Person: Alcolea Palafox, Mauricio
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First Name
Mauricio
Last Name
Alcolea Palafox
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Física
Area
Química Física
Identifiers
11 results
Search Results
Now showing 1 - 10 of 11
- Project number: 3
Item Elaboración de material audiovisual de uso en asignaturas prácticas y teórico prácticas de grados y dobles grados que tratan la química(2023) Isasi Marín, Josefa; Alcolea Palafox, Mauricio; Fernández-Ramos Humanes, Miguel; Rapp Diez de la Cortina, María; Hernán García, Esther; de la Lastra Martínez, Jaime; Alba Isasi, Pablo; Cáceres Ramos, Silvia; Alba Isasi, Carlos; Herranz Muñoz, Irene; Gordo Lozano, Marta; Luliana Ionita, Andrea; García Calvo, Elena; Espada Morán, Luis; Villa García, Mª Isabel; Martín Gandul, Mª del Carmen; Arévalo Cid, Pablo; Martinez Pacheco, Andrea; Boulahya, Khalid; Marco Arquero, Alexia; Arquero Avilés, María Del Rosario; Marco Arquero, Carla; Marco Arquero, María; Marco Cuenca, Gonzalo; Criado García, Mª Rosario; Sánchez Calero, LuisaEn el desarrollo del proyecto se han elaborado un total de 25 tutoriales que se convertirán en la guía con la que los estudiantes y el profesorado podrán recordar el funcionamiento de todos los softwares utilizados durante el grado (Excel, Origin, Avogadro, ChemSketch, Vesta, X´pert, Checkell, Hyperchem y Fullprof), pudiendo aprender además aquello que no se asimiló bien o lo que nunca se llegó a conocer de estos programas. Este material está ya a disposición de todos los estudiantes de la UCM y de otras universidades en el canal QuimIsasi (https://www.youtube.com/channel/UCNG3-lLP2AetTksEBC0hAw) en el espacio de título "Material audiovisual de uso en asignaturas prácticas de grados que tratan la Química", siendo de suma utilidad para el alumnado que vaya a cursar o que cursará diferentes asignaturas prácticas y teórico-prácticas incluidas en grados y dobles grados que tratan la Química. El análisis y evaluación del material audiovisual elaborado podrá permitir un aprendizaje más eficaz del manejo de distintos programas que, como se verá, va a permitir llevar a cabo: cálculos generales y estadísticos, creación de bases de datos, dibujos de moléculas y su simetría, representación de estructuras de compuestos inorgánicos/orgánicos y cálculos de parámetros de celdilla de esas estructuras o de sus momentos magnéticos. Item Synthesis, structural and morphological characterization and photoluminescence study of Y0.9Er0.1−xYbxVO4 materials(Journal of alloys and compounds, 2022) Rapp, M.; Isasi Marín, Josefa; Alcolea Palafox, Mauricio; Muñoz Ortiz, T.; Ortiz Rivero, E.Erbium/ytterbium-dopped Y0.9Er0.1−xYbxVO4 samples with x = 0, 0.01, 0.05 and 0.09 were synthesized by hydrothermal synthesis at basic pH with urea addition. For comparison purposes, another sample with x = 0 was also prepared by the solgel method. X-ray diffraction patterns were indexed on the basis to a tetragonal symmetry of space group I41/amd with Z = 4 compatible with a zircon-type, in good agreement with FTIR spectra. Additionally, some of the samples were coated with silica, and the successful coating process was verified in both X-ray diffraction profiles and FTIR spectra. Particles of two different morphologies were found in transmission electron microscopy images of uncoated samples, some spherical with sizes between 14 and 20 nm and others elongated. A shell of ~ 5 nm thickness was also observed in silica covered samples. The relationship between dopant content and the luminescence emission was systematically explored. Erbium-doped samples exhibit bright green fluorescence under stimulation at 360 nm. The substitution of erbium by ytterbium successfully produced an up-conversion emission under stimulation at 808 nm, being able to observe green and red emission bands. The potential use as fluorescent thermometers of erbium/ ytterbium doped samples at 300, 325 and 350 K was finally investigated- Project number: 4
