Resumo

ZAMBRANO, Gustavo. Effect of nanoestructure on the thermal and magnetic properties of 2D and 0D type nanomaterials. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2020, vol.44, n.170, pp.153-168.  Epub 15-Jun-2021. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.916.

In this review paper, we present a study related to the nanostructure effect on the properties and applications of nanomaterials. Given in fact the broad field of research of the nanomaterials science, we analyze in particular the 2D YSZ (Yttria-Stabilized Zirconia-ZrO2/Y2O3) thermal barrier nanostructured protective thin film coatings deposited by PVD (Physical Vapor Deposition) sputtering technique at an oblique angle, and the 0D magnetic nanoparticles of Co-Zn ferrites (Co1-xZnxFe2O4) obtained by chemical co-precipitation method. In the case of YSZ thermal barrier 2D nanostructured protective coatings, it was concluded that the value of thermal conductivity (k) is strongly influenced by the "zigzag" microstructure of PVD coatings. A decrease of (k) in an order of magnitude, when the columns change from normal growth orientation (α = 0) with respect to the substrate surface, to a microstructure in a "zigzag" pattern with n = 50 repetitions, is presented. This shows the growth potential of YSZ thin films by manipulating the nanostructure at an oblique angle deposition as an effective method to improve the thermal insulating property of this material. On the other hand, we can established that the magnetic properties of the Co1 xZnxFe2O4 nanoparticles such as the coercive field and the saturation magnetization are strongly correlated to particle size and crystal structure properties, and the Co1-xZnxFe2O4 ferrite presented a tendency to superparamagnetic behavior at room temperature. This result implies that the magnetic nanoparticles can be considered soft magnetic material. The above makes Co1-xZnxFe2O4 nanoparticles attractive for applications in the field of photonics and electronics, as well as for biomedical applications.

Palavras-chave : Nanostructured materials; Yttria stabilized zirconia; Zinc cobalt ferrites; Sputtering; Chemical co-precipitation.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )