| Abstract
| - Monodisperse spherical polystyrene particles were suspended at the interface between decane andwater, and then subjected to extensional flow. Their lattice structure was observed to pass from a hexagonalarray at rest, through a liquidlike state as flow was first applied, and finally to a new semi-ordered,anisotropic state during steady flow. This semi-ordered state was shown to be oriented and stretched inthe flow direction relative to the original hexagonal structure. The influence of interfacial concentrationand extensional rate on particle dynamics is discussed.
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