Item Ventana virtual a un laboratorio de química(2019) Isasi Marín, Josefa; Abuin Vences, Natalia; Arévalo Cid, Pablo; Alcaraz Romo, Lorena; Alcolea Palafox, Mauricio; Fernández González, Mario; Caballero Sánchez, Elena; González Rodríguez, Diego; Espada Morán, Luis; Villa García, María Isabel; Boulahya, Khalid; Morocho Chávez, Erika Patricia; Rodríguez Boehm, Íñigo; Martínez Fernández, Alejandro; Criado García, Rosario Presentación; Gómez de Castro, Consuelo; Pañeda de la Peña, Victoria; Fernández Sola, Julia; Torres Álvarez, SergioEl proyecto desarrollado pone a disposición de los centros docentes en un canal de YouTube, https://www.youtube.com/channel/UCNG3-lLP2AetT-ksEBC0hAw, una ventana virtual a un laboratorio de química. Se visualizan vídeos de prácticas diseñadas para hacer mucho más comprensible el estudio de la química general. Item Superparamagnetic and light-emitting bifunctional nanocomposites of iron oxide and erbium or thulium doped yttrium orthovanadate(Journal of Alloys and Compounds, 2022) Rapp Díez de la Cortina, María; Lozano Vilches, Yaiza; Fernández Ramos, Miguel; Isasi Marín, Josefa; Alcolea Palafox, MauricioAdvances in biomedical research have increased interest in obtaining and studying new bifunctional materials for use in theragnostic. Here we describe in detail the preparation of new magnetic-fluorescent bifunctional (Y0.9Ln0.1VO4/Fe3O4)@SiO2 and [(Y0.9Ln0.1VO4 @SiO2)/Fe3O4)@SiO2] nanocomposites with Ln = Er or Tm. In addition, their magnetic and optical properties were carefully analyzed. The influence of Fe3O4 content and the silica shell thickness on the fluorescent emission in the VIS-NIR region of Y0.9Ln0.1VO4 cores was evaluated as well as their use as display systems with the possibility of directing them by means of external magnetic fields. Samples were prepared using wet chemistry methods involving low temperatures and short reaction times. Y0.9Ln0.1VO4 samples that are not easily oxidizable were prepared by a hydrothermal method, while Fe3O4 sample was synthesized by a coprecipitation process in which the mixture of precursors was treated at very low temperature to avoid oxidation. The powder amalgamation of both Y0.9Ln0.1VO4 and Fe3O4 samples was possible due to the silica polymeric network synthetized by a modified Stöber method. The purity of all samples was ensured by XRD and FTIR techniques. Diffraction profiles of Y0.9Ln0.1VO4 samples show diffraction maxima that can be indexed to a tetragonal symmetry of space group I41/amd, compatible with the zircon structure-type of YVO4 host. All reflections present in the diffraction profile of Fe3O4 sample can be indexed to a cubic symmetry of space group Fd3̅m, characteristic of an inverse spinel structure-type. The amorphous silica incorporation on the samples was also evaluated by TEM images. Studies of the magnetic behavior and luminescent emission intensity of the investigated samples showed their dependence on both, the silica coating thickness, and the contact or not between the luminescent samples and the magnetic powder.- Project number: 229
Item Ciencia on-line de uso para la prevención y mejora de los efectos del Covid-19(2021) Alcolea Palafox, Mauricio; Isasi Marín, Josefa; Calvo Lobo, César; Pedraza Velasco, María Lourdes de; Becerro de Bengoa Vallejo, Ricardo; Rodríguez Sanz, David; Alba Aparicio, Valentin; Espada Morán, Luis; Toninelli Rodriguez, Sergio; Martinez Pacheco, Andrea; Fernández-Ramos Humanes, Miguel; Rapp Díez de la Cortina, María; Lozano Vilches, Yaiza; Gómez Prados, SergioEl proyecto se planteó con el objetivo general de actuar ante la necesidad de hacer más motivador y comprensible el estudio de alguna de las materias que se imparten hoy en nuestras facultades, poniendo de relieve la prevención y mejora que los efectos del confinamiento por el Covid-19 pudieran acentuarse de cara al futuro. - Project number: 83
