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| 2. |
- Parekh, Kinnari, et al.
(författare)
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Ternary monodispersed Mn0.5Zn0.5Fe2O4 ferrite nanoparticles : preparation and magnetic characterization
- 2006
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Ingår i: Nanotechnology. - : IOP Publishing. - 0957-4484 .- 1361-6528. ; 17:24, s. 5970-5975
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Tidskriftsartikel (refereegranskat)abstract
- A ternary system of Mn0.5Zn0.5Fe2O4 has been synthesized for the first time using thermal decomposition of metal acetylacetonate in the presence of a high temperature boiling point solvent and fatty acids. Unlike the results of synthesis of this material by other techniques, we obtain nearly monodispersed nanoparticles, rendering them ideal for applications like in hyperthermia. The crystal structure and morphology of the particles obtained using x-ray diffraction (XRD) and transmission electron microscopy (TEM) are those of a single phase spinel structure with no other impurity phases. The particles are of 7 nm average diameter, with a very narrow (< 10%) size distribution. The oleic acid surfactant on the particles shows a 28% weight loss in thermo-gravimetric analyses (TGAs), which corresponds to a monolayer thickness of the coating. Magnetic measurements show the particles to be superparamagnetic with a characteristic blocking temperature of around 50 K.
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| 3. |
- Upadhyay, Ramesh V., et al.
(författare)
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Low-field DC-magnetization study of Ho3+-doped Mn-Zn ferrite ferrofluid
- 2007
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 311:1, s. 106-110
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Tidskriftsartikel (refereegranskat)abstract
- The physical and magnetic properties of magnetic nanoparticles are crucial for their effectiveness and reliability in biomedical applications. In this article, we report the synthesis of a stable Ho-substituted Mn-Zn ferrite ferrofluid and its physical and magnetic properties. Substitution by rare earth metal plays an important role in determining the magneto-crystalline anisotropy in 4f-3d intermetallic compounds. Ho3+ substitution not only enhanced the magnetic anisotropy but also produced strong spin frustration at low temperature. The field dependence of blocking temperature shows H-2/3 dependency in the entire range of field, i.e., 10-700 Oe, indicating the emergence of Ising spins characteristics in the present system.
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| 4. |
- Bulsara, V.N., et al.
(författare)
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Using spatial descriptors to identify damage initiation in NicalonTM/MAS-5
- 2006
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Ingår i: Proceedings of the American Society for Composites technical conference. - Lancaster : Technomic Publ. Co. - 1566764882 ; , s. 875-884
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Konferensbidrag (refereegranskat)abstract
- Quantitative microscopy in conjunction with finite element analysis is used to study the effects of fiber distribution on damage initiation in the transverse direction of a [0]8 NicalonTM/MAS-5 glass-ceramic composite. Fiber centroid locations in a transverse cross-section of the composite are collected and stored and used to evaluate the second order intensity function, K(r), and the radial distribution function g(r). The g(r) yields several representative volume elements (RVEs) of the composite, where each element represents one statistical realization of the actual fiber distribution. Potential damage initiation sites are identified by applying a simple failure criterion to the stress distribution in each RVE
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