Showing papers by "Federal University of São Carlos published in 2022"
TL;DR: In this article , a simple method to produce an efficient conductive filament, containing graphite within the polymer matrix of PLA, and applied in conjunction with 3D printing technology to generate (bio)sensors without the need for surface activation was reported.
36 citations
TL;DR: In this article , the authors discuss various strategies explored to fabricate low-cost electrochemical sensors, including its main applications, emphasizing the performance of the obtained devices, in addition to their advantages and disadvantages.
31 citations
TL;DR: In this article, the effect of the polymorphic ZrO2 phase composed of Cu0/+-ZnO sites at the atomic level and its impact on the reaction mechanism was evaluated.
25 citations
TL;DR: In this paper, a systematic literature review and bibliometric analysis was conducted, resulting in 80 articles that composed the final analysis, identifying five recurring topics in the articles, the most important of the CIM, and discussed them in depth.
21 citations
TL;DR: In this paper, the relationship between spinodal decomposition and the formation of Ni-rich clusters and G-phase in the ferrite on hardening and pitting corrosion of two thermally aged duplex stainless steels (DSSs) at 475°C was investigated.
21 citations
TL;DR: In this article, the polyglycerol activated carbon (PGAC) electrode was employed as an electrode for CDI desalination of brackish water, which achieved stable SAC (∼27.1 µg−1) and charge efficiency (QE) over 50 cycles.
20 citations
TL;DR: In this article, the effects of tree species identity and mycorrhizal association on soil fauna taxonomic and functional community composition were evaluated by performing a field study across six common gardens in Denmark.
20 citations
01 Jan 2022
TL;DR: In this article, a facile technique for preparing polyaniline (PANI and PANI/G) nanocomposite thin films and their application as enzyme-free electrochemical sensors for hydrogen peroxide (H2O2) detection was reported.
Abstract: The electrochemical method is the most effective, facile, and economical approach for the detection of small molecules. The present article deals with the design and engineering of polymer–graphene-based thin films through an in situ facile synthesis technique for the development of high performance electrochemical sensors. We report a facile technique for preparing polyaniline (PANI) and polyaniline/graphene (PANI/G) nanocomposite thin films and their application as enzyme-free electrochemical sensors for hydrogen peroxide (H2O2). PANI and PANI/G films were deposited on a dopamine modified ITO substrate via spin coating and in situ deposition techniques. The in situ fabricated films, which exhibited better electrical properties and stability as compared to the spin coated films, were studied in detail. These thin films were characterized using UV-visible spectroscopy, FT-IR spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM) to study their optical, chemical, and surface textural properties. Results show a homogeneous distribution of the constituting materials. From the AFM results, it was found out that the PANI/G film showed increased surface roughness (∼20 nm) as compared to the PANI film (∼15 nm). The electrochemical properties of the films were determined using the van der Pauw method and cyclic voltammetry technique. The conductivity of the PANI and PANI/G films was estimated to be 5.38 × 103 and 6.84 × 103 S cm−1, respectively. Finally, the electrochemical sensing performances of the PANI and PANI/G films were investigated towards H2O2 reduction in a wide potential range of −0.6 to 0.6 V in 0.1 M PBS solution of pH 7.0. This work demonstrates the application of thin-film technology for the development of nanodevice sensors.
19 citations
TL;DR: In this paper , the authors used hybrid free-standing composite nanofibers as sensing platforms to identify volatile amines (ammonia, methylamine and trimethylamine), as one of the main components of the gas produced in the process of meat spoilage, and to monitor fish freshness at room temperature.
