| Size and surface effects in the magnetic properties of maghemite and magnetite coated nanoparticles. | |
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MedLine Citation:
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PMID: 20732894 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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An increasing number of promising applications for future technology is arising from size constraints in nanoparticles (NPs) and from the chemical manipulation of their surfaces. In this work, we analyse the finite-size and surface effects on polyacrylic acid-coated Fe(3)O(4) NPs and oleic acid-coated gamma-Fe(2)O(3) NPs by studying their magnetization curves at different temperatures. The measured thermal dependence of the saturation magnetization is no longer explained by the typical T(3/2) Bloch law, yielding higher values than those expected for its exponent. When incorporated in polymeric matrixes to form magnetic transparent nanocomposites, the oleic acid-coated gamma-Fe(2)O(3) NPs also deviate from Bloch's law, but following the opposite trend observed in free coated NPs. |
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Authors:
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D Ortega; E Vélez-Fort; D A García; R García; R Litrán; C Barrera-Solano; M Ramírez-del-Solar; M Domínguez |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Philosophical transactions. Series A, Mathematical, physical, and engineering sciences Volume: 368 ISSN: 1364-503X ISO Abbreviation: Philos Transact A Math Phys Eng Sci Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-24 Completed Date: 2010-09-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101133385 Medline TA: Philos Transact A Math Phys Eng Sci Country: England |
Other Details:
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Languages: eng Pagination: 4407-18 Citation Subset: - |
Affiliation:
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The Davy-Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, UK. dortega@ri.ac.uk |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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