Sergio Mazurek Tebcherani
@uepg.br
Chemistry Department
State University of Ponta Grossa
RESEARCH, TEACHING, or OTHER INTERESTS
Chemistry, Materials Science, Industrial and Manufacturing Engineering
Scopus Publications
Scopus Publications
Tiago Moreira Bastos Campos, Claudinei dos Santos, Larissa Marcia Martins Alves, Ernesto B. Benalcazar-Jalkh, Henrico Badaoui Strazzi-Sahyon, Edmara T.P. Bergamo, Sérgio Mazurek Tebcherani, Lukasz Witek, Paulo G. Coelho, Satoshi Yamaguchi,et al.
Elsevier BV
Ernesto B. Benalcázar-Jalkh, Edmara T. P. Bergamo, Tiago M. B. Campos, Paulo G. Coelho, Irena Sailer, Satoshi Yamaguchi, Larissa M. M. Alves, Lukasz Witek, Sérgio M. Tebcherani, and Estevam A. Bonfante
MDPI AG
Dental zirconias have been broadly utilized in dentistry due to their high mechanical properties and biocompatibility. Although initially introduced in dentistry as an infrastructure material, the high rate of technical complications related to veneered porcelain has led to significant efforts to improve the optical properties of dental zirconias, allowing for its monolithic indication. Modifications in the composition, processing methods/parameters, and the increase in the yttrium content and cubic phase have been presented as viable options to improve zirconias’ translucency. However, concerns regarding the hydrothermal stability of partially stabilized zirconia and the trade-off observed between optical and mechanical properties resulting from the increased cubic content remain issues of concern. While the significant developments in polycrystalline ceramics have led to a wide diversity of zirconia materials with different compositions, properties, and clinical indications, the implementation of strong, esthetic, and sufficiently stable materials for long-span fixed dental prostheses has not been completely achieved. Alternatives, including advanced polycrystalline composites, functionally graded structures, and nanosized zirconia, have been proposed as promising pathways to obtain high-strength, hydrothermally stable biomaterials. Considering the evolution of zirconia ceramics in dentistry, this manuscript aims to present a critical perspective as well as an update to previous classifications of dental restorative ceramics, focusing on polycrystalline ceramics, their properties, indications, and performance.
Daiane Maria De Genaro Chiroli, Maria Gabriela Menezes, Fernanda Cavicchioli Zola, Franciely Veloso Aragão, Rafael Dezotti de Almeida, and Sergio Mazurek Tebcherani
Elsevier BV
Robson Couto da Silva, Felipe de Almeida La Porta, Graciela Aparecida dos Santos Silva, Renato Mandalozzo Tebcherani, Evaldo Toniolo Kubaski, Estevam Augusto Bonfante, and Sergio Mazurek Tebcherani
Wiley
AbstractThis research used a factorial model containing two levels and three variables to evaluate the partial substitution of sodium feldspar (albite) by a talc ore found in abundance in the region of Itaiacoca—Brazil. The model can also be used to verify the influence of initial talc particle size, proportion, and sintering threshold temperature on the following physical properties, such as linear shrinkage, water absorption, bulk density, total porosity, and firing color. In this study, the mechanical strength of the compositions was evaluated by the flexural strength test. The factorial model indicated the sintering temperature as the variable that most affects the samples’ densification and the proportion of talc as the variable that changes the firing color. The experiment that used a higher sintering temperature combined with a coarser talc granulometry presented the highest mechanical strength. When more refined granulometry was used, there was the beginning of an overfire process. Water absorption values in the range of .04% and modulus of rupture of 49 MPa were obtained, confirming the talc's effectiveness as a secondary flux agent suitable for the formulation of ceramic bodies.
Ernesto B. Benalcázar Jalkh, Edmara T.P. Bergamo, Tiago M.B. Campos, Everardo N.S. de Araújo-Júnior, Adolfo C.O. Lopes, Sérgio M. Tebcherani, Satoshi Yamaguchi, Luis A. Genova, Petra C. Gierthmuehlen, Lukasz Witek,et al.
