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Análise computacional de defeitos intersticiais em nanocristais de Si

Neste trabalho são estudadas diferentes propriedades de defeitos intersticiais em silício cristalino e nanocristais de silílico. Os modelos são baseados na teoria do funcional da densidade. Numa fase inicial são feitos testes de convergência para escolher parâmetros de modelação, em particular as funções de base. Para clarificar a identidade de alguns centros de origem intersticial, são estudados vários modelos...

Photoluminescent Layered Lanthanide Silicate Nanoparticles

The first examples of nanoparticles of pure layered Ln2(SiO4H)(OH)2(H2O)Cl (where Ln ) Eu, Gd, and Tb) and mixed microcrystalline layered lanthanide silicates containing different Eu/Gd and Tb/Gd ratios have been reported. The crystal structure of these silicates has been solved from synchrotron powder X-ray diffraction data. These materials display interesting and tuneable photoluminescence (PL) properties, su...

Reactivity of paraquat with sodium salicylate: formation of stable complexes

Evolution of Photoluminescence across Dimensionality in Lanthanide Silicates

The dehydratation process of layered lanthanide silicates K3[LnSi3O8(OH)2], Ln = Y, Eu, Tb, and Er, and the structural characterization of the obtained small-pore framework K3LnSi3O9, Ln = Y, Eu, Tb, and Er solids, named AV-23, have been reported. The structure of AV-23 has been solved by single-crystal X-ray diffraction (XRD) methods and further characterized by chemical analysis, thermogravimetry, scanning el...

Oral squamous cell carcinoma: Review of prognostic and predictive factors

Oral squamous cell carcinoma has a remarkable incidence worldwide and a fairly onerous prognosis, encouraging further research on factors that might modify disease outcome. In this review article, the authors approach the factors that may exert influence on the prognosis and eventually guide the selection of patients for more aggressive therapies. Published scientific data was collected, selected, and grouped i...

Análise do processo de integração dos alunos com necessidades educativas especi...

Dissertação de Mestrado em Ciência do Desporto, área de especialização em Actividade Física Adaptada, apresentada à Faculdade de Ciências do Desporto e de Educação Física da Universidade do Porto