291864 Micromechanics of Anisotropic Partially Crystalline Emulsions

Monday, October 29, 2012
Hall B (Convention Center )
Alexandra V. Bayles, Chemical and Biomolecular Engineering, University of Delaware, Newark, DE

Advancements in the synthesis of anisotropic colloids enable complex fluid systems to be designed with responsive properties.  A capillary based micromanipulation technique is developed to produce approximately 100 μm anisotropic droplets from the dispersed oil phase of partially crystalline emulsions.  Particles produced through this method have distinct non-spherical features with characteristic length to width aspect ratios ranging from 1 to 10.  The particles demonstrate the ability to undergo sudden shape changes in response to changes in local interfacial tension and temperature.  During these deformation processes, the Laplace pressure acting at the oil - water interface imposes a stress on the semi-crystalline network within each particle.  When the imposed stress exceeds the critical stress of the crystalline material, the network yields and causes the particle to transition to a spherical shape.  A model for morphological stability relating internal stress distributions to the interfacial Laplace pressure is used to characterize this deformation.

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