Abstract: Food safety and quality control have become nowadays a major priority for the sake of public health to protect consumers from the risks of foodborne diseases and food poisoning. For instance, in the case of the decomposition of meat protein, ammonia and biogenic amines content can be used as a parameter to evaluate meat quality. However, practical analytical methods for in loco evaluation of amines release by meat are still on demand. Herein, we report hybrid free-standing composite nanofibers as sensing platforms to identify volatile amines (ammonia, methylamine and trimethylamine), as one of the main components of the gas produced in the process of meat spoilage, and to monitor fish freshness at room temperature. For that purpose, SiO2:In2O3, SiO2:ZnO and SiO2 nanofibers, prepared by electrospinning followed by thermal treatment, were deposited onto interdigitated electrodes and then modified with polyaniline and poly(styrene sulfonate). Seven sensing units of distinct compositions were employed in an impedimetric electronic nose, and multidimensional projection was used to help in the discrimination of standard analytes as well as of analytes released during the deterioration of fish real samples. The frequency selection resulted in improved discrimination by multidimensional projection and the sensor array showed an excellent performance to be applied in fish spoilage monitoring.
19 citations
TL;DR: In this article , the degradation of methylparabenaben (MeP) from aqueous media using Fenton, photo-fenton, electro-Fenton (EF), and electrochemical oxidation (EO) was investigated.
Abstract: Endocrine disruptors are often reported in the literature as recalcitrant pollutants in aquatic ecosystems. For this reason, the present study focused on advanced oxidation processes, including Fenton, photo-Fenton, electro-Fenton (EF), and electrochemical oxidation (EO) as an alternative to the degradation of Methylparaben (MeP) from aqueous media. The degradation of MeP by Fenton based processes was completed in 20 min under optimal conditions (16 mg L−1 Fe2+ and 62 mg L−1 H2O2), while for the Photo-Fenton process by a reactor with a 4 W UV lamp, 4 mg L−1 Fe2+ and 52 mg L−1 H2O2, the complete degradation was attained within 16 min. Interestingly, outstanding results were achieved in the Electro-Fenton process carried out in a reactor equipped with a Ti/Ru0,3Ti0,7O2 as a cathode and a platinum anode, which, under optimized conditions (i.e. 4 mg L−1 Fe2+, j = 25 mA cm−2 and 0.05 mol L−1 Na2SO4) only 10 min was required to completely remove the contaminant from both synthetic and tap water. The MeP removal followed pseudo-first-order reaction kinetics in the following order: Electrochemical oxidation (EO) < Fenton < photo-Fenton < electro-Fenton (EF). Finally, after a comparison with the available literature concerning the oxidation of MeP, the EF system here proposed is presented as among the best in removal rate and mineralization as compared with other AOPs, performing better even in real water matrices.
19 citations
TL;DR: In this paper, the influence of alloy-support synergy in the catalytic performance of Ni5Ga3 supported on SiO2, CeO2 and ZrO2 was investigated by combining in-depth structural, chemical and spectroscopic characterization and density functional theory (DFT) calculations.
Abstract: Supported Ni-Ga alloys have emerged as potential catalyst to mitigate CO2 emissions by its conversion into methanol at mild conditions, however, its performance depends on the optimization of the alloy-support effects, which is unclear up to now. Herein, we investigate the influence of alloy-support synergy in the catalytic performance of Ni5Ga3 supported on SiO2, CeO2, and ZrO2, by combining in-depth structural, chemical and spectroscopic characterization and density functional theory (DFT) calculations. In situ DRIFTS confirmed further hydrogenation of key reaction intermediates in Ni5Ga3/ZrO2 surface, while weak CO2 adsorption in Ni5Ga3/SiO2 avoided intermediate stabilization on the surface and, strong interaction with Ni5Ga3/CeO2 poisoned interface active sites. Additionally, the relative energies of reactants and key intermediates in the three distinct regions of the catalyst (support surface, alloy surface, and alloy-support interface), calculated through DFT, allowed us to propose a reaction mechanism for the most promising catalyst, Ni5Ga3/ZrO2.
TL;DR: In this article , the authors reported the experimental realization of a quantum battery based on superconducting qutrit, which explores dark and bright states to achieve stable and powerful charging processes, respectively.
Abstract: Abstract Quantum batteries are miniature energy storage devices and play a very important role in quantum thermodynamics. In recent years, quantum batteries have been extensively studied, but limited in theoretical level. Here we report the experimental realization of a quantum battery based on superconducting qutrit. Our model explores dark and bright states to achieve stable and powerful charging processes, respectively. Our scheme makes use of the quantum adiabatic brachistochrone, which allows us to speed up the battery ergotropy injection. Due to the inherent interaction of the system with its surrounding, the battery exhibits a self-discharge, which is shown to be described by a supercapacitor-like self-discharging mechanism. Our results paves the way for proposals of new superconducting circuits able to store extractable work for further usage.
