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We're sorry but CNPEM - Repositório de Publicações Científicas doesn't work properly without JavaScript enabled. Please enable it to continue. REPOSITÓRIO DE PUBLICAÇÕES CIENTÍFICAS PesquisarLimpar Exibindo 513 resultados de 3872 Filtros aplicados: [ano de publicação: 2022, 2023, 2024] Electrical Conductivity Boost: In Situ Polypyrrole Polymerization in Monolithically Integrated Surface-Supported Metal-Organic Framework Templates 2024 Resumo: Recent progress in synthesizing and integrating surface-supported metal-organic frameworks (SURMOFs) has highlighted their potential in developing hybrid electronic devices with exceptional mechanical flexibility, film processability, and cost-effectiveness. However, the low electrical conductivity of SURMOFs has limited their use in devices. To address this, researchers have utilized the porosity of SURMOFs to enhance electrical conductivity by incorporating conductive materials. This study introduces a method to improve the electrical conductivity of HKUST-1 templates by in situ polymerization of conductive polypyrrole (PPy) chains within the SURMOF pores (named as PPy@HKUST-1). Nanomembrane-origami technology is employed for integration, allowing a rolled-up metallic nanomembrane to con... mais Periódico: Small Instalação: AFM,MNF,SEM-C1 Laboratório: LNNano Tipo: Artigo em Periódico Indexado Agência de fomento: CNPq - 305305/2016-6, CNPq - 306768/2019-4, CNPq - 408770/2018-0, CNPq - 465452/2014-0, FAPESP - 2014/25979-2, FAPESP - 2014/50906-9, FAPESP - 2016/25346-5, FAPESP - 2017/02317-2, FAPESP - 2017/25553-3, FAPESP - 2019/01561-2 Complemento: v.20, n.5, p.2305501, 2024 Autores: Vello, T. P. Albano, L. G. S. Santos, T. C. dos Colletti, J. C. Batista, C. C. S. Leme, V. F. C. Santos, T. C. dos Miguel, M. P. D. C. Camargo, D. H. S. Bof Bufon, C. C. DOI: 10.1002/smll.202305501 BiomaterialsBiotechnologyGeneral Materials ScienceGeneral Chemistry The discovery of aryl-2-nitroethyl triamino pyrimidines as anti-Trypanosoma brucei agents 2024 Resumo: Pteridine reductase 1 (PTR1) is a catalytic protein belonging to the folate metabolic pathway in Trypanosmatidic parasites. PTR1 is a known target for the medicinal chemistry development of antiparasitic agents against Trypanosomiasis and Leishmaniasis. In previous studies, new nitro derivatives were elaborated as PTR1 inhibitors. The compounds showing a diamino-pyrimidine core structure were previously developed but they showed limited efficacy. Therefore, a new class of phenyl-, heteroaryl-and benzyloxy-nitro derivatives based on the 2-nitroethyl-2,4,6-triaminopyrimidine scaffold were designed and tested. The compounds were assayed for their ability to inhibit T. brucei and L. major PTR1 enzymes and for their antiparasitic activity towards T. brucei and L. infantum parasites. To understa... mais Periódico: European Journal of Medicinal Chemistry Instalação: LNBio Laboratório: LNBio Tipo: Artigo em Periódico Indexado Agência de fomento: OUTRAS / OTHERS Complemento: v. 264, p. 115946, 2024 Autores: Linciano, P.Pozzi, C.Tassone, G. Landi, G.Mangani, S.Santucci, M.Luciani, R.Ferrari, S.Santarem, N.Tagliazucchi, L. Cordeiro da Silva, A.Tonelli, M. Tondi, D. Bertarini, L. Gul, S.Witt, G.Moraes, C. B. Costantino, L.Costi, M. P. DOI: 10.1016/j.ejmech.2023.115946 Organic ChemistryDrug DiscoveryPharmacologyGeneral MedicineDrug discoveryPteridine reductaseAntiparasitic agentsTrypanosoma bruceiLeishmania infantumSTRUCTURE-BASED DESIGNPTERIDINE REDUCTASEFEATURESINHIBITORS Tissue-level distribution and speciation of foliar manganese in Eucalyptus tereticornis by µ-SXRF and µ-XANES shed light on its detoxification mechanisms 2024 Resumo: This study is the first to investigate the speciation and spatial