Chemistry, Materials Chemistry, Colloid and Surface Chemistry
14
Scopus Publications
323
Scholar Citations
10
Scholar h-index
12
Scholar i10-index
Scopus Publications
Wet-chemistry synthesis of ultrasmall α-MoC1-x nanoparticles and rGO/α-MoC1-x composite and its evaluation as electrocatalysts for hydrogen evolution reaction Derik T. Machado, Daniel A. Moraes, Natália M. Santos, Felipe B. Ometto, Edson A. Ticianelli, Laudemir C. Varanda Materials Research Bulletin, 2024 Ultrasmall molybdenum carbide α − MoC 1 − x nanoparticles (1.6 nm) and the hybrid material rGO/ α − MoC 1 − x supported in reduced graphene oxide (rGO) were synthesized by a one-pot oleylamine-mediated route at low-temperature (613 K). They were evaluated as electrocatalysts for the hydrogen evolution reaction (HER) in the acid medium after surface cleaning with an ethanol-acetic acid solution. The electrocatalysts were also thermal treated ( N 2 flow, 773 K/30 min) and compared with untreated ones. Quite large HER activity was observed for the α − MoC 1 − x compared with the rGO/ α − MoC 1 − x and rGO/ α − MoC 1 − x − 773 . In addition, after cycling, all catalysts showed considerable performance improvement assigned to removing residual oleylamine molecules from the electrocatalyst’s surface. Compared to the unsupported sample, the lower catalytic activity in the supported materials was attributed to the ultrasmall carbide nanoparticles oxidation increases. The route is simple, with low costs and energy consumption, showing a high potential to develop efficient electrocatalysts for HER.
Acid selenites as new selenium precursor for CdSe quantum dot synthesis João B. Souza Junior, Beatriz Mouriño, Marcelo H. Gehlen, Daniel A. Moraes, Jefferson Bettini, Laudemir C. Varanda Heliyon, 2024 H NMR confirming their structures. This unprecedented precursor generates high-quality CdSe nanocrystals with narrow size distribution in the zinc-blend structure showing controlled optical properties. Advanced characterization detailed the CdSe structure showing stacking fault defects and its dependence on the used R-O-SeOOH. The QDs formation was examined using a time-dependent growth kinetics model. Differences in the nanoparticle surface structure influenced the optical properties, and they were correlated to the Se-precursor nature. Small alkyl chain acid selenites generally lead to more controlled QDs morphology, while the bigger alkyl chain leads to slightly upper quantum yields. Acid selenites can potentially replace Se-precursors at competitive costs in the metallic chalcogenide nanoparticles. Image 1 is chemically stable, and alcohols are cheap and less toxic than the reactants used today, making acid selenites a more sustainable Se precursor.
Electrospun Composite Bead-on-String Nanofibers Containing CaO2Nanoparticles and MnO2Nanosheets as Oxygen-Release Systems for Biomedical Applications Danilo M. dos Santos, Luana M. Dias, Amanda K. Surur, Daniel A. de Moraes, Ana C. Pavarina, Carla R. Fontana, Daniel S. Correa ACS Applied Nano Materials, 2022 Oxygen-generating biomaterials have the potential to improve tissue engineering and regenerative therapeutic strategies. However, the development of such materials capable of controlling the local partial pressure of oxygen (pO2) in the long term is still a major challenge. Here we report nanostructured composite membranes comprising electrospun fibers exhibiting a bead-on-string structure as a controlled oxygen-release system for periodontitis treatment. For this, calcium peroxide nanoparticles (CaO2 NPs) and manganese dioxide nanosheets (MnO2 NSs) were incorporated into the structure of hydrophobic electrospun poly (lactic acid) (PLA)-based nanofibers. We use CaO2 NPs as hydrogen peroxide (H2O2)-generating precursors when exposed to water, while MnO2 NSs were applied as a nanozyme to catalyze the decomposition of H2O2 to the final oxygen product. Our results revealed that the beads on the fibrous structure acted as reservoirs of CaO2 NPs and MnO2 NSs. Moreover, the composite membranes provided sustained oxygen release over 7 days, where levels were modulated by the CaO2 NP content. Such constructs exhibited suitable physicochemical properties and antimicrobial activities against some bacteria (e.g., Porphyromonas gingivalis and Treponema denticola) typically associated with aggressive and chronic periodontitis. In vitro studies also revealed that the membranes were not cytotoxic toward human oral keratinocyte (Nok-si) cells as well as enhanced the cell viability when high content of CaO2 NP and MnO2 NS were incorporated into the fiber’s structure. Taken together, our results demonstrate that the nanostructured composite membranes show potential to be employed as oxygen-release platforms for periodontal tissue regeneration.
