Sodium Hydroxide
Mostrando 25-36 de 214 artigos, teses e dissertações.
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25. Comparative study of Mycobacterium bovis primary isolation methods
Abstract For the definitive diagnosis of bovine tuberculosis, isolation of the etiologic agent is required. However, there is no consensus on the best methodology for isolation of Mycobacterium bovis in Brazil. This study evaluated the most used decontaminants and culture media in the country, in order to identify the best combination for the Brazilian sampl
Braz. J. Microbiol.. Publicado em: 2017-03
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26. Ag Nanoparticles-Based Zinc Hydroxide-Layered Hybrids as Novel and Efficient Catalysts for Reduction of 4-Nitrophenol to 4-Aminophenol
Silver nanoparticles and zinc hydroxide-layered hybrid materials (AgNPs/ZHL) have been successfully developed as efficient catalysts for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with sodium borohydride. A facile and rapid visible-light assisted green route was used for the deposition of silver nanoparticles (AgNPs) on the external surfac
J. Braz. Chem. Soc.. Publicado em: 2017-01
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27. UTILIZAÇÃO DE HEMICELULOSES CATIÔNICAS, OBTIDAS A PARTIR DO APROVEITAMENTO DA PALHA DE MILHO, ASSOCIADAS COM TANINO PARA O TRATAMENTO DE EFLUENTES DE LAVANDERIA INDUSTRIAL
The synthesis of cationic derivatives of hemicelluloses from corn husk was carried out by the reaction of hemicelluloses with 2,3-epoxypropyltrimethylammonium chloride (ETA) in aqueous sodium hydroxide. The characterization of the cationic derivatives was carried out by elemental analysis, Fourier Transformed Infrared Spectroscopy (FTIR) and Thermogravimetri
Quím. Nova. Publicado em: 2017-01
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28. A Simple Way to Produce γ-Alumina From Aluminum Cans by Precipitation Reactions
Abstract In this paper, a new way for γ-alumina synthesis was proposed, the raw material being aluminum powders obtained by high-energy milling of aluminum cans. This seems a good option for this metal recycling and energy saving, as well as hydrogen production. The materials were prepared by precipitation techniques, in which aluminum powders reacted with
Mat. Res.. Publicado em: 21/07/2016
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29. Strategies for corrosion inhibition of slurry pipelines prior to commissioning
Abstract A practice used to prevent corrosion in buried slurry pipelines is the hibernation of pipelines with an aqueous solution containing corrosion inhibitors before beginning the mining operation. The aim of this work is to evaluate the corrosion resistance of API 5L X70 steel used in the slurry pipelines in hibernation solution containing sodium sulphit
Rem: Rev. Esc. Minas. Publicado em: 2016-06
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30. METODOLOGIA EXPERIMENTAL PARA REAÇÕES GÁS-LÍQUIDO
Although the gas-liquid reactions are employed in many industrial processes, this issue in the most of time is not included in the curriculum of Chemistry and Chemical Engineering courses. This work aims to propose the study of gas-liquid reaction for the degree course, considering a widespread system, the reaction of CO2-NaOH. A reaction mechanism was propo
Quím. Nova. Publicado em: 2016-06
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31. Antimicrobial Potential of Bio-Oil for Use in Diesel Oil B10
The aim of this study was to evaluate the antimicrobial activity of bio-oil (obtained by pyrolysis of biomass: soybean oil, eucalyptus sawdust and coffee grounds) added to the blend B10 (diesel and biodiesel). The bio-oil is compatible to diesel oil and it contains promising compounds that can exhibit antimicrobial activity during fuel storage. We evaluated
J. Braz. Chem. Soc.. Publicado em: 2016-01
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32. Value addition of corn husks through enzymatic production of xylooligosaccharides
ABSTRACT Corn husks are the major wastes of corn industries with meagre economic significance. The present study was planned for value addition of corn husk through extraction of xylan, followed by its enzymatic hydrolysis into xylooligosaccharides, a pentose based prebiotic. Compositional analysis of corn husks revealed neutral detergent fibre 68.87%, acid
Braz. arch. biol. technol.. Publicado em: 2016
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33. Physicochemical, Mechanical and Morphologic Characterization of Purple Banana Fibers
Weather conditions and the Brazilian fertile soil contribute to abundant natural resources in a wide variety of fiber types. These fibers have attracted interest in Materials Science area for such characteristics as: low cost, high elasticity modulus and renewability. In this context, the objective of this work was physical, chemical and morphological charac
Mat. Res.. Publicado em: 04/12/2015
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34. Pre-heating mitigates composite degradation
ABSTRACT Dental composites cured at high temperatures show improved properties and higher degrees of conversion; however, there is no information available about the effect of pre-heating on material degradation. Objectives This study evaluated the effect of pre-heating on the degradation of composites, based on the analysis of radiopacity and silver penet
J. Appl. Oral Sci.. Publicado em: 2015-12
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35. Studies on the Thermal, Mechanical and Chemical Resistance Properties of Natural Resource Derived Polymers
Cardanol-based epoxidized resole resins (ERCF) were synthesized by reacting resole type phenolic resin (RCF) and epichlorohydrin in basic medium, at 120 °C. Resole type phenolic resins were synthesized by reacting cardanol (C) and formaldehyde (F) in the presence of sodium hydroxide, as catalyst, at five different temperatures ranging between 60-80 °C with
Mat. Res.. Publicado em: 03/11/2015
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36. AVALIAÇÃO DE DIFERENTES REAGENTES COLORIMÉTRICOS PARA A DETERMINAÇÃO DE FORMALDEÍDO EM AMOSTRAS DE AR EM AMBIENTES INTERNOS
Different colorimetric reagents, the Nash reagent (acetylacetone/ammonia solution), Purpald (4-amino- 3-hydrazino-5-mercapto-1,2,4-triazole/sodium hydroxide solution) and 3-methyl-2-benzothiazolinone hydrazone (MBTH), were evaluated for the determination of formaldehyde in indoor air samples. Analytical parameters such as color stability of the product fo
Quím. Nova. Publicado em: 2015-07