6 documents found, page 1 of 1
Throwing light on an uncommon preservation of blattodea from the Crato formatio...
Bezerra, Francisco Irineudo; Silva, João Hermínio da; Paula, Amauri Jardim de; Oliveira, Naiara Cipriano; Paschoal, Alexandre RochaFossilization results from several physical-chemical-geological processes. Original labile and non-bioclastic structures rarely survive throughout this process. In particular, the Crato Formation (Araripe Basin) is one of the most significant Cretaceous KonservatLagerstätten due to its well-preserved invertebrates, mainly three-dimensional insects. In general, Crato insects exhibit brown-orange color, constitut...
Nanotubos de titanatos contendo metais de transição aplicados na condensação de...
Bessa, Bruno dos Santos; Oliveira, Alcineia Conceição; Mendes Filho, Josué; Viana Neto, Bartolomeu CruzA síntese e caracterização de nanotubos de titanatos intercalados com metais de transição (Al3+, Ni2+, Cr2+ e Co2+) foram investigadas. Os sólidos foram caracterizados quanto as suas propriedades físico-químicas por Microscopia eletrônica de varredura acoplada a EDS (MEV-EDS), difração de raios-X (DRX), espectroscopia Raman, isotermas de adsorção-dessorção de nitrogênio. A atividade catalítica dos sólidos na re...
Estudo da remoção do corante remazol reactive blue 19 por eletrocoagulação util...
Silva, L. T. V.; Martins, Igor Alves; Sena, Luiza Maria Gomes de; Abdala Neto, Eliezer Fares; Viana Neto, Bartolomeu Cruz; Oliveira, Juliene ToméO trabalho tem como objetivo investigar a tecnologia de eletrocoagulação (EC) na remoção do corante têxtil Reactive Blue 19 utilizando eletrodos de alumínio e alumínio modificados por nitretação à plasma com a configuração de gaiola catódica de titânio. A partir desses experimentos foi possível observar que os melhores percentuais de remoção de cor e COT (87,72% e 86,27%, respectivamente), foram obtidos quando ...
Photoluminescence enhancement of titanate nanotubes by insertion of rare earth ...
Marques, Thalles Moura Fé; Lima, Cleânio da Luz; Sacilloti, Marco Antonio; Fujisawa, Kazunori; Perea Lopez, Nestor; Terrones, MauricioThe optical properties of titanate nanotubes (TiNts) intercalated with rare earths (RE) ions were intensively investigated in this study. To prepare the nanomaterials, sodium titanate nanotubes (Na-TiNts) were submitted to ion exchange reactions with different rare earth elements (RE: Pr3+, Er3+, Nd3+, and Yb3+). To the best of our knowledge, it is the first time that these RE-TiNts were synthesized. All sample...
Propriedades estruturais e vibracionais de nanocristais de TiO2 dispersos em ma...
Viana Neto, Bartolomeu CruzNanostructured materials are the subject of intense investigation due to their remarkable properties as compared their bulk counterparts. The size-induced phenomena are interesting their own and open unique opportunities not only for using these properties in novel applications but also for improving the current technology. In this scenario integrated chemical systems (ICS) are set apart owing their complexity ...
Propriedades estruturais e vibracionais de nanotubos e nanofitas de titanato
Viana Neto, Bartolomeu CruzThis work reports a study on the structural, morphological and vibrational properties of titanate nanotubes and nanoribbons obtained from hydrothermal treatment of TiO$_2$ in aqueous NaOH solutions. The physical properties of these as-synthesized and heat-treated nanostructures are discussed in comparison with their bulk (Na$_2$Ti$_3$O$_7$ and Na$_2$Ti$_6$O$_{13}$) counterparts. The results obtained from transm...