Center for the Development of Nanoscience and Nanotechnology

Santiago, Chile

Center for the Development of Nanoscience and Nanotechnology

Santiago, Chile
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Alburquenque D.,University of Santiago de Chile | Perez-Erices L.,University of Santiago de Chile | Pereira A.,Center for the Development of Nanoscience and Nanotechnology | Escrig J.,University of Santiago de Chile
Journal of Magnetism and Magnetic Materials | Year: 2017

Ni81Fe19Oy thin films with different thicknesses were obtained by atomic layer deposition. After a thermal reduction process, Ni81Fe19Oy films were converted to their strong Ni81Fe19 ferromagnetic phase, usually known as Permalloy. The different thicknesses were obtained by considering 500, 1000, 1500 and 2000 supercycles, which are defined as a cycle of NiCp2/O3 followed by another cycle of FeCp2/O3. The samples were characterized before and after the thermal reduction process with respect to their crystallinity, morphology and magnetism. In particular, the thermally reduced samples exhibit holes whose sizes increase significantly as the thickness of the samples also increases, affecting their magnetic behaviour. As Permalloy is widely used in many applications, its synthesis through atomic layer deposition is expected to introduce comparative advantages over other synthesis processes, opening up new possibilities for nanoelectronic devices. © 2017 Elsevier B.V.


Alburquenque D.,University of Santiago de Chile | Del Canto M.,Center for the Development of Nanoscience and Nanotechnology | Arenas C.,University of Santiago de Chile | Tejo F.,University of Santiago de Chile | And 2 more authors.
Thin Solid Films | Year: 2017

Nickel oxide thin films with different thicknesses were synthesized by atomic layer deposition. After a thermal reduction process, under a controlled atmosphere of hydrogen, it was possible to convert nickel oxide to metallic nickel. The different thicknesses were obtained for 250 to 2000 cycles of NiCp2/O3. The Ni thin films were characterized by X-ray diffraction, scanning electron microscopy, and by Magneto-Optical Kerr effect measurements. Micromagnetic simulations have been performed to investigate the mechanism of magnetization reversion of these films. Interestingly, the thermal reduction of films synthesized by ALD allows the generation of both randomly oriented, sized and spaced Ni islands and antidot arrays from thin films. © 2017 Elsevier B.V.


Pazos M.C.,Pedagogical and Technological University of Colombia | Castro M.A.,CSIC - Institute of Materials Science | Cota A.,Laboratorio Of Rayos X | Osuna F.J.,CSIC - Institute of Materials Science | And 2 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2017

The major components of the wastewater from the petroleum refineries are benzene, toluene and phenol and one of the techniques applied to the treatment of effluents is sorption using organo-functionalized clay. The materials exploited in the present study are a family of surface-functionalized synthetic micas and their sorption capacities for non-ionic organic pollutants are analyzed. The organo-functionalization of their surface provides them the capacity to sorb effectively non-ionic pollutants in the interface. Their adsorption performance is a function of the alkylamonium properties such as the chain length, the mass fraction and the organization of the organic cation in the interlayer space of the micas. © 2017 The Korean Society of Industrial and Engineering Chemistry.

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