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Datos de Investigación

Permanent URI for this collectionhttps://docta.ucm.es/handle/20.500.14352/16

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    Data: Role of anodic precursor layer thickness on PEO coatings: energy consumption and long-term corrosion performance
    (2024) Muhammad Ahsan Iqbal; Matykina, Endzhe; Arrabal Durán, Raúl; Mohedano Sánchez, Marta
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    GTFS Madrid Dataset & Metadata
    (2025) Consorcio de Transportes de Madrid
    Los datos GTFS del Consorcio Regional de Transportes de Madrid constituyen un conjunto estructurado de información sobre la red de transporte público, incluyendo horarios, rutas, paradas, frecuencias y correspondencias. Este formato estandarizado permite la integración con aplicaciones de movilidad y análisis de accesibilidad, facilitando el tratamiento automatizado y la interoperabilidad con otros sistemas de información geográfica o de planificación urbana.
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    GTFS Curitiba Dataset & Metadata
    (2017) Prefeitura Municipal de Curitiba
    Los datos GTFS de la ciudad de Curitiba recogen información detallada sobre la red de transporte público urbano, incluyendo rutas, paradas, horarios y frecuencias de paso. Este conjunto de datos, estructurado según el formato estándar GTFS, permite su uso en aplicaciones de planificación de movilidad, análisis espacial y estudios comparativos sobre accesibilidad y eficiencia del transporte.
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    Metadata for GPT Dataset
    (2025) Santiago-Iglesias, Enrique
    Metadata for the Google Popular Times dataset. Access to the data requires a formal request.
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    Influence of excitation pulse duration on the efficiency of upconversion nanoparticle-based FRET
    (2025) Casillas-Rubio, Alejandro; Hamraoui, Khouloud; Méndez González, Diego; Laurenti, Marco; Rubio Retama, Benito Jorge; Gómez Calderón, Óscar; Melle Hernández, Sonia
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    Data: Biological Performance of Duplex PEO + CNT/PCL Coating on AZ31B Mg Alloy for Orthopedic and Dental Applications
    (2023) Daavari, Morteza; Atapour, Masoud; Mohedano Sánchez, Marta; Matykina, Endzhe; Arrabal Durán, Raúl; Nesic, Dobrila
    To regulate the degradation rate and improve the surface biocompatibility of the AZ31B magnesium alloy, three different coating systems were produced via plasma electrolytic oxidation (PEO): simple PEO, PEO incorporating multi-walled carbon nanotubes (PEO + CNT), and a duplex coating that included a polycaprolactone top layer (PEO + CNT/PCL). Surfaces were characterized by chemical content, roughness, topography, and wettability. Biological properties analysis included cell metabolism and adhesion. PEO ± CNT resulted in an augmented surface roughness compared with the base material (BM), while PCL deposition produced the smoothest surface. All surfaces had a contact angle below 90°. The exposure of gFib-TERT and bmMSC to culture media collected after 3 or 24 h did not affect their metabolism. A decrease in metabolic activity of 9% and 14% for bmMSC and of 14% and 29% for gFib-TERT was observed after 3 and 7 days, respectively. All cells died after 7 days of exposure to BM and after 15 days of exposure to coated surfaces. Saos-2 and gFib-TERT adhered poorly to BM, in contrast to bmMSC. All cells on PEO anchored into the pores with filopodia, exhibited tiny adhesion protrusions on PEO + CNT, and presented a web-like spreading with lamellipodia on PEO + CNT/PCL. The smooth and homogenous surface of the duplex PEO + CNT/PCL coating decreased magnesium corrosion and led to better biological functionality.
