This page has only limited features, please log in for full access.
The development of alternatives for wear protection in surface engineering can be responsible for a significant decrease in energy waste as a large amount of the energy produced in the world is lost due to tribological contact. Dynamic Glancing Angle Deposition has been recently evaluated as a route to produce coatings with improved wear performance. In this technique, the substrate oscillates along with a determined range in front of the sputtering target during the growth of the film. In this study, five oscillatory ranges (0, ±5°, ±10°, ±15°, ±20°) were probed to manufacture nanostructured Cr-Al-N coatings using direct current magnetron sputtering, and their impact was investigated on the grain morphology, phase formation, chemical composition, and performance of the coatings. FEG-SEM revealed the formation of multilayer-like architecture across the grains of the coatings. The deposition rate and hardness improved, and a more than 2-fold decrease in the material loss was observed in a comparison between the stationary-deposited conventional coating and the sample produced under ±10° oscillatory range. This indicated the potential use of this technique in future surface engineering applications.
Pedro Renato Tavares Avila; Raíra Chefer Apolinário; Alisson Mendes Rodrigues; Jucielle Veras Fernandes; Romualdo Rodrigues Menezes; Gelmires De Araújo Neves; Haroldo Cavalcanti Pinto. On Improving Wear Resistance of Cr-Al-N Coatings Using Dynamic Glancing Angle DC Magnetron Sputtering. Nanomaterials 2021, 11, 2187 .
AMA StylePedro Renato Tavares Avila, Raíra Chefer Apolinário, Alisson Mendes Rodrigues, Jucielle Veras Fernandes, Romualdo Rodrigues Menezes, Gelmires De Araújo Neves, Haroldo Cavalcanti Pinto. On Improving Wear Resistance of Cr-Al-N Coatings Using Dynamic Glancing Angle DC Magnetron Sputtering. Nanomaterials. 2021; 11 (9):2187.
Chicago/Turabian StylePedro Renato Tavares Avila; Raíra Chefer Apolinário; Alisson Mendes Rodrigues; Jucielle Veras Fernandes; Romualdo Rodrigues Menezes; Gelmires De Araújo Neves; Haroldo Cavalcanti Pinto. 2021. "On Improving Wear Resistance of Cr-Al-N Coatings Using Dynamic Glancing Angle DC Magnetron Sputtering." Nanomaterials 11, no. 9: 2187.
The combination of biocompatible polymers and ceramics shows great promise in the development of composites with suitable mechanical properties for dental applications. In an attempt to further expand this research line, Al2O3 commercial powders (Vitro-ceram, Alglass, In-ceram) were sintered at 1400 °C for 2 h and infiltrated with poly(methyl methacrylate) for potential use in dental prostheses. The infiltration was performed using a homemade apparatus under a pressure of 7 bar for 6 and 12 h. The microstructure (studied using a scanning electron microscope), Archimedes density, 3-point bending flexural strength and Vickers hardness of the prepared composites were assessed and quantitatively compared. In general, microstructural analyses showed ceramic- and polymer-based interpenetrating network in all materials. The preforms infiltrated for 12 h showed superior properties; among them, the Vitro-ceram-based composite also demonstrated a near-zero open porosity and optimum mechanical characteristics. Specifically, its density, strength and hardness were 2.6 ± 0.07 g/cm3, 119.3 ± 5.0 MPa and 1055.1 ± 111.0 HV, respectively, passing the acceptance criteria of ISO 6872 and making it suitable for consideration as a metal-free structure for dental crowns and fixed partial prostheses until three anterior units.
Olimpia Crispim da Silveira; Alisson Mendes Rodrigues; Maziar Montazerian; Hélio De Lucena Lira; Francesco Baino; Romualdo Rodrigues Menezes. Al2O3 Preforms Infiltrated with Poly(methyl methacrylate) for Dental Prosthesis Manufacturing. Applied Sciences 2021, 11, 7583 .
AMA StyleOlimpia Crispim da Silveira, Alisson Mendes Rodrigues, Maziar Montazerian, Hélio De Lucena Lira, Francesco Baino, Romualdo Rodrigues Menezes. Al2O3 Preforms Infiltrated with Poly(methyl methacrylate) for Dental Prosthesis Manufacturing. Applied Sciences. 2021; 11 (16):7583.
Chicago/Turabian StyleOlimpia Crispim da Silveira; Alisson Mendes Rodrigues; Maziar Montazerian; Hélio De Lucena Lira; Francesco Baino; Romualdo Rodrigues Menezes. 2021. "Al2O3 Preforms Infiltrated with Poly(methyl methacrylate) for Dental Prosthesis Manufacturing." Applied Sciences 11, no. 16: 7583.
Tailing incorporation into mortars has been the subject of much research in recent years. Despite this, most of these studies did not investigate the harmful effects resulting from the exposure of such mortars to an environment containing aggressive agents. This work investigated the effects of perlite tailing addition into mortars containing cement CP V-ARI MAX and hydrated lime. The raw materials were subjected to chemical characterization (X-ray fluorescence (XRF)) and mineralogical (X-ray diffraction (XRD)), while the samples immersed in 1 N NaOH solution were characterized by XRD, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and compression strength (CS). The results showed the harmful effects of incorporating perlite tailings into the mortar investigated. Such a degradation was proven by linear expansion and compressive strength experiments accomplished in the samples after the test of resistance to an alkali–silicate reaction.