Elsevier BV
Letícia Guerreiro da Trindade, Ana Carolina Borba Rocha, Vinícius Teodoro, Vinicius Tineu da Silva, Aline Barrios Trench, Eloisa Cordoncillo, Marcio Daldin Teodoro, Sergio Mazurek Tebcherani, Elson Longo, and Tatiana Martelli Mazzo
Materials Research Bulletin Elsevier BV
Sindy Salomão, Débora Cristiane Sampaio de Oliveira, Evaldo Toniolo Kubaski, Adriana Scoton Antonio Chinelatto, Robson Couto da Silva, and Sergio Mazurek Tebcherani
Elsevier BV
Tainara Rigotti de Castro, Dayana Carla de Macedo, Daiane Maria de Genaro Chiroli, Robson Couto da Silva, and Sergio Mazurek Tebcherani
Springer Science and Business Media LLC
Robson Couto da Silva, Fabio Neves Puglieri, Daiane Maria de Genaro Chiroli, Guilherme Antonio Bartmeyer, Evaldo Toniolo Kubaski, and Sergio Mazurek Tebcherani
Elsevier BV
Juliana Schultz, Gino Capobianco, Paulo Apolinário da Silva Veiga, Mayara Regina Fornari, Ariana Rodrigues Antonangelo, Sergio Mazurek Tebcherani, Antonio Salvio Mangrich, and Sidnei Antonio Pianaro
Springer Science and Business Media LLC
Regiane Gordia Drabeski, Jaqueline Valeski Gunha, Andressa Novatski, Gelson Biscaia de Souza, Sergio Mazurek Tebcherani, Evaldo Toniolo Kubaski, and Daniele Toniolo Dias
Elsevier BV
Manuella Candéo, Maria Helene G Canteri, Dayana Carla de Macedo, Evaldo T Kubaski, and Sergio M Tebcherani
FapUNIFESP (SciELO)
ABSTRACT Plastic packaging from petroleum derives used in the food industry represents serious environmental problems. Alternative solutions to these problems consist of the development of biodegradable packaging, such as films and edible coatings including the polyvinyl alcohol (PVA). In this research we evaluated the effect of the PVA application by two different techniques aiming to increase shelf life of ripe tomatoes, cultivar Carmen. The methodology of this study consisted in covering tomatoes with a PVA solution and also with PVA impregnated tracing paper. The different fruit lots were kept in polystyrene trays for 19 days on a laboratory bench at a controlled temperature of 25±3ºC. The fruit analyzes were compared to the control fruits without any treatment, being evaluated firmness, pH, titratable total acidity, mass loss, total soluble solids content, water activity and color determination of fruit surface. Among the different treatments, the PVA coating applied directly to the fruits contributed to control the firmness and the mass loss, as well as this treatment influenced the total soluble solids content, the luminosity and the red color of fruits with statistical difference compared to the control and covered with tracing paper (with or without PVA). The PVA coating solution applied directly on the fruits contributed to maintain the postharvest quality of the ripe tomatoes.
Robson C. da Silva, Evaldo T. Kubaski, and Sergio M. Tebcherani
Wiley
AbstractGlass foams have great potential for several technological applications, for example, filters and thermal or acoustic insulators. Sodium hydroxide is an efficient foaming agent to obtain glass foams with high level of porosity. However, the control of variables that influences on structure, type, and size of pores of glass foams is necessary. This study evaluates the influence of composition and process parameters on glass foams based on soda‐lime glass waste, sodium hydroxide, and borax. Experiments were conducted using factorial designs. According to the experimental conditions, bulk density varied from 0.16 to 0.79 g cm−3 and maximum porosity of 92%. Amounts of NaOH and borax in addition to sintering temperature are the main variables of the foaming process. The role of NaOH content is to reduce the density and closed porosity of glass foams associated with an increase in their open porosity. The addition of borax with low NaOH amount promoted densification and pore closure in glass foams. NaOH and borax content allows controlling the type of predominant porosity on foams (open or closed porosity). Glass foams were resistant to sulfuric acid, hydrochloric acid, and nitric acid in diluted solutions. These results allow controlling the pore structure of glass foams for different applications.
