Trindade, Ana C.Canejo, João P.Patrício, PedroBrogueira, PedroTeixeira, Paulo I.Godinho, Maria Helena2013-01-022013-01-022012-11-07Trindade A C, Canejo J P, Patrício P, Brogueira P, Teixeira P I, Godinho M H. Hierarchical wrinkling on elastomeric Janus spheres. Journal of Materials Chemistry. 2012; 41 (22): 22044-22049.0959-9428http://hdl.handle.net/10400.21/2015Hierarchical 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 article