Roberto Evaristo de Oliveira Neto; Juliana De Melo Cartaxo; Alisson Mendes Rodrigues; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes; Fabiana Pereira da Costa; Sâmea Valensca Alves Barros. Durability Behavior of Mortars Containing Perlite Tailings: Alkali–Silicate Reaction Viewpoint. Sustainability 2021, 13, 9203 .
AMA StyleRoberto Evaristo de Oliveira Neto, Juliana De Melo Cartaxo, Alisson Mendes Rodrigues, Gelmires De Araújo Neves, Romualdo Rodrigues Menezes, Fabiana Pereira da Costa, Sâmea Valensca Alves Barros. Durability Behavior of Mortars Containing Perlite Tailings: Alkali–Silicate Reaction Viewpoint. Sustainability. 2021; 13 (16):9203.
Chicago/Turabian StyleRoberto Evaristo de Oliveira Neto; Juliana De Melo Cartaxo; Alisson Mendes Rodrigues; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes; Fabiana Pereira da Costa; Sâmea Valensca Alves Barros. 2021. "Durability Behavior of Mortars Containing Perlite Tailings: Alkali–Silicate Reaction Viewpoint." Sustainability 13, no. 16: 9203.
A new route based on the combination of saponification/gelation/freeze-casting processes, in which the water was used as the solvent, was proposed to produce highly porous ceramics with isometric pores. The saponification reaction using gelatin promoted an inter-connected and equiaxial pore structure with the absence of lamellar pores, even using water as a solvent. The final porosity was up to ∼95%, and the average pore size ranged from ≈200 up to 500 μm. The amount of saponifying agent had a significant influence on the pore size, while the contents of solids had a more substantial effect on the open porosity. The results indicate that the in situ production of surfactant combined with freeze casting technique allows obtaining ceramics with high porosity and isometric pores even using water as a solvent.
Larrisea Nathiere Rangel De Morais Santos; Juliana De Melo Cartaxo; José Rodrigo Sousa Silva; Alisson Mendes Rodrigues; Eugênia Livia De Andrade Dantas; Frederico Barbosa de Sousa; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes. High porous ceramics with isometric pores by a novel saponification/gelation/freeze-casting combined route. Journal of the European Ceramic Society 2021, 41, 7111 -7118.
AMA StyleLarrisea Nathiere Rangel De Morais Santos, Juliana De Melo Cartaxo, José Rodrigo Sousa Silva, Alisson Mendes Rodrigues, Eugênia Livia De Andrade Dantas, Frederico Barbosa de Sousa, Gelmires De Araújo Neves, Romualdo Rodrigues Menezes. High porous ceramics with isometric pores by a novel saponification/gelation/freeze-casting combined route. Journal of the European Ceramic Society. 2021; 41 (14):7111-7118.
Chicago/Turabian StyleLarrisea Nathiere Rangel De Morais Santos; Juliana De Melo Cartaxo; José Rodrigo Sousa Silva; Alisson Mendes Rodrigues; Eugênia Livia De Andrade Dantas; Frederico Barbosa de Sousa; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes. 2021. "High porous ceramics with isometric pores by a novel saponification/gelation/freeze-casting combined route." Journal of the European Ceramic Society 41, no. 14: 7111-7118.
Natural stones (limestones, granites, and marble) from mines located in northeastern Brazil were investigated to discover their potential for use in civil construction. The natural stones were characterized by chemical analysis, X-ray diffraction, differential thermal analysis, and optical microscopy. The physical-mechanical properties (apparent density, porosity, water absorption, compressive and flexural strength, impact, and abrasion) and chemical resistance properties were also evaluated. The results of the physical-mechanical analysis indicated that the natural stones investigated have the potential to be used in different environments (interior, exterior), taking into account factors such as people’s circulation and exposure to chemical agents.
Fabiana Costa; Jucielle Fernandes; Luiz Melo; Alisson Rodrigues; Romualdo Menezes; Gelmires Neves. The Potential for Natural Stones from Northeastern Brazil to Be Used in Civil Construction. Minerals 2021, 11, 440 .
AMA StyleFabiana Costa, Jucielle Fernandes, Luiz Melo, Alisson Rodrigues, Romualdo Menezes, Gelmires Neves. The Potential for Natural Stones from Northeastern Brazil to Be Used in Civil Construction. Minerals. 2021; 11 (5):440.
Chicago/Turabian StyleFabiana Costa; Jucielle Fernandes; Luiz Melo; Alisson Rodrigues; Romualdo Menezes; Gelmires Neves. 2021. "The Potential for Natural Stones from Northeastern Brazil to Be Used in Civil Construction." Minerals 11, no. 5: 440.
