@article{Attah-Baah2024,

title = {Unveiling the impact of Fe-doping concentration on the local structure and morphological evolution of Cr2O3 nanoparticles},

author = {J.M. Attah-Baah and C. Santos and R.S. Silva and J.L. Oliveira and R.F. Jucá and B.F.O. Costa and R.S. Matos and Márcia Tsuyama Escote and R.S. Silva and M.V.S. Rezende and N.S. Ferreira},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0272884224028359},

doi = {10.1016/j.ceramint.2024.06.389},

issn = {0272-8842},

year  = {2024},

date = {2024-10-00},

urldate = {2024-10-00},

journal = {Ceramics International},

volume = {50},

number = {19},

pages = {35714--35724},

publisher = {Elsevier BV},

abstract = {A series of Cr2−xFexO3 (0.0 ≤ x ≤ 0.3) nanoparticles were successfully synthesized using a sol-gel-based method. Analysis through XRD and SAED of both pure and Fe-doped Cr2O3 nanoparticles revealed a rhombohedral structure belonging to the R 

 space group, without the formation of secondary phases or Fe clusters. Fe ions were well integrated, as indicated by fluctuations in lattice parameters, and lattice strain. The crystallite size decreased from 38.42 to 27.54 nm with increasing doping concentration. HRTEM images depicted evenly distributed nanoparticles. At lower dopant concentrations (x = 0.1), smaller and more heterogeneous nanorod-like structures emerged, with average sizes and lengths of 36.56 and 39 nm, respectively. Increasing the doping content to x = 0.2 resulted in a morphological shift towards semi-spherical and ellipsoidal shapes, with average dimensions of 22.84 and 31 nm, respectively. At higher doping levels (x = 0.3), nanoparticles grew to 66.5 nm in size and exhibited a spherical morphology. Raman and Fourier transform infrared spectra showed red-shifting of absorption bands with increasing Fe content, attributed to variations in bond length and Cr/Fe–O–Cr/Fe structural perturbation. XPS and Mössbauer spectroscopy analyses confirmed the oxidation states of Fe3+ and ionized oxygen vacancies in the crystal lattice of Cr2O3 nanoparticles. Higher values of quadrupolar splitting Δ indicated greater structural disorder induced by Fe3+ in octahedral positions and in an oxygen-deficient environment. Atomistic simulations confirmed that Fe3+ dopants can induce the presence of vacancy-complexes, forming a stable double-defect configuration with vacant Cr sites along the c-axis, proximal to oxygen vacancies with a single positive charge. These findings offer both experimental and theoretical insights into the dynamics of structural defects in trivalent transition metal doping of Cr2O3 nanoparticles, which holds significant implications for spintronics research.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{GabrieldeAssis2024c,

title = {Preparation and Characterization of a Disilylated Naphthalenediimide Molecular Crystal: Perspectives for Organosilica Mesoporous Materials},

author = {Renan Gabriel de Assis and Marcos de Oliveira Junior and Márcia Tsuyama Escote and Carlos Basílio Pinheiro and José Javier Sáez Acuña and Fabio Furlan Ferreira and Luana Sucupira Pedroza and Sergio Brochsztain and Thiago Branquinho de Queiroz},

url = {https://pubs.acs.org/doi/full/10.1021/acsaenm.4c00341},

doi = {10.1021/acsaenm.4c00341},

issn = {2771-9545},

year  = {2024},

date = {2024-07-26},

urldate = {2024-07-26},

journal = {ACS Appl. Eng. Mater.},

volume = {2},

number = {7},

pages = {1976--1986},

publisher = {American Chemical Society (ACS)},

abstract = {Naphthalenetetracarboxylic diimides (NDIs) are efficient electron acceptors due to their high electron affinity. They are applied in heterogeneous catalysis and organic electronics. In this work, we report, for the first time, the synthesis of N,N′-bis[3-(triethoxysilyl)propyl]-1,4,5,8-naphthalenediimide (NDI-silane) as a molecular crystal obtained from recrystallization in petroleum ether. The compound is stable in air conditions and chloroform solution. Its crystal structure was determined by single-crystal X-ray diffraction. We have characterized the intermolecular dispersive interactions by density functional theory calculations, indicating that the stability of the crystal in air conditions is related to dispersive interactions. Furthermore, we characterize the optical and photoelectrical properties of thin NDI-silane films, demonstrating photoinduced conductivity over a wide range of temperatures (10–300 K). Remarkably, a venture of NDI-based organosilica can be obtained from stable NDI-silane crystals, prominent materials in organoelectronics and photocatalysis. As a proof of concept, we prepare mesoporous organosilicas with 100% NDI-silane using the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate as a templating and sol–gel catalytic agent. These materials show a well-formed organosilica network, presenting only T3 and T2 Si species, as probed by solid-state 29Si NMR. As a result, the mesoporous materials are considerably more resistant to thermal degradation than the crystals, being stable up to 450 °C. According to N2 adsorption isotherms and transmission electron microscopy images, they demonstrate microporous and mesoporous structures associated with narrow slitlike pores.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{deOliveira2024b,

