RSS 1.0Artigos - Materiais e Tecnologia - FEG
Browse by
Recent Submissions
-
Thermal characterization and lifetime prediction of the PHBV/nanocellulose biocomposites using different kinetic approaches
Carvalho Benini, Kelly Cristina Coelho de
; Ornaghi, Heitor Luiz ; de Medeiros, Nicole Morabito ; Pereira, Paulo Henrique Fernandes ; Cioffi, Maria Odila Hilário (Cellulose, 2020) [Artigo]
In the present study, biocomposite films from cellulose nanocrystals (CNCs) were obtained by the solution casting method. CNCs were isolated from pineapple crown using chemical treatments followed by sulfuric acid hydrolysis ... -
Furfuryl resin/CNT/carbon fiber drilling, using carbide drill coated with Balinit-Helica
David-Müzel, Sarah; Bonhin, Eduardo Pires ; Ribeiro, Marcos Valério ; Botelho, Edson Cocchieri ; Alves, Manoel Cléber de Sampaio (Materials and Manufacturing Processes, 2020) [Artigo]
Bolted joints are the most common form of union of the components in an airplane, with drilling being the most used process in obtaining the holes. However, this process can cause several defects, so the parts produced can ... -
Novel Approaches of Nanoceria with Magnetic, Photoluminescent, and Gas-Sensing Properties
; Amoresi, Rafael A.C.; Moreno, Henrique ; Ramirez, Miguel A. ; ; Foschini, Cesar R. ; ; Simões, Alexandre Z. (ACS Omega, 2020) [Artigo]
The modification of CeO2 with rare-earth elements opens up a wide range of applications as biomedical devices using infrared emission as well as magnetic and gas-sensing devices, once the structural, morphological, ... -
Metallic behavior in STO/LAO heterostructures with non-uniformly atomic interfaces
Amoresi, Rafael A.C.; ; ; ; ; ; ; Simões, Alexandre Z. ; ; et al. (Materials Today Communications, 2020) [Artigo]
The search for new and low-power switching devices involving the integration of semiconductor thin films is of interest, and has led to renewed research because such devices may exhibit innovative properties. Here, we ... -
Creep behavior of polyetherimide semipreg and epoxy prepreg composites: Structure vs. property relationship
Reis, Ana Karoline dos; Monticelli, Francisco Maciel ; ; de Paula Santos, Luis Felipe ; Botelho, Edson Cocchieri ; Luiz Ornaghi Jr, Heitor (Journal of Composite Materials, 2020) [Artigo]
In the present study, the creep behavior of polyetherimide semipreg and epoxy prepreg composites was studied using dynamic mechanical analyzer and focused on structure vs. property relationships in glassy, glass transition, ... -
Obtaining cellulose nanocrystals from pineapple crown fibers by free-chlorite hydrolysis with sulfuric acid: physical, chemical and structural characterization
Pereira, Paulo Henrique Fernandes; Ornaghi Júnior, Heitor Luiz ; Coutinho, Luana Venâncio ; ; Cioffi, Maria Odila Hilário (Cellulose, 2020) [Artigo]
Brazil is the second-largest world producer of pineapple and generates almost 45% of its initial mass in wastes after industrialization, mainly due to the inappropriate deposition of peel and crown, which contribute to ... -
Nonvolatile memories
Rocha, Leandro S.R.; Simões, Alexandre Z. ; Cortés, Johan A. ; Ramirez, Miguel A. ; ; Foschini, Cesar R. ; ; Cilense, Mario ; ; Paiva-Santos, Carlos O. (Magnetic, Ferroelectric, and Multiferroic Metal Oxides, 2018) [Capítulo de livro]
The need for faster, smaller, cheaper and energy-efficient electronic devices has been growing continuously in the last decade, with the conventional data storage technologies (i.e., static random access memory and dynamic ... -
Charge transfer in Pr-Doped cerium oxide: Experimental and theoretical investigations
Cristina de Oliveira, Regiane; ; ; ; ; Sambrano, Julio Ricardo ; Simões, Alexandre Zirpoli ; ; ; et al. (Materials Chemistry and Physics, 2020) [Artigo]
In this study was synthesized cerium oxide (CeO2) doped with praseodymium (Pr) using a microwave-assisted hydrothermal method. The positions of the vacancies with respect to Ce3+/Ce4+ and the vacancy-like defects surrounded ... -
AISI 4140 Steel Fatigue Performance: Cd Replacement by Electroplated Zn-Ni Alloy Coating
Ferreira Fernandes, Martin; dos Santos, Jefferson Rodrigo Marcelino ; de Oliveira Velloso, Verônica Mara ; Voorwald, Herman Jacobus Cornelis (Journal of Materials Engineering and Performance, 2020) [Artigo]
The fatigue behavior of electrodeposited Zn-Ni alloy coating was investigated for its suitability to replace Cd coatings in AISI 4140 steel studs applied in oil and gas industries due to environmental and human health ... -
Low-temperature impedance spectroscopic analyses of ceramic electrodes based on Mo and Co co-doped SnO2
; ; ; ; ; ; ; Simões, Alexandre Z.; (Processing and Application of Ceramics, 2019) [Artigo]
Low resistive electrodes based on Co and Mo co-doped SnO2 were prepared by the conventional solid-state reaction and sintered at 1250 °C for 2 h. Concentration of Co2O3 precursor was unchanged (1 mol%), while MoO3 was ... -