Samara Schmidt, Evaldo T. Kubaski, Diogo P. Volanti, Thiago Sequinel, Vinicius D. N. Bezzon, and Sergio M. Tebcherani
Informa UK Limited
ABSTRACT Materials based on bismuth(III) oxide are candidate to be used in optical and electronic devices because of their properties such as a variable band gap, photoconductivity, photoluminescence, high refractive index, and dielectric permittivity. These properties are dependent of several factors, e.g., present phases and crystal morphology. The microwave-assisted hydrothermal method (MAH) is a fast and efficient approach of synthesis to obtain semiconductor powders. However, the synthesis of monoclinic bismuth oxide (α-Bi2O3) with acicular morphology by MAH was not found in literature. In this paper, microcrystals of acicular α-Bi2O3 (monophasic) were successfully obtained by MAH using a synthesis temperature of 80°C for 0.5 h. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron, and transmission electron microscopies showed the formation of a monoclinic structure (space group P21/c) with acicular morphology that grew along the [001] direction. The temperature and time necessary to synthetize acicular microcrystals were significantly lower than those found for acicular microcrystals obtained by conventional hydrothermal method.
Robson Couto da Silva, Evaldo Toniolo Kubaski, Ernandes Taveira Tenório-Neto, Michele Karoline Lima-Tenório, and Sergio Mazurek Tebcherani
Elsevier BV
Samara Schmidt, Evaldo T. Kubaski, Máximo Siu Li, Vinicius D.N. Bezzon, Thiago Sequinel, and Sergio M. Tebcherani
Wiley
AbstractMonoclinic bismuth oxide (α‐Bi2O3) has attractive optical properties and, therefore, its photoluminescence (PL) behavior has been increasingly explored. Besides this fact, the influence of synthesis methods on PL properties of α‐Bi2O3 still requires research. This paper describes the influence of precipitation (PPT) and microwave‐assisted hydrothermal (MAH) methods on PL properties of acicular α‐Bi2O3 microcrystals. The synthesis method promoted structural modifications on α‐Bi2O3, in particular PPT increased the density of oxygen vacancies significantly. As a result, the PL properties of samples were different depending on the method of synthesis. PPT samples presented their maximum PL emission at 1.91 eV (red), while MAH samples had their maximum at 2.61 eV (blue). These results indicate the possibility of controlling PL properties of α‐Bi2O3 by simply choosing the adequate synthesis method.