title = {Versatile r.f. magnetron sputtering doping method to produce aluminum‐doped zinc oxide films},

author = {Gabriel Henrique Inácio de Oliveira and Márcia Tsuyama Escote and Iseli L. Nantes and Denise Criado},

url = {https://ceramics.onlinelibrary.wiley.com/doi/abs/10.1111/jace.19753},

doi = {10.1111/jace.19753},

issn = {1551-2916},

year  = {2024},

date = {2024-07-00},

urldate = {2024-07-00},

journal = {J Am Ceram Soc.},

volume = {107},

number = {7},

pages = {4729--4737},

publisher = {Wiley},

abstract = {Aluminum-doped zinc oxide Al:ZnO (AZO) is a non-toxic material applied as a transparent conductive oxide film. In this study, we report on the structural, optical, and electrical properties of AZO films obtained by thermally oxidizing aluminum-doped Zn films produced by a versatile and low-cost method of doping using the magnetron sputtering technique deposition. We use aluminum wire above the zinc target to produce Al:Zn films. The influence of r.f. power and different Al wire lengths on the AZO film properties were studied. The resulting AZO films exhibited Al concentrations of up to 2.85% and an optical gap between 3.22 and 3.29 eV. The transmittance was greater than 80% for all samples, and the electrical resistivity decreased by two orders of magnitude with Al doping. As a result, the sample with an aluminum concentration of approximately 1% had the lowest resistivity. In this work, it was possible to relate the lower resistivity with larger grain size and smaller concentrations of defects or vacancies.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Filho2024,

title = {A New Method of Neodymium-Iron-Boron Magnets/Reduced Graphene Oxide Manufacturing Without a Controlled Atmosphere},

author = {J. C. Silva Filho and S. C. Silva and H. Takiishi and S. R. Janasi and L. G. Martinez and J. F. Q. Rey and Márcia Tsuyama Escote},

url = {https://link.springer.com/article/10.1007/s11837-024-06525-2},

doi = {10.1007/s11837-024-06525-2},

issn = {1543-1851},

year  = {2024},

date = {2024-06-00},

urldate = {2024-06-00},

journal = {JOM},

volume = {76},

number = {6},

pages = {3073--3080},

publisher = {Springer Science and Business Media LLC},

abstract = {This paper introduces an innovative manufacturing method for NdFeB magnets, involving the integration of reduced graphene oxide (rGO) during mechanical milling (MM) to counteract powder ignition, a common issue in oxygen-rich environments. The NdFeB alloy underwent hydrogen decrepitation before being mechanically milled with varying rGO quantities in ambient air. Raman and X-ray diffraction (XRD) analyses confirmed the successful production of rGO samples with a minimal number of layers. The XRD analysis of the NdFeB/rGO powder demonstrated that all the diffraction peaks corresponded to the Nd2Fe14BH1.86 phase, with no carbides or other carbon compounds detected. Transmission electron microscopy revealed rGO encapsulating the NdFeBrGO particles, while scanning electron microscopy of the resulting magnets (samples 1, 2, and 3) displayed grain sizes ranging from 0.5 µm to 6.8 µm. These manufacturing variations led to a diverse range of magnetic properties: remanence (Br) varied from 0.5 T to 1.13 T, intrinsic coercivity (iHc) ranged from 263.5 kA m−1 to 776.1 kA m−1, and maximum energy product (BHmax) spanned from 21.0 kJ m−3 to 232.3 kJ m−3. Remarkably, the most favorable Br, iHc, and BHmax values were observed in Sample 0.02 wt.% rGO, closely aligning with the characteristics typically found in commercial NdFeB.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{BoghosianPatricio2024,

title = {Assembling bifunctional ceria-zirconia electrocatalyst for efficient electrochemical conversion of methane at room temperature},

