Listar QUIO_Articles por autoría "2aabcc6f-0877-4478-9b97-f19e1eed3c17"

Mostrando ítems 1-20 de 51

    • openAccess   A new series of environment-friendly reddish inorganic pigments based on AFeO3 (A = Ln, Y) with high NIR solar reflectance 

      Fortuño-Morte, Maria; Serna-Gallén, Pablo; Beltrán Mir, Héctor; Cordoncillo, Eloisa Elsevier (2021-02-11)
      Environment-friendly pigments based onAFeO3(A¼La, Pr, Nd, Sm, Gd, Tb, Y or Yb) with high near-infrared (NIR) reflectance were synthesised by a coprecipitation method at 1200 C. The Rietveldrefinement analysis showed ...

    • closedAccess   A novel approach to obtain highly intense self-activated photoluminescence emissions in hydroxyapatite nanoparticles 

      Machado, Thales Rafael; Sczancoski, Júlio César; Beltrán Mir, Héctor; Costa Nogueira, Içamira; Siu Li, Maximo; Andres, Juan; Cordoncillo, Eloisa; Longo, Elson Elsevier (2017-05)
      Defect-related photoluminescence (PL) in materials have attracted interest for applications including near ultraviolet (NUV) excitable light-emitting diodes and in biomedical field. In this paper, hydroxyapatite [Ca10(PO4)6(OH)2] ...

    • openAccess   A site-selective fluorescence spectroscopy study of the crystal phases of KY3F10: Leveraging the optical response of Eu3+ ions 

      Serna-Gallén, Pablo; Beltrán Mir, Héctor; Cordoncillo, Eloisa; Balda, Rolindes; Fernández-León, Joaquín Elsevier (2023-04-18)
      The present work deals with the investigation of the site-selective symmetries in Eu3+-doped KY3F10 with different crystal phases. Employing time-resolved fluorescence line-narrowing (TRFLN), a study of the luminescent ...

    • openAccess   Ag Nanoparticles/α-Ag2WO4 Composite Formed by Electron Beam and Femtosecond Irradiation as Potent Antifungal and Antitumor Agents 

      Assis, Marcelo de; Robeldo, Thaiane; Foggi, Camila Cristina; Kubo, A.M.; Mínguez-Vega, Gladys; Cordoncillo, Eloisa; Beltrán Mir, Héctor; Torres-Mendieta, Rafael; Andres, Juan; Oliva, Mónica; Vergani, Carlos; Barbugli, P.A.; Camargo, E.R.; Borra, Ricardo Carneiro; Longo, Elson Nature Research (2019)
      The ability to manipulate the structure and function of promising systems via external stimuli is emerging with the development of reconfigurable and programmable multifunctional materials. Increasing antifungal and antitumor ...

    • openAccess   Atmosphere- and Voltage-Dependent Electronic Conductivity of Oxide-Ion-Conducting Zr1-xYxO2-x/2 Ceramics 

      Jovaní, Marc; Beltrán Mir, Héctor; Cordoncillo, Eloisa; West, Anthony R. ACS (2017-05)
      Cubic, fluorite-structured solid solutions Zr1-xYxO2-x/2 (YSZ; x = 0.4-0.7) were prepared by sol-gel synthesis. Impedance measurements on pellets of 85% approximate density sintered at 1300 °C for 24 h showed strong evidence ...

    • openAccess   Behavior of Bi2S3 under ultrasound irradiation for Rhodamine B dye degradation 

      Teodoro , Vinícius; Barrios Trench, Aline; da Trindade, Letícia; jacomaci, natalia; Beltrán Mir, Héctor; Andres, Juan; Cordoncillo, Eloisa; Bettini, Jefferson; Longo, Elson Elsevier (2021-10-16)
      In this study, we have demonstrated that Bi2S3 semiconductor under ultrasound behaves as a piezoelectric material, facilitating the transfer of electrons and holes, thus enabling the formation of oxidizing agents. In the ...

    • closedAccess   Designing biocompatible and multicolorfluorescent hydroxyapatitenanoparticles for cell-imaging applications 

      Machado, Thales Rafael; Leite, I. S.; Inada, N. M.; Li, Maximo Siu; Da Silva, J. S.; Andres, Juan; Beltrán Mir, Héctor; Cordoncillo, Eloisa; Longo, Elson Elsevier (2019)
      In recent years, there has been a growing effort toward the synthesis, engineering and property tuning of biocompatible nanoparticles (NPs) that can be detected by confocal microscopy and then used as fluorescent probes. ...

    • openAccess   Effect of the oxidation states on the electrical properties of Fe-doped Pr2Zr2O7 pyrochlore 

      Santos Veiga, Emerson Luiz; Fortuno-Morte, María; Beltrán Mir, Héctor; Cordoncillo, Eloisa Elsevier (2022-01-01)
      Pyrochlores with formula Pr2Zr2-xFexO7±d (x ¼ 0.00, 0.05, 0.10 and 0.15) were synthesized by the coprecipitation method. Pellets of these compositions sintered at 1400 C for 12 h were characterized by XRD, Rietveld ...

    • openAccess   Enhanced conductivity and nonlinear voltage–current characteristics of nonstoichiometric BaTiO3 ceramics 

      Beltrán Mir, Héctor; Prades Tena, Marta; Masó, Nahum; West, Anthony R.; Cordoncillo, Eloisa Wiley-Blackwell (2011-03-21)
      The electrical conductivity of both BaO-deficient and TiO2-deficient BaTiO3 ceramics shows nonohmic, low-field characteristics at temperatures >∼200°C in contrast to stoichiometric BaTiO3 for which the electrical conductivity ...

    • openAccess   Environmental-friendly red-orange ceramic pigment based on Pr and Fe co-doped Y2Zr2O7 

      Jovaní, Marc; Fortuño-Morte, Maria; Beltrán Mir, Héctor; Cordoncillo, Eloisa Elsevier (2017-12)
      A new environmental-friendly red-orange ceramic pigment based on the general formula Y2-xPrxZr2-yFeyO7-δ was prepared by polymeric sol-gel method at 1400 °C. The solid solution range with defect fluorite structure ...

    • openAccess   Environmental-friendly yellow pigment based on Tb and M (M = Ca or Ba) co-doped Y2O3 

      De la Luz, Verónica; Prades Tena, Marta; Beltrán Mir, Héctor; Cordoncillo, Eloisa Elsevier (2013)
      A yellow inorganic ceramic pigment with general formula Y1.86−xMxTb0.14O3−x/2 (M = Ca and/or Zn) with x = 0.06, 0.32 and 0.64 were synthesized by a modified Pechini method. XRD, SEM and HRTEM/EDX analysis showed the formation ...

    • closedAccess   Evaluation of Pr2Zr2−xCexO7±δ pyrochlores as a potential Cu support catalysts for CO oxidation in simulated GDI conditions 

      Veiga, Emerson Luiz dos Santos; Díaz Verde, Álvaro; Martinez Illan, Antonio; Beltrán Mir, Héctor; Cordoncillo, Eloisa Elsevier (2023-03)
      This study evaluates the catalytic activity, both as bulk catalysts and as supports for copper catalysts for CO oxidation in a simulated Gasoline Direct Injection Engine (GDI) of two pyrochlores: Pr2Zr2O7 (PZ) and ...

    • openAccess   Field enhanced bulk conductivity of acceptor-doped BaTi1−xCaxO3−x ceramics 

      Masó, Nahum; Prades Tena, Marta; Beltrán Mir, Héctor; