Building Supracolloidal Fibers from Zwitterion-Stabilized Adhesive Emulsions

Cristiam F. Santa Chalarca, Rachel A. Letteri, Antonio Perazzo, Howard A. Stone, Todd Emrick

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number1804325
JournalAdvanced Functional Materials
Volume28
Issue number45
DOIs
StatePublished - Nov 7 2018

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • adhesive emulsions
  • dipole–dipole interactions
  • emulsions gels
  • polymer zwitterions
  • supracolloidal materials

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