Compression Causes Expansion | Materials and Mechanics

Surface tension compresses a water droplet and equivalently the effect of surface stress is to decrease the lattice parameter in metal particles. The effect of surface stress and elastic properties like Poisson’s ratio can be accentuated in lower dimensional systems like metal nanoparticles. The I.I.T. Kanpur team, using a two scale computational method and transmission electron microscopy, not only show a lattice expansion due to purely surface stress effects in a metallic system, but also discover anomalous lattice expansion in the case of very thin walled in metal nanoshells. This…

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