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Letteratura scientifica selezionata sul tema "Bismuth trioxide"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Bismuth trioxide"

1

Wang, Bing, Junhua Wang, Aimin Chang e Jincheng Yao. "Bismuth trioxide-tailored sintering temperature, microstructure and NTCR characteristics of Mn1.1Co1.5Fe0.4O4 ceramics". RSC Advances 9, n. 44 (2019): 25488–95. http://dx.doi.org/10.1039/c9ra04676c.

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2

Leontie, L., M. Caraman, M. Delibaş e G. I. Rusu. "Optical properties of bismuth trioxide thin films". Materials Research Bulletin 36, n. 9 (luglio 2001): 1629–37. http://dx.doi.org/10.1016/s0025-5408(01)00641-9.

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3

Condurache-Bota, Simona, Mirela Praisler, Raluca Gavrila e Nicolae Tigau. "Sandwich heterostructures of antimony trioxide and bismuth trioxide films: Structural, morphological and optical analysis". Applied Surface Science 391 (gennaio 2017): 59–65. http://dx.doi.org/10.1016/j.apsusc.2016.07.033.

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4

Kelly, Zack, e Funsho Ojebuoboh. "Producing bismuth trioxide and its application in fire assaying". JOM 54, n. 4 (aprile 2002): 42–45. http://dx.doi.org/10.1007/bf02701656.

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5

Primathena, Indra, Denny Nurdin, Hendra Hermawan e Arief Cahyanto. "Synthesis, Characterization, and Antibacterial Evaluation of a Cost-Effective Endodontic Sealer Based on Tricalcium Silicate-White Portland Cement". Materials 14, n. 2 (15 gennaio 2021): 417. http://dx.doi.org/10.3390/ma14020417.

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Mineral trioxide aggregate (MTA) is an ideal yet costly endodontic sealer material. Tricalcium silicate-white Portland cement (TS-WPC) seems to have similar characteristics to those of MTA. This work aims to characterize a modified TS-WPC and evaluate its antibacterial properties as a potential endodontic sealer material. The modified TS-WPC was synthesized from a 4:1 mixture of sterilized Indocement TS-WPC and bismuth trioxide using a simple solution method with 99.9% isopropanol. The mixture was stirred until it was homogenous, centrifuged, and dried. The material was then characterized using infrared spectroscopy, X-ray diffraction, and electron microscopy and subjected to antibacterial evaluation against Enterococcus faecalis using a Mueller–Hinton agar inhibition test. The results showed that the material was characterized by main functional groups of hydroxyls, silicate, bismuth trioxide, and tricalcium silicate, like those of a commercial MTA-based sealer, both tested after hydration. Modified TS-WPC before hydration showed similar powder morphology and size to the commercial one, indicating the ease of manipulation. Both materials exhibited antibacterial activity due to calcium dihydroxide’s ability to absorb carbon dioxide, which is essential for the anaerobic E. faecalis, with minimum inhibitory effect and bactericidal concentrations of 12,500 ppm and 25,000 ppm, respectively. The modified TS-WPC has the potential to become a cost-effective alternative endodontic sealer material.

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6

Ismail, Raid A. "Characteristics of Bismuth trioxide film prepared by rapid thermal oxidation". e-Journal of Surface Science and Nanotechnology 4 (2006): 563–65. http://dx.doi.org/10.1380/ejssnt.2006.563.

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7

Liang, Tao-tao, e Xiao-gang Guo. "Remarkably Facile Preparation of Superhydrophobic Functionalized Bismuth Trioxide (Bi2O3) Coatings". Applied Sciences 9, n. 13 (29 giugno 2019): 2653. http://dx.doi.org/10.3390/app9132653.

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Herein, a novel superhydrophobic functionalized nano-Bi2O3 coating is designed and fabricated using electrophoretic assembly deposition (EAD) in the optimal suspension of polyethylene glycol, ethanol, acetylacetone, and surface functionalization. The small size (70 nm, nano-scale) of Bi2O3 particles and uniform distribution make the target film possessing a promising structure for realizing hydrophobic functionalization. Moreover, the hydrophobicity and stability results indicate that the product has a high-water contact angle (CA) of ca. 167° and is kept almost stable after 180 days exposure in the natural environment. These findings will provide new insight into a better design of superhydrophobic functional coatings via this facile method, holding great promise for future various applications.

