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Synthesis and Magneto-Thermal Actuation of Iron Oxide Core-PNIPAM Shell Nanoparticles.

Kurzhals S, Zirbs R, Reimhult E - ACS Appl Mater Interfaces (2015)

Bottom Line: Superparamagnetic nanoparticles have been proposed for many applications in biotechnology and medicine.Thereafter, it is shown that local heating by magnetic fields as well as global thermal heating can be used to efficiently and reversibly aggregate, magnetically extract nanoparticles from solution and spontaneously redisperse them.The coupling of magnetic and thermally responsive properties points to novel uses as smart materials, for example, in integrated devices for molecular separation and extraction.

View Article: PubMed Central - PubMed

Affiliation: Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna , Muthgasse 11, A-1190 Vienna, Austria.

ABSTRACT
Superparamagnetic nanoparticles have been proposed for many applications in biotechnology and medicine. In this paper, it is demonstrated how the excellent colloidal stability and magnetic properties of monodisperse and individually densely grafted iron oxide nanoparticles can be used to manipulate reversibly the solubility of nanoparticles with a poly(N-isopropylacrylamide)nitrodopamine shell. "Grafting-to" and "grafting-from" methods for synthesis of an irreversibly anchored brush shell to monodisperse, oleic acid coated iron oxide cores are compared. Thereafter, it is shown that local heating by magnetic fields as well as global thermal heating can be used to efficiently and reversibly aggregate, magnetically extract nanoparticles from solution and spontaneously redisperse them. The coupling of magnetic and thermally responsive properties points to novel uses as smart materials, for example, in integrated devices for molecular separation and extraction.

No MeSH data available.


Synthesis of Surface Binding Initiator 4 and “Grafting-from” Polymerization of N-Isopropylacrylamide(a) KOH, (b) 2-methyl-2-bromopropionylbromide, triethylamine, (c) N-hydroxysuccinimide,6-nitrodopamine hydrogensulfate, triethylamine, (d) ligand exchangereaction, (e) SI-ATRP of N-isopropylacrylamide.
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sch2: Synthesis of Surface Binding Initiator 4 and “Grafting-from” Polymerization of N-Isopropylacrylamide(a) KOH, (b) 2-methyl-2-bromopropionylbromide, triethylamine, (c) N-hydroxysuccinimide,6-nitrodopamine hydrogensulfate, triethylamine, (d) ligand exchangereaction, (e) SI-ATRP of N-isopropylacrylamide.


Synthesis and Magneto-Thermal Actuation of Iron Oxide Core-PNIPAM Shell Nanoparticles.

Kurzhals S, Zirbs R, Reimhult E - ACS Appl Mater Interfaces (2015)

Synthesis of Surface Binding Initiator 4 and “Grafting-from” Polymerization of N-Isopropylacrylamide(a) KOH, (b) 2-methyl-2-bromopropionylbromide, triethylamine, (c) N-hydroxysuccinimide,6-nitrodopamine hydrogensulfate, triethylamine, (d) ligand exchangereaction, (e) SI-ATRP of N-isopropylacrylamide.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4559841&req=5

sch2: Synthesis of Surface Binding Initiator 4 and “Grafting-from” Polymerization of N-Isopropylacrylamide(a) KOH, (b) 2-methyl-2-bromopropionylbromide, triethylamine, (c) N-hydroxysuccinimide,6-nitrodopamine hydrogensulfate, triethylamine, (d) ligand exchangereaction, (e) SI-ATRP of N-isopropylacrylamide.
Bottom Line: Superparamagnetic nanoparticles have been proposed for many applications in biotechnology and medicine.Thereafter, it is shown that local heating by magnetic fields as well as global thermal heating can be used to efficiently and reversibly aggregate, magnetically extract nanoparticles from solution and spontaneously redisperse them.The coupling of magnetic and thermally responsive properties points to novel uses as smart materials, for example, in integrated devices for molecular separation and extraction.

View Article: PubMed Central - PubMed

Affiliation: Institute for Biologically Inspired Materials, Department of Nanobiotechnology, University of Natural Resources and Life Sciences, Vienna , Muthgasse 11, A-1190 Vienna, Austria.

ABSTRACT
Superparamagnetic nanoparticles have been proposed for many applications in biotechnology and medicine. In this paper, it is demonstrated how the excellent colloidal stability and magnetic properties of monodisperse and individually densely grafted iron oxide nanoparticles can be used to manipulate reversibly the solubility of nanoparticles with a poly(N-isopropylacrylamide)nitrodopamine shell. "Grafting-to" and "grafting-from" methods for synthesis of an irreversibly anchored brush shell to monodisperse, oleic acid coated iron oxide cores are compared. Thereafter, it is shown that local heating by magnetic fields as well as global thermal heating can be used to efficiently and reversibly aggregate, magnetically extract nanoparticles from solution and spontaneously redisperse them. The coupling of magnetic and thermally responsive properties points to novel uses as smart materials, for example, in integrated devices for molecular separation and extraction.

No MeSH data available.