enhanced when adding CTAB. The addition of salt to the CTAB solution further enhances the effect but does not have a significant effect alone. We interpret this change in the dynamic contact angle with a surfactant-induced Marangoni effect.
authors.affiliation: Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
authors.forename: Daniela
authors.initials: D
authors.lastname: Fell
authors.forename: Günter
authors.initials: G
authors.lastname: Auernhammer
authors.forename: Elmar
authors.initials: E
authors.lastname: Bonaccurso
authors.forename: Chuanjun
authors.initials: C
authors.lastname: Liu
authors.forename: Rudi
authors.initials: R
authors.lastname: Sokuler
authors.forename: Hans-Jürgen
authors.initials: HJ
authors.lastname: Butt