author = {Nicole Boghosian Patricio and Juliano Carvalho Cardoso and Márcia Tsuyama Escote and Alexandre José de Castro Lanfredi and Abhaya Datye and Hien Pham and Caue Ribeiro and Fabio Coral Fonseca and Elisabete Inacio Santiago},

url = {https://www.sciencedirect.com/science/article/abs/pii/S1385894724024380},

doi = {10.1016/j.cej.2024.150951},

issn = {1385-8947},

year  = {2024},

date = {2024-05-00},

urldate = {2024-05-00},

journal = {Chemical Engineering Journal},

volume = {488},

publisher = {Elsevier BV},

abstract = {The electrochemical conversion of methane to C2 compounds at room temperature is reported using CeO2-ZrO2 electrocatalysts. The mixed oxide electrocatalysts produced methanol, ethanol, and acetone, along with traces of acetaldehyde and isopropanol, under a polarization of 1.2 V with ∼ 50 % Faradaic efficiency. Detailed characterization of the CeO2-ZrO2 revealed the formation of nanoparticles (7–9 nm mean size) composed of ceria-zirconia solid solution or a mixture of ceria with both tetragonal and monoclinic zirconia polymorphs depending on the assembling configuration of the electrocatalyst. Samples with separated phases and limited solid solution formation showed the highest electrochemical activity, indicating that an optimal assembly of ceria and zirconia was crucial to achieving efficient conversion with high Faradaic efficiency and selectivity. Such high electrochemical activity observed for the phase separated CeO2-ZrO2 electrocatalyst suggests that a synergic effect between ceria and zirconia is required for the critical reaction steps, such as the activation and partial oxidation of methane. The experimental results point to credible routes to efficiently convert methane into valuable chemicals in mild conditions.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Maron2023,

title = {Enhanced pseudocapacitive behaviour in laser-written graphene micro-supercapacitors decorated with nickel cobalt sulphide nanoparticles},

author = {Guilherme K. Maron and Mateus G. Masteghin and Veridiana Gehrke and Lucas S. Rodrigues and José H. Alano and Jéssica H.H. Rossato and Valmor Roberto Mastelaro and Jairton Dupont and Márcia Tsuyama Escote and S. Ravi P. Silva and Neftali Lenin Villarreal Carreno},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0025540823003458},

doi = {10.1016/j.materresbull.2023.112490},

issn = {0025-5408},

year  = {2023},

date = {2023-12-00},

urldate = {2023-12-00},

journal = {Materials Research Bulletin},

volume = {168},

publisher = {Elsevier BV},

abstract = {The next generation of energy storage technologies requires enhanced fabrication techniques such as the use of CO2 infrared lasers to pattern micro-supercapacitor (MSC) electrodoes. This study reports direct-writen laser-induced graphene (LIG) micro-supercapacitors with electrodepositated NiCo2S4- nanoparticles on commercial polyimide sheets. X-ray photoelectron spectroscopy (XPS) combined with transmission electron microscopy (TEM) showed NiCo2S4 nanoparticles decorating the graphene, within a highly porous carbon-based electrode. The LIG/NiCo2S4 exhibited outstanding properties with a specific capacitance of 30.4 mF cm−2 at 0.75 mA cm−2 and an energy density of 16.9 µWh cm−2 at a power density of 367.5 µW cm−2. High capacitance retention of 1.22-fold was measured after 5000 cycles of charge/discharge, and of ∼90% when bent to 120˚ angle. Here, it is demonstrated that surface decoration is an effective route in improving LIG MSC storage properties, and that the LIG/NiCo2S4 MSC is suitable for use in next generation of flexible and miniaturized portable devices.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Meirelles2023,

title = {Magnetic Adsorbent Based on Faujasite Zeolite Decorated with Magnesium Ferrite Nanoparticles for Metal Ion Removal},

author = {Mariana Rodrigues Meirelles and João Otávio Donizette Malafatti and Márcia Tsuyama Escote and Alexandre Henrique Pinto and Elaine Cristina Paris},

