title: Electrical oscillation at a water/octanol interface in a hydrophobic container.
abstract: The electrical potential oscillation at and the shape of the water/octanol interface were investigated using hydrophobic fluoroplastic containers. The interfacial potential between a water solution containing 1.5 mM sodium dodecyl sulfate (SDS) and an octanol solution containing 5 mM tetrabutylammonium chloride oscillated with an amplitude of 50-100 mV. The potential oscillation was also observed using a transparent fluoroplastic tube. The water/octanol interface shape was unchanged and no interfacial flow was observed during the oscillation. The interface shape was convex toward the octanol phase for 1.5 mM SDS, meaning that SDS adsorption to the wall was suppressed by the hydrophobic container. Therefore, the octanol system in a hydrophobic container enabled us to elucidate the electrical oscillation without any influence from the wall effect.
authors.affiliation: Department of Chemical Engineering, 21COE Center for Practical Nano-Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
authors.forename: Takehito
authors.initials: T
authors.lastname: Ogawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shimazaki
authors.forename: Satoka
authors.initials: S
authors.lastname: Aoyagi
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Sakai