distribution patterns of manganese (Mn) accumulated at elevated concentrations in Eucalyptus leaves by X-ray fluorescence (mu-XRF) and absorption near-edge spectroscopy (mu-XANES). Eucalyptus tereticornis is a tree species with great economic value and potential to accumulate and tolerate high Mn despite not being considered a hyperaccumulator. Seedlings grown under glasshouse conditions were irrigated with two Mn treatments: control Mn (9 mu M) and high Mn solution (1000 mu M). Biomass and total nutrient concentrations were assessed in roots, stems and leaves. Manganese, calcium (Ca) and potassium (K) spatial patterns were imaged by mu-SXRF in different foliar structures, and Mn speciation was conducted in these compartment... mais Periódico: Journal of Hazardous Materials Instalação: CARNAUBA Laboratório: LNLS Tipo: Artigo em Periódico Indexado Agência de fomento: CNPq - 303664/2020–7, CNPq - 306002/2020–5, FAPESP - 2016/25498–0, FAPESP - 2019/10243–4 Complemento: v. 461, p. 132555, 2024 Autores: Oliveira, V. H. de Mazzafera, P.Faleiro, R. Mayer, J. L. S.Hesterberg, D. Pérez, C. A. Andrade, S. A. L. DOI: 10.1016/j.jhazmat.2023.132555 Health, Toxicology and MutagenesisPollutionWaste Management and DisposalEnvironmental ChemistryEnvironmental EngineeringHeavy metal localisationMetal tolerancePhytotoxicitySynchrotron radiationRAY-ABSORPTION SPECTROSCOPYHEAVY-METALSSOIL FERTILITYTOXICITYACCUMULATIONSENSITIVITYELEMENTLEAVESALLEVIATIONTOLERANCE PLQ-sim: A computational tool for simulating photoluminescence quenching dynamics in organic donor/acceptor blends 2024 Resumo: Photoluminescence Quenching Simulator (PLQ-Sim) is a user-friendly software to study the photoexcited state dynamics at the interface between two organic semiconductors forming a blend: an electron donor (D), and an electron acceptor (A). Its main function is to provide substantial information on the photophysical processes relevant to organic photovoltaic and photothermal devices, such as charge transfer state formation and subsequent free charge generation or exciton recombination. From input parameters provided by the user, the program calculates the transfer rates of the D/A blend and employs a kinetic model that provides the photoluminescence quenching efficiency for initial excitation in the donor or acceptor. When calculating the rates, the user can choose to use disorder parameters... mais Periódico: Computer Physics Communications Instalação: LNNano Laboratório: LNNano Tipo: Artigo em Periódico Indexado Agência de fomento: FAPERJ - E-26/200.627/2022, FAPERJ - E-26/200.729/2023, FAPERJ - E-26/202.091/2022, FAPERJ - E-26/210.391/2022 Complemento: v. 296, p. 109015, 2024 Autores: Benatto, L. Mesquita, O. Roman, L. S.Capaz, R. B. Candiotto, G.Koehler, M. DOI: 10.1016/j.cpc.2023.109015 General Physics and AstronomyHardware and ArchitecturePhotoluminescence quenchingSoftwareOrganic semiconductorCharge transferEnergy transferExcitonEXCITON BINDING-ENERGIESSOLAR-CELLSCHARGE-TRANSPORTEFFICIENCYACCEPTORSEPARATIONPOLYMERDONORGENERATIONRECOMBINATION Tuning Phase Purity in Chiral 2D Perovskites 2024 Resumo: The introduction of chiral organic spacers in low-dimensional metal-halide perovskites triggers chiroptical activity, which is appealing for spintronic applications. However, a comprehensive understanding of structure formation and the ability to control phase purity in such materials have yet to be developed. Herein, the impact of processing conditions on the phase purity, microstructure, and chiroptical properties of chiral 2D perovskites is explored. The anisotropic emergence of a 1D perovskite inside the 2D matrix and its dependence on the organic cation chirality, solvent, and thermal annealing conditions are shown. By controlling these parameters, the in-plane