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    Data: Development of a modified-in vitro corrosion fatigue test rig for biodegradable load-bearing metallic implants
    (2025) Daavari, Morteza; Shooshtarian, Mohammadreza; Esmailzadeh, Mojtaba; Atapour, Masoud; Hajihoseini, Samaneh; Blawert, Carsten; Mohedano Sánchez, Marta; Matykina, Endzhe; Arrabal Durán, Raúl
    Corrosion fatigue is a major factor leading to sudden failures in load-bearing orthopaedic implants, particularly in biodegradable ones that corrode more quickly than permanent implants. In the current study, we developed a novel modified-in vitro corrosion fatigue (MICorF) rig that incorporates several key parameters—such as loading mode, blood buffering capacity, gradual bone healing processes, and the synchronization of corrosion and cyclic damage—aimed at closely mimicking in vivo conditions. The functionality of the MICorF was tested with an experimental extruded ZX00 (Mg-0.5Zn-0.5Ca) Mg alloy. The results showed that the ZX00 Mg alloy possesses a limited biomechanical performance. Based on the SEM micrographs, the presence of intermetallic particles in the alloy microstructure and the subsequent galvanic corrosion phenomena could be taken as the main cause of failure. According to the results yielded by the MICorF, the ZX00 alloy withstands at least 20 days under the studied physiological conditions and polarization corresponding to the pitting conditions.
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    Alterations in neuroinflammation, microglia and neuroplasticity in the rat hippocampus in a combined model of periodontitis and depression. Dataset
    (2025) Robledo Montaña, Javier; Martín-Hernández, David; Cuenca-Ortega, Javier; Martínez, María; Virto Ruiz, Leire; Ambrosio Elejalde, Nagore; Montero Solís, Eduardo; Marín Cuenda, María José; Herrera González, David; Leza Cerro, Juan Carlos; Figuero Ruiz, Elena; García Bueno, Borja
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    Project "From multivalency in molecules to nanomaterials organization: chemical modification strategies in fullerenes and carbon dots for biological and (bio)sensing applications" (ORCHESTRACA) Research Data Collection
    (2025) Herranz Astudillo, María Ángeles; Illescas Martínez, Beatriz María; Martín Doménech, Ángel; Rodríguez Pérez, Laura; Cabrera González, Justo Enrique
    This open access database compiles the research data from the ORCHESTRACA project funded by the Spanish Ministry of Science and Innovation (Title “From multivalency in molecules to nanomaterials organization: chemical modification strategies in fullerenes and carbon dots for biological and (bio)sensing applications”, Reference PID2020-115120GB-I00, from 01/09/2021 to 28/02/2025). The collected datasets are organized according to the main research outcomes achieved and include, among others, experimental and computational protocol data, equipment data, structural characterization data (e.g., ¹H and ¹³C NMR spectra, FTIR data, HRMS data, Raman, DLS, and XPS of relevant compounds), microscopic characterization (TEM, AFM), UV-Vis-NIR spectroscopic data (e.g., steady-state absorption and emission spectra, time-delayed emission spectra, nanosecond and microsecond transient absorption spectra, and circular dichroism (CD) spectra, of relevant compounds in different media, concentrations and irradiation conditions), photophysical data (e.g., UV-Vis absorption, fluorescence, phosphorescence, and laser emission wavelengths, molar absorption coefficients, fluorescence and singlet oxygen quantum yields, fluorescence lifetimes, radiative and non-radiative deactivation rate constants of relevant compounds in different media, concentrations and irradiation conditions, along with detailed information on the spectroscopic techniques used), quantum mechanical calculation data (e.g., computed molecular geometries and energies in the ground and excited states, electronic density maps of frontier orbitals, charge distribution maps, along with detailed information on the software and computational clusters used), and biological and biophotophysical data (e.g., cell uptake data, cell viability data under dark and non-dark conditions, confocal fluorescence microscopy, transinfection experiments, SPR binding studies, quartz crystal microbalance determination of association constants, and bioimaging behavior).
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    A scalable approach for tailoring silica shells: from synthesis to stability of upconversion nanoparticles. DATASET
    (2025) Alarcón-Fernández Carlos; Cascales Concepción; Méndez González, Diego; Zabala Gutiérrez, Irene; Melle Hernández, Sonia; Gómez Calderón, Óscar; Laurenti, Marco
    This dataset contains the experimental procedures, characterization data, and validation results for the surface functionalization of silica-coated upconversion nanoparticles (UCNPs@SiO₂) used in the publication A scalable approach for tailoring silica shells: from synthesis to stability of upconversion nanoparticles.