url = {https://www.mdpi.com/2312-7481/9/5/136},

doi = {10.3390/magnetochemistry9050136},

issn = {2312-7481},

year  = {2023},

date = {2023-05-00},

urldate = {2023-05-00},

journal = {Magnetochemistry},

volume = {9},

number = {5},

publisher = {MDPI AG},

abstract = {Magnetic nanoparticles are a promising alternative as a support in adsorption processes, aiming at the easy recovery of the aqueous medium. A faujasite zeolite (FAU) surface was decorated with magnesium ferrite (MgFe2O4) nanoparticles. FAU is a porous adsorbent with high specific surface area (SSA) and chemical stability. The FAU:MgFe2O4 nanocomposite 3:1 ratio (w w−1) promotes the combination of the surface and magnetic properties. The results showed the effectiveness of the MgFe2O4 immobilization on the FAU surface, exhibiting a high SSA of 400 m2 g−1. The saturation magnetization (Ms) was verified as 5.9 emu g−1 for MgFe2O4 and 0.47 emu g−1 for FAU:MgFe2O4, an environmentally friendly system with soft magnetic characteristics. The magnetic nanocomposite achieved high adsorption values of around 94% removal for Co2+ and Mn2+ ions. Regarding its reuse, the nanocomposite preserved adsorption activity of above 65% until the third cycle. Thus, the FAU:MgFe2O4 nanocomposite presented favorable adsorptive, magnetic, and recovery properties for reuse cycles in polluted water.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Silva2022d,

title = {Griffiths-like phase, large magnetocaloric effect, and unconventional critical behavior in the <mml:math xmlns:mml=},

author = {R. S. Silva and C. Santos and Márcia Tsuyama Escote and B. F. O. Costa and N. O. Moreno and S. P. A. Paz and R. S. Angélica and N. S. Ferreira},

url = {https://journals.aps.org/prb/abstract/10.1103/PhysRevB.106.134439},

doi = {10.1103/physrevb.106.134439},

issn = {2469-9969},

year  = {2022},

date = {2022-10-00},

urldate = {2022-10-00},

journal = {Phys. Rev. B},

volume = {106},

number = {13},

publisher = {American Physical Society (APS)},

abstract = {A B-site disordered double perovskite NdSrCoFe⁢O6 was successfully synthesized by the conventional sol-gel method. Detailed experimental analyses revealed that NdSrCoFe⁢O6 crystallizes in the orthorhombic 𝑃⁢𝑛⁢𝑚⁢𝑎 space group, in which Co2+/3+ and Fe3+/4+ ions are randomly distributed at the BB′ sites, and Sr2+ and Nd3+ ions are respectively ordered at the A and A′ sites in an alternating arrangement along the 𝑐 direction. NdSrCoFe⁢O6 has a semimetallic-to-semiconducting transition nature, and a paramagnetic-ferromagnetic (FM) second-order phase transition originating from the complex hybridization between Co 3⁢𝑑 and O 2⁢𝑝 states is also found to occur at 𝑇C≈150 K. Then the spin coupling between Fe4+↔Co3+ and Fe3+↔Co2+ randomly distributed on the B and B′ sites leads to a FM cluster spin-glass behavior with characteristic parameters of 𝑘=0.01, 𝑇SG=82.7 K, 𝑧⁢𝑣=1.89, and 𝜏0=0.46×10−4 s. Additionally, Griffiths-like phase behavior was observed in the region 𝑇C<𝑇<𝑇GP, with 𝑇GP=245 K, consistent with the power law exponent of 𝜆=0.74. The maximum isothermal magnetic entropy change −Δ⁢𝑆max

𝑀≈1.84Jk⁢g−1K−1 and relative cooling power ≈43.8Jk⁢g−1 under a field of 40 kOe also indicate a magnetocaloric coupling wherein fitted critical exponents 𝛽=1.384, 𝛾=0.621, and 𝛿=1.421 are far from any conventional universality class. Density functional theory calculations demonstrated spin short- and long-range ordering competitions for Fe/Co at BB′ sites, which arise predominantly from the stronger negatively charged ligand interaction with Co 3⁢𝑑 orbitals and the weakest Fe 3⁢𝑑 orbitals. This unconventional behavior is expected to be the main reason for the experimentally observed magnetic exchange distance decreasing with 𝐽⁡(𝑟)≈𝑟−4.7.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ganharul2022b,

title = {Outstanding cooperation of all-inorganic CsPbI3 perovskite with TiO2 forming composites and heterostructures for photodegradation},

author = {Grace Kelly Q. Ganharul and Aryane Tofanello and Ariany Bonadio and André L. M. Freitas and Márcia Tsuyama Escote and André S. Polo and Iseli L. Nantes-Cardoso and José Antonio Souza},

