Read e-book online Magnetic Nanoparticles: A Study by Synchrotron Radiation and PDF

By Adriana I. Figueroa

Magnetic nanoparticles (NPs) are discovering their position in lots of smooth applied sciences resembling electronics (memory or spintronic units) and drugs (contrast media, electromagnetic thermal remedy) to call quite a few examples. the applying of contemporary ideas in accordance with synchrotron radiation, specifically X-ray spectroscopies, in addition to an rf transverse susceptibility probe, outfitted advert hoc, allowed the writer to enquire numerous sessions of magnetic NPs with different purposes. for instance, the fascinating anisotropic homes of CoW and CoPt NPs published new magnetic behaviour and levels. Gold NPs ready on a organic template from Sulfolobus acidocaldarius S-layer, have been proven to own intrinsic magnetism because of the electron alternate with the sulfur atoms of the template. Silica and oleic acid covered magnetite NPs confirmed very good human compatibility whereas maintaining the majority magnetic figures of benefit. either macroscopic and microscopic homes of some of these NPs, hitherto unexplained, were printed for the 1st time.

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Extra info for Magnetic Nanoparticles: A Study by Synchrotron Radiation and RF Transverse Susceptibility

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2). From this morphological study we conclude that we have obtained a system of selforganized and uniformly dispersed amorphous Co–W alloy NPs. This occurs since W has alloyed with the preformed Co NPs, instead of growing as a homogeneous crystalline film covering the particles. The size of the amorphous particles depends on the amount of Co and W deposited on each layer. Particles formed within the layers have an oblate shape. When the amount of W increases and the Co–W alloy saturates, W grows as a crystal and fills the interparticle spaces.

With the absorption of a photon of energy E, the electron undergoes a transition to an unbound state in the continuum and, by conservation of energy, acquires a kinetic energy (E − E 0 ) [8] Absorption jump Absorption, μ Fig. 6 XAFS spectrum recorded at the Pt L 3 edge for a Pt foil at 300 K. We have divided the spectrum into its two main regions: XANES—X-ray Absorption Near Edge Structure, and EXAFS—Extended X-ray Absorption Fine Structure. 1 X-ray Absorption Fine Structure X-ray absorption fine structure (XAFS) is a specific structure observed in XAS [8, 9].

44 3 Structural and Magnetic Properties of Amorphous Co–W Alloyed Nanoparticles Fig. 8 FT EXAFS signal at the Co K edge for the bulk Co3 W alloy and comparison with that of a Co–W alloy NPs sample. Dashed lines best fit of the first Co coordination shell for each sample. 5nm 0 1 2 3 4 5 R (Å) Fig. 9 Best fits to the first coordination shell on the Co K edge R-space EXAFS signal for all five Co–W nanoparticles samples studied. a a samples series. b b samples series. 5 (see Figs. 9). For comparison, the EXAFS signal of the bulk Co3 W alloy has been fitted in the same R range.

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