Scanning Electronic Microscopy
Mostrando 13-24 de 234 artigos, teses e dissertações.
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13. Pollen morphology of Brazilian species of Verbesina L. (Heliantheae - Asteraceae)
Abstract There are nine species of the plant genus Verbesina in Brazil, which are distributed in the Northeast, Center-West, Southeast and South regions of the country. The objective of the present study was to describe the pollinic morphology of eight of these species to better characterize them and evaluate potential species-level taxonomic characters. Ace
Acta Bot. Bras.. Publicado em: 31/01/2019
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14. Effect of sawdust as porosity agent on final properties of geopolymers
Abstract The geopolymers synthesis are based on geopolymerization, a sequence of reactions processed in an alkaline medium through oligomers providing a three-dimensional molecular structure. In this work, the polycondensation of metakaolin was performed with alkaline activators (NaOH and sodium silicate), wood sawdust and other additives. Two different comp
Cerâmica. Publicado em: 2019-01
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15. Efectos de tratamientos térmicos post-alcalinos sobre las propiedades superficiales de titanio para implantes dentales con diferentes recubrimientos
ABSTRACT Titanium is widely used as dental implant since it is bio-inert and osseointegratable. However, provided that this material cannot induce bone growth from its surface, it is usual to carry out different surface treatments in order to develop bioactive coatings that increase both the initial rate of bone development and the biological anchorage of im
Matéria (Rio J.). Publicado em: 19/07/2018
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16. Color electron microprobe cathodoluminescence of Bishunpur meteorite compared with the traditional optical microscopy method
Abstract Cathodoluminescence (CL) imaging is an outstanding method for sub classification of Unequilibrated Ordinary Chondrites (UOC) - petrological type 3. CL can be obtained by several electron beam apparatuses. The traditional method uses an electron gun coupled to an optical microscope (OM). Although many scanning electron microscopes (SEM) and electron
REM, Int. Eng. J.. Publicado em: 2018-04
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17. Synthesis and Characterization of LiCoO2 from Different Precursors by Sol-Gel Method
Lithium cobalt oxide, LiCoO2, widely used as cathode in lithium ion batteries was synthesized and their structural and electronic properties investigated. The crystalline powders were prepared by the sol-gel method with four complexing agents: citric acid, glycine, starch and gelatin. These syntheses were compared with the blank test (without complexing agen
J. Braz. Chem. Soc.. Publicado em: 2017-11
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18. Influence of mixing methods on the properties of high density polyethylene nanocomposites with different carbon nanoparticles
ABSTRACT In this paper, nanocomposites with multiwalled carbon nanotubes (MWCNT) or graphene nanosheets were prepared using a high density polyethylene (HDPE) matrix. Two different processes were employed: a solution method and a melt mixing method. The crystallinity index of the HDPE showed similar levels in nanocomposites after the addition of carbon nanot
Matéria (Rio J.). Publicado em: 02/10/2017
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19. Copaiba Oil and Its Constituent Copalic Acid as Chemotherapeutic Agents against Dermatophytes
Copaiba oil, an oleoresin extracted from Copaifera genus, has been widely used in popular medicine for the treatment of several diseases. The aim of this study was to investigate the antifungal activity of the copaiba oil and its isolated compounds caryophyllene oxide, copalic acid and acetoxycopalic acid against Trichophyton rubrum, Trichophyton mentagrophy
J. Braz. Chem. Soc.. Publicado em: 2017-08
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20. Role of Cured Epoxy and Block Copolymer Addition in Mechanical and Thermal Properties of Polyethylene
This work aims to investigate the role of epoxy addition in high density polyethylene (HDPE) matrix. The block copolymer polyethylene-b-poly (ethylene glycol) (PEG-co-PE) was used as a compatibilizer. The samples were obtained by melt mixing using a torque rheometer. Instrumental nanoindentation was used to determine Young's modulus and nanohardness, thermal
Mat. Res.. Publicado em: 10/07/2017
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21. Inclusion complex of amiodarone hydrochloride with cyclodextrins: preparation, characterization and dissolution rate evaluation
ABSTRACT This study aimed to improve the water solubility of amiodarone hydrochloride (AMH) via inclusion complexes with β-cyclodextrin, methyl-β-cyclodextrin and 2-hydroxypropyl-β-cyclodextrin. Inclusion complexes were developed by physical mixture, coevaporation, spray-drying and freeze-drying. Solid state analysis was performed using X-ray powder diffr
Braz. J. Pharm. Sci.. Publicado em: 22/06/2017
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22. Evaluation of Corrosion Caused by the use of In Natura Biogas in Steam Generator Boilers of Carbon Steel Structural Elements
This work evaluates the corrosion process caused by the presence of hydrogen sulfide in the biogas in natura, in steels commonly used in the construction of steam generator boilers, simulating conditions close to those found on the real application of these materials, exposing the test bodies directly to biogas in natura, flame of combustion and gases result
Mat. Res.. Publicado em: 10/04/2017
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23. Zymomonas mobilis IMMOBILIZED ON LOOFA SPONGE AND SUGARCANE BAGASSE FOR LEVAN AND ETHANOL PRODUCTION USING REPEATED BATCH FERMENTATION
Abstract Two experiments were carried out using loofa sponge and sugarcane bagasse as immobilization support. First a 2(5-2) design of experiments was realized with the following independent variables: sucrose concentration; pH; incubation time and agitation. Based on the best results observed in this experiment, the capacity for reuse of the supports in sub
Braz. J. Chem. Eng.. Publicado em: 2017-04
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24. Mechanical and Thermo-Physical Properties of Short Glass Fiber Reinforced Polybutylene Terephthalate upon Aging in Lubricant/Refrigerant Mixture
In this study, the relationship between structure and mechanical properties of aged PBT composite was investigated. Short glass fiber reinforced PBT composites were subjected to aging tests in environments typically found in hermetic compressors. Diffusion kinetics were addressed by a periodic control of samples weight, and samples aged in oil presented mass
Mat. Res.. Publicado em: 29/09/2016