title: Self-assembled triangular and labyrinth buckling patterns of thin films on spherical substrates.
abstract: We investigated the possibility of controlling thin film buckling patterns by varying the substrate curvature and the stress induced therein upon cooling. The numerical and experimental studies are based on a spherical Ag core/SiO(2) shell system. For Ag substrates with a relatively larger curvature, the dentlike triangular buckling pattern comes out when the film nominal stress exceeds a critical value. With increasing film stress and/or substrate radius, the labyrinthlike buckling pattern takes over. Both the buckling wavelength and the critical stress increase with the substrate radius.
authors.affiliation: Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027-6699, USA.
authors.forename: Guoxin
authors.initials: G
authors.lastname: Cao
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Chaorong
authors.initials: C
authors.lastname: Li
authors.forename: Ailing
authors.initials: A
authors.lastname: Ji
authors.forename: Zexian
authors.initials: Z
authors.lastname: Cao