https://ri.ufs.br/jspui/handle/riufs/173 2026-05-04T05:51:06Z https://ri.ufs.br/jspui/handle/riufs/24739 Título: Effects of adding some natural substances to biodiesel to control its effect on carbon steel corrosion Autor(es): Santana, Paulo Moura Bispo de; Meira, Marilena; Tentardini, Eduardo Kirinus 2015-01-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/24454 Título: Highlights on the effects of graphene-family materials dispersion on hydration and mechanical properties of cement-based materials Autor(es): Prudente, Isis Nayra Rolemberg; Santos, Hericles Campos dos; Fonseca, Jander Lopes; Oliveira, Jéssica Fernanda Ribeiro; Shibutani, André Balbino; Gimenez, Iara de Fátima; Santos, Euler Araujo dos; Barreto, Ledjane Silva Abstract: Graphene-family materials (GFMs) have gained notoriety in academic research due to their ability to improve the mechanical properties of cementitious matrices and provide new functionalities to conventional systems, such as self-healing properties. However, the use of GFMs faces challenges due to the difficulty of these materials dispersing properly in cementitious matrices, often resulting in the agglomeration of nanomaterials. This tendency to agglomerate directly impacts critical properties of cementitious matrices such as workability and mechanical strength. Therefore, several research studies are being conducted to address dispersion issues and understand the interactions between GFMs and their matrices. However, the literature still lacks consensus on important topics, such as the parameter definitions that influence the cement hydration reaction rate, the factors affecting workability, the cement/GFMs interaction models, the type and optimal amount of GFMs to be used for each system, the characteristics of those GFMs (type and amount of functional groups, presence or absence of defects), and how differences in matrices and dispersants affect mechanical strength parameters. Finally, this work synthesizes the current knowledge on the effects of GFMs and their dispersion on cementitious properties, while also providing an assessment of the limitations of meta-analytical approaches in this field. 2025-11-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/24398 Título: Mechanical properties of epoxy resin based on granite stone powder from the Sergipe fold-and-thrust belt composites Autor(es): Gonçalves, Jorge Antônio Vieira; Campos, Diego Adalberto Teles; Oliveira, Gislane de Jesus; Rosa, Maria de Lourdes da Silva; Macêdo, Marcelo Andrade 2014-01-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/24383 Título: Avaliação da potencialidade de argilas da formação geológica Calumbi e Riachuelo em Sergipe para aplicação em revestimento cerâmico Autor(es): Goes, José Resende; Azevedo, Thiago Figueiredo; Dutra, T. X. C.; Santos, V. B.; Severo Júnior, J. B.; Barreto, Ledjane Silva Abstract: Clays are the most important materials from the technological point of view, for the production of ceramic materials. Its chemical and mineralogical composition strongly influences the physical and chemical properties to be obtained in the finished product of ceramic. The aim of this paper was to evaluate the potential of clays of the Calumbi and Riachuelo geological formation in Sergipe, Brazil, for the application in ceramic tiles. Samples were collected from 03 clay deposits (“A”, “B” and “C”) and characterized by granulometryassays, plasticity, X-ray diffraction, and differential thermogravimetric analysis, infrared and X-ray fluorescence. The main identified phases were: quartz, kaolinite, illite, calcite and feldspar, and deposits “B” and “C” showed high levels of calcite. It was found that for ceramic processing conditions adopted in this paper, the properly mixed clay deposits of “A” and “B” are suitable for use in the processing industry ceramic tiles, particularly for obtaining of the classification of the absorption group “BIII”. 2014-01-01T00:00:00Z