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8

Puszynski, Jan A., Christopher J. Bulian e Jacek J. Swiatkiewicz. "Processing and Ignition Characteristics of Aluminum-Bismuth Trioxide Nanothermite System". Journal of Propulsion and Power 23, n. 4 (luglio 2007): 698–706. http://dx.doi.org/10.2514/1.24915.

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9

Eberl, Joachim, e Horst Kisch. "Mineralization of Phenol and 4-Chlorophenol Induced by Visible Light and Assisted by Semiconducting β-Bi2O3". Zeitschrift für Naturforschung B 65, n. 3 (1 marzo 2010): 399–404. http://dx.doi.org/10.1515/znb-2010-0325.

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Intensely yellow β -bismuth trioxide in the form of about 41 nm large crystallites has been prepared by thermal decomposition of (BiO)2CO3 at 400 ◦C. From the band gap energy of 2.3 eV obtained under the assumption of an indirect band-to-band transition and the quasi-Fermi level of −0.28±0.02 V (vs. NHE) a valence band edge position of 2.02 V is calculated. This semiconducting oxide assists a Vis light (λ ≥455 nm) aerial mineralization of the aqueous model pollutants phenol and 4-chlorophenol exhibiting maximum rates at a bismuth oxide concentration of 2.0 g L−1. In the absence of oxygen no degradation occurs indicating that β -Bi2O3 does not act as oxidizing agent. The mineralization suffers from photocorrosion of β -Bi2O3 generating a mixture of α-Bi2O3 and various bismuth carbonates as observed upon multiple use of the oxide in the mineralization of phenol.

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10

Liu, Li Hua, Jun Wu, Xin Li e Zhu Qing Gong. "Preparation of High-Purity Nanometer Bismuth Trioxide from Silver-Zinc Slag". Advanced Materials Research 156-157 (ottobre 2010): 785–93. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.785.

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Silver-zinc slag, containing a lot of Bi, Ag, Cu, Zn, Pb and a little Au, has high comprehensive utilization value. This paper describes a preparation method of high-purity nanometer bismuth trioxide (Bi2O3) from silver-zinc slag by hydrometallurgical method. The results showed that Bi could be effectively leached out from silver-zinc slag using sodium chlorate, hydrochloric acid and sodium chloride as leaching agents, and the leaching rate of Bi was up to 99.03% under the optimum conditions. The contents of Pb2+ and Ag+ in BiCl3 solution could be reduced to about 1mg/L by using silver-zinc slag as reductant and sodium iodide (NaI) as precipitant, respectively. Crystalline form of Bi2O3 is affected greatly by concentration of NaOH, conversion temperature and time. The suitable temperature of BiOCl converting to Bi2O3 was 90 , and the suitable surfactant was polyvinyl alcohol. The average particle size of Bi2O3 obtained was about 86 nm, the purity of Bi2O3 was up to 99.75%, and the yield was 98.21%.

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Più fonti

Tesi sul tema "Bismuth trioxide"

1

Namjoshi, Shantanu A. "Interfacial properties of mixed conductors based on bismuth oxide for oxygen separation". Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/20205.

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2

Webster, Nathan A. S. "New fluorite-type Bi2O3-based solid electrolytes : characterisation, conductivity and crystallography". University of Western Australia. School of Biomedical and Chemical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0092.