The effect of acid treatment on the adsorptive capacity of a Brazilian palygorskite to remove the crystal violet (CV) and congo red (CR) dyes was investigated. The raw palygorskite was acid-treated by different HCl solutions (2, 4, and 6 mol/L). The modifications on the palygorskite structure were investigated using X-ray diffraction, X-ray fluorescence, Fourier-transform infrared spectroscopy, N2 adsorption/desorption, and thermogravimetric and differential thermal analysis. The efficiency of CV and CR adsorption was investigated, and the effect of the initial concentration, contact time, pH, and adsorbent amount was analyzed. The results revealed that CV adsorption in the acid-treated palygorskite was higher than that of the raw material. A Langmuir isotherm model was observed for the adsorption behavior of CV, while a Freundlich isotherm model was verified for the CR adsorption. A pseudo-second-order model was observed for the adsorption kinetics of both dyes. The higher CV adsorption capacity was observed at basic pH, higher than 97%, and the higher CR removal was observed at acidic pH, higher than 50%. The adsorption parameters of enthalpy (ΔH), entropy (ΔS), and Gibbs energy (ΔG) were evaluated. The adsorption process of the CV and CR dyes on the raw and acid-treated Brazilian palygorskite was predominantly endothermic and occurred spontaneously. The studied raw palygorskite has a mild-adsorption capacity to remove anionic dyes, while acid-treated samples effectively remove cationic dyes.
Vanderlane Silva; Maria Araújo; Alisson Rodrigues; Juliana Cartaxo; Romualdo Menezes; Gelmires Neves. Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water. Sustainability 2021, 13, 3954 .
AMA StyleVanderlane Silva, Maria Araújo, Alisson Rodrigues, Juliana Cartaxo, Romualdo Menezes, Gelmires Neves. Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water. Sustainability. 2021; 13 (7):3954.
Chicago/Turabian StyleVanderlane Silva; Maria Araújo; Alisson Rodrigues; Juliana Cartaxo; Romualdo Menezes; Gelmires Neves. 2021. "Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water." Sustainability 13, no. 7: 3954.
New eco-friendly mass formulations based on the scheelite and kaolin residues were developed to manufacture ceramic tiles. The start raw materials (scheelite residue, kaolin residue, feldspar and plastic clay) were characterized as to their chemical composition, main mineralogical phases, and particle size distribution. Three ceramic masses with 37 wt% of kaolin residues and different contents of the scheelite residues (2 wt%, 5 wt%, and 10 wt%) were formulated. The mass formulations were uniaxially pressed (19.6 MPa) to obtain samples with dimensions of 60 mm × 40 mm x 7 mm, which were dried at 110 °C/24 h, and sintered at different temperatures (1150 °C, 1200 °C, and 1250 °C). Dilatometric experiments measured thermal expansion coefficients. The results are in agreement with the literature, i.e., 6.0 μm/m°C−1, 6.1 μm/m°C−1 and 6.4 μm/m°C−1 to samples with 2 wt%, 5 wt%, and 10 wt% of scheelite residues, respectively. The potential of the mass formulations studied was evaluated by linear shrinkage, water absorption, apparent density, apparent porosity, flexural strength, and mineralogical phase identification. The results were compared with the literature experimental data and International Technical Standards. It was concluded that the samples investigated have suitable properties for use as ceramic and porcelain tiles. Also, the pseudowollastonite and mullite phases were identified in the sample with the lowest concentration of scheelite residue. These phases are responsible for increasing flexural strength.
E.P. Almeida; M.E.A. Carreiro; A.M. Rodrigues; H.S. Ferreira; L.N.L. Santana; R.R. Menezes; G.A. Neves. A new eco-friendly mass formulation based on industrial mining residues for the manufacture of ceramic tiles. Ceramics International 2020, 47, 11340 -11348.
AMA StyleE.P. Almeida, M.E.A. Carreiro, A.M. Rodrigues, H.S. Ferreira, L.N.L. Santana, R.R. Menezes, G.A. Neves. A new eco-friendly mass formulation based on industrial mining residues for the manufacture of ceramic tiles. Ceramics International. 2020; 47 (8):11340-11348.
Chicago/Turabian StyleE.P. Almeida; M.E.A. Carreiro; A.M. Rodrigues; H.S. Ferreira; L.N.L. Santana; R.R. Menezes; G.A. Neves. 2020. "A new eco-friendly mass formulation based on industrial mining residues for the manufacture of ceramic tiles." Ceramics International 47, no. 8: 11340-11348.
The development of technologies to promote residual oil reuse has been encouraged, aiming to reduce the environmental impact and promote sustainability. In this study, a biphasic magnetic catalyst with composition equal to ZnO-Ni0.5Zn0.5Fe2O4 was synthesized and applied to the fatty acid alkyl ester (FAAE) production from residual oil. The ZnO-Ni0.5Zn0.5Fe2O4 catalyst was synthesized by combustion reaction and characterized by X-ray diffraction (XRD), textural analysis, Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetry, particle size distribution, scanning electron microscopy, magnetic measurements, quantification of acidic sites by TPD-NH3, and catalytic tests. The efficiency of catalyst synthesis was evaluated by XRD, FTIR, and Raman spectroscopy experiments. Granulometric analysis and SEM images confirmed the presence of the agglomerates and particles with a wide size range. The catalyst presented soft magnetic behavior, with high saturation magnetization. Additionally, the catalytic activity of the ZnO-Ni0.5Zn0.5Fe2O4 system showed an average conversion of 73% for the methyl route. The results indicate that the reuse of residual oil is feasible for FAAE production, contributing to sustainable fuel development. Moreover, it allows the reintroduction of waste oil into the biodiesel production chain, reducing cost after process optimization.