Aline Jorge, Elenise Sauer Leal, Rodrigo Sequinel, Thiago Sequinel, Evaldo Toniolo Kubaski, and Sergio Mazurek Tebcherani
Hindawi Limited
F. N. Viechineski, E. T. Kubaski, S. Schmidt, T. Sequinel, J. A. Varela, and S. M. Tebcherani
Informa UK Limited
ABSTRACT This paper describes the production of transparent hydrophobic polymeric films made of poly(vinyl chloride) and paraffin wax. A liquid polymeric solution was prepared and spray-deposited on silica glass and nonwoven fabric surfaces. The contact angle between water droplets and glass substrate was 102° while that between droplets and nonwoven fabric was 120°. The films exhibited hydrophobic behaviour regardless of the droplet size. Field emission gun scanning electron microscopy revealed complete adhesion of the film on the substrate and a film thickness of 0.16 µm. The atomic force microscopy micrographs showed a nanoscale rough film surface, which was responsible for air entrapment, preventing water from penetrating the film. This fact explains the high contact angle obtained. The raw materials also contributed to the film’s hydrophobicity because of their non-polarity, which prevents miscibility between water droplets and film. GRAPHICAL ABSTRACT
Thiago Sequinel, Samara Schmidt, Evaldo Toniolo Kubaski, José Arana Varela, and Sergio Mazurek Tebcherani
Springer International Publishing
Marcelo Natan Martins, Evaldo Toniolo Kubaski, Thiago Sequinel, Sergio Cava, Mario Lúcio Moreira, and Sergio Mazurek Tebcherani
Elsevier BV
Diogo José Horst, Sergio Mazurek Tebcherani, Evaldo Toniolo Kubaski, and Rogério de Almeida Vieira
Hindawi Limited
This experimental study investigates the bioactive potential of filaments produced via hot melt extrusion (HME) and intended for fused deposition modeling (FDM) 3D printing purposes. The oleo-gum-resins from benzoin, myrrha, and olibanum in pure state and also charged with 10% of metal oxide nanoparticles, TiO2, P25, Cu2O, and MoO3, were characterized by ultraviolet-visible (UV-Vis) and Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray microanalysis (EDXMA), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). Disks were 3D-printed into model geometries (10 × 5 mm) and the disk-diffusion methodology was used for the evaluation of antimicrobial and antifungal activity of materials in study against the clinical isolates:Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, andCandida albicans. Due to their intrinsic properties, disks containing resins in pure state mostly prevent surface-associated growth; meanwhile, disks loaded with 10% oxides prevent planktonic growth of microorganisms in the susceptibility assay. The microscopy analysis showed that part of nanoparticles was encapsulated by the biopolymeric matrix of resins, in most cases remaining disorderly dispersed over the surface of resins. Thermal analysis shows that plant resins have peculiar characteristics, with a thermal behavior similar to commercial available semicrystalline polymers, although their structure consists of a mix of organic compounds.
D. Berger, A.P. de Moura, L.H. Oliveira, W.B. Bastos, F.A. La Porta, I.L.V. Rosa, M.S. Li, S.M. Tebcherani, E. Longo, and J.A. Varela
Elsevier BV
Samara Schmidt, Evaldo T. Kubaski, Diogo P. Volanti, Thiago Sequinel, Vinicius Danilo N. Bezzon, Armando Beltrán, Sergio M. Tebcherani, and José A. Varela
American Chemical Society (ACS)
Materials with high photoluminescence (PL) intensity can potentially be used in optical and electronic devices. Although the PL properties of bismuth(III) oxide with a monoclinic crystal structure (α-Bi2O3) have been explored in the past few years, methods of increasing PL emission intensity and information relating PL emission to structural defects are scarce. This research evaluated the effect of a pressure-assisted heat treatment (PAHT) on the PL properties of α-Bi2O3 with a needlelike morphology, which was synthesized via a microwave-assisted hydrothermal (MAH) method. PAHT caused an angular increase between the [BiO6]-[BiO6] clusters of α-Bi2O3, resulting in a significant increase in the PL emission intensity. The Raman and XPS spectra also showed that the α-Bi2O3 PL emissions in the low-energy region (below ∼2.1 eV) are attributed to oxygen vacancies that form defect donor states. The experimental results are in good agreement with first-principles total-energy calculations that were carried out within periodic density functional theory (DFT).
Aline Jorge, Evaldo Toniolo Kubaski, João Carlos Colmenero, Thiago Sequinel, Rodrigo Sequinel, and Sergio Mazurek Tebcherani
Informa UK Limited
Drying processes are widely employed to add quality and preserve and concentrate high-value foods and pharmaceutical products. However, most drying processes are highly energy and time consuming, which makes them costly, and also cause numerous changes in the product that may impair its quality. Several aspects must be considered in the choice of the type of dryer, because different parameters may imply different purchase costs, energy consumption, and effects on quality. In this study, to simplify the decision-making process, the application of the analytic hierarchy process (AHP) was tested and proved to be satisfactory.