Silica Glass
Mostrando 1-12 de 89 artigos, teses e dissertações.
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1. Bioactive SiO2-K2O-CaO-P2O5 glass-ceramic scaffold prepared using polyurethane foam template
Abstract A glass-ceramic in the SiO2-K2O-CaO-P2O5 quaternary system was prepared by substituting the Na2O component with K2O to avoid Na2Ca2Si3O9 formation upon thermal treatment since this phase decreases apatite formation kinetics on glass material. To form the glass-ceramic, a modified sol-gel method involving solution precipitation, followed by reagents
Cerâmica. Publicado em: 2023
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2. Biogenic synthesis of silver nanoparticles from thyme extract for functionalization of a bioactive glass produced from rice husk ash
Abstract The rice husk, agro-industrial residue, stands out for having silica, the main oxide former of the bioactive glass. To avoid contamination in this biomaterial, substances with bactericidal properties, like silver can be incorporated. Thus, the objective of this work is the synthesis of silver nanoparticles to functionalize a bioactive glass synthesi
Cerâmica. Publicado em: 2022
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3. Use of glass waste in the production of metakaolin-based geopolymer submitted to room temperature and thermal curing
Resumo O metacaulim é a principal matéria-prima utilizada na síntese de geopolímeros, embora a relação entre os teores de sílica e alumina não seja a ideal. Normalmente, o teor de SiO 2 é ajustado com o uso de silicatos presentes na solução ativadora. Uma opção ecoeficiente seria o uso de resíduos de vidro como fonte adicional de sílica. Este
Ambiente Construído. Publicado em: 2022
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4. Zeólita NaA sintetizada sobre fibra de vidro como estratégia para otimização do abrandamento de águas duras
NaA ZEOLITE SYNTHESIZED OVER FIBERGLASS AS A STRATEGY FOR OPTIMIZING HARD WATER SOFTENING. Zeolite NaA has been successfully synthesized over glass fiber surface previously activated by alkaline treatment. By varying the time of the treatment and the amount of silica and alumina precursors used in the reaction mixture, a sample with higher zeolite concentrat
Química Nova. Publicado em: 2022
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5. Evaluation of the stiffening mechanism based on micro-sized particle inclusions in laminated composites
Rigid particles have been incorporated into laminated composites, especially to enhance their bending performance attributed to the stiffening of the matrix phase (i) and the increased interlaminar shear resistance (ii). In order to better evaluate the improvement mechanism provided by the particulate inclusions, this work investigates the incorporation of m
Mat. Res.. Publicado em: 17/10/2019
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6. Systems developed for application as self-cleaning surfaces and/or antimicrobial properties: a short review on materials and production methods
Resumo Esta minirrevisão apresenta materiais e técnicas que têm sido utilizados para a produção de superfícies autolimpantes e/ou antimicrobianas. A partir dos trabalhos analisados constatou-se grande utilização do dióxido de titânio para se obter superfícies com essas propriedades, porém materiais como sílica, zinco e prata também têm sido ut
Cerâmica. Publicado em: 15/08/2019
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7. PRODUCTION AND CHARACTERIZATION OF PRECIPITATED SILICA FROM PALM OIL MILL FLY ASH USING CO2 IMPREGNATION AND MECHANICAL FRAGMENTATION
ABSTRACT In this research, sol-gel precipitation using CO2 impregnation and mechanical fragmentation method was applied to produce precipitated silica from Palm Oil Mill Fly Ash (POMFA). Carbon dioxide (CO2) was used in order to reduce the cost of the process and to enable sodium hydroxide recovery. The precipitation process was done in a stirred temperature
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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8. LIGHT N-PARAFFINS SEPARATION BY INVERSE GAS CHROMATOGRAPHY WITH CUBAN VOLCANIC GLASS
ABSTRACT In this work the applicability of a natural volcanic glass (technological type I material) from Cuba is investigated as adsorbent for separation of mixtures of C1-(C5; C6; C7; C8; C9) hydrocarbons by inverse gas chromatography under flow conditions in a temperature range of 328-343 K. The experimental results indicated that the material was mainly
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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9. Obtaining and characterizing dental hybrid composites with clay or silica nanoparticles and boron-aluminum-silicate glass microparticles
Abstract The aim of the present work was the obtaining and characterization of dental hybrid composites using nanoparticles (clay or silica) and boron-aluminum-silicate microparticles. We evaluated the dispersion of the nanofillers when changing their loading among 2.5%, 5%, 10% and 25% wt. Were tested, in the above quantities, four different types of nanofi
Polímeros. Publicado em: 27/06/2019
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10. Mechanical and bioactivity assessment of wollastonite/PVA composite synthesized from bentonite clay
Resumo Os compósitos de vidro/polímero podem imitar a estrutura natural do osso possuindo uma configuração fibra-matriz que proporciona propriedades físicas e biológicas apropriadas. As cerâmicas de wollastonita são conhecidas por suas bioatividade e biocompatibilidade promissoras quando aplicadas na regeneração óssea. O álcool polivinílico (PVA
Cerâmica. Publicado em: 06/06/2019
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11. The devitrification kinetics of transparent silica glass prepared by gel-casting method
ABSTRACT The kinetics of the crystallization of cristobalite in the amorphous silica glass were studied for samples prepared by gel-casting and sintering in air. Avrami and rate equations were used to calculate the rate constants and the activation energy. The results showed that the crystallization obeys the first order and occurs mainly on the surface with
Matéria (Rio J.). Publicado em: 20/05/2019
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12. Sustainable Glass Foams Produced from Glass Bottles and Tobacco Residue
In this work, discarded soda-lime-silica glass bottles and tobacco residue (after oil extraction to produce biodiesel) were prepared in different formulations to obtain glass foams. The formulated compositions were homogenized and uniaxially compacted at 40 MPa then fired at 850 ºC and 900 ºC for 60 min to investigate the effects of tobacco residue and tem
Mat. Res.. Publicado em: 03/12/2018