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    BIOMOPRO Research Data Collection
    (2025) García-Moreno, Inmaculada; Moya Cerero, Santiago de la; Ortiz García, María Josefa; Bañuelos, Jorge
    This open access database compiles the research data from the BIOMOPRO coordinated project, funded by the Spanish Ministry of Science and Innovation (Title “Molecular probes engineered with photonic multifunction for advanced bio-medical applications”, Reference PID2020-114755GB-C3, Years 2021-2025), and developed by researchers from CSIC (Subproject 1, Reference PID2020-114755GB-C31), UCM (Subproject 2, Reference PID2020-114755GB-C32), and UPV/EHU (Subproject 3; Reference PID2020-114755GB-C33), in collaboration with early- and end-users from specialized Spanish and international research groups. The collected datasets are organized according to the main research outcomes achieved and include, among others, experimental and computational protocol data, equipment data, structural characterization data (e.g., ¹H and ¹³C NMR spectra, FTIR data, HRMS data, polarimetry data, and X-ray diffraction data of relevant compounds), UV-Vis-NIR spectroscopic data (e.g., steady-state absorption and emission spectra, time-delayed emission spectra, nanosecond and microsecond transient absorption spectra, electronic circular dichroism (ECD) spectra, and circularly polarized luminescence (CPL) spectra of relevant compounds in different media, concentrations and irradiation conditions), photophysical data (e.g., UV-Vis absorption, fluorescence, phosphorescence, and laser emission wavelengths, molar absorption coefficients, fluorescence and singlet oxygen quantum yields, fluorescence lifetimes, radiative and non-radiative deactivation rate constants, laser efficiencies, and dissymmetry g-factors of relevant compounds in different media, concentrations and irradiation conditions, along with detailed information on the spectroscopic techniques used), quantum mechanical calculation data (e.g.; computed molecular geometries and energies in the ground and excited states, electronic density maps of frontier orbitals, charge distribution maps, and simulated absorption spectra of relevant compounds, along with detailed information on the software and computational clusters used), and biological and biophotophysical data (e.g., cell uptake data, cell viability data under dark and non-dark conditions, bioimaging behaviour data using established and cutting-edge microscopy techniques, and phototheragnostic behaviour data).
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    Presiones plantares y stabilometria tras presion isquemica
    (2025) Martínez Jiménez, Eva María; Becerro De Bengoa Vallejo, Ricardo; Losa Iglesias, Marta Elena; Perez Boal Eduardo; Posada Ordax, Jorge; Sanchez Serena, Anna; Trevissón Redondo, Bibiana; Benito de Pedro, María; Martinez Córcoles, Vicenta; Casado Hernández, Israel
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    Dataset relacionado con la publicación "La promoción de la lectura para adolescentes migrantes en un proyecto de aprendizaje y servicio: análisis y evaluación de la experiencia"
    (2024) Prados López, Silvia; Fernández de la Mata, Zoe; Montesi, Michela
    El archivo contiene los datos recogidos al finalizar un ciclo de talleres de lectura fácil con adolescentes migrantes en la Biblioteca Municipal Iván de Vargas (Madrid) en mayo de 2024. Se recogieron en hojas impresas y se volcaron manualmente a una hoja de cálculo para su análisis. Los participantes totales fueron 13 personas. La encuesta muestra una valoración muy positiva, especialmente entre quienes leyeron en voz alta. Se destacaron como aspectos más valorados el trabajar en la biblioteca y con personas distintas a sus profesoras habituales - es decir, aspectos relacionados con la participación más que con el valor académico y formativo del taller. En cambio, quienes no leyeron en voz alta, respondieron menos preguntas, mostraron menor motivación y dieron una valoración menos positiva del taller. Datos adicionales sobre el contexto en el que se generaron los datos y su interpretación están disponibles en la respectiva publicación, titulada "La promoción de la lectura para adolescentes migrantes en un proyecto de aprendizaje y servicio: análisis y evaluación de la experiencia" y publicada en la revista RIBES (2025).
