کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1798910 | 1524841 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of cobalt doping on the hyperthermic efficiency of magnetite nanoparticles
ترجمه فارسی عنوان
تأثیر دوپینگ کبالت بر بازده بالاگرایی نانوذرات مگنتیت
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کلمات کلیدی
هیپرترمی مایع مغناطیسی، نرخ جذب خاص، فریت کبالت، نانوذرات مغناطیسی، انیزوتروپ مغناطیسی،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
چکیده انگلیسی
Magnetite nanoparticles (NPs) are extensively investigated for biomedical applications, particularly as contrast agents for Magnetic Resonance Imaging and as heat mediators in Magnetic Fluid Hyperthermia. For the latter, one of the goal of the research is to obtain materials with improved hyperthermic properties. A valuable strategy is the increase of the magnetic anisotropy of commonly employed magnetite through the total or partial substitution of Fe2+ ions with Co2+ ions. Here we present a study on a family of 8Â nm Co-doped magnetite NPs (CoxFe3âxO4), with composition ranging from pure magnetite (x=0) to stoichiometric cobalt ferrite (x=1), aimed to investigate the evolution of the hyperthermic properties with the increase of Co content. We found that the addition of a small amount of Co is enough to sharply increase the Specific Absorption Rate (SAR). The SAR further increases with x but it reaches a maximum for an intermediate value (x=0.6). Such anomalous behavior is ascribed to the intrinsic magnetic properties of the material, and, in particular, to the magnetic anisotropy, which displays the same peculiar trend. The Co-doping thus may represent an effective strategy to improve the poor hyperthermic efficiency of very small magnetite NPs (<10Â nm).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 380, 15 April 2015, Pages 365-371
Journal: Journal of Magnetism and Magnetic Materials - Volume 380, 15 April 2015, Pages 365-371
نویسندگان
Elvira Fantechi, Claudia Innocenti, Martin Albino, Elisabetta Lottini, Claudio Sangregorio,