Magnetic core-shell nanopartides

Gomes, J.D., Sousa, M.H., Tourinho, F.A. and Aquino, R. da Silva, G.J., Depeyrot, J., Dubois, E., Perzynski, R. (2008) Synthesis of core-shell ferrite nanopartides for ferrofluids chemical and magnetic analysis. Journal of Physical Chemistry C, 112 (16), 6220-6227. 

Vogt, C., Toprak, M.S., Muhammed, M., Laurent, S., Bridot, J.L. and Muller, R.N. (2010) High quality and tuneable silica shell-magnetic core nanopartides. Journal of Nanoparticle Research, 12 (4), 1137-1147. 

The preparation of core-shell -type magnetic nanopartides was reported [92,93] as a two-step synthesis in which nanopartides of one metal served as the seeds for growth of the shell from another metal. Thus, the reduction of platinum salts in the presence of Co nanopartides would allow the preparation of air-stable CocorePtsheii nanopartides [92]. The thermal decomposition of cobalt carbonyl in the presence of silver salt led to the formation of AgcoreCOgheii nanopartides [93]. The syntheses of these multicomponent magnetic nanostructures are discussed in Section 3.3.2.4. 

Figure 49 General synthetic scheme of magnetic and semiconducting hybrid nanowires templated from core-shell molecular bmshes (a) a molecular brush with a PAA core and a PriBA shell (b) the PAA core neutralized into poly(sodium acrylate) (c) a polychelate consisting of a polymer brush and Fe, Fe, or Cd ions and (d) a hybrid nanowire of a polymer bmsh with a wire-like assembly of magnetic/semiconducting nanopartides in its core. Reprinted from Zhang, M. Muller, A. H. E. J. Pofym. Sci. Part A Polym. Chem. 2005, 43 (16), 3461-3481, with permission from Wiley-VCH. ...

In this chapter we focused on the characterization of core-shell magnetic nanopartides as determined by X-ray photoelectron spectroscopy (XPS). XPS, also known as Eledron Spectroscopy for Chemical Analysis (ESCA), is an elemental analysis technique and used to determine quantitatively the atomic composition and surface chemistry. XPS spedra are obtained by irradiating a material with a beam of X-rays while simultaneously measuring the kinetic energy and number of electrons that escape from the top 1 to 10 nm of the material being analysed (Watts et al., 2003 http //en. Wikipedia org/wiki/X-ray photoelectron spectroscopy). 

Chen, W.J., Tsai, P.J. and Chen, Y.J. (2008) Functional Fe304/Ti02 core/shell magnetic nanopartides as photokilling... 

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