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[Truncated abstract] New, double-doped, Bi2O3-based materials in the Bi2O3 Ln2O3 PbO (Ln = La, Nd, Er and Yb) and Bi2O3 WO3 PbO systems were prepared using solid-state reactions. For the Bi2O3 Er2O3 PbO and Bi2O3 Yb2O3 PbO systems, the air-quenchable compositional domain of the fcc fluorite-type phase was partially established. Temperature dependent conductivity measurements were performed on these quenched-in fluorite-type materials using AC impedance spectroscopy. Conductivity at 750[degrees Celsius] generally increased with increasing Pb2+/Ln3+ and decreasing (Ln3++Pb2+)/Bi3+ ratios. The material (BiO1.5)0.70(ErO1.5)0.15(PbO)0.15 had a conductivity of 0.66 [plus-minus] 0.05 S cm-1 at 750[degrees Celsius], placing it among the most highly conductive Bi2O3-based materials, and was the best new fluorite-type material from a combined conductivity and structural stability viewpoint. Some of the new materials in the Bi2O3 La2O3 PbO and Bi2O3 Nd2O3 PbO systems appeared to have the quenched-in fluorite type structure based on powder X-ray diffraction data. These materials had very high conductivities at 750[degrees Celsius] of `~ 1 S cm-1, but underwent rapid symmetry lowering transformations during heating, thus making them unsuitable for use as solid electrolytes. The fluorite-type structure was not air-quenchable in the Bi2O3 WO3 PbO system, for the compositions synthesised. Room temperature neutron powder diffraction data were collected for quenched-in fluorite-type materials in the (BiO1.5)0.80(LnO1.5)0.20-x(PbO)x, Ln = Er and Yb, x = 0, 0.03, 0.06 and 0.09, and (BiO1.5)0.97-y(ErO1.5)y(PbO)0.03, y = 0.27, 0.17 and 0.12, series. ... This suggests that Pb2+ dopant cations occupy face-centre positions in the fcc unit cell, and the Pb2+ lone pair electrons are likely to be orientated towards an oxide ion vacancy in an adjacent tetrahedral site. Pb2+/oxide ion vacancy interactions affect the migration of oxide ions/oxide ion vacancies through the structure, and are responsible for the significantly larger activation energy for oxide ion migration in the Pb2+-doped materials relative to the Pb2+-free materials. For example, the activation energies of (BiO1.5)0.80(ErO1.5)0.20-x(PbO)x, x = 0.03 and 0.06, were 1.50 [plus-minus] 0.02 and 1.54 [plus-minus] 0.02 eV, respectively, while the activation energy for (BiO1.5)0.80(ErO1.5)0.20 was 1.25 [plus-minus] 0.04 eV. Long-term annealing of the quenched in fluorite-type materials in the Bi2O3 Er2O3 PbO and Bi2O3 Yb2O3 PbO systems at 500 and 600[degrees Celsius] resulted in conductivity lowering structural transformations, making these materials unsuitable for practical use as solid electrolytes at these temperatures. For example, the materials (BiO1.5)0.80(ErO1.5)0.20-x(PbO)x, x = 0.03, 0.06 and 0.09, underwent a fluorite-type to tetragonal transformation during annealing at 500[degrees Celsius] due to <100> oxide ion vacancy ordering, and the rate of conductivity decay at 500[degrees Celsius] increased with increasing Pb2+/Er3+ ratio. Long-term annealing experiments at 500[degrees Celsius] performed on air quenched (Bi2O3)0.705(Er2O3)0.245(WO3)0.050 showed that the disordered fluorite-type structure of this material was not fully stabilised, as evidenced by the presence of superlattice reflections in selected area electron diffraction patterns for the material annealed for 2000 hours, and a gradual conductivity decay after ~ 150 hours annealing.

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3

Silva, Marina Angélica Marciano da. "Avaliação da reação tecidual e da radiopacidade do cimento Portland acrescido de diferentes concentrações de óxido de bismuto: estudo em tecido subcutâneo de ratos". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/25/25147/tde-16082011-103411/.

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A radiopacidade e a resposta tecidual do cimento Portland (CP) acrescido de óxido de bismuto (OB) nas concentrações de 0, 15, 20, 30 e 50%, determinadas em peso, foram avaliadas. Para a análise da radiopacidade, foi seguida a norma ISO 6876/2001. A densidade radiográfica foi mensurada em milímetros de alumínio (mmAl) e a análise estatística realizada utilizando-se os testes de ANOVA e Tukey-Kramer (p<0,05). Para a análise da resposta tecidual foram selecionados 81 ratos albinos e cada um recebeu como implante, na região dorsal, dois tubos de polietileno preenchidos com os cimentos experimentais. Os ratos foram mortos após 15, 30 e 60 dias. Na análise microscópica foram avaliados dois parâmetros: células inflamatórias e fenômeno reparatório. Os escores foram determinados e submetidos à análise estatística, utilizando-se os testes não paramétricos de Kruskal-Wallis e Dunn (p<0,05). Os resultados demonstraram que os valores representativos da radiopacidade aumentaram, gradativamente, de acordo com a concentração de óxido de bismuto. A significância estatística foi verificada entre o CP/50%OB e os demais cimentos avaliados, e entre o CP puro e o CP/30%OB (p<0,05). A radiopacidade apresentada pelo CP puro foi abaixo do mínimo (3 mmAl) recomendado pelas normas nº 57 da ADA e da ISO 6876/2001. Na análise da resposta tecidual, em relação à intensidade do infiltrado inflamatório, ocorreu diminuição de 15 para 30 dias e de 15 para 60 dias, com significância estatística (p<0,05), apenas para o grupo II nos dois intervalos de tempos. Com referência ao fenômeno reparatório ocorreu, em geral, para todos os grupos aumento do tecido fibrocelular, do período de 15 para o de 60 dias. Os resultados obtidos permitiram concluir que 15 a 20% de óxido de bismuto é suficiente para proporcionar ao CP a radiopacidade mínima recomendada pelas normas ADA e ISO. A diminuição do infiltrado inflamatório associada ao aumento do tecido fibrocelular, fundamentam a ausência de citotoxicidade do óxido de bismuto incorporado ao CP.
The aim of the study was to evaluate the radiopacity and subcutaneous tissue response of Portland cement (PC) with different concentrations of bismuth oxide (BO). PC was mixed with 0, 15, 20, 30 and 50% of BO determined in weight. The radiopacity was performed according to the ISO 6876/2001 standard for dental root canal sealing materials Statistical analysis was performed using ANOVA and Tukey-Kramer tests (p<0.05). For biocompatibility test, eighty-one albino rats (Rattus norvegicus) were selected. Two subcutaneous pockets were created in animal dorsum and polyethylene tubes filled with the cements were implanted. The rats were sacrificed at 15, 30 and 60 days after implantation. Histological evaluations were classified according to inflammatory response and repair process and scores were established. Statistical analysis was performed using the Kruskal-Wallis and Dunn tests (p<0.05). The results showed that there were statistical differences in radiopacity among PC with 50% of BO and all the other evaluated concentrations (p<0.05). Also, there was statistical difference between PC with 30% of BO and PC without BO (p<0.05). No statistical differences were found for inflammatory response in all the evaluated groups in each period (p>0.05). For repair process evaluation was observed a significant increase in fiber cellular tissue through the periods for all the groups (p<0.05). The tests suggested that 15 to 20% of BO added to PC attended ISO requirements for radiopacity. For biological response, there were decreases in the inflammatory response associated with an increase in the repair process, suggesting the lack of toxicity of BO added to PC.