Ultrasmall Superparamagnetic Iron Oxide Nanoparticles Synthesized by Micellar Approach as a Potential Dual-Mode T1-T2 Contrast Agent Laudemir C. Varanda, Watson Beck, Simone J.S. Lopes, Daniel A. Moraes, Natalia M. Santos, Maria Eduarda S. D. Lino Current Nanomedicine, 2022 Purpose: A micellar approach is used to synthesize Ultrasmall Superparamagnetic Iron Oxide Nanoparticles (USPIONs) with an average diameter of 3.4±0.5 nm, suitable for dual-mode T1-T2 contrast agents. Methods: Micelles with 3.8 nm, measured by dynamic light scattering, were obtained by self-organizing the surfactant iron(III) dodecyl sulfate (IDS) in 1-octanol. IDS was prepared by replac-ing Na+ cation in sodium dodecyl sulfate molecule, and its critical micelle concentration (CMC) was measured by electrical conductivity. The USPIONs were synthesized in a biphasic system: IDS in octanol (55% above the CMC) and water containing NaBH4. Results: A yellow precipitate is immediately formed at the water/alcohol interface, rapidly changes to a black one, and transfers to the aqueous phase. The magnetite phase was confirmed by X-ray diffraction and Mössbauer spectroscopy. The magnetic behavior shows a major paramagnetic char-acter with a weak ferromagnetic component at 5 K, the latter attributed to the interparticle couplings below its blocking temperature (TB = 35 K). The particles were coated with carboxymethyl dextran, showing an isoelectric point of 2.7 with electrokinetic potential around -30 mV in the physiological pH range. Magnetic relaxation measurements showed relaxivity values r1 = 0.17 mM-1 s-1 and r2 = 1.73 mM-1 s-1 (r2/r1 = 10) in a 3T field. These values infer that the ultrasmall size affects the interac-tions with the protons of the nearby water molecules. The r2 value decreases because the core mag-netization decreases with size; r1 intensifies due to the high surface. Conclusion: The results show a system with high colloidal stability, non-cytotoxic, and potential application as T1-T2 dual-mode contrast agents.
Gold nanowire growth through stacking fault mechanism by oleylamine-mediated synthesis Daniel A. Moraes, João B. Souza Junior, Fabio F. Ferreira, Naga Vishnu V. Mogili, Laudemir C. Varanda Nanoscale, 2020 We assigned the growth mechanism of anisotropic tadpole-like gold nanowires to the stable stacking faults and twinned defect formation, with Au-monomer incorporation onto the faulted-faces, resulting in a tail with a mixture of fcc/hcp phases.
