Journal
ACS NANO
Volume 2, Issue 9, Pages 1799-1806Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn800089z
Keywords
functional nanoparticle; Janus nanoparticle; magnetite (Fe(3)O(4)); self-assembly
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Funding
- Mitsubishi Chemical Corporation
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Janus nanoparticles have been synthesized consisting of similar to 5 nm magnetite nanoparticles coated on one side with a pH-dependent and temperature-independent polymer (poly(acrylic acid), PAA), and functionalized on the other side by a second (tail) polymer that is either a pH-independent polymer (polystyrene sodium sulfonate, PSSNa) or a temperature-dependent polymer (poly(N-isopropyl acrylamide), PNIPAM). These Janus nanoparticles are dispersed stably as individual particles at high pH values and low temperatures, but can self-assemble at low pH values (PSSNa) or at high temperatures (> 31 degrees C) (PNIPAM) to form stable dispersions of clusters of approximately 80-100 nm in hydrodynamic diameter. The Janus nanoparticle compositions were verified using FTIR and XPS, and their structures observed directly by TEM. Their clustering behavior is analyzed by dynamic light scattering and zeta potential measurements.
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