conductivity of the films is nearly doubled. Furthermore, it is demonstrated, for the first time, that solvent choice and the... mais Periódico: Advanced Optical Materials Instalação: CEDRO Laboratório: LNLS Tipo: Artigo em Periódico Indexado Agência de fomento: CNPq - Não consta, FAPESP - 2014/25770-6, FAPESP - 2017/119865 , FAPESP - 2018/016695, FAPESP - 2018/21401-7, FAPESP - 2020/04406-5 , FAPESP - 2021/01357-6 , FAPESP - 2021/12104-1 Complemento: v.12, n.2, p.2300776, 2024 Autores: Scalon, L.Brunner, J. Guaita, M. G. D. Szostak, R. Albaladejo-Siguan, M. Kodalle, T. Guerrero-León, L. A. Fellah, C. Oliveira, C. C. Vaynzof, Y. Nogueira, A. F. DOI: 10.1002/adom.202300776 Anexos Atomic and Molecular Physics, and OpticsElectronic, Optical and Magnetic MaterialsPOLARIZED LIGHT DETECTIONLEAD HALIDE PEROVSKITESEXCITON BINDING-ENERGYCIRCULAR-DICHROISMHYBRID PEROVSKITEOPTICAL-PROPERTIESCRYSTAL-STRUCTURESSOLAR-CELLSSTRAINSTABILITY Charge dynamics in semiconductors for photoelectrochemical water splitting 2024 Resumo: This letter focuses on monitoring alterations in the charge carrier dynamics associated with in-situ modifications into hematite photoanodes, employing advanced electrochemical techniques. A simple and scalable polymeric precursor solution, deposited by spin-coating, was employed to synthesize hematite based photoanodes. Among various modifications, Tantalum (Ta+5) shows the most promising results, yielding a hydrogen production rate of 24.0 mu mol cm-2h-1 at 1.23VRHE. This is attributed to Ta5+ segregation at hematite grain surface, which facilitates the charge transport efficiency and leads to higher external quantum efficiency. Conversely, sodium (Na+) primarily increases the film thickness with limited observable effects on charge carrier dynamics, while zinc (Zn+2) adversely affects h... mais Periódico: Materials Letters Instalação: LNNano Laboratório: LNNano Tipo: Artigo em Periódico Indexado Agência de fomento: CAPES - Não consta, CNPq - Não consta, FAPESP - 17/02317-2, FAPESP - 17/11986-5 Complemento: v. 357, p. 135781, 2024 Autores: Santos, A. M. S. dos Rodríguez-Gutiérrez, I. Morishita, G. M. Silva, R. M. L. Souza, F. L. de DOI: 10.1016/j.matlet.2023.135781 Mechanical EngineeringMechanics of MaterialsCondensed Matter PhysicsGeneral Materials ScienceHematiteIn-situ modificationsIMPSCharge carrier dynamics Combined toxicity of fluorescent silica nanoparticles with cadmium in Ceriodaphnia dubia: Interactive effects of natural organic matter and green algae feeding 2024 Resumo: The environmental risks of silica nanoparticles (SiNP) reported in the literature are contradictory and bring into question its safety for use in consumer applications. Organisms are never exposed to NPs alone in the real environment, while studies of the combined toxicity of SiNP are limited. To address this, we compared the acute toxicity of fluorescent core-shell SiNPs alone and in mixtures with Cd2+ to Ceriodaphnia dubia in the absence and presence of NOM. We identified biodistribution and feeding behaviour in addition to the traditional endpoints. NOM increased the colloidal stability of SiNPs in reconstituted water. In immobility tests, no significant effects were observed from Cd2+ exposure with NOM and varying concentrations of SiNPs. A similar pattern of curve dose-response was ob... mais Periódico: Journal of Hazardous Materials Instalação: ILUM,Nanotox,TEM Laboratório: Ilum,LNNano Tipo: Artigo em Periódico Indexado Agência de fomento: CNPq - 315575/2020–4, FAPESP - 18/25140–3, FAPESP - 19/07058–0 Complemento: v. 461, p. 132623, 2024 Autores: Maia, M. T. Delite, F. de S. Silva, G. H. da Ellis, L.