Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 10, Pages 1377-1380Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2009.02.134
Keywords
Nanoparticle; Iron oxide; pNIPAAm; Biomedical application; Triggered drug delivery; Temperature-sensitive behavior
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Ferromagnetic iron oxide nanoparticles of about 33 nm in diameter were synthesized by high-temperature decomposition of an iron-oleate complex, using octadecene as the solvent. These particles were subsequently coated with polyN-isopropylacrylamide (pNIPAAm) by a surfactant exchange method. Temperature-sensitive behavior of these particles was studied using ac susceptibility and dynamic light scattering (DLS) measurements. Shifts in the imaginary part of the ac susceptibility are correlated with swelling and collapse of pNIPAAm as a function of temperature. (C) 2009 Elsevier B.V. All rights reserved.
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