Person:
Isasi Marín, Josefa

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First Name
Josefa
Last Name
Isasi Marín
URI
https://hdl.handle.net/20.500.14352/76120
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Inorgánica
Area
Química Inorgánica
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2021 - 20223
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Author: Lozano Vilches, Yaiza ×

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Now showing 1 - 3 of 3
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    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, Mauricio
    Advances 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.
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    Project number: 229
    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, Sergio
    El 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.
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    Project number: 83
    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, Luisa
    24 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