TL;DR: In this paper, the authors used electron paramagnetic resonance (EPR) and colorimetric methods to assess the antioxidant capacity of metal complexes. But, the EPR method has no influence on the results.
01 Jan 2022
TL;DR: The electrochemical method is the most effective, facile, and economical approach for the detection of small molecules as discussed by the authors , and it has been shown to be effective in many applications.
Abstract: The electrochemical method is the most effective, facile, and economical approach for the detection of small molecules.
TL;DR: The use of solid polymeric membranes has become promising for enantiomeric separation, due to the low cost and energy consumption, continuous operability and variety of materials as discussed by the authors.
TL;DR: A review of existing methods and emerging technologies in WEEE management, with special emphasis in characterization, extraction and reclamation of precious materials from waste computer and mobile phones, is presented in this article.
TL;DR: In this article, a scheelite-type tetragonal structure for CaMoO4 with slight distortion in MoO4 clusters between samples and confirmation of g-C3N4 presence in the powder was verified through X-ray diffraction, Raman, and FTIR spectroscopies.
TL;DR: In this article, the authors presented the most wide-ranging chemical investigation of coffee by-products collected from farms to factories, including eight never previously investigated, including bioactive neomangiferin, kaempferol-3-O-rutinoside, lup-20(29)-en-3 -one and 3,4-dimethoxy cinnamic acid.
TL;DR: In this article , the effect of metal ions on the structural, morphological and electronic properties of the as-prepared samples were investigated by X-ray diffraction (XRD), Raman spectroscopy, UV-visible diffuse reflectance spectra (DRS) and electron microscopy techniques.
TL;DR: Applications to real data and a Monte Carlo simulation study suggest that one of the methods of this class of methods for covariate categorization in regression models for binary response variables has a better predictive performance and a smaller computational cost than other methods available in the literature.
TL;DR: In this article , the authors presented a feasible realization of a quantum battery in a carboxylate-based metal complex, which can store a finite amount of extractable work under the form of quantum discord at room temperature and recharge by thermalization with a reservoir.
Abstract: The study of advanced quantum devices for energy storage has attracted the attention of the scientific community in the past few years. Although several theoretical progresses have been achieved recently, experimental proposals of platforms operating as quantum batteries under ambient conditions are still lacking. In this context, this work presents a feasible realization of a quantum battery in a carboxylate-based metal complex, which can store a finite amount of extractable work under the form of quantum discord at room temperature, and recharge by thermalization with a reservoir. Moreover, the stored work can be evaluated through non-destructive measurements of the compound's magnetic susceptibility. These results pave the way for the development of enhanced energy storage platforms through material engineering.
TL;DR: In this article, a survey of 104 firms and secondary industry-level data on turbulence and analyzed it with regression techniques, showing that, in turbulent environments, companies increase service customization instead of standardization and enhance service-centric business models, which benefits customer loyalty.
TL;DR: In this article , a graphene-based Electrical-Electrochemical Vertical Device (EEVD) point-of-care biosensor was used for serologic COVID-19 diagnosis.
TL;DR: In this article , a biochemical characterisation of Chlorella vulgaris biomass with daily supplementation of produced water was provided, and the simultaneous phytoremediation and production of biomolecules and bioproducts of commercial interest were analyzed and discussed.
