Trindade, Ana C.Canejo, JoãoPatricio, PedroBrogueira, PedroTeixeira, PauloGodinho, Maria Helena2015-09-102015-09-102012-11-07TRINDADE, Ana C.; [et al] – Hierarchical wrinkling on elastometric Janus spheres. Journal of Materials Chemistry. ISSN: 0959-9428. Vol. 22, nr. 41 (2012), pp. 22044-220490959-9428http://hdl.handle.net/10400.21/5151Hierarchical wrinkling on elastomeric Janus spheres is permanently imprinted by swelling, for different lengths of time, followed by drying the particles in an appropriate solvent. First-order buckling with a spatial periodicity (lambda(11)) of the order of a few microns and hierarchical structures comprising of 2nd order buckling with a spatial periodicity (lambda(12)) of the order of hundreds of nanometers have been obtained. The 2nd order buckling features result from a Grinfeld surface instability due to the diffusion of the solvent and the presence of sol molecules.engSoft MatterParticlesPolymerizationPatternsEmulsionSurfaceMicrospheresInstabilityNanoprobesInterfacesjournal article10.1039/c2jm35018a