url = {https://link.springer.com/article/10.1007/s10853-022-07737-0},

doi = {10.1007/s10853-022-07737-0},

issn = {1573-4803},

year  = {2022},

date = {2022-09-00},

urldate = {2022-09-00},

journal = {J Mater Sci},

volume = {57},

number = {36},

pages = {17363--17379},

publisher = {Springer Science and Business Media LLC},

abstract = {Semiconductor materials have a great potential to be used as a photocatalyst in several applications from dye degradation and water treatment up to solar cells. All-inorganic halide perovskite CsPbI3 and TiO2 with anatase structure were synthesized, studied, and compared as single samples and also forming heterostructures and composites. Structural, morphological, and optical characterizations reveal the successful synthesis of CsPbI3 and TiO2 compounds and the formation of both composites and heterostructures CsPbI3/TiO2. Methylene blue organic dye was used as a model for the study and evaluation of the photocatalytic activity exhibited by the produced semiconducting samples. The photocatalytic activity for MB degradation in methanol was investigated separately for TiO2 and CsPbI3 and their formation as composites and heterostructures. We have observed that when CsPbI3 perovskite is combined with TiO2, a cooperative mechanism involving the formation of intermediate phases promotes photobleaching with a kinetic constant rate much higher than both compounds separated or forming heterostructures. The CsPbI3/TiO2 causes MB mineralization by an oxygen-dependent mechanism. On the other hand, very high constant rate of the MB photodegradation can be observed by CsPbI3 perovskite even in a solution without the presence of dissolved oxygen. The presence of structural defects interstitials, vacancies, and under-coordinated Pb2+ ions on the surface of the perovskite particles may be formed during light irradiation and act as catalytic centers. The kinetic constant rate and the mechanism of MB photobleaching and the occurrence of dye mineralization can be tuned in feasible by simple strategies involving the formation of heterostructure and composites.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Paris2022,

title = {CuO nanoparticles decorated on hydroxyapatite/ferrite magnetic support: photocatalysis, cytotoxicity, and antimicrobial response},

author = {Elaine Cristina Paris and João Otávio Donizette Malafatti and Ailton José Moreira and Lílian Cruz Santos and Camila Rodrigues Sciena and Alessandra Zenatti and Márcia Tsuyama Escote and Valmor Roberto Mastelaro and Miryam Rincón Joya},

url = {https://link.springer.com/article/10.1007/s11356-021-18263-y},

doi = {10.1007/s11356-021-18263-y},

issn = {1614-7499},

year  = {2022},

date = {2022-06-00},

urldate = {2022-06-00},

journal = {Environ Sci Pollut Res},

volume = {29},

number = {27},

pages = {41505--41519},

publisher = {Springer Science and Business Media LLC},

abstract = {Photocatalysts supported in magnetic nanocomposites for application in environmental remediation processes have been evaluated for removing contaminants due to easy recovery and low toxicity to the ecosystem. In this work, copper oxide (CuO) nanoparticles with photocatalytic properties were decorated on magnetic support constituted by hydroxyapatite (HAP) and ferrite to achieve efficiency in contaminated water remediation under visible light irradiation. First, nanomaterials were obtained by precipitation route, allowing fast and straightforward synthesis. Then, CuO nanoparticles with 6 nm diameter were efficiently decorated on magnetic support (25 nm), showing a high ability to absorb visible light irradiation (bandgap) to promote electronic transition and charge separation. Under visible irradiation, CuO promotes the H2O2 reduction in the conduction band (BC) to form hydroxyl radicals (•OH), which are responsible for rhodamine B (RhB) dye degradation (> 90% in 60 min). Magnetic hysteresis assays confirmed the magnetic properties of HAP/ferrite support, which enabled the recovery and reuse of the magnetic photocatalyst efficiently up to 3 cycles. Due to low Cu2+ leaching after the photocatalytic application stage, cytotoxicity assay for the Allium cepa seeds did not exhibit abnormal cells other than those commonly found. Furthermore, the CuO-decorated nanoparticles showed bactericidal activity against S. aureus (Gram-positive) and E. coli (Gram-negative) microorganisms, being more significant for the first one. Thus, the developed nanocomposite of CuO nanoparticles decorated on the magnetic support surface showed to be a complete system for water remediation, acting in contaminant degradation under visible light irradiation and bactericidal control with environmentally friendly characteristics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Rossato2022,

title = {A Flexible Electrochemical Biosensor Based on NdNiO3 Nanotubes for Ascorbic Acid Detection},

