International Research Journal of Materials Sciences and Applications


Evaluation of commercial and fresh-picked Origanum vulgare after dehydration

Research Article of International Research Journal of Materials Sciences and Applications Evaluation of commercial and fresh-picked Origanum vulgare after dehydration Vanessa Cristina dos Santos Peixoto de Oliveira1, Maria Inês Bruno Tavares1, Eduardo Miguez Bastos da Silva1, Paulo Sérgio Rangel Cruz da Silva1, Tiago Venâncio2 1Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Professora Eloisa Mano, Av Horácio Macedo 2030, Bloco J, Centro de Tecnologia, Ilha do Fundão, Rio de Janeiro, RJ, Brazil, CEP 21941-598 2Departamento de Química, Universidade Federal de São Carlos, São Carlos, SP, Brazil Origanum vulgare Lamiaceae is one of the most used condiments in many countries, and is used in the perfume industry and also in folk medicine. To evaluate the composition of this plant due to its heterogeneity, the main objective was analyze origanum in commercial form and fresh picked after treated at different temperatures, using mainly solid-state NMR techniques, as well as FTIR, XRD and TGA were applied, showing possible existence of larger molecules and structures with low molar mass due to difference of mobility presented by molecules. We observed the carbon-13 signals’ intensity and the signals detection or not varied according to kind of oregano studied as well as the thermal treatment temperature. The techniques are efficient in determining the compounds present in such heterogeneous material, although they are difficult to apply. The HR-MAS confirmed the existence of major compounds such as water, fixed oils, terpenes and polysaccharides. Keywords: Origanum vulgare L; polysaccharides; NMR; heterogeneity ...

Vinyl Ester/Glass Microballoon Syntactic Foams with Low Density

Research Article of International Research Journal of Materials Sciences and Applications Vinyl Ester/Glass Microballoon Syntactic Foams with Low Density Salleh1, 2, M.M. Islam*1, J.A. Epaarachchi1, Haibin Su3 1Centre for Future Materials, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland 4350, Australia 2Universiti Kuala Lumpur, Malaysian Institute of Marine Engineering Technology, 32200, Lumut, Perak, Malaysia 3Division of Materials Science, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798. In this study, the synthesis and characterization of vinyl ester/glass microballoon syntactic foams with different weight percentages are investigated. Both the tensile and compressive properties of the syntactic foams are characterized. Generally, the results show that the compressive strength and moduli of several syntactic foam compositions are comparable to those of pure vinyl ester as a matrix resin. Due to the lower density of syntactic foams, the specific compressive properties of SCFT-01 (2wt.%) are higher than all other specimens and closer to neat resin. Similar trends are also observed in the tensile properties. The results show that syntactic foams with vinyl ester matrix possess strength behaviour that varies with different content of glass microballoons. This difference is related to the possibility of particle fracture in the stress range where modulus is calculated from the compressive stress–strain curves. In addition, tensile modulus is found to be 70–80% higher than the compressive modulus for all syntactic foam compositions, but both of them are still lower than neat resin. The results also show that the content of glass microballoons in the syntactic foams should be controlled to obtain a good combination of compressive strength and tensile strength. The reasons are discussed in detail. Keywords: Syntactic foam, composite, glass microballoon, resin, wall thickness ...

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International Research Journal of Materials Sciences and Applications

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