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Magnetic-Patchy Janus Colloid Surfactants for Reversible Recovery of Pickering Emulsions

Title
Magnetic-Patchy Janus Colloid Surfactants for Reversible Recovery of Pickering Emulsions
Author
김진웅
Keywords
Janus microparticles; site-specific patching magnetic colloid surfactants; reversible recovery; Pickering emulsion
Issue Date
2018-01
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v. 10, no. 1, page. 1408-1414
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 (753). From theoretical and experimental observations, we verify that when gamma(13) is tuned to similar 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 polyvinylpyrrolidone-stabilized Fe2O3 NPs. Finally, we demonstrate that our magnetic-patchy JMPs can assemble at the oil water interface, enabling magnetic-responsive reversible recovery of Pickering emulsions.
URI
https://pubs.acs.org/doi/10.1021/acsami.7b15894http://repository.hanyang.ac.kr/handle/20.500.11754/117079
ISSN
1944-8244
DOI
10.1021/acsami.7b15894
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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