author = {Jéssica H. H. Rossato and Marcely E. Oliveira and Bruno V. Lopes and Betty B. Gallo and Andrei B. La Rosa and Evandro Piva and David Barba and Federico Rosei and Neftali L. V. Carreño and Márcia Tsuyama Escote},

url = {https://pubs.acs.org/doi/abs/10.1021/acsanm.1c03992},

doi = {10.1021/acsanm.1c03992},

issn = {2574-0970},

year  = {2022},

date = {2022-03-25},

urldate = {2022-03-25},

journal = {ACS Appl. Nano Mater.},

volume = {5},

number = {3},

pages = {3394--3405},

publisher = {American Chemical Society (ACS)},

abstract = {Flexible and wearable electrochemical biosensors are considered a non-invasive tool for monitoring biological substances, thus attracting attention due to the simple assembly, fast response, ultra-sensitivity, and low cost. Among the substances detected by electrochemical methods, ascorbic acid (AA) stands out, as its presence in the body promotes adequate physiological functions of the immune, central nervous, and circulatory systems, thus preventing and treating various diseases. Herein, this work focuses on the use of nanostructured NdNiO3 compounds in an alternative flexible biosensor for AA detection by electrochemical sensing. Here, 1D nanostructures of NdNiO3 were obtained by wet pore filling of a mesoporous aluminum oxide template. To the best of our knowledge, no electrochemical biosensors using NdNiO3 nanotubes supported onto GO flexible electrodes have been reported for AA or other bioanalyte detection. Next, an electrochemical biosensor for AA was built using a laser-induced graphene (GO) electrode and two different NdNiO3 (NNO) nanotubes, one with an external diameter of 20 nm (NNO20) and the other with 100 nm (NNO100). The size effect and Ni3+/Ni2+ ratio influence on the sensing properties can be verified through electrochemical characterization. The GO/NNO20 and GO/NNO100 biosensors presented a detection range of 30 to 1100 μmol L–1, but the minimum detectable limit (3.8 μmol L–1) and sensitivity (0.031 μA μM–1 cm–2) are significantly better for the GO/NNO100 device. These outstanding results make both devices competitive with other AA devices listed in the literature. We also simulated the biosensors’ real application and verified that these biosensors could detect AA in synthetic sweat and under application of mechanical deformations. Thus, the GO/NNO biosensors showed a promising alternative to the development of real-time monitoring, POC devices, and flexible wearable electrochemical devices to use in AA detection. Future works should address the potential to detect other bioanalytes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{HenriquedaSilvaCavalcanti2022,

title = {Immobilization of Thermomyces lanuginosus lipase via ionic adsorption on superparamagnetic iron oxide nanoparticles: Facile synthesis and improved catalytic performance},

author = {Marcello Henrique da Silva Cavalcanti and Levy Bueno Alves and Alfredo Duarte and Adriano Aguiar Mendes and José Maurício Schneedorf Ferreira da Silva and Nelson José Freitas da Silveira and Marcia Tsuyama Escote and Luciano Sindra Virtuoso},

url = {https://www.sciencedirect.com/science/article/abs/pii/S1385894721057016},

doi = {10.1016/j.cej.2021.134128},

issn = {1385-8947},

year  = {2022},

date = {2022-03-00},

urldate = {2022-03-00},

journal = {Chemical Engineering Journal},

volume = {431},

publisher = {Elsevier BV},

abstract = {The present work describes a simple, rational, and optimized methodology for the immobilization of lipase from Thermomyces lanuginosus (TLL) via ionic adsorption on non-commercial superparamagnetic iron oxide nanoparticles (SPIONs). First, the surface loads of both the enzyme and nanoparticles were evaluated by zeta potential measurements over a wide pH range. In addition, the loading surface of TLL was mapped computationally using the information obtained from the Protein Data Bank (PDB) under three different pH conditions. This information allowed to conduct the directional immobilization of the lipase on the surface of the SPIONs in order to maximize the lipase–SPION interaction and keep the enzyme’s active sites facing the solution. TLL was immobilized at a low ionic strength (5 mmol L–1) on the SPIONs under optimized conditions (sodium acetate buffer, pH 4, 25 °C using an initial enzyme loading of 30 mg per gram of support). Under such conditions, almost full immobilization (99.49% adsorption capacity) was observed. The prepared biocatalyst retained 62.3% of its hydrolytic activity relative to the initial activity of the free lipase. Maximum catalytic efficiency (or acid conversion percentage) of 80% in decyl oleate synthesis performed in a solvent-free system was observed after 12 consecutive cycles of reaction of 180 min each. In addition, the lipase–nanoparticle interaction was also evaluated by fluorescence spectroscopy and the thermodynamic parameter values Δ