Paper-based microfluidics immunoassay for detection of canine distemper virus Thiago Mazzu-Nascimento, Fabiana Cristina Donofrio, Beatriz Cutilak Bianchi, Regiane de Fátima Travensolo, João Batista Souza Junior, Daniel Angeli Moraes, Giorgio Gianini Morbioli, Thiago Pinotti Segato, Laudemir Carlos Varanda, Emanuel Carrilho Brazilian Archives of Biology and Technology, 2017
RECENT SCHOLAR PUBLICATIONS
Biological synthesis of gold nanoparticles by endophytic bacterium Priestia megaterium (CBMAI 2841) and their application as a catalyst in Knoevenagel reaction JG Viana, DA Moraes, LA Calixto, DEQ Jimenez, ALM Porto, LC Varanda Molecular Catalysis 585, 115303 , 2025 2025 Citations: 3
Platinum selenide nanoparticle synthesis and reaction with butyllithium breaking the long-range ordering structure VS Lemos, D Angeli de Moraes, I de Lacerda Pataca, OF Verruma, ... Chemistry of Materials 36 (18), 8613-8622 , 2024 2024 Citations: 4
Wet-chemistry synthesis of ultrasmall α-MoC1-x nanoparticles and rGO/α-MoC1-x composite and its evaluation as electrocatalysts for hydrogen evolution reaction DT Machado, DA Moraes, NM Santos, FB Ometto, EA Ticianelli, ... Materials Research Bulletin 174, 112737 , 2024 2024 Citations: 4
Cellulose esters: Synthesis for further formation of films with magnetite nanoparticles incorporated DMF Sandrini, DL Morgado, AJA de Oliveira, DA de Moraes, LC Varanda, ... International Journal of Biological Macromolecules 264, 130594 , 2024 2024 Citations: 10
Acid selenites as new selenium precursor for CdSe quantum dot synthesis JBS Junior, B Mouriño, MH Gehlen, DA Moraes, J Bettini, LC Varanda Heliyon 10 (1) , 2024 2024 Citations: 4
Enhanced Luminescence Lateral-flow Assay (ELLA) for Urinary Biomarker Monitoring MS Arai, H Kim, B Cha, M Pascavis, GV Brambilla, YK Cho, J Park, ... 22. B-MRS meeting 2024 , 2024 2024
Supported Cu catalysts on UiO-66 toward enhanced methanol selectivity by CO2 hydrogenation: Effect of Cu loading FCF Marcos, MJF Costa, GL Catuzo, DA de Moraes, M de Oliveira Junior, ... Journal of Catalysis 427, 115104 , 2023 2023 Citations: 18
Highly efficient detection of ethanol by SnO2 nanoparticles-decored NiO nanocuboids OM Perrone, AC Roveda Jr, DA de Moraes, R dos Santos Theodoro, ... Materials Research Bulletin 158, 112086 , 2023 2023 Citations: 11
The enhanced n-butanol sensing performance of In2O3 loaded NiO cuboid heterostructure OM Perrone, AC Roveda Jr, DA de Moraes, DP Volanti Journal of Alloys and Compounds 930, 167483 , 2023 2023 Citations: 28
Raman spectroscopy studies of PtSe2 and the formation of selenium vacancies using temperature CP Torres, DA Moraes, IL Pataca, JSJ Batista, ER Leite Proceedings of the 21. Brazil MRS Meeting, 1765-1765 , 2023 2023
Study of interparticle magnetic coupling by DPC-STEMof self-and magnetic-induced assemblies of Fe3O4 nanocrystals DA Moraes, AL Nunes, NVV Mogili, CAO Ramirez, OF Verruma, ... Proceedings , 2023 2023
Synthesis of stable and lead-free all-inorganic metal halide perovskites SO Romera, DA Moraes, LC Varanda Anais , 2023 2023
Effect of silver nanoparticles on the visible upconversion emission of Er3+/Yb3+ co-doped SbPO4-GeO2 glasses RG Capelo, TI Rubio, GL Calderón, DA de Moraes, EM Junior, M Nalin, ... Optical Materials 135, 113234 , 2023 2023 Citations: 10
