Cobalt nanostructures

Nickel films were thermally oxidized in a preheated furnace at 450 °C for lOh under an oxygen atmosphere, while cobalt nanostructures were annealed at 600 C for 6h [18]. 

Philippe, L. Kacem, N. Michler, J. Electrochemical deposition of metals inside high aspect ratio nanoelectrode array Analytical current expression and multidimensional kinetic model for cobalt nanostructure synthesis. J. Phys. Chem. C2007, 111, 5229-5235. 

Figure 1.3 SEM image of a ID cobalt nanostructure. Reproduced from Zhang, Tianmin Lan, Yafei Zhang et al.. Template-free Liying Synthesis of One-dimensional Cobalt Nanostructures by Hydrazine Reduction Route, Nanoscale Res Lett2011,6 58.

Zhang, L., Wang, T.L.J., Wei, L. et al. (2011) Template-free synthesis of onedimensional cobalt nanostructures by hydrazine reduction route. Nanoscale Research Letters, 6, 58. 

Sithambaram, S., Garces, H.F. and Suib, S.L. (2009) Controlled synthesis of self-assembled metal oxide hollow spheres via tuning redox potentials versatile nanostructured cobalt and cobalt manganese oxides. Advanced Materials, 20, 1205-1209. 

Ding, Y., Xu, L., Chen, C., Shen, X. and Suib, S.L. (2008) Syntheses of nanostructures of cobalt hydrotalcite like compounds and Co304 via a microwave-assisted reflux method. Journal of Physical Chemistry C, 112, 8177-8183. 

P.N. Bartlett, P.N. Birkin, M.A. Ghanem, P. de Groot, and M. Sawickib, The electrochemical deposition of nanostructured cobalt films from lyotropic liquid crystalline media. J. Electrochem. Soc. 148, Cl 19-023 (2001). 

J. D. Carter, G. Cheng, and T. Guo, Growth of self-aligned crystalline cobalt siUcide nanostructures from Co nanoparticles, J. Phys. Chem. B 108, 6901-6904 (2004). 

Accurate control of microstructure on nanometric scale makes it possible to control magnetic and mechanical properties to a hitherto unattainable degree. In particular, magnetic nanostructures have recently become the subject of an increasing number of experimental and theoretical studies. The materials are made of alternating layers, around 10 A thick, of magnetic (e.g., cobalt) and nonmagnetic metals (e.g., copper). 

Over the past 30 years, our laboratory has examined the synthesis of nanostructured materials for advanced catalysts. The first process for the synthesis of fine grains of cobalt molybdates for hydrodesulfurization catalysis... 

At the work it is established that the morphological and crystallographic characteristics of the formed nanostructures and also the initial temperature of their formation depend on the conditions of Me-CF obtaining and cationic-anionic structure of the salt additions introduced into the initial F1C fibers. So, at the pyrolysis of F1C with the additions of ferric and cobalt chlorides the carbon structuring does not occur amorphous carbon are formed in all studied intervals of THT. 

Jiao F, Frei H. Nanostructured cobalt oxide clusters in mesoporous silica as efficient oxygen-evolving catalysts. Angew Chem Int Ed. 2009 48(10) 1841—4. 

Nickel containing scales exhibit higher conductivity because of the presence of trivalent nickel ions, which introduce vacancies in the lattice of the scale. Therefore, nickel-based coating can lead to superior conductivity and good protection provided that it is alloyed properly with corrosion resistant elements. Cobalt has a lower solubility in molten carbonate and electroless Co has been successfully used for a variety of corrosion-resistant applications. Electroless plating of Ni-Co gives rise to deposition of uniform layers of nanostructured material, which would result in better protection of the substrate. 

Also not new are the phenomena seen in nanostructures—all sol-gel (e.g.. Chapter 13 all aerogels are nanocrystalline ) and life chemistry is nanostruc-tural, and chemists long have been able to prepare molecular clusters and nanocrystalline powers by vaporization or, better, by decomposition of precursors (typically hydroxides, carbonates, nitrates, acetates, citrates, and so on). Even the recent production of biphasic or polyphasic nanostructures from polymers had been preceded by the decomposition of mixed crystals [e.g., CaMg(Co3)2, dolomite, to CaO and MgO]. Carbon and SiC fibers (Nicalon ) are nanostructural. In this book, nanocrystalline cobalt from 1966 is mentioned (Chapter 18). Naturally, the nanostructural works of chemists could not be directly examined before the advent of electron microscopes, but more indirect... 

The 2007 cost of 67/kW is based on a new design by the 3M Company, which utilizes 3M s nanostructured thin film (NSTF) catalyst support for the cathode (Ahluwalia et ah, 2007 Lasher et ah, 2007). The cathode uses the bulk of the platinum. NSTF (apparently a carbon fabric ), in conjunction with vacuum deposition of an iron-cobalt-carbon-nitrogen cathode catalyst followed by a heat treatment, has apparently been successful in cutting the platinum requirement by more than half while increasing performance (3M Company, 2007). The research team at 3M is also optimistic about production costs. 

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