2016 – 2018: Síntese e Caracterização de Propriedades Físicas de Microtubos

Abstract: The main target of this project is to give continuity to the research activities already started here in UFABC. It is important to emphasize that the development of the previous project has been very fruitful with a strong impact not only to understand of microtube and hierarchical structure formation, but also with potential technological applications. Therefore, we intend to extend this research line evolving hollow microstructure decorated with nanostructures. Along this line, the objective of this proposal is to synthesize hierarchical structure and study the physical properties of two families of transition metal oxides: zinc oxide ZnO and TiO2. Within this context, a better understanding on the formation kinetic of microtubes, nanostructure, and hierarchical structures through thermal oxidation method along with the simultaneous passage of electric current should reveal important results. Furthermore, morphological, structural, electric, and magnetic properties of the samples will be studied.

2013 – 2015: Synthesis and Characterization of Physical Properties of Nanosized Materials

Abstract: A considerable effort has been put forward in order to grow magnetoelectric nanostructured materials. Besides fundamental science, they are very attractive in the electronic industry as well as magnetic storage media, solar energy conversion due to their nanometer scale. Semiconducting properties along with ferromagnetic order functionality have been the focus in the area of spintronics. It is believed that all metal oxides in nanostructured forms would exhibit ferromagnetic order at room temperature which disappears in bulk samples. The general understanding is that the origin of ferromagnetism in these materials is the magnetic exchange interactions between localized electron spin moments resulting from uncompensated charges, intrinsic defects, cation or anion vacancies at the surfaces of the nanostructures. However, systematic studies on the origin of ferromagnetism are lacking. Within is context, we intend to study the physical properties of transition metal oxides and conventional multiferroic system in nanosized scale focusing on the origin of ferromagnetism and ferroelectricity.

Situação: Em andamento; Natureza: Pesquisa.

Alunos envolvidos: Graduação: (2) / Mestrado acadêmico: (2) / Doutorado: (2).

Integrantes: Jose Antonio Souza – Coordenador.

Financiador: Fundação de Amparo à Pesquisa do Estado de São Paulo – Auxílio processo 2013/16172-5.

 

2010 – 2012: Síntese de materiais e caracterização das suas propriedades termodinâmicas e transporte elétrico

Descrição: O projeto de pesquisa científico proposto para os próximos anos contempla um estudo sistemático das propriedades térmicas, magnéticas e de transporte elétrico em diversos sistemas de interesse. (1) Estudo de sistemas com propriedades físicas fortemente correlacionadas com ênfase em transições de fase e fenômenos críticos. Neste sistema, duas famílias de óxidos são de interesse: manganitas – com propriedades magnéticas (spin), eletrônicas (carga) e estruturais (rede cristalina) fortemente correlacionadas; multiferrôicos que apresentam coexistência de ordem magnética e elétrica, com possível acoplamento entre elas; (2) Materiais magnéticos moleculares. (3) Nanoparticulas magnéticas e metálicas embebidas em matrizes poliméricas..

Situação: Concluído; Natureza: Pesquisa.

Alunos envolvidos: Graduação: (1) / Mestrado acadêmico: (2) / Doutorado: (1) .

Integrantes: Jose Antonio Souza – Coordenador.

Financiador: Fundação de Amparo à Pesquisa do Estado de São Paulo – Auxílio processo 2009/18618-5.