- J. A. Papadiamantis, A. G. Paula, A. J. de Lynch, I.Martinez, D. S. T. DOI: 10.1016/j.jhazmat.2023.132623 Health, Toxicology and MutagenesisPollutionWaste Management and DisposalEnvironmental ChemistryEnvironmental EngineeringTITANIUM-DIOXIDE NANOPARTICLESDAPHNIA-MAGNAJOINT TOXICITYHUMIC-ACIDNANOMATERIALSEXPOSURESZINCBIOAVAILABILITYACCUMULATIONSTABILITY Nanostructured FTO/Zr-hematite interfaces for solar water-splitting applications 2024 Resumo: Production of green hydrogen via photoelectrochemical (PEC) processes is strategic to store and distribute solar-harvested energy. Hematite (alpha-Fe2O3) is a promising photoactive photoanode material candidate for PEC applications, but its synthesis as a photoanode thin film needs improvements to optimize the PEC device's per-formance. We have previously explored a new strategy consisting of the use of Zr4+ as a surfactant (Zr-hematite) and Ni2+ as a co-catalyst element in the synthesis of hematite photoanode thin films deposited onto a fluorine-doped tin oxide (FTO) on a glass substrate, obtaining a significant enhancement of device performance. In this work, we demonstrated how the interface and surface conditions are affected by the incorporation of Zr4+ and Ni2+. Chemical mapping pe... mais Periódico: Applied Surface Science Instalação: SEM Laboratório: LNNano Tipo: Artigo em Periódico Indexado Agência de fomento: CAPES - 88882.438914/2019-01, CNPq - 315350/2020-2, CNPq - 315669/2021-07, FAPESP - 17/11986-5, FAPESP - 19/06654-9, FAPESP - 21/07459-5, FAPESP - 21/10672-2 Complemento: v. 645, p. 158867, 2024 Autores: Santos, G. T. dos Bedin, K. C. Fiuza, T. E. R. Rodríguez-Gutiérrez, I. Fichtner, P. F. P.Souza, F. L. de Bettini, J. DOI: 10.1016/j.apsusc.2023.158867 Surfaces, Coatings and FilmsCondensed Matter PhysicsSurfaces and InterfacesGeneral Physics and AstronomyGeneral ChemistryWater-SplittingSurface electronic reductionInterface EngineeringStrain at interfaceEELS-EDS mappingENERGY-LOSS SPECTROSCOPYDOPED HEMATITESURFACE MODIFICATIONSTRAIN RELAXATIONPHOTOANODESOXIDATIONLAYERSSTATEEELS 12345 FILTROS AVANÇADOS (clique em pesquisar para aplicar) DOI Título Palavras-chave * Tipo de trabalho * Artigo em Periódico Indexado [3872] Ano de publicação * 2024 [16] * 2023 [251] * 2022 [246] * 2021 [266] * 2020 [290] * 2019 [332] * 2018 [313] * 2017 [290] * 2016 [247] * 2015 [211] * 2014 [190] * 2013 [196] * 2012 [101] * 2011 [125] * 2010 [102] Autor * Tolentino, H. C. N. [73] * Ramos, A. Y. [52] * Alves, M. C. M. [29] * Watanabe, N. [09] * Cezar, J. C. [43] * Vicentin, F. C. [28] * Pérez, C. A. [84] * Tamura, E. [09] * Knobel, M. [45] * Barrea, R. A. [17] * Ugarte, D. M. [58] * Zanchet, D. [55] * Hall, B. D. [02] * Teixeira, S. R. [15] * Cunha, J. B. M. [04] Agência de fomento * ANP [04] * ANPCyT [03] * BNDES [04] * BUTANTAN [01] * CAPES [1213] * CEPROCOR [02] * CLAF [03] * CNPq [2293] * CONICET [01] * FACEPE [21] * FAEPEX [07] * FAPDF [12] * FAPDF [02] * FAPEAL [05] * FAPEAM [09] Laboratório * Ilum - Ilum [43] * LNBio - Laboratório Nacional de Biociências [807] * LNBR - Laboratório Nacional de Biorrenováveis [837] * LNLS - Laboratório Nacional de Luz Síncrotron [1642] * LNNano - Laboratório Nacional de Nanotecnologia [1109] Instalação * AFM [73] * AFM-IR [04] * AFM1 [01] * BBE [01] * BPC [03] * BVC [30] * CARACTERIZAÇÃO [02] * CARNAUBA [14] * CATERETÊ [02] * CeBiME [111] * CEDRO [01] * CME [01] * CPM [07] * CRYO-TEM-FT [11] * CTBE [537] Periódico * 2D Materials [06] * 3 BIOTECH [02] * ACS Agricultural Science & Technology [01] * ACS Applied Bio Materials [06] * ACS Applied Electronic Materials [01] * ACS Applied Energy Materials [05] * ACS Applied Materials & Interfaces [30] * ACS Applied Nano Materials [12] * ACS Applied Polymer Materials [02] * ACS Catalysis [06] * ACS Chemical Biology [01] * ACS Chemical Neuroscience [01] * ACS Infectious Diseases [02] * ACS Macro Letters [02] * ACS Medicinal Chemistry Letters [02]