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Magnetic-Patchy Janus Colloid Surfactants for Reversible Recovery of Pickering Emulsions
Magnetic-Patchy Janus Colloid Surfactants for Reversible Recovery of Pickering Emulsions
- Source :
- ACS applied materialsinterfaces. 10(1)
- Publication Year :
- 2017
-
Abstract
- We present a straightforward and robust method for the synthesis of Janus colloid surfactants with distinct amphiphilicity and magnetic responsiveness. To this end, hydroxyl-functionalized amphiphilic Janus microparticles (JMPs) are synthesized by seeded monomer swelling and subsequent photopolymerization. By incorporating controlled amounts of hydroxyl groups on poly(styrene-co-vinyl alcohol) seed particles, we adjust the interfacial tension between the seed polymer and the poly(tetradecyl acrylate) secondary polymer (γ13). From theoretical and experimental observations, we verify that when γ13 is tuned to ∼8.5 mN/m in a medium with controlled solvency, which corresponds to a 0.6 volume fraction of ethanol in water, the particles bicompartmentalize to form oval or ellipsoidal JMPs with controllable bulb dimensions. We also show that bulb site-specific patching of magnetic nanoparticles (NPs) can be achieved using the electrostatic interaction between the polyethylenimine-coated bulb surface and the polyv...
- Subjects :
- Acrylate
Materials science
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Pickering emulsion
0104 chemical sciences
Surface tension
chemistry.chemical_compound
Colloid
Monomer
Photopolymer
chemistry
Chemical engineering
Magnetic nanoparticles
General Materials Science
Janus
0210 nano-technology
Subjects
Details
- ISSN :
- 19448252
- Volume :
- 10
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- ACS applied materialsinterfaces
- Accession number :
- edsair.doi.dedup.....a1e73926e695efe196a67ab8e92be410