Ione Amorim Bezerra Neta

O setor de cerâmica no Brasil vivencia uma grande expansão, tendo uma participação no PIB nacional de quase 1,0%, em virtude principalmente dos materiais cerâmicos serem os mais utilizados na construção civil. Diante disto, as elevadas perdas de produtos manufaturados gera grande quantidade de resíduos, causando transtornos as imediações vizinhas. Baseado nisso, este trabalho teve como finalidade avaliar a viabilidade de incorporar o resíduo gerado por uma indústria de cerâmica vermelha em uma massa cerâmica argilosa para produção de tijolos e incentivar o reaproveitamento de tal resíduo. Foi realizada caracterização química das amostras e três misturas cerâmicas foram formuladas, utilizando uma argila plástica e o resíduo, onde posteriormente confeccionou-se corpos-de-prova. Os corpos de prova foram sinterizados e passaram para análise físico-mecânica. A adição do resíduo na massa em substituição a argila sem plasticidade, se mostrou favorável em relação as propridedaes físicas, sendo que a propriedade mecânica deverá ser reavaliada.

Pure ZnO particles, doped and co‐doped with Cu²⁺ and Mg²⁺ ions, were obtained by the simple sonochemical method. The wurtzite hexagonal structure was confirmed by X‐ray diffraction (XRD) patterns. The images obtained by field emission scanning electron microscopy (FE‐SEM) showed irregular and more agglomerated particles with the increase of Cu²⁺ and Mg²⁺ ions concentration in the ZnO lattice, with the average diameter of particles in the range of 57.23–170.77 nm. The photocatalytic activity was investigated by decolorizing the methylene blue (MB) dye under ultraviolet C (UVC) light irradiation which indicates that 1% Mg‐doped ZnO particles have better the photocatalytic activity than the other samples, and presented the highest kinetic constant value. The co‐doped samples showed a reduced global surface area which did not favor the good photocatalytic performance. The sacrificial agents showed that OH• radicals are the main species involved in the photocatalytic activity of this system and defects generated in the ZnO lattice promoted photoluminescent emission in the red and green regions.

Titanium dioxide (TiO2) based nanostructured materials have shown great potential for use in implants thanks to their excellent physicochemical properties, such as high specific surface area, ability to elicit positive cell response, and stability in body fluids. However, there are few studies in the literature that focus on the use of nanostructured TiO2 to support cell growth and bone regeneration. The purpose of this survey is to review the state of the art of TiO2 for use in bone implants, as well as provide insight into its characteristics and synthesis methods. Studies of the biological properties of nanostructured TiO2 are described, establishing its potential for the biomedical field.