Item Enseñanza de química con fundamento. Ensayos virtuales(2022) Isasi Marín, Josefa; Arquero Avilés, María Del Rosario; Marco Cuenca, Gonzalo; Fernández-Ramos Humanes, Miguel; Rap diez de la Cortina, María; Martínez Pacheco, Andrea; Gómez Prados, Sergio; Lozano Vilches, Yaiza; Alba Isasi, Pablo; Alba Isasi, Carlos; Marco Arquero, María; Alba Isasi, María Teresa; Alcolea Palafox, Mauricio; Espada Morán, Luis; Marco Arquero, Carla; Marco Arquero, Alexia; Herranz Muñoz, Irene; Cáceres Ramos, Silvia; Hernán García, Esther; de la Lastra Martínez, Jaime; Veas Porlán, Manuel; Pareja García, Arturo; García Calvo, Elena; Ferreiro de Aguiar, Adriana; Fernández Rivero, Adrian; Gordo Lozano, Marta; Arévalo Cid, Pablo; Boulahya, Khalid; Sánchez Calero, Luisa24 vídeos se han elaborado en el desarrollo del trabajo. Estos vídeos muestran grabaciones de experimentos sencillos que tratan contenidos de Química general y su explicación. El trabajo está teniendo una buena aceptación, tal y como lo demuestran las muchas entradas al canal de YouTubehttps://www.youtube.com/channel/UCNG3-lLP2AetT-ksEBC0hAw/video - Project number: 6
Item Colección de cuentos de Química y Genética para el fomento de nuevas vocaciones científicas(2021) Isasi Marín, Josefa; Alcolea Palafox, Mauricio; Alba Isasi, María Teresa; Alba Isasi, Carlos; Alba Isasi, Pablo; Lachiondo Camuñas, María; Lachiondo Camuñas, Silvia; Sánchez Calero, Luisa; Pozo Lite, María Luisa Del; Pradillo Orellana, Mónica; Fernández Jiménez, Nadia; Boyano González, Marina; Pérez González, Ana Elisa; Araujo Gutiérrez, Antonio Diego; Ventura Balazar, Gianmarco; Arquero Avilés, María Del Rosario; Espada Morán, Luis; Marco Cuenca, Gonzalo; Marco Arquero, María; Villar Tajadura, María AntoniaSe han escrito diez narraciones que incluyen contenidos básicos de Química y de Genética. Su lectura y reflexión podrá clarificar conceptos que, en ocasiones, se aprenden sin entender su verdadero significado y, tal entendimiento, podrá contribuir a incrementar el interés por la ciencia y al fomento de nuevas vocaciones científicas. Item Effects of the Sr/Ba and Eu2+/Eu3+/Dy3+ ions content on the luminescent emission of M0.90Eu0.1‐xDyxZr4(PO4)6 nanophosphors with M = Sr or Ba and x = 0, 0.025, 0.050 and 0.075(Journal of Alloys and Compounds, 2023) Martínez, Andrea; Isasi Marín, Josefa; Gómez, Sergio; Alcolea Palafox, Mauricio; Gumiel, Carlos; Peiteado, Marco; Alcaraz, Lorena; Science Citation Index ExpandedThe preparation and study of new pure M0.90Eu0.1‐xDyxZr4(PO4)6 samples with M = Sr or Ba and x = 0, 0.025, 0.050 and 0.075 was described here in detail. Currently, the luminescent emission study of this type of samples based on their tunable with the type and content of ions in the host lattice is the subject of research. These samples were synthesized by a combustion route with urea addition, followed by treatment in a reducing N2/H2 atmosphere. The effect of the strontium by barium substitution and the europium by dysprosium partial substitution on the structure, powder morphology, luminescent emission and magnetic behavior was investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL) spectroscopy and magnetic measurements. X-ray diffraction patterns of the pure samples show diffraction maxima that can be assigned to a rhombohedral symmetry of space group R-3 with Z=6, compatible with a NASICON-type structure. FTIR spectra of the investigated samples show a broad band assignable to the different vibrational modes of the PO4 3- groups. The experimental FTIR study was complemented with a theoretical study based on the SrZr4(PO4)6 structure and using different DFT methods and basis sets. Highly agglomerated spherical nanoparticles with an average particle size of about 18 nm that slightly increased with dysprosium content were found in TEM images. Broad emission bands were observed in the PL spectra of obtained samples, related to both the strontium by barium