Ft Ir
Mostrando 13-24 de 422 artigos, teses e dissertações.
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13. Extraction and evaluation of tannin from green coconut mesocarp
RESUMO O desenvolvimento de alternativas para o aproveitamento da casca de coco possibilita a redução da disposição inadequada de resíduos sólidos e proporciona uma nova opção de rendimento junto aos locais de produção. O presente trabalho tem como objetivo avaliar o potencial de extração de taninos do mesocarpo de coco verde e sua capacidade ade
Matéria (Rio J.). Publicado em: 16/09/2019
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14. Biomimetic Coating of Mechanochemically Synthesized Zirconium Titanate
A biomimetic method was used to promote bioactivity of ZrTiO4. Zirconium titanate was obtained by using a combination of techniques such as mechanical milling and heat treatment of zirconia and titania powders. The effect of milling time on the evolution of the ZrTiO4 phase formation was studied. Powders were uniaxially pressed followed by heat treatment for
Mat. Res.. Publicado em: 10/07/2019
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15. Obtenção de hydrochar a partir de carbonização hidrotérmica de cascas do fruto de Magonia pubescens A. St. Hil. Sapindaceae: Caracterização e avaliação em processo de adsorção
RESUMO A Carbonização hidrotermal (HTC) de cascas do fruto de Magonia pubescens A. St. Hil. Sapindaceae (Tingui do cerrado) é apresentada como uma proposta inédita na produção de hydrochars a partir de precursores de espécies do Cerrado Brasileiro, onde se verificou a influência da temperatura nas propriedades dos materiais obtidos. Os hyrochar obtid
Matéria (Rio J.). Publicado em: 10/06/2019
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16. Solvent Degradation and Polymerization Shrinkage Reduction of Resin Composites Using Isobornyl Methacrylate
Resumo O objetivo nesse estudo foi utilizar o isobornil metacrilato (IBOMA) como monômero combinante ou substituinte na matriz resinosa de resinas compostas odontológicas. Para tanto, a matriz resinosa foi formulada com 60 % em peso de BisGMA e 40 % em peso de monômero diluente. O TEGDMA foi utilizado como único monômero diluente para o grupo controle c
Braz. Dent. J.. Publicado em: 03/06/2019
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17. TARGETED AND NON-TARGETED ANALYSIS BASED ON ULTRA HIGH PERFORMANCE LIQUID CHROMATOGRAPHY AND FOURIER TRANSFORM INFRARED SPECTROSCOPY FOR PARIS SPECIES OF DIFFERENT GEOGRAPHICAL ORIGINS
Various species of Paris have been used in treatments for their antitumor, antimicrobial, hemostatic, anthelmintic and immune-stimulating properties, among others. The bioactive markers of these plants including paris saponins I (PSI), paris saponins II (PSII), paris saponins VI (PSVI) and paris saponins VII (PSVII) are responsible for inhibiting nasopharyng
Quím. Nova. Publicado em: 27/05/2019
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18. Preparation and characterization of cefuroxime axetil solid dispersions using poloxamer 188
The main objective of the present work was to enhance the solubility and dissolution rate of poorly water-soluble drug cefuroxime axetil (CA) by formulating it into solid dispersions (SDs) with water soluble carrier poloxamer 188. Different methods were employed to prepare the dispersion, such as: Solvent method (SM), Kneading method (KM), Melt evaporation m
Braz. J. Pharm. Sci.. Publicado em: 08/04/2019
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19. Evaluation of Techniques for Determination of Hydroxyl Value in Materials for Different Industrial Applications
ABSTRACT When some materials need to be characterized, the hydroxyl number (IOH) determination is especially useful, mainly for those applied in the aerospace field. Usually, this characterization is performed by wet chemistry, using methodologies involving several steps, such as derivatization. This is a time-consuming and costly step. On the other hand, wh
J. Aerosp. Technol. Manag.. Publicado em: 04/04/2019
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20. Gamma irradiation effects on polycaprolactone/zinc oxide nanocomposite films
Abstract Polycaprolactone (PCL) to which has been added zinc oxide nanoparticles (ZnO NPs) produces nanocomposites (PCL/ZnO NCs). These nanocomposites can be used in biomedical applications and in the food packaging sector. However, for these materials to be used in these applications, they need to be sterilized. For this, gamma irradiation is the most comm
Polímeros. Publicado em: 21/03/2019
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21. SYNTHESIS, ELECTRONIC AND SPECTRAL PROPERTIES OF NEW 1,3,4-THIADIAZOLE COMPOUNDS AND THE SPECTRAL ANALYSIS OF THEIR CONFORMERS USING DENSITY FUNCTIONAL THEORY
In this study, new 1,3,4-thiadiazole compounds were synthesised and characterised by FT-IR, 1H-NMR, UV-vis spectroscopy and elemental analysis, Furthermore, the relationship between the electronic and spectral data of the 16 conformers of each compound was investigated by theoretical calculations; the theoretical data were compared with the experimental resu
Quím. Nova. Publicado em: 2019-02
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22. Quantification of Aerospace Polymer Blends by Thermogravimetric Analysis and Infrared Spectrometry
ABSTRACT Ethylene-propylene-diene elastomer (EPDM) is employed as thermal insulation for rocket motors, as well as EPDM blends with ethylene vinyl acetate (EVA) have been used in the aerospace industry. The quantification of these blends is more common using Fourier Transform Infrared Spectrometry (FT-IR) by transmission mode, but without discussing sample p
J. Aerosp. Technol. Manag.. Publicado em: 07/01/2019
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23. Quantification by FT-IR (UATR/NIRA) of NBR/SBR blends
Abstract Rubber blends are important materials in automotive industry, as well as in other sectors. However, there are implications when suitable use of a polymer in an artifact is not made. In the automotive area, for example, the use of an elastomer without the fuel resistance requirement would result in component degradation, potential fuel leakage, and
Polímeros. Publicado em: 29/11/2018
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24. Synthesis, characterization and antibacterial activity of novel poly(silyl ether)s based on palm and soy oils
Abstract In this research, palm oil and soy oil were used as a natural polyol to prepare novel poly(silyl ether)s. Palm oil and soy oil were first converted to monoglyceride by one step via alcoholysis process in the presence of 0.1% CaO as a catalyst. The monoglycerides were characterized by Fourier transform infrared spectrometer (FT-IR), nuclear magnetic
Polímeros. Publicado em: 29/11/2018