Adriano Da Silva; Carlos Luna; Ana De Farias; Suelen De Medeiros; Simoni Meneghetti; Alisson Rodrigues; Ana Costa. From Disposal to Reuse: Production of Sustainable Fatty Acid Alkyl Esters Derived from Residual Oil Using a Biphasic Magnetic Catalyst. Sustainability 2020, 12, 10159 .
AMA StyleAdriano Da Silva, Carlos Luna, Ana De Farias, Suelen De Medeiros, Simoni Meneghetti, Alisson Rodrigues, Ana Costa. From Disposal to Reuse: Production of Sustainable Fatty Acid Alkyl Esters Derived from Residual Oil Using a Biphasic Magnetic Catalyst. Sustainability. 2020; 12 (23):10159.
Chicago/Turabian StyleAdriano Da Silva; Carlos Luna; Ana De Farias; Suelen De Medeiros; Simoni Meneghetti; Alisson Rodrigues; Ana Costa. 2020. "From Disposal to Reuse: Production of Sustainable Fatty Acid Alkyl Esters Derived from Residual Oil Using a Biphasic Magnetic Catalyst." Sustainability 12, no. 23: 10159.
New ceramic formulations based on scheelite tailing were developed, and their potential in the ceramic industry was evaluated. Green bodies with different contents of scheelite tailing (0–8 wt%) were sintered (1150 °C, 1200 °C, and 1250 °C) and characterized in terms of the main mineralogical phases, microstructure, and physico-mechanical properties. The mullite was the main phase identified in all sintered temperatures. This result was also ratified with the aid of scanning electron microscope (SEM) images, in which small needles of the mullite were detected. The presence of mullite is required because it contributes to increasing the mechanical resistance of the material. The physico-mechanical properties measured (water absorption, linear shrinkage, apparent porosity, and flexural strength) were compared to the ISO 13006, and the samples sintered at 1150 °C presented potential to be used as semi-stoneware, while those sintered at 1200 °C and 1250 °C can be employed stoneware and porcelain tiles, respectively.
Julliana Marques R. De Figueirêdo; Fabiana Pereira Da Costa; Jucielle Veras Fernandes; Alisson Mendes Rodrigues; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes; Lisiane Navarro De Lima Santana. Development of Scheelite Tailings-Based Ceramic Formulations with the Potential to Manufacture Porcelain Tiles, Semi-Stoneware and Stoneware. Materials 2020, 13, 5122 .
AMA StyleJulliana Marques R. De Figueirêdo, Fabiana Pereira Da Costa, Jucielle Veras Fernandes, Alisson Mendes Rodrigues, Gelmires De Araújo Neves, Romualdo Rodrigues Menezes, Lisiane Navarro De Lima Santana. Development of Scheelite Tailings-Based Ceramic Formulations with the Potential to Manufacture Porcelain Tiles, Semi-Stoneware and Stoneware. Materials. 2020; 13 (22):5122.
Chicago/Turabian StyleJulliana Marques R. De Figueirêdo; Fabiana Pereira Da Costa; Jucielle Veras Fernandes; Alisson Mendes Rodrigues; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes; Lisiane Navarro De Lima Santana. 2020. "Development of Scheelite Tailings-Based Ceramic Formulations with the Potential to Manufacture Porcelain Tiles, Semi-Stoneware and Stoneware." Materials 13, no. 22: 5122.
In this study, we develop ceramic formulations based on quartzite and scheelite tailings collected from mining companies in the northeast of Brazil (Rio Grande do Norte State). New ceramic samples (27 wt% of kaolin, 29 wt% of plastic clay, 11 wt% of quartzite tailing, and 0–8 wt% scheelite tailing) were uniaxially pressed in two steps (20 MPa and 50 Mpa for 20 s); dried at 110 °C for 24 h; and sintered at 1150 °C, 1200 °C, and 1250 °C. The main mineralogical phases (mullite, quartz, calcite, and anorthite) of the sintered samples were identified using X-ray diffraction (XRD). After evaluation of the physical-mechanical properties (water absorption, linear shrinkage, apparent porosity, and flexural strength), it was observed that the incorporation of scheelite tailing by up to 8 wt% did not significantly alter the properties of samples sintered at all temperatures. Our results indicate that the new ceramics formulations developed have strong potentials in manufacturing sustainable materials such as ceramic tiles and porcelain stoneware.
Jucielle Fernandes; Danyelle Guedes; Fabiana Da Costa; Alisson Rodrigues; Gelmires Neves; Romualdo Menezes; Lisiane Santana. Sustainable Ceramic Materials Manufactured from Ceramic Formulations Containing Quartzite and Scheelite Tailings. Sustainability 2020, 12, 9417 .
AMA StyleJucielle Fernandes, Danyelle Guedes, Fabiana Da Costa, Alisson Rodrigues, Gelmires Neves, Romualdo Menezes, Lisiane Santana. Sustainable Ceramic Materials Manufactured from Ceramic Formulations Containing Quartzite and Scheelite Tailings. Sustainability. 2020; 12 (22):9417.
Chicago/Turabian StyleJucielle Fernandes; Danyelle Guedes; Fabiana Da Costa; Alisson Rodrigues; Gelmires Neves; Romualdo Menezes; Lisiane Santana. 2020. "Sustainable Ceramic Materials Manufactured from Ceramic Formulations Containing Quartzite and Scheelite Tailings." Sustainability 12, no. 22: 9417.