Electrospun Composite Bead-on-String Nanofibers Containing CaO 2 Nanoparticles and MnO 2 Nanosheets as Oxygen-Release Systems for Biomedical … DM Dos Santos, LM Dias, AK Surur, DA De Moraes, AC Pavarina, ... ACS Applied Nano Materials 5 (10), 14425-14436 , 2022 2022 Citations: 27
Metallic nanoparticle contamination from environmental atmospheric particulate matter in the last slab of the trophic chain: Nanocrystallography, subcellular localization and … IC Souza, M Morozesk, P Siqueira, E Zini, IN Galter, DA de Moraes, ... Science of The Total Environment 814, 152685 , 2022 2022 Citations: 20
Ultrasmall superparamagnetic iron oxide nanoparticles synthesized by micellar approach as a potential dual-mode T1-T2 contrast agent W Beck, LC Varanda, SJS Lopes, DA Moraes, NM Santos, ME SD Lino Current Nanomedicine (Formerly: Recent Patents on Nanomedicine) 12 (1), 63-75 , 2022 2022 Citations: 8
Biossíntese de nanopartículas de ouro pela bactéria endofítica Bacillus sp. da flor de lavandin e aplicação em reações de Knoevenagel JG Viana, LA Calixto, MFF Luis, DA Moraes, LC Varanda, DEQ Jimenez, ... Libro de resúmenes , 2022 2022
Caracterização de perovskitas duplas CsAgBiBr6 e substituição de agentes de superfícies das nanopartículas DY Brasilino, DA Moraes, D Manzani, LC Varanda Resumos , 2022 2022
Síntese de perovskitas de haletos de metal totalmente inorgânicas estáveis e livres de chumbo SO Romera, DA Moraes, LC Varanda Resumos , 2022 2022
Pesquisadores criam nova metodologia para produzir nanofios de ouro DA Moares, LC Varanda, JB Souza Junior Conselho Federal de Química , 2020 2020
MOST CITED SCHOLAR PUBLICATIONS
Size and shape-controlled nanomaterials based on modified polyol and thermal decomposition approaches. A brief review. LC Varanda, CGS Souza, DA Moraes, HR Neves, JB Souza Junior, ... Anais da Academia Brasileira de Ciências 91, e20181180 , 2019 2019 Citations: 66
Sisal cellulose and magnetite nanoparticles: Formation and properties of magnetic hybrid films DM Furlan, DL Morgado, AJA de Oliveira, ÂD Faceto, DA de Moraes, ... Journal of Materials Research and Technology 8 (2), 2170-2179 , 2019 2019 Citations: 48
The enhanced n-butanol sensing performance of In2O3 loaded NiO cuboid heterostructure OM Perrone, AC Roveda Jr, DA de Moraes, DP Volanti Journal of Alloys and Compounds 930, 167483 , 2023 2023 Citations: 28
Electrospun Composite Bead-on-String Nanofibers Containing CaO 2 Nanoparticles and MnO 2 Nanosheets as Oxygen-Release Systems for Biomedical … DM Dos Santos, LM Dias, AK Surur, DA De Moraes, AC Pavarina, ... ACS Applied Nano Materials 5 (10), 14425-14436 , 2022 2022 Citations: 27
Metallic nanoparticle contamination from environmental atmospheric particulate matter in the last slab of the trophic chain: Nanocrystallography, subcellular localization and … IC Souza, M Morozesk, P Siqueira, E Zini, IN Galter, DA de Moraes, ... Science of The Total Environment 814, 152685 , 2022 2022 Citations: 20
Gold nanowire growth through stacking fault mechanism by oleylamine-mediated synthesis DA Moraes, JBS Junior, FF Ferreira, NVV Mogili, LC Varanda Nanoscale 12 (25), 13316-13329 , 2020 2020 Citations: 20
