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- Dominic Vella, Amin Ajdari, Ashkan Vaziri, Arezki Boudaoud
- Journal of the Royal Society, Interface
- 2012

Pressurized elastic capsules arise at scales ranging from the 10 m diameter pressure vessels used to store propane at oil refineries to the microscopic polymeric capsules that may be used in drug delivery. Nature also makes extensive use of pressurized elastic capsules: plant cells, bacteria and fungi have stiff walls, which are subject to an internal… (More)

- Dominic Vella, José Bico, Arezki Boudaoud, Benoit Roman, Pedro M Reis
- Proceedings of the National Academy of Sciences…
- 2009

The wrinkling and delamination of stiff thin films adhered to a polymer substrate have important applications in "flexible electronics." The resulting periodic structures, when used for circuitry, have remarkable mechanical properties because stretching or twisting of the substrate is mostly accommodated through bending of the film, which minimizes fatigue… (More)

– We study the collective behaviour of a close packed monolayer of non-Brownian particles at a fluid-liquid interface. Such a particle raft forms a two-dimensional elastic solid and can support anisotropic stresses and strains, e.g. it buckles in uniaxial compression and cracks in tension. We characterise this solid in terms of a Young's modulus and Poisson… (More)

- Dominic Vella, Duck-Gyu Lee, Ho-Young Kim
- Langmuir : the ACS journal of surfaces and…
- 2006

We consider the equilibrium flotation of a two-dimensional cylinder and a sphere at an interface between two fluids. We give conditions on the density and radius of these objects for them to be able to float at the interface and discuss the role played by the contact angle in determining these conditions. For cylinders with a small radius, we find that the… (More)

- Benny Davidovitch, Robert D Schroll, Dominic Vella, Mokhtar Adda-Bedia, Enrique A Cerda
- Proceedings of the National Academy of Sciences…
- 2011

The buckling and wrinkling of thin films has recently seen a surge of interest among physicists, biologists, mathematicians, and engineers. This activity has been triggered by the growing interest in developing technologies at ever-decreasing scales and the resulting necessity to control the mechanics of tiny structures, as well as by the realization that… (More)

- Dominic Vella, Duck-Gyu Lee, Ho-Young Kim
- Langmuir : the ACS journal of surfaces and…
- 2006

We study the sinking of a dense cylinder initially supported horizontally at an air-water interface and then released. The sinking motion is studied experimentally and agrees quantitatively with a simple hydrodynamic model of the process. In particular, our model predicts that the time taken for the cylinder to become immersed in the liquid should be tsink… (More)

Objects that float at the interface between a liquid and a gas interact because of interfacial deformation and the effect of gravity. We highlight the crucial role of buoyancy in this interaction, which, for small particles, prevails over the capillary suction that often is assumed to be the dominant effect. We emphasize this point using a simple classroom… (More)

- Dominic Vella, Amin Ajdari, Ashkan Vaziri, Arezki Boudaoud
- Physical review letters
- 2011

We study the formation of localized structures formed by the point loading of an internally pressurized elastic shell. While unpressurized shells (such as a ping-pong ball) buckle into polygonal structures, we show that pressurized shells are subject to a wrinkling instability. We study wrinkling in depth, presenting scaling laws for the critical… (More)

- Dominic Vella
- Langmuir : the ACS journal of surfaces and…
- 2008

We consider the equilibrium flotation of a thin, flexible cylinder at the interface between a liquid and a gas. In particular, we determine the maximum load that such a cylinder can support without sinking. We find that as the length of such a cylinder increases the maximum load at first increases. However, the maximum load reaches a plateau when the length… (More)

- Dominic Vella, Amin Ajdari, Ashkan Vaziri, Arezki Boudaoud
- Physical review letters
- 2012

Thin shells are found in nature at scales ranging from viruses to hens' eggs; the stiffness of such shells is essential for their function. We present the results of numerical simulations and theoretical analyses for the indentation of ellipsoidal and cylindrical elastic shells, considering both pressurized and unpressurized shells. We provide a theoretical… (More)