Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 45, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201804325
Keywords
adhesive emulsions; dipole-dipole interactions; emulsions gels; polymer zwitterions; supracolloidal materials
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Funding
- National Science Foundation Center for Chemomechanical Assembly [NSF-CCI-1740630]
- Fulbright program
- Departamento Administrativo de Ciencia, Tecnologia e Innovacion de Colombia (COLCIENCIAS) through the scholarship Colciencias-Fulbright 2013
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Oil-in-water droplets stabilized with polymer zwitterions (PZWs) exhibit salt-responsive aggregation-disaggregation behavior. Here, a method to shape these droplets is described, starting from their aggregated state, into supracolloidal fibers by simply extruding them into aqueous media. The effect of salt concentration, in both the initial emulsion and the aqueous medium, on the ability of the emulsions to form fibers is examined. After fiber formation, a transition from well-defined macroscopic structures to noninteracting droplet dispersions can be triggered, simply by increasing the salt concentration of the aqueous environment. The interdroplet energy of adhesion and emulsion rheology correlate qualitatively with salt concentration and thus impact the ability of the emulsions to be shaped by extrusion. The interdroplet adhesion is dependent on both salt concentration and polymer composition, which allows tailoring of conditions to trigger fiber disaggregation. Finally, fibers with variable compositions along their length are prepared by sequential loading and extrusion of emulsions containing oil phases of differing densities.
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