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Magnetic Decoupling of Surface Fe 3+ in Magnetite Nanoparticles upon Nitrocatechol‐Anchored Dispersant Binding
Author(s) -
Amstad Esther,
Fischer Håkon,
Gehring Andreas U.,
Textor Marcus,
Reimhult Erik
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201003504
Subject(s) - decoupling (probability) , nanoparticle , superparamagnetism , dispersant , ligand (biochemistry) , magnetite , nanotechnology , magnetite nanoparticles , chemistry , magnetic nanoparticles , computer science , materials science , magnetic field , physics , engineering , receptor , optics , dispersion (optics) , biochemistry , metallurgy , quantum mechanics , magnetization , control engineering
Bind and distort : NitroDOPA, an anchor shown to irreversibly couple dispersants and functional groups to superparamagnetic Fe 3 O 4 nanoparticles, can magnetically decouple Fe 3+ in a nanoparticle surface layer. The strong binding of nitroDOPA distorts the Fe 3+ ligand field. This ESR finding sheds light on an important binding mechanism of anchors used for nanoparticle surface modification (see graphic).