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4

Pires, Tatiana Rafaela Lopes. "Comparative analysis of chromatic alterations of a Calcium Silicate-based Material: in vitro study". Master's thesis, 2014. http://hdl.handle.net/10316/36720.

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Trabalho final do 5º ano com vista à atribuição do grau de mestre no âmbito do ciclo de estudos de Mestrado Integrado em Medicina Dentária apresentado à Faculdade de Medicina da Universidade de Coimbra.
Objective: The purpose of this study was to investigate and compare chromatic alterations of an inorganic silicate-based cement, also known as white mineral trioxide aggregate (WMTA), submitted to different environmental conditions using the CIE L*a*b* system evaluated by two different methods. Methods: Twenty-four samples of WMTA (ProRoot® MTA, Dentsply Tulsa Dental, Johnson City, TN) were randomly distributed in four groups (n=4). In group 1 the samples did not undergo any additional treatment (negative control group). In group 2 WMTA samples were light irradiated for 60 seconds using a LED poliwave curing unit. In group 3 and 4 WMTA samples were coated with a layer of glycerine and adhesive, respectively and light irradiated for 60 seconds. A commercial spectrophotometer (VITA Easyshade® Advance 4.0, VidentTM, California, USA) and calibrated photographic digital analysis were used to determine colour coordinates from the CIE L*a*b* system of each sample after three different time points: 30 minutes, 48 hours and 7 days. In order to understand the chemical alterations associated to colour variations of the material x-ray diffraction analysis was also conducted. Data was analysed using statistical software IBM® SPSS® Statistics, version 20. Results: Consistency between the two colour measuring methods was not observed. Significant colour variation was observed for group 3. X-ray diffraction analysis showed no differences between compounds. Conclusion: WMTA showed significant dark discolouration after irradiation with an LED poliwave curing unit in an oxygen-free environment promoted by glycerine although after 48 hours discolouration had faded. The same light irradiation protocol associated to an oxygen-free conditions achieved by an adhesive resin layer did not induce significant discolouration at the end of the experiment protocol.

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5

Kalombo, Lonji. "Evaluation of Bi2O3 and Sb6O13 as oxidants for silicon fuel in time delay detonators". Diss., 2005. http://upetd.up.ac.za/thesis/available/etd-08192008-084820/.

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Capitoli di libri sul tema "Bismuth trioxide"

1

Yuan, Bo, Yuta Yoshino, Toshikazu Kaise e Hiroo Toyoda. "Application of Arsenic Trioxide Therapy for Patients with Leukaemia". In Biological Chemistry of Arsenic, Antimony and Bismuth, 263–92. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470975503.ch11.

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2

"bismuth trioxid(e)". In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 128. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_21651.

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