Multilayer-like CrN and Cr1−xAlxN coatings with different Al contents were deposited onto a stainless steel substrate using dynamic glancing angle deposition direct current magnetron sputtering (DGLAD dcMS) in a N rich atmosphere to understand the role of Al on the growth of the films and mechanical properties of the nitrides with a multilayer architecture. Chemical analysis by means of energy dispersive analysis (EDS) and glow discharge optical emission spectroscopy (GDOES) depth profiling revealed that while CrN samples were close to stoichiometric, the Cr1−xAlxN coatings presented excess N between 70 and 80% at. An expressive change in texture was observed as the CrN coating changed its preferred orientation from (111) to (200) with the addition of Al, followed by a modification in morphology from grains with faceted pyramidal tops in CrN to dome-shaped grains in Cr1−xAlxN coatings. Multilayer-like nanostructures of corrugated grains were produced with a periodicity of approximately 30 nm using dynamic glancing angle deposition. The deposition rate was drastically reduced with an increase of Al, meanwhile, the best mechanical performance was achieved for the coating with a higher content of Al, with hardness up to 27 GPa and a higher value of maximum resistance to plastic deformation.
Pedro Renato Tavares Avila; Alisson Mendes Rodrigues; Monica Costa Rodrigues Guimarães; Magdalena Walczak; Romualdo R. Menezes; Gelmires A. Neves; Haroldo Cavalcanti Pinto. Nitrogen-Enriched Cr1−xAlxN Multilayer-Like Coatings Manufactured by Dynamic Glancing Angle Direct Current Magnetron Sputtering. Materials 2020, 13, 3650 .
AMA StylePedro Renato Tavares Avila, Alisson Mendes Rodrigues, Monica Costa Rodrigues Guimarães, Magdalena Walczak, Romualdo R. Menezes, Gelmires A. Neves, Haroldo Cavalcanti Pinto. Nitrogen-Enriched Cr1−xAlxN Multilayer-Like Coatings Manufactured by Dynamic Glancing Angle Direct Current Magnetron Sputtering. Materials. 2020; 13 (16):3650.
Chicago/Turabian StylePedro Renato Tavares Avila; Alisson Mendes Rodrigues; Monica Costa Rodrigues Guimarães; Magdalena Walczak; Romualdo R. Menezes; Gelmires A. Neves; Haroldo Cavalcanti Pinto. 2020. "Nitrogen-Enriched Cr1−xAlxN Multilayer-Like Coatings Manufactured by Dynamic Glancing Angle Direct Current Magnetron Sputtering." Materials 13, no. 16: 3650.
The efficiency of acid treatment on natural calcium bentonite (natural bentonite) for anionic dye adsorption was investigated using methyl orange (MO) as a probe. Additionally, adsorption experiments were accomplished between the natural bentonite, acidified bentonite, and a cationic dye (methylene blue, MB). Acid functionalization in natural bentonite (RF) was carried out with HCl and H2SO4 acids (RF1 and RF2, respectively). The samples were characterized by chemical analysis, mineralogy, particle size, and thermal behavior with the associated mass losses. The adsorption efficiency of MO and MB dyes was investigated by the effects of the initial concentration of adsorbate (Ci) and the contact time (tc). The acid treatment was efficient for increasing the adsorption capacity of the anionic dye, and the Qmaxexp values measured were 2.2 mg/g, 67.4 mg/g e 47.8 mg/g to RF, RF1 e RF2, respectively. On the other hand, the acid functionalization of bentonite did not significantly modify the MB dye adsorption. The Sips equation was the best fit for the adsorption isotherms. Thus, we found that the acid-functionalized bentonite increases the anionic dye adsorption by up to 8000%. The increased adsorptive capacity of acidified bentonite was explained in terms of electrostatic attraction between the clay surface and the dye molecule.
Jucielle Veras Fernandes; Alisson Mendes Rodrigues; Romualdo Rodrigues Menezes; Gelmires De Araújo Neves. Adsorption of Anionic Dye on the Acid-Functionalized Bentonite. Materials 2020, 13, 3600 .
AMA StyleJucielle Veras Fernandes, Alisson Mendes Rodrigues, Romualdo Rodrigues Menezes, Gelmires De Araújo Neves. Adsorption of Anionic Dye on the Acid-Functionalized Bentonite. Materials. 2020; 13 (16):3600.
Chicago/Turabian StyleJucielle Veras Fernandes; Alisson Mendes Rodrigues; Romualdo Rodrigues Menezes; Gelmires De Araújo Neves. 2020. "Adsorption of Anionic Dye on the Acid-Functionalized Bentonite." Materials 13, no. 16: 3600.
Glass-ceramics foams (GCs foams) were manufactured with the aid of the replica method and from cheap and sustainable raw materials (waste glass bottle, bentonite, and alumina). In order to evaluate the Al2O3 effect on the microstructure and physico-chemical properties of the GCs foams, the precursor aqueous solutions were prepared with different contents of the waste glass bottles (30 wt% and 35 wt%), alumina (0 wt%, 2 wt%, 5 wt%, and 8 wt%), and sintered at temperatures 750 °C and 800 °C. The amorphous/crystalline nature of the GCs foams was investigated by XRD, and the calcium sodium silicate (Na2Ca3Si6O16), cristobalite, and corundum were the main crystalline phases identified. In general, the addition of alumina increased porosity and water absorption with a consequent reduction in flexural strength. The manufactured glass-ceramic foams showed average pore sizes in the range of 240–360 μm, porosity between 52% and 85%, and flexural strength between 0.2 MPa and 3.7 MPa.