Porosity Characterization of Carbon Fiber/Epoxy Composite Using Hg Porosimetry and Other Techniques
Monticeli, Francisco Maciel; ; Voorwald, Herman Jacobus Cornelis ; Cioffi, Maria Odila Hilário (Polymer Engineering and Science, 2020) [Artigo]
In polymer composites, the porosity acts mainly as a stress concentrator, which has detrimental effects depending on the shape and position of the voids. Also, the presence of voids is detrimental to the mechanical properties, ... -
Carbon foam composites based on expanded graphite for electrochemical application
; ; Botelho, Edson Cocchieri; (Diamond and Related Materials, 2020) [Artigo]
Polymer composites containing modified graphite structures as fillers have been successfully processed exhibiting attractive features for different applications. Carbon foams derived from polymer precursor is brittle and ... -
Experimental and theoretical interpretation of the order/disorder clusters in CeO2:La
; Aparecido Ciola Amoresi, Rafael; Duarte, Thiago Marinho ; Marana, Naiara Letícia ; Sambrano, Julio Ricardo ; ; Simões, Alexandre Zirpoli ; ; (Applied Surface Science, 2020) [Artigo]
A spectroscopic study of nanostructured lanthanum-doped cerium oxide samples showed that a mild decrease by 5.3% in the surface concentration of Ce(III) species and, a reduction by 0.2 eV in the so-called energy-gap (EF – ... -
Multifunctional Characteristics of Glass Fiber-Reinforced Epoxy Polymer Composites with Multiwalled Carbon Nanotube Buckypaper Interlayer
; ; Costa, Michelle Leali; Botelho, Edson Cocchieri ; (Polymer Engineering and Science, 2020) [Artigo]
In this work, multiwalled carbon nanotube buckypaper (MWCNT-BP) was inserted at the middle-plane of glass fiber/epoxy resin prepregs to obtain three-phase nanostructured composite. Preliminary tests conducted by differential ... -
Survey on chemical, physical, and thermal prediction behaviors for sequential chemical treatments used to obtain cellulose from Imperata Brasiliensis
de Carvalho Benini, Kelly Cristina Coelho; Ornaghi, Heitor L. ; Pereira, Paulo Henrique Fernandes ; ; Voorwald, Herman Jacobus Cornelis ; Cioffi, Maria Odila Hilário (Journal of Thermal Analysis and Calorimetry, 2020) [Artigo]
The effects of chemical treatment sequences on the chemical, physical, and mainly the thermal properties of Imperata Brasiliensis grass in the process used to obtain cellulose fibers were analyzed. The thermal properties ... -
Experimental and ab Initio Studies of Deep-Bulk Traps in Doped Rare-Earth Oxide Thick Films
; ; ; ; Simoes, Alexandre Z.; ; ; ; (Journal of Physical Chemistry C, 2019) [Artigo]
Lanthanum-doped CeO2 is a promising semiconductor for gas sensing. A combined study applying impedance spectroscopy and first-principles calculations was performed for pure and lanthanum-doped samples. The results showed ... -
CeO2 Nanoparticle Morphologies and Their Corresponding Crystalline Planes for the Photocatalytic Degradation of Organic Pollutants
Amoresi, Rafael A. C.; Oliveira, Regiane C. ; Marana, Naiara L. ; ; ; Zaghete, Maria A. ; ; Sambrano, Julio R. ; Simões, Alexandre Z. (ACS Applied Nano Materials, 2019) [Artigo]
Currently, numerous properties of semiconducting oxides are correlated to their morphological characteristics resulting from their exposed surfaces. In the present work, the relationship between the following morphologies ... -
Evidence of ferroelectric behaviour in CaCu3Ti4O12 thin films deposited by RF-sputtering
Foschini, Cesar R.; Hangai, Bruno ; Ortega, Pedro Paulo ; Longo, Elson ; Cilense, Mário ; Simões, Alexandre Z. (Processing and Application of Ceramics, 2019) [Artigo]
The origin of abnormal ferroelectric and unusual piezoelectricity in the polycrystalline CaCu3Ti4O12 (CCTO) thin films deposited by RF-sputtering on Pt/Ti/SiO2/Si (100) substrates was explored. The CCTO thin films, deposited ... -
The synergy effect of carbon/glass/epoxy hybrid laminate in Mode I delamination: A physical microfracture analysis
Maciel Monticeli, Francisco; Yutaka Shiino, Marcos ; Jacobus Cornelis Voorwald, Herman ; Hilário Cioffi, Maria Odila (Engineering Fracture Mechanics, 2020) [Artigo]
The adoption of carbon/glass fiber hybrid composites is an economical alternative to high-cost carbon/epoxy composites and helps to address environmental issues. However, the addition of another type of fiber modifies the ... -
Polyurethane Foam Reinforced with Fibers Pineaplle Crown Biocomposites for Sorption of Vegetable Oil
; Monticeli, Francisco Maciel; (Fibers and Polymers, 2020) [Artigo]
The concern in reducing the environmental impacts caused by human interference is increasing. Thus, the objective of this study was to generate a sustainable solution for sorption of vegetable oil. It was developed and ...