Spatial cooperativity in soft glassy flows

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Reference

Goyon, J., Colin, A., Ovarlez, G., Ajdari, A., Bocquet, L., Nature 454 (2008).

Keywords

spatial cooperativity, glass, velocity profile, shear stress, shear strain, Couette cell

Summary

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This paper deals with studying non-local effects at and above the glass transition in an emulsion. A general feature of glassy materials is a strong nonlinear flow rule relating stress and strain. This feature is no well-documented and poorly understood. The authors develop a law governing flows of glassy materials, using a local velocity measurement technique to measure the local flow of a film of confined glassy material.