Fabiana Pereira da Costa; Crislene Rodrigues Da Silva Morais; Haroldo Cavalcanti Pinto; Alisson Mendes Rodrigues. Microstructure and physico-mechanical properties of Al2O3-doped sustainable glass-ceramic foams. Materials Chemistry and Physics 2020, 256, 123612 .
AMA StyleFabiana Pereira da Costa, Crislene Rodrigues Da Silva Morais, Haroldo Cavalcanti Pinto, Alisson Mendes Rodrigues. Microstructure and physico-mechanical properties of Al2O3-doped sustainable glass-ceramic foams. Materials Chemistry and Physics. 2020; 256 ():123612.
Chicago/Turabian StyleFabiana Pereira da Costa; Crislene Rodrigues Da Silva Morais; Haroldo Cavalcanti Pinto; Alisson Mendes Rodrigues. 2020. "Microstructure and physico-mechanical properties of Al2O3-doped sustainable glass-ceramic foams." Materials Chemistry and Physics 256, no. : 123612.
A stable moisturizing cosmetic emulsion was developed from babassu nut oil and high concentrations of sunscreens.
Michael Jackson Ferreira DA Silva; Alisson Mendes Rodrigues; Italo Rennan Sousa Vieira; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes; Eloisa Da Graça Do Rosário Gonçalves; Maria Célia Costa Pires. Development and characterization of a babassu nut oil-based moisturizing cosmetic emulsion with a high sun protection factor. RSC Advances 2020, 10, 26268 -26276.
AMA StyleMichael Jackson Ferreira DA Silva, Alisson Mendes Rodrigues, Italo Rennan Sousa Vieira, Gelmires De Araújo Neves, Romualdo Rodrigues Menezes, Eloisa Da Graça Do Rosário Gonçalves, Maria Célia Costa Pires. Development and characterization of a babassu nut oil-based moisturizing cosmetic emulsion with a high sun protection factor. RSC Advances. 2020; 10 (44):26268-26276.
Chicago/Turabian StyleMichael Jackson Ferreira DA Silva; Alisson Mendes Rodrigues; Italo Rennan Sousa Vieira; Gelmires De Araújo Neves; Romualdo Rodrigues Menezes; Eloisa Da Graça Do Rosário Gonçalves; Maria Célia Costa Pires. 2020. "Development and characterization of a babassu nut oil-based moisturizing cosmetic emulsion with a high sun protection factor." RSC Advances 10, no. 44: 26268-26276.
Aiming to decrease friction coefficient ( μ ) during the forming of magnesium alloy sheets, nine (9) tools with different hole geometries in their surface (flat, elliptical, and circular) were manufactured from steel Boehler W400 VMR (as known as DIN 1.2343). Tribological investigations were accomplished on a strip drawing machine at 288 °C without lubricants. When compared with a standard tool (surface flat), on average, tools with circular geometries in their surface showed the smallest friction coefficient, while tools with elliptical geometries shown higher. The friction coefficient also was confronted with the ratio between area occupied by holes in the surface of the tool and the total tool surface (i.e., factor f (%)), hole diameter (Ø), and the distance between circle centers (d(c,c)). Principal Component Analysis (PCA) complemented the experimental approach. In summary, both approaches (experimental and theoretical) indicated that the manufactured tool with circular geometries on its surface presented lower friction coefficient values on the forming processes of the magnesium AZ31 sheets.
Bruno Caetano Dos Santos Silva; Alisson Mendes Rodrigues; Roland Mueller; Fábio André Lora; Marcio Luis Ferreira Nascimento; Haroldo Cavalcanti Pinto; Rodrigo Santiago Coelho. Tribological Investigations on Tool Surfaces for Temperature-Supported Forming of Magnesium AZ31 Sheets. Materials 2020, 13, 2465 .
AMA StyleBruno Caetano Dos Santos Silva, Alisson Mendes Rodrigues, Roland Mueller, Fábio André Lora, Marcio Luis Ferreira Nascimento, Haroldo Cavalcanti Pinto, Rodrigo Santiago Coelho. Tribological Investigations on Tool Surfaces for Temperature-Supported Forming of Magnesium AZ31 Sheets. Materials. 2020; 13 (11):2465.
Chicago/Turabian StyleBruno Caetano Dos Santos Silva; Alisson Mendes Rodrigues; Roland Mueller; Fábio André Lora; Marcio Luis Ferreira Nascimento; Haroldo Cavalcanti Pinto; Rodrigo Santiago Coelho. 2020. "Tribological Investigations on Tool Surfaces for Temperature-Supported Forming of Magnesium AZ31 Sheets." Materials 13, no. 11: 2465.