, 

, and, 

 were found, which is consistent with the occurrence of predominantly ionic interactions. These results clearly show the promising use of the prepared biocatalyst to catalyze decyl oleate production, an ester with emollient properties, in an eco-friendly process (solvent-free system).},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Oliveira2022,

title = {Electrochemical Biosensor Based on Laser-Induced Graphene for COVID-19 Diagnosing: Rapid and Low-Cost Detection of SARS-CoV-2 Biomarker Antibodies},

author = {Marcely Echeverria Oliveira and Bruno Vasconcellos Lopes and Jéssica Helisa Hautrive Rossato and Guilherme Kurz Maron and Betty Braga Gallo and Andrei Borges La Rosa and Raphael Dorneles Caldeira Balboni and Mariliana Luiza Ferreira Alves and Marcos Roberto Alves Ferreira and Luciano da Silva Pinto and Fabricio Rochedo Conceição and Evandro Piva and Claudio Martin Pereira de Pereira and Márcia Tsuyama Escote and Neftali Lenin Villarreal Carreño},

url = {https://www.mdpi.com/2571-9637/5/1/12},

doi = {10.3390/surfaces5010012},

issn = {2571-9637},

year  = {2022},

date = {2022-03-00},

urldate = {2022-03-00},

journal = {Surfaces},

volume = {5},

number = {1},

pages = {187--201},

publisher = {MDPI AG},

abstract = {The severe acute respiratory syndrome originated by the new coronavirus (SARS-CoV-2) that emerged in late 2019, known to be a highly transmissible and pathogenic disease, has caused the COVID-19 global pandemic outbreak. Thus, diagnostic devices that help epidemiological public safety measures to reduce undetected cases and isolation of infected patients, in addition to significantly help to control the population’s immune response to vaccine, are required. To address the negative issues of clinical research, we developed a Diagnostic on a Chip platform based on a disposable electrochemical biosensor containing laser-induced graphene and a protein (SARS-CoV-2 specific antigen) for the detection of SARS-CoV-2 antibodies. The biosensors were produced via direct laser writing using a CO2 infrared laser cutting machine on commercial polyimide sheets. The presence of specific antibodies reacting with the protein and the K3[Fe(CN)6] redox indicator produced characteristic and concentration-dependent electrochemical signals, with mean current values of 9.6757 and 8.1812 µA for reactive and non-reactive samples, respectively, proving the effectiveness of testing in clinical samples of serum from patients. Thus, the platform is being expanded to be measured in a portable microcontrolled potentiostat to be applied as a fast and reliable monitoring and mapping tool, aiming to assess the vaccinal immune response of the population.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ganharul2021b,

title = {Disclosing the hidden presence of Ti3+ ions in different TiO2 crystal structures synthesized at low temperature and photocatalytic evaluation by methylene blue photobleaching},

author = {Grace Kelly Q. Ganharul and Aryane Tofanello and Ariany Bonadio and André L. M. Freitas and Márcia Tsuyama Escote and André S. Polo and Iseli L. Nantes-Cardoso and José Antonio Souza},

url = {https://link.springer.com/article/10.1557/s43578-021-00342-y},

doi = {10.1557/s43578-021-00342-y},

issn = {2044-5326},

year  = {2021},

date = {2021-08-28},

urldate = {2021-08-28},

journal = {Journal of Materials Research},

volume = {36},

number = {16},

pages = {3353--3365},

publisher = {Springer Science and Business Media LLC},

abstract = {We have performed a comprehensive study on the relationship among different crystal structures of TiO2, appearance of self-doping Ti3+ ions at low synthesis temperature, and photodegradation efficiency of the organic dye methylene blue (MB). Samples with anatase and rutile phase of TiO2 were synthesized by microwave assisted hydrothermal method. The anatase structured samples promote faster MB photobleaching in comparison with the rutile one. Electron paramagnetic resonance and X-ray photoelectron spectroscopies disclosed the presence of self-doping Ti3+ ions in the anatase that are completely absent in the rutile phase. The creation of these Ti3+ ions driven by anatase structure due to its lower vacancy formation energy induces mid-gap states within the band-gap of TiO2, which in turn can enhance the visible light absorption. Understanding the precursors at low synthesis temperatures of defects and self-doping formations can shed light on both the efficiency evolution and photocatalytic nature of this important semiconducting material.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Lelo2021,