Inorganic and organic–inorganic composite nanoparticles with potential biomedical applications: synthesis challenges for enhanced performance LC Varanda, CGS de Souza, CJ Perecin, DA de Moraes, DF de Queiróz, ... Materials for Biomedical Engineering, 47-99 , 2019 2019 Citations: 20
Supported Cu catalysts on UiO-66 toward enhanced methanol selectivity by CO2 hydrogenation: Effect of Cu loading FCF Marcos, MJF Costa, GL Catuzo, DA de Moraes, M de Oliveira Junior, ... Journal of Catalysis 427, 115104 , 2023 2023 Citations: 18
based microfluidics immunoassay for detection of Canine Distemper Virus T Mazzu-Nascimento, FC Donofrio, BC Bianchi, RF Travensolo, JB Souza, ... Brazilian Archives of Biology and Technology 60 , 2017 2017 Citations: 13
Highly efficient detection of ethanol by SnO2 nanoparticles-decored NiO nanocuboids OM Perrone, AC Roveda Jr, DA de Moraes, R dos Santos Theodoro, ... Materials Research Bulletin 158, 112086 , 2023 2023 Citations: 11
Cellulose esters: Synthesis for further formation of films with magnetite nanoparticles incorporated DMF Sandrini, DL Morgado, AJA de Oliveira, DA de Moraes, LC Varanda, ... International Journal of Biological Macromolecules 264, 130594 , 2024 2024 Citations: 10
Effect of silver nanoparticles on the visible upconversion emission of Er3+/Yb3+ co-doped SbPO4-GeO2 glasses RG Capelo, TI Rubio, GL Calderón, DA de Moraes, EM Junior, M Nalin, ... Optical Materials 135, 113234 , 2023 2023 Citations: 10
Ultrasmall superparamagnetic iron oxide nanoparticles synthesized by micellar approach as a potential dual-mode T1-T2 contrast agent W Beck, LC Varanda, SJS Lopes, DA Moraes, NM Santos, ME SD Lino Current Nanomedicine (Formerly: Recent Patents on Nanomedicine) 12 (1), 63-75 , 2022 2022 Citations: 8
Preparation of poly (3-hydroxybutyrate) micro-and nanoparticles as hydrophobic drugs carrier using self-emulsifying nanoemulsion method RA Bini, DA Moraes, LC Varanda Brit J Pharm Res 12, 28070 , 2016 2016 Citations: 6
Platinum selenide nanoparticle synthesis and reaction with butyllithium breaking the long-range ordering structure VS Lemos, D Angeli de Moraes, I de Lacerda Pataca, OF Verruma, ... Chemistry of Materials 36 (18), 8613-8622 , 2024 2024 Citations: 4
Wet-chemistry synthesis of ultrasmall α-MoC1-x nanoparticles and rGO/α-MoC1-x composite and its evaluation as electrocatalysts for hydrogen evolution reaction DT Machado, DA Moraes, NM Santos, FB Ometto, EA Ticianelli, ... Materials Research Bulletin 174, 112737 , 2024 2024 Citations: 4
Acid selenites as new selenium precursor for CdSe quantum dot synthesis JBS Junior, B Mouriño, MH Gehlen, DA Moraes, J Bettini, LC Varanda Heliyon 10 (1) , 2024 2024 Citations: 4
Biological synthesis of gold nanoparticles by endophytic bacterium Priestia megaterium (CBMAI 2841) and their application as a catalyst in Knoevenagel reaction JG Viana, DA Moraes, LA Calixto, DEQ Jimenez, ALM Porto, LC Varanda Molecular Catalysis 585, 115303 , 2025 2025 Citations: 3
Nanopartículas magnéticas decoradas com nanopartículas metálicas visando aplicações em biomedicina. 2012. 69 f DA MORAES Dissertação (Mestrado em Ciências)-Instituto de Química de São Carlos … , 2012 2012 Citations: 3
Enhanced Luminescence Lateral-flow Assay (ELLA) for Urinary Biomarker Monitoring MS Arai, H Kim, B Cha, M Pascavis, GV Brambilla, YK Cho, J Park, ... 22. B-MRS meeting 2024 , 2024 2024
