کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1804346 1024647 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Brownian rotational relaxation and power absorption in magnetite nanoparticles
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Brownian rotational relaxation and power absorption in magnetite nanoparticles
چکیده انگلیسی

We present a study of the power absorption efficiency in several magnetite-based colloids, to asses their potential as magnetic inductive hyperthermia (MIH) agents. Relaxation times ττ were measured through the imaginary susceptibility component χ″(T)χ″(T), and analyzed within Debye's theory of dipolar fluid. The results indicated Brownian rotational relaxation and allowed to calculate the hydrodynamic radius close to the values obtained from photon correlation. The study of the colloid performances as power absorbers showed no detectable increase of temperature for dextran-coated Fe3O4 nanoparticles, whereas a second Fe3O4-based dispersion of similar concentration could be heated up to 12 K after 30 min under similar experimental conditions. The different power absorption efficiencies are discussed in terms of the magnetic structure of the nanoparticles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 316, Issue 2, September 2007, Pages 132–135
نویسندگان
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