Glass-ceramic foams were manufactured with waste glass bottle (85.7 wt%, 87.5 wt%, and 88.9 wt%) and bentonite. The raw materials were characterized by Energy-dispersive X-ray spectroscopy (EDX) and thermal gravimetric analysis (TGA). The thermal treatment to obtain the glass-ceramic foams were conducted to eliminate the polyurethane without damaging their structure. The glass-ceramic foams sintering was performed at 750 °C, 800 °C, and 850 °C. The macro and microanalysis (optical microscopy) showed a significant porosity reduction, in the samples with higher waste glass contents. Pore closure also was found in samples sintered at 850 °C. In both cases, the pore closure resulted from melting of the glass-ceramic foam. The X-ray diffraction results show that the calcium sodium silicate (Na2Ca3Si6O16) was the main crystalline phase. The physico-mechanical properties (linear shrinkage-LS, loss of mass on fire-LMF, water absorption-WA, apparent porosity-AP, bulk density-BD, and flexural strength-σf) were evaluated for glass-ceramics foams containing 85.7 wt% and 87.5 wt% of waste glass, sintered at 750 °C and 800 °C. The glass-ceramic foams sintered at 750 °C showed an average pore size of 275 μm and 330 μm, porosity of 65.1% and 39.8% and flexural strength of 0.32 MPa and 1.42 MPa for samples containing 85.7 wt% and 87.5 wt% waste glass, respectively. Already sintered foams at 800 °C, the average pore size was 283 μm and 239 μm, the porosity of 37.7% and 18.8% and the flexural strength of 1.90 MPa and 3.77 MPa for samples containing 85.7 wt% and 87.5 wt% waste glass, respectively. In general, the LMF, PA and WA values decrease with the increasing temperature, while the BD, LS, and σf values increase with temperature.
Fabiana Pereira da Costa; Crislene Rodrigues Da Silva Morais; Alisson Mendes Rodrigues. Sustainable glass-ceramic foams manufactured from waste glass bottles and bentonite. Ceramics International 2020, 46, 17957 -17961.
AMA StyleFabiana Pereira da Costa, Crislene Rodrigues Da Silva Morais, Alisson Mendes Rodrigues. Sustainable glass-ceramic foams manufactured from waste glass bottles and bentonite. Ceramics International. 2020; 46 (11):17957-17961.
Chicago/Turabian StyleFabiana Pereira da Costa; Crislene Rodrigues Da Silva Morais; Alisson Mendes Rodrigues. 2020. "Sustainable glass-ceramic foams manufactured from waste glass bottles and bentonite." Ceramics International 46, no. 11: 17957-17961.
Glass-ceramics (GCs) are inorganic, non-metallic materials prepared by controlled crystallization of glasses, which contain at least one functional crystalline phase and a residual glass. In this work, to find the best compromise between coefficient of thermal expansion (CTE) and high sinterability on the LAS GCs, we accomplish changes in the minority oxides (MgO, ZnO, B2O3, P2O5, K2O, and SnO2) of a LAS glass composition (Li2O–Al2O3–SiO2). All LAS GCs were sintered non-isothermally. We propose the use of glass stability parameters (KA, KH, and KM) to point out the most promising glass composition concerning sintering. Indeed, the glass compositions which presented a low tendency to crystallization during the heating, resulted in GCs with the lowest porosities. The porosity analysis was performed through image analysis of optical micrographs. The compositional changes in the most sinterable glasses consisted of MgO reduction (from 1.64 to 0.85 mol%), increases in B2O3 (from 1.4 to 1.9 mol%), and keeping the sum of ZnO and K2O between 1.7 to 1.8 mol%. The changes in minority oxides of the parent glass composition significantly modified the CTE values of the LAS GCs, mainly due to changes in GC crystallinity. The changes in the glass composition allowed to obtain a highly dense sintered GC (0.4 ± 0.1% in porosity), having an appropriated CTE (0.34 × 10−6 K-1) to applications as induction cooktop plates.
Viviane Oliveira Soares; Alisson Mendes Rodrigues. Improvements on sintering and thermal expansion of lithium aluminum silicate glass-ceramics. Ceramics International 2020, 46, 17430 -17436.
AMA StyleViviane Oliveira Soares, Alisson Mendes Rodrigues. Improvements on sintering and thermal expansion of lithium aluminum silicate glass-ceramics. Ceramics International. 2020; 46 (11):17430-17436.
Chicago/Turabian StyleViviane Oliveira Soares; Alisson Mendes Rodrigues. 2020. "Improvements on sintering and thermal expansion of lithium aluminum silicate glass-ceramics." Ceramics International 46, no. 11: 17430-17436.
Nanocalorimetry is an ideal candidate for revealing the crystallization of metallic glass in a wide temperature range attributing to its ultrafast heating rate and ultrahigh sensitivity. In this study, in situ preparation of Ce68Al10Cu20Co2 (at.%) metallic glass was realized by the nanocalorimetry. By the subsequent reheating at the rates from 500 to 40,000 K/s, the crystallization in a wide temperature range was demonstrated. The crystallization activation energy and Avrami exponent are calculated with the aid of the Kissinger and Johnson-Mehl-Avrami (JMA) equations to reveal the temperature-dependent nucleation and crystal growth behavior in the undercooled liquid, where three crystallization regimes are identified. At low temperature, the crystallization occurs with constant activation energy. In an intermediate temperature range, the crystallization is controlled by crystal growth with a reduction of activation energy. At temperatures approaching Tm, an increased activation energy resulting from the thermodynamic driving force dominates the nucleation-controlled crystallization. This study provides a novel strategy to reveal the crystallization behavior in the undercooled liquid from Tg to Tm and to demonstrate the transition from growth-controlled crystallization to nucleation-controlled one with the decrease of undercooling.
