title: Mechanical Stability of Polystyrene and Janus Particle Monolayers at the Air/Water Interface.
abstract: The compressional instability of particle-laden air/water interfaces is investigated with plain and surface-anisotropic (Janus) particles. We hypothesize that the amphiphilic nature of Janus particles leads to both anisotropic particle-particle and particle-interface interactions that can yield particle films with unique collapse mechanisms. Analysis of Langmuir isotherms and microstructural characterization of the homogeneous polystyrene particle films during compression reveal an interfacial buckling instability followed by folding, which is in good agreement with predictions from classical elasticity theory. In contrast, Janus particle films exhibit a different behavior during compression, where the collapse mode occurs through the subduction of the Janus particle film. Our results suggest that particle-laden films comprised of surface-anisotropic particles can be engineered to evolve new material properties.
authors.affiliation: Department of Chemical Engineering, City College of City University of New York , New York, New York 10031, United States.|Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago , Chicago, Illinois 60637, United States.
authors.forename: Jessica
authors.initials: J
authors.lastname: Lenis
authors.affiliation: Department of Chemical Engineering, City College of City University of New York , New York, New York 10031, United States.
authors.forename: Sepideh
authors.initials: S
authors.lastname: Razavi
authors.affiliation: Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago , Chicago, Illinois 60637, United States.
authors.forename: Kathleen D
authors.initials: KD
authors.lastname: Cao
authors.affiliation: James Franck Institute and Center for Advanced Radiation Sources, The University of Chicago , Chicago, Illinois 60637, United States.
authors.forename: Binhua
authors.initials: B
authors.lastname: Lin
authors.affiliation: Department of Chemistry, Institute for Biophysical Dynamics, and James Franck Institute, The University of Chicago , Chicago, Illinois 60637, United States.
authors.forename: Ka Yee C
authors.initials: KY
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, City College of City University of New York , New York, New York 10031, United States.
authors.forename: Raymond S
authors.initials: RS
authors.lastname: Tu
authors.affiliation: Department of Chemical Engineering, City College of City University of New York , New York, New York 10031, United States.
authors.forename: Ilona
authors.initials: I
authors.lastname: Kretzschmar