title = {Vanadium effect over γ-Al2O3-supported Ni catalysts for valorization of glycerol},

author = {Ricardo Velloso Lelo and Guilherme Kurz Maron and Anderson Thesing and José Henrique Alano and Lucas da Silva Rodrigues and Bruno da Silveira Noremberg and Marcia Tsuyama Escote and Antoninho Valentini and Luiz Fernando Dias Probst and Neftali Lenin Villarreal Carreño},

url = {https://www.sciencedirect.com/science/article/abs/pii/S0378382021000527},

doi = {10.1016/j.fuproc.2021.106773},

issn = {0378-3820},

year  = {2021},

date = {2021-06-00},

urldate = {2021-06-00},

journal = {Fuel Processing Technology},

volume = {216},

publisher = {Elsevier BV},

abstract = {The production of biodiesel generates high amounts of glycerol as a byproduct. Thus, alternatives to reuse this byproduct need to be investigated. In this study, we evaluated the valorization of glycerol through a catalytic process with nickel/vanadium supported on γ-Al2O3 in different compounds, followed by the electrochemical characterization for energy storage of carbon-based materials (coke) produced during the catalytic reaction. The structural, morphological and compositional properties of the catalysts and carbon-based materials were investigated by X-ray diffraction, N2-physisorption, thermogravimetric analysis, Raman spectroscopy, inductively coupled plasma mass spectroscopy, scanning electron microscopy and high-resolution transmission electron microscopy. The glycerol reaction generated acrolein, dihydroxyacetone and methanol as main products. The addition of nickel to the catalyst increased the selectivity for methanol by ca. 44% for the catalytic cracking; while for the vapor reforming is observed a higher H2 production. The use of the coke residues for energy storage was investigated through cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. A maximum specific capacitance of 7.3 F g−1 at 3.75 mA g−1 was achieved, attributed to the high surface area, ease of access of the electrolyte ions to the entire surface of the electrode. This research reveals a zero-waste approach for the glycerol valorization reaction.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Paris2020,

title = {Nb2O5 nanoparticles decorated with magnetic ferrites for wastewater photocatalytic remediation},

author = {Elaine Cristina Paris and João Otávio Donizette Malafatti and Camila Rodrigues Sciena and Luiz Ferreira Neves Junior and Alessandra Zenatti and Márcia Tsuyama Escote and Ailton José Moreira and Gian Paulo Giovanni Freschi},

url = {https://link.springer.com/article/10.1007/s11356-020-11262-5},

doi = {10.1007/s11356-020-11262-5},

issn = {1614-7499},

year  = {2021},

date = {2021-05-00},

urldate = {2021-05-00},

journal = {Environ Sci Pollut Res},

volume = {28},

number = {19},

pages = {23731--23741},

publisher = {Springer Science and Business Media LLC},

abstract = {Nanotechnology has been studied on environmental remediation processes to foster greater photocatalysts efficiency and reuse in wastewater. This study investigated the photocatalytic efficiency and viability of niobium pentoxide (Nb2O5) nanoparticles decorated with magnetic ferrite (cobalt ferrite (CoFe2O4) or magnesium ferrite (MgFe2O4)) for atrazine photodegradation. Thus, the decorated Nb2O5 was synthesized by the polymeric precursor method, forming nanoparticles with sizes ranging from 25 to 50 nm. Nanocomposite elementary analyses showed a homogeneous distribution of elements on all particles surface. Efficient magnetic saturation was observed for pure CoFe2O4 (53 emu g−1) and MgFe2O4 (19 emu g−1) nanoparticles, promoting the magnetic removal of Nb2O5:CoFe2O4 and Nb2O5:MgFe2O4 nanocomposites. Photocatalytic assays showed 88% efficiency for atrazine photodegradation with all nanomaterials, which represented a 21% increase compared to photolysis in the 1st cycle. The magnetic nanocomposites when applied to a 5th cycle maintained the atrazine photodegradation activity. In this way, magnetic Nb2O5-based nanocomposites decorated with ferrite nanoparticles showed an efficient photocatalytic response, in addition to posterior magnetic removal from the aqueous medium. Therefore, the evaluated magnetic Nb2O5 nanocomposites may be an alternative to enhance the wastewater removal process and foster the reuse in advanced oxidative processes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}