Reversible Clustering of pH- and Temperature-Responsive Janus Magnetic Nanoparticles
Janus nanoparticles have been synthesized consisting of ∼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 (polysty...
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| Veröffentlicht in: | ACS nano 2008-09, Vol.2 (9), p.1799-1806 |
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| creator | Isojima, Tatsushi Lattuada, Marco Vander Sande, John B Hatton, T. Alan |
| description | Janus nanoparticles have been synthesized consisting of ∼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 °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. |
| doi_str_mv | 10.1021/nn800089z |
| format | Article |
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Their clustering behavior is analyzed by dynamic light scattering and zeta potential measurements.</description><subject>Acrylic Resins - chemistry</subject><subject>Crystallization - methods</subject><subject>Hydrogen-Ion Concentration</subject><subject>Macromolecular Substances - chemistry</subject><subject>Magnetics</subject><subject>Materials Testing</subject><subject>Molecular Conformation</subject><subject>Nanostructures - chemistry</subject><subject>Nanostructures - ultrastructure</subject><subject>Nanotechnology - methods</subject><subject>Particle Size</subject><subject>Surface Properties</subject><subject>Temperature</subject><issn>1936-0851</issn><issn>1936-086X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNptkEFLw0AQhRdRbK0e_AOyFwUP0Z0ku8kepahVqkKp4C1Ms5OSkm7iblLQX2-kpV48zRv4ePA-xs5B3IAI4dbaVAiR6u8DNgQdqUCk6uNwnyUM2In3KyFkkibqmA1Ah0LFkA7ZfEYbcr5cVMTHVedbcqVd8rrgzSTgaA2f07ohh23nKJiRb2rryw3xZ7Sd5y-4tNSWOX9FWzfo-liRP2VHBVaeznZ3xN4f7ufjSTB9e3wa300DjBLdBgrQaEKIZAgxhlJpDcYoMAUkIkIZpf2j4wQkaSxipUkbo4scozxNjNTRiF1textXf3bk22xd-pyqCi3Vnc-UUokOtezB6y2Yu9p7R0XWuHKN7isDkf0qzPYKe_ZiV9ot1mT-yJ2zHrjcApj7bFV3zvYb_yn6AXhgeGs</recordid><startdate>20080923</startdate><enddate>20080923</enddate><creator>Isojima, Tatsushi</creator><creator>Lattuada, Marco</creator><creator>Vander Sande, John B</creator><creator>Hatton, T. 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Alan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Reversible Clustering of pH- and Temperature-Responsive Janus Magnetic Nanoparticles</atitle><jtitle>ACS nano</jtitle><addtitle>ACS Nano</addtitle><date>2008-09-23</date><risdate>2008</risdate><volume>2</volume><issue>9</issue><spage>1799</spage><epage>1806</epage><pages>1799-1806</pages><issn>1936-0851</issn><eissn>1936-086X</eissn><abstract>Janus nanoparticles have been synthesized consisting of ∼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 °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.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>19206418</pmid><doi>10.1021/nn800089z</doi><tpages>8</tpages></addata></record> |
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| subjects | Acrylic Resins - chemistry Crystallization - methods Hydrogen-Ion Concentration Macromolecular Substances - chemistry Magnetics Materials Testing Molecular Conformation Nanostructures - chemistry Nanostructures - ultrastructure Nanotechnology - methods Particle Size Surface Properties Temperature |
| title | Reversible Clustering of pH- and Temperature-Responsive Janus Magnetic Nanoparticles |
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