Bingge Zhao; Alisson M. Rodrigues; Kai Ding; Hailan Ma; Guanzhi Wu; Qijie Zhai; Yulai Gao. Approaching the melting temperature: There regimes in the non-isothermal crystallization of Ce68Al10Cu20Co2 bulk metallic glass revealed by nanocalorimetry. Intermetallics 2019, 116, 106653 .
AMA StyleBingge Zhao, Alisson M. Rodrigues, Kai Ding, Hailan Ma, Guanzhi Wu, Qijie Zhai, Yulai Gao. Approaching the melting temperature: There regimes in the non-isothermal crystallization of Ce68Al10Cu20Co2 bulk metallic glass revealed by nanocalorimetry. Intermetallics. 2019; 116 ():106653.
Chicago/Turabian StyleBingge Zhao; Alisson M. Rodrigues; Kai Ding; Hailan Ma; Guanzhi Wu; Qijie Zhai; Yulai Gao. 2019. "Approaching the melting temperature: There regimes in the non-isothermal crystallization of Ce68Al10Cu20Co2 bulk metallic glass revealed by nanocalorimetry." Intermetallics 116, no. : 106653.
Due to their applicability for manufacturing dense, hard and stable coatings, Physical Vapor Deposition (PVD) techniques, such as High Power Impulse Magnetron Sputtering (HiPIMS), are currently used to deposit transition metal nitrides for tribological applications. Cr-Al-N is one of the most promising ceramic coating systems owing to its remarkable mechanical and tribological properties along with excellent corrosion resistance and high-temperature stability. This work explores the possibility of further improving Cr-Al-N coatings by modulation of its microstructure. Multilayer-like Cr1−xAlxN single films were manufactured using the angular oscillation of the substrate surface during HiPIMS. The sputtering process was accomplished using pulse frequencies ranging from 200 to 500 Hz and the resulting films were evaluated with respect to their hardness, Young’s modulus, residual stresses, deposition rate, crystallite size, crystallographic texture, coating morphology, chemical composition, and surface roughness. The multilayer-like structure, with periodicities ranging from 250 to 550 nm, were found associated with misorientation gradients and small-angle grain boundaries along the columnar grains, rather than mesoscopic chemical modulation of the microstructure. This minute modification of microstructure along with associated compressive residual stresses are concluded to explain the increased hardness ranging from 25 to 30 GPa, which is at least 20% over that expected for a film of the same chemical composition grown by a conventional PVD processing route.
Pedro Renato Tavares Avila; Erenilton Pereira da Silva; Alisson Mendes Rodrigues; Katherine Aristizabal; Fabiola Pineda; Rodrigo Santiago Coelho; Jose Luís Garcia; Flavio Soldera; Magdalena Walczak; Haroldo Cavalcanti Pinto. On manufacturing multilayer-like nanostructures using misorientation gradients in PVD films. Scientific Reports 2019, 9, 15898 .
AMA StylePedro Renato Tavares Avila, Erenilton Pereira da Silva, Alisson Mendes Rodrigues, Katherine Aristizabal, Fabiola Pineda, Rodrigo Santiago Coelho, Jose Luís Garcia, Flavio Soldera, Magdalena Walczak, Haroldo Cavalcanti Pinto. On manufacturing multilayer-like nanostructures using misorientation gradients in PVD films. Scientific Reports. 2019; 9 (1):15898.
Chicago/Turabian StylePedro Renato Tavares Avila; Erenilton Pereira da Silva; Alisson Mendes Rodrigues; Katherine Aristizabal; Fabiola Pineda; Rodrigo Santiago Coelho; Jose Luís Garcia; Flavio Soldera; Magdalena Walczak; Haroldo Cavalcanti Pinto. 2019. "On manufacturing multilayer-like nanostructures using misorientation gradients in PVD films." Scientific Reports 9, no. 1: 15898.
D.C. Silva; David Sampaio; J.H.L. Silva; Alisson Mendes Rodrigues; R.B. Pena; B.J.A. Moulton; P.S. Pizani; J.P. Rino; R.S. Silva. Synthesis of PbO·SiO2 glass by CO2 laser melting method. Journal of Non-Crystalline Solids 2019, 522, 1 .
AMA StyleD.C. Silva, David Sampaio, J.H.L. Silva, Alisson Mendes Rodrigues, R.B. Pena, B.J.A. Moulton, P.S. Pizani, J.P. Rino, R.S. Silva. Synthesis of PbO·SiO2 glass by CO2 laser melting method. Journal of Non-Crystalline Solids. 2019; 522 ():1.
Chicago/Turabian StyleD.C. Silva; David Sampaio; J.H.L. Silva; Alisson Mendes Rodrigues; R.B. Pena; B.J.A. Moulton; P.S. Pizani; J.P. Rino; R.S. Silva. 2019. "Synthesis of PbO·SiO2 glass by CO2 laser melting method." Journal of Non-Crystalline Solids 522, no. : 1.