title: Surface impurities are not responsible for the charge on the oil/water interface: a comment.
abstract: The origin of the charge on oil/water interfaces that can be found from electrokinetic mobility measurements is a long-standing issue that has invoked different explanations. Sum frequency scattering (SFS) shows that impurities are likely not a general cause for the charge.
authors.forename: Kailash C
authors.initials: KC
authors.lastname: Jena
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Scheu
authors.forename: Sylvie
authors.initials: S
authors.lastname: Roke