Oil-water reflectivity measurements for understanding polymer stabilization of multiple emulsions
Copolymers of poly(styrene)-s-poly(daema) have been shown to be stimulable emulsion stabilizers by action of pH or temperature. They are also promoters of multiple emulsions that are very stable over time. This promotion is intimately linked to a measured minimum in the surface tension between water and oil as a function of pH. The position of this minimum and the whole behavior of surface tension is very dependent of polymer architecture. There is then a strong need of quantitative information on the polymer conformation at oil-water interface as a function of polymer nature. We propose to get such a knowledge thanks to reflectivity measurement at the oil-water interface. A dedicated microfluidic cell was built, enclosing the fluid of thickness about 200 micrometers and anchoring a flat centimetric meniscus. The neutron beam will be collected after travelling through a sapphire window and reflecting onto the interface.
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GUENOUN; BESNARD Lucie; DAILLANT Jean; FRAGNETO Giovanna; MALLOGGI Florent; PANTOUSTIER Nadege; PERRIN Patrick and WATKINS Erik. (2013). Oil-water reflectivity measurements for understanding polymer stabilization of multiple emulsions. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1644
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