Abstract: This work aimed to provide a biochemical characterisation of Chlorella vulgaris biomass cultivated with daily supplementation of produced water. The simultaneous phytoremediation and production of biomolecules and bioproducts of commercial interest were analysed and discussed. Cultures were grown in laboratory scale photobioreactors for 26 days in 1.5 L of BG11 medium, with daily supplementation of 50 mL of non-autoclaved produced water (TPW) or distilled water (TDW). Biomass production differed among the control (3.86 g L−1), TPW (1.69 g L−1), and TDW (1.82 g L−1). The TPW-treated culture showed a high concentration of carbohydrates (40.19 %) with a bioethanol production of 18.22 mL 100 g−1 of biomass. The content of carotenoids (2.4μg mL −1), protein (22.83 %), and lipids (21.53 %) were also determined. The lipid composition consisted mostly of palmitoleic (5.42 mg g−1), γ-linolenic (3.02 mg g−1), and linolelaidic (1.94 mg g−1) acids, which gave the oil the ideal properties for quality biodiesel. In addition, the high phytoremediation efficiency of heavy metals such as copper (70.00 %), manganese (76.89 %), and molybdenum (97.82 %), as well as total petroleum hydrocarbons (48.59 %), were also detected. Therefore, TPW can be a promising alternative for phytoremediation of chemical compounds, while utilising effluent from the oil industry to produce a high content of valuable biomass, biomolecules, and biofuels.
TL;DR: In this article , a systematic review and exploratory Life Cycle Assessment (LCA) of biomass briquettes and pellets produced in Latin America, and suggests short-term opportunities and political implications.
Abstract: The world market for solid biofuels has increased in the last few years, with special attention to the production of pellets and briquettes in emerging bioeconomies. This study presents a systematic review and exploratory Life Cycle Assessment (LCA) of biomass briquettes and pellets produced in Latin America, and suggests short-term opportunities and political implications. The review was organized following the scoping methodology en bloc with the Standardized Technique for Assessing and Reporting Reviews of Life Cycle Assessment Data - STARR-LCA, in Scopus, Web of Science and Scielo databases. A final list of 150 publications was selected. The review results showed that most of the publications were from Brazil, Colombia, Chile, Mexico and Costa Rica, and are mainly focused on exploring the thermo-mechanics properties of pellets and briquettes instead of the environmental impacts. Thus, an exploratory LCA was performed based on the data gathered from literature with a focus on global warming potential, terrestrial acidification potential, freshwater eutrophication potential, cumulative energy demand, land use and water consumption. Global warming results ranged from −68.7 (Chilean pellets) to 103 g CO2-eq (Brazilian charcoal briquettes), and pellet productions showed lower values of impacts (−68.7 to 1.33 g CO2-eq) per functional unit. The best scenario, however, was found for the Brazilian briquettes production contributing with less than 10% of the overall relative impacts for cumulative energy demand (0.340 MJ-eq), terrestrial acidification potential (8.59 mg SO2-eq), freshwater eutrophication potential (0.969 mg PO4-eq), land use (136 cm2a crop-eq) and water consumption (108 cm3), where urban forest residues were used as biomass. The worst-case scenario was found for the charcoal briquettes in Brazil and pellet productions from palm fruit branches in Colombia. Dedicated systems to the pellets/briquettes production seem to be more environmentally benign options than the multifunctional systems investigated. In terms of political implications, it was verified the great potential from these different types of densified biomass in improving and expanding emission trading systems both inside and outside Latin America.
TL;DR: In this paper, the AA2050-T7451 Alloy was evaluated in both air and aqueous saline environments to evaluate its fatigue crack propagation properties in corrosive environments.
TL;DR: In this paper, a high-throughput Density functional theory calculation was performed on CoCr2-yScyO4 (y = 0, 0.01,0.02, and 0.03) nanoparticles, and the structural analysis confirmed the crystalline nature with spinel cubic structure exhibiting an average particle size between 7 and 10nm.
TL;DR: In this paper, the disintegration of bioplastics was evaluated in both soil and composting, and it was shown that xylan/starch bioplastic formulations result in non-ecotoxic biodegradable materials.
TL;DR: In this paper, the authors assessed the environmental implications and ecological consequences of agricultural land use and glyphosate contamination on phytoplankton from 52 shallow lakes scattered over 180,000 km2 across the central pampas in Argentina, which lay on areas differentially impacted by glyphosate.
TL;DR: In this paper, a composite material comprised of Super P carbon black particles and chitosan was developed as an electrochemical sensor to determine macrolide antibiotics, including erythromycin, azithromycin and roxithimercin.