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    Data: Flash-PEO of magnesium: phosphate precursor driven functionalization
    (2025) Guerra-Mutis, Marlon Hernando; Vega Vega, Jesus Manuel; Barrena Pérez, María Isabel; Matykina, Endzhe; Arrabal Durán, Raúl
    In this study, a phosphate-based conversion coating (PCC) was applied as a precursor before forming silicate-fluoride (SiF) and silicate-phosphate-fluoride (SiPF) based flash-plasma electrolytic oxidation (Flash-PEO) coatings on AZ31B magnesium alloy. The main novelty is the successful incorporation of calcium, zinc, manganese and phosphate species into the Flash-PEO coatings via a precursor layer rather than using the electrolyte. The precursor also led to longer lasting and more intense discharges during the PEO process, resulting in increased pore size. Corrosion studies revealed similar short-term performance for all coatings, with impedance modulus at low frequencies above 107 Ωcm2, and slightly better performance for the SiPF-based coating. Nonetheless, the enlarged pores in the PEO coatings functionalized with the PCC precursor compromised the effectiveness of self-healing mechanisms by creating diffusion pathways for corrosive species, leading to earlier failure. These phenomena were effectively monitored by recording the open circuit potential during immersion in 0.5 wt.% NaCl solution. In summary, this study demonstrates that conversion coatings are a viable option for the functionalization of PEO coatings on magnesium alloys, as they allow for the incorporation of cationic and other species. However, it is crucial to maintain a small pore size to facilitate effective blockage through self-healing mechanisms.
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    Data: Hybrid PEO/sol-gel coatings loaded with Ce for corrosion protection of AA2024-T3
    (2023) Del Olmo Martínez, Rubén; López Martínez, Esther; Matykina, Endzhe; Tiringer, Ursa; Mol, J.M.C.; Mohedano Sánchez, Marta; Arrabal Durán, Raúl
    Plasma electrolytic oxidation (PEO) has been targeted as an eco-friendly alternative technology to conventional chromic acid anodizing (CAA) for corrosion protection of aluminium alloys in the aircraft industry. However, conventional PEO technology implies high energy consumption. Flash-PEO coatings (≤10 μm) produced in short treatment times (≤ 5 min) constitute a feasible way to overcome this limitation. Nevertheless, the long-term corrosion resistance is compromised, thus requiring novel sealing post-treatments. The present work studies the effect of stand-alone hybrid sol-gel (HSG) and Ce-doped hybrid sol-gel (HSG-Ce) coatings as a sealing post-treatment to evaluate the long-term corrosion resistance of Flash-PEO coatings on aluminium alloy (AA) 2024-T3. The characterization of the PEO, HSG, and HSG-Ce coatings was performed by scanning electron microscopy, X-ray diffraction, water contact angle, dry adhesion tests (ISO 2409), optical profilometry and Fourier transform infrared spectroscopy. The corrosion behaviour was assessed by electrochemical impedance spectroscopy up to 21 days (3.5 wt% NaCl). Active corrosion protection was assessed by immersion tests of artificially scratched coatings. Present findings reveal that low-energy-cost Flash-PEO coatings were successfully formed on AA2024-T3 alloy. Both HSG and HSG-Ce coatings were homogeneously formed on Flash PEO coating. Regarding the corrosion resistance, HSG-Ce showed significant scratch protection during 21 days of immersion in 3.5 wt% NaCl. The results suggest that, while the release of Si and Ce from the coating provided corrosion protection, nitrate release promoted localized corrosion phenomena in the scribe. This was associated with the preferential pitting corrosion phenomena at the Cu-rich intermetallic compounds instead of forming a thick and stablenitrate-rich passive layer.
