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Osmotically Driven Formation of Double Emulsions Stabilized by Amphiphilic Block Copolymers
Author(s) -
Bae Jinhye,
Russell Thomas P.,
Hayward Ryan C.
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201405229
Subject(s) - amphiphile , emulsion , copolymer , chemical engineering , yield (engineering) , materials science , solvent , salt (chemistry) , evaporation , chemistry , nanotechnology , organic chemistry , polymer , composite material , physics , engineering , thermodynamics
Double emulsions are valuable for the formation of multi‐compartmental structures. A variety of pathways to prepare double emulsions have been developed, but high‐throughput routes to droplets of controlled size and architecture remain scarce. A new single‐step process is introduced for preparation of water‐in‐oil‐in‐water double emulsions by a previously unexplained process of self‐emulsification. We show that the origin of this process is the osmotic stress resulting from the presence of salt impurities within the amphiphilic block copolymers used for emulsion stabilization. Further, we utilize osmotically driven emulsification to tailor the structures of multiple emulsions, which upon solvent evaporation can yield multi‐compartmental capsules or hierarchically structured porous films.