substitution and the different Eu2+/Eu3+/Dy3+ content. Magnetic susceptibility curves as a function of temperature confirm the presence of Eu2+ ions in Sr0.90Eu0.1Zr4(PO4)6 sample, and of Dy3+ ions with different Eu2+/Eu3+ ions content in the remaining M0.90Eu0.1‐xDyxZr4(PO4)6 samples.Item Synthesis of new non-covered and silica-covered Y0.9Tm0.1-xYbxVO4 nanophosphors with emission in the visible and NIR ranges(Journal of Luminescence, 2023) Lozano, Yaiza; Fernández-Ramos, Miguel; Rapp, María; Alcolea Palafox, Mauricio; Ortiz-Rivero, Elisa; Muñoz-Ortiz, Tamara; Isasi Marín, JosefaThe development of new materials of interest in the bioimaging field is a relevant topic in current research. We present and study here novel non-covered and silica-covered Y0.9Tm0.1-xYbxVO4 samples with x = 0, 0.01, 0.05 and 0.09 that were prepared by hydrothermal synthesis. For comparison purposes, the study of Y0.9Tm0.1VO4 sample synthesized by the sol-gel method was also included. The relationships between the synthesis method, dopant content and luminescence emission were systematically studied by X-ray diffraction (XRD), FTIR spectroscopy and transmission electron microscopy (TEM). XRD profiles and FTIR spectra confirm the zircon-type structure of the obtained samples. Particles of two different morphologies were found in TEM images of uncoated samples, some spherical with sizes between 42 and 50 nm and others elongated. A shell thickness between 8 and 13 nm was also observed in silica-covered samples. Photoluminescence studies of our samples revealed emission in the NIR and visible ranges. Under excitation at 790 nm, the spectra of thulium-doped samples showed the characteristic emission band of Tm3+ ions. Substitution of thulium by ytterbium successfully led to an up-conversion emission under excitation at 980 nm. Finally, the fluorescent emission study in the NIR of samples that could be more biocompatible demonstrated that they are suitable for use as luminescent thermometers in the physiological temperature range.Item Structural and magnetic studies of NiFe2O4 and NiFe2O4@SiO2-Silane agent samples useful for the removal of Cu2+ ions(Journal of Alloys and Compounds, 2022) Ferrer, Carlos; Isasi Marín, Josefa; Arévalo, Pablo; Fernández-Ramos, Miguel; Rapp, María; Alcolea Palafox, Mauricio; Marco, Jose; Martín-Hernández, FátimaNickel ferrite samples are currently investigated due to their potential technological applications. For this reason, the optimal synthesis conditions of nickel ferrite samples with small particle size were investigated here. First, a systematic study was carried out using urea as an additive, and varying reaction parameter such as the amount of urea added or the reaction temperature and time. For comparison purposes, another sample was synthesized using potassium hydroxide as an additive. The two pure nickel ferrite samples were coated with silica, functionalizing them with APTES and AEPMDS. X-rays, FTIR, Mössbauer spectroscopy, TEM and Ms vs. H and FC/ZFC curves were used for the characterization of samples and the evaluation of their properties. Square particles with an average size of 21.2 nm were observed in the TEM images of the sample synthesized with urea, while these are spherical of 6.2 nm in the sample prepared with potash. Their subsequent coating and functionalization give rise to an arrangement of particles within interlocking strands whose thickness increases with their size. Ms vs. H curves confirm the almost superparamagnetic behavior of all synthesized powders, although with a slight increase in the coercivity value of the samples prepared with urea. Preliminary tests carried out on the functionalized samples to evaluate the adsorption capacity in aqueous solution and their easy separation in presence of an external magnetic field, confirm that the sample syn thesized with urea and functionalized with AEPDMS is the most efficient for the Cu2+ ions removal.