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    Data: Flash plasma electrolytic oxidation and electrochemical behaviour in physiological media of additive manufacturing Ti6Al4V alloy
    (2024) Mora Sánchez, Hugo; Ramos, Carolina; Mohedano Sánchez, Marta; Torres, Belén; Arrabal Durán, Raúl; Matykina, Endzhe
    The objective of this work is to understand the plasma electrolytic oxidation (PEO) treatment and electrochemical behaviour of a Ti6Al4V alloy manufactured by a laser powder bed fusion additive manufacturing (AM) technique known as direct metal laser sintering (DMLS). Ca and P-containing coatings were produced with short time (<120 s) PEO treatments (also termed as Flash-PEO) obtaining 3–10 μm-thick coatings on both the AM alloy and a conventional counterpart. Subsequently, the electrochemical behaviour of the bare and treated alloys was assessed in a modified α-MEM solution via potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The fine α-lamellar microstructure of the AM alloy with small β-phase particles at the interlamellar spaces was seen to advance the onset of sparking promoting faster growth of PEO coating in comparison to the conventional alloy. Flash-PEO coatings enhanced the corrosion protection of both conventional and AM alloys, the thinnest (<3 μm) coatings providing up to three times greater protection. AM Ti6Al4V was found to be susceptible to localized crevice corrosion which could be assigned to the high grain boundary density. Flash-PEO treatments, even as short as 35 s, were sufficient to successfully prevent it.
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    Data: Corrosion of additively manufactured Ti6Al4V alloy in saline and acidic media
    (2024) Mora Sánchez, Hugo; Collado Vian, Miguel; Mohedano Sánchez, Marta; Arrabal Durán, Raúl; Matykina, Endzhe
    The present work aims to provide corrosion performance data for an additively manufactured Ti6Al4V alloy in saline and polluted environments. The as-received additively manufactured material underwent heat treatment at 850 °C for 3 h to transform the acicular α’ microstructure into a lamellar α microstructure. Comparative corrosion assessments were conducted between the heat-treated substrates, the as-received condition, and a conventionally mill-annealed alloy. Potentiodynamic polarization experiments were carried out in saline (3.5 wt.% NaCl) and acid aqueous media ((NH4)2SO4 containing Harrison’s solution). The corrosion performance of additively manufactured substrates matched or surpassed that of the conventional alloy in Harrison’s solutions while remaining inferior in saline medium, despite forming a thicker passive film. Overall, the XY plane showed better corrosion performance, particularly after the elimination of the acicular α’ martensite by the applied heat treatment. The results also suggested that the presence of the coarse β phase was beneficial in 3.5 wt.% NaCl solution and detrimental in Harrison’s solutions, more so in acidified and fluorinated conditions.
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    Data: In vitro corrosion-assisted cracking of AZ31B Mg alloy with a hybrid PEO+MWCNTs/PCL coating
    (2023) Daavari, Morteza; Conde, Ana; Atapour, Masoud; HosseinpourRokni, Mohsen; Mora Sánchez, Hugo; Mohedano Sánchez, Marta; Matykina, Endzhe; Arrabal Durán, Raúl
    The effects of multi-walled carbon nanotubes (MWCNTs) incorporation and polycaprolactone (PCL) post-treatment on the environmental-assisted cracking behaviour of a plasma electrolytic oxidation (PEO) coated AZ31B Mg alloy were elucidated in this study. Slow strain rate tensile (SSRT) experiments were carried out in simulated body fluid (SBF) for the bare material and different coating systems with and without MWCNTs and PCL overlay. Electrochemical impedance spectroscopy (EIS) and microscopic examinations (SEM and optical) were also conducted to reveal the role of corrosion on the mechanical response. In spite of the significant positive influence of the PEO coatings (with and without MWCNTs) on the bio-electrochemical behaviour of the AZ31B alloy, the environmental-assisted cracking performance was only marginally improved. Furthermore, PEO+MWCNTs/PCL coating system increased the fracture strain of the specimens by 7% compared to the uncoated specimens. Based on the SEM and optical micrographs, hydrogen embrittlement was suggested as the main cause of failure of the coated specimens under the in vitro slow strain rate test conditions.