title: Influence of coexisting phases on the surface dilatational viscosity of Langmuir monolayers.
abstract: Monolayer hydrodynamics are usually described in terms of a Newtonian constitutive relationship. However, this macroscopic view fails to account for small-scale coexisting phase domains, which are generally present in the monolayer and appear to have profound macroscopic effects. Here, we provide direct evidence of these effects, consisting of Brewster angle microscopy images of the monolayer, space- and time-resolved interfacial velocity measurements, and comparisons with predictions based on the Navier-Stokes equations together with the classic model for a Newtonian interface.
authors.affiliation: Department of Mathematics and Statistics, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: Juan M
authors.initials: JM
authors.lastname: Lopez
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Vogel
authors.forename: Amir H
authors.initials: AH
authors.lastname: Hirsa
mesh_terms: D003198:Computer Simulation; D008560:Membrane Fluidity; D008567:Membranes, Artificial; D008956:Models, Chemical; D044367:Phase Transition; D012031:Refractometry; D012212:Rheology / Q000379:methods*; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*; D014812:Vitamin K / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D013501:Surface-Active Agents; D014867:Water; D014812:Vitamin K