Sol Gel
Mostrando 13-24 de 637 artigos, teses e dissertações.
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13. Study of Crystallization and Composition on Silicon Oxycarbide (SiOC) and Silicon Boron Oxycarbide (SiBOC) Ceramics Obtained from Alkoxysilanes Precursors
This work deals on the preparation of silicon oxycarbide (SiOC) and silicon boron oxycarbide (SiBOC) ceramics from pyrolysis involving alkoxysilanes with different organic groups. Boron content, organic substituent and annealing time were evaluated on crystallization and composition of resulting ceramics. B-free precursors composed of methyltriethoxysilane (
J. Braz. Chem. Soc.. Publicado em: 2021-06
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14. Magnetic and Mesoporous Silica-Niobia Material as Modifier of Carbon Paste Electrode for p-Nitrophenol Electrochemical Determination
In the present work, the sol-gel synthesis method was employed as strategy to obtain a magnetic and mesoporous silica-niobia material. The planned synthesis was based on the hetero-condensation of niobium and silicon alkoxide precursors, in the presence of spherical magnetite particles. The resulting material presented interesting characteristics such as mag
J. Braz. Chem. Soc.. Publicado em: 2021-03
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15. Er3+/Yb3+-Doped GdVO4 Obtained by the Non-Hydrolytic Sol-Gel Route and Potential Application as Up-Conversion Thermometer
The properties of lanthanides allow them to be used as contrast agents for magnetic resonance imaging, thereby helping to differentiate between tissues, organs, and pathologies more efficiently. Lanthanides contain thermosensitive energy levels that aid identification of cancer and healthy cells. This work investigates the GdVO4 matrix obtained by the non-hy
J. Braz. Chem. Soc.. Publicado em: 2021-02
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16. Impact of Continuing Education on the Quality of Blood Pressure Measurement
The properties of lanthanides allow them to be used as contrast agents for magnetic resonance imaging, thereby helping to differentiate between tissues, organs, and pathologies more efficiently. Lanthanides contain thermosensitive energy levels that aid identification of cancer and healthy cells. This work investigates the GdVO4 matrix obtained by the non-hy
Int. J. Cardiovasc. Sci.. Publicado em: 2021-02
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17. Síntese e caracterização de biovitrocerâmica com adição de SrO a partir de sílica de casca de arroz
Resumo A casca de arroz é um resíduo abundante no Rio Grande do Sul, Brasil, e pode ser utilizada para produção de sílica pura. As biovitrocerâmicas têm a sílica como principal componente. A biocompatibilidade desses materiais pode ser incrementada adicionando componentes, como SrO. Este trabalho objetivou o uso da sílica proveniente da casca de arr
Cerâmica. Publicado em: 2020-12
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18. Hybrid Hydrogels Based on Polyethylene Glycol Bioconjugated with Silylated-Amyloidogenic Peptides
Hybrid-peptide hydrogel arrangements are a promising alternative to obtaining biocompatible structures at the nanoscopic scale. In this work, a new class of hybrid hydrogels was obtained through the sol-gel process based on the reaction between an amyloid-like octapeptide sequence [RF]4 (where R = arginine and F = phenylalanine) covalently bonded with glycin
J. Braz. Chem. Soc.. Publicado em: 2020-11
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19. Sobre reformas y políticas sanitarias en la España de los últimos años del franquismo y la transición democrática
An organic-inorganic hybrid material based on a silica matrix and functionalized with imidazole group was successfully synthesized by the sol-gel process. The characterization techniques enabled the confirmation of the proposed structure as well as the effectiveness of the imidazole ring functionality in the structure of the material. It is insoluble in wate
Hist. cienc. saude-Manguinhos. Publicado em: 2020-10
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20. Synthesis and Characterization of Hybrid Polymer Based on Functionalized Silica as Efficient Adsorbent for Heavy Metal Ions from Aqueous Solution
An organic-inorganic hybrid material based on a silica matrix and functionalized with imidazole group was successfully synthesized by the sol-gel process. The characterization techniques enabled the confirmation of the proposed structure as well as the effectiveness of the imidazole ring functionality in the structure of the material. It is insoluble in wate
J. Braz. Chem. Soc.. Publicado em: 2020-10
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21. Síntese e caracterização de pó de mulita monofásico derivado de sol-gel
Resumo Pó precursor de mulita microfina de alta pureza de composição estequiométrica, 3Al2O3.2SiO2, foi sintetizado por rota sol-gel usando isopropóxido de alumínio e tetraetoxissilano. O pó precursor de mulita foi caracterizado por área de superfície BET, distribuição de tamanho de partícula, espectroscopia no infravermelho por transformada de F
Cerâmica. Publicado em: 2020-09
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22. Synthesis of ZnO Nanoparticles by the Sol-Gel Protein Route: A Viable and Efficient Method for Photocatalytic Degradation of Methylene Blue and Ibuprofen
The photocatalytic degradation of methylene blue dye and ibuprofen drug was studied in the presence of zinc oxide, synthetized by the protein sol-gel route. The catalyst, calcined at 1000 ºC, presented a tendentious morphology to filaments characteristic of ZnO crystalline, characterized by X-ray diffraction (XRD) and confirmed by the presence of Zn energy
J. Braz. Chem. Soc.. Publicado em: 2020-08
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23. Synthesis, Characterization and Photocatalytic Activity of Au/SiO2@TiO2 Core-Shell Microspheres
By using HAuCl4 as the gold precursor, spherical Au@SiO2/TiO2 core-shell nanostructures were prepared with the sol-gel method and ethanol reflux. The preparation process was convenient and fast. The obtained samples were characterized by UV-Vis, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TE
J. Braz. Chem. Soc.. Publicado em: 2020-03
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24. Efeito da substituição de íons de Y 3+ nas propriedades estruturais, magnéticas e elétricas das nanopartículas de ferrita de cobalto
Resumo Nanopartículas de ferrita de cobalto dopada com Y3+, CoYxFe2-xO4 (x=0,00, 0,05, 0,10, 0,15), foram sintetizadas usando a técnica de autocombustão sol-gel. A estrutura de espinélio cúbico monofásica foi confirmada pela técnica de difração de raios X. O parâmetro da rede aumentou com o aumento do teor de Y3+ na ferrita de cobalto e variou de 8
Cerâmica. Publicado em: 2020-03