Interfacial Polymerization on Dynamic Complex Colloids

Creating Stabilized Janus Droplets

Yuan He, Suchol Savagatrup, Lauren Dell Zarzar, Timothy M. Swager

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Complex emulsions, including Janus droplets, are becoming increasingly important in pharmaceuticals and medical diagnostics, the fabrication of microcapsules for drug delivery, chemical sensing, E-paper display technologies, and optics. Because fluid Janus droplets are often sensitive to external perturbation, such as unexpected changes in the concentration of the surfactants or surface-active biomolecules in the environment, stabilizing their morphology is critical for many real-world applications. To endow Janus droplets with resistance to external chemical perturbations, we demonstrate a general and robust method of creating polymeric hemispherical shells via interfacial free-radical polymerization on the Janus droplets. The polymeric hemispherical shells were characterized by optical and fluorescence microscopy, scanning electron microscopy, and confocal laser scanning microscopy. By comparing phase diagrams of a regular Janus droplet and a Janus droplet with the hemispherical shell, we show that the formation of the hemispherical shell nearly doubles the range of the Janus morphology and maintains the Janus morphology upon a certain degree of external perturbation (e.g., adding hydrocarbon-water or fluorocarbon-water surfactants). We attribute the increased stability of the Janus droplets to (1) the surfactant nature of polymeric shell formed and (2) increase in interfacial tension between hydrocarbon and fluorocarbon due to polymer shell formation. This finding opens the door of utilizing these stabilized Janus droplets in a demanding environment.

Original languageEnglish (US)
Pages (from-to)7804-7811
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number8
DOIs
StatePublished - Mar 1 2017

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Colloids
Polymerization
Surface-Active Agents
Fluorocarbons
Surface active agents
Hydrocarbons
Water
Fluorescence microscopy
Biomolecules
Free radical polymerization
Emulsions
Drug delivery
Drug products
Phase diagrams
Optical microscopy
Capsules
Surface tension
Optics
Microscopic examination
Polymers

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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abstract = "Complex emulsions, including Janus droplets, are becoming increasingly important in pharmaceuticals and medical diagnostics, the fabrication of microcapsules for drug delivery, chemical sensing, E-paper display technologies, and optics. Because fluid Janus droplets are often sensitive to external perturbation, such as unexpected changes in the concentration of the surfactants or surface-active biomolecules in the environment, stabilizing their morphology is critical for many real-world applications. To endow Janus droplets with resistance to external chemical perturbations, we demonstrate a general and robust method of creating polymeric hemispherical shells via interfacial free-radical polymerization on the Janus droplets. The polymeric hemispherical shells were characterized by optical and fluorescence microscopy, scanning electron microscopy, and confocal laser scanning microscopy. By comparing phase diagrams of a regular Janus droplet and a Janus droplet with the hemispherical shell, we show that the formation of the hemispherical shell nearly doubles the range of the Janus morphology and maintains the Janus morphology upon a certain degree of external perturbation (e.g., adding hydrocarbon-water or fluorocarbon-water surfactants). We attribute the increased stability of the Janus droplets to (1) the surfactant nature of polymeric shell formed and (2) increase in interfacial tension between hydrocarbon and fluorocarbon due to polymer shell formation. This finding opens the door of utilizing these stabilized Janus droplets in a demanding environment.",
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Interfacial Polymerization on Dynamic Complex Colloids : Creating Stabilized Janus Droplets. / He, Yuan; Savagatrup, Suchol; Zarzar, Lauren Dell; Swager, Timothy M.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 8, 01.03.2017, p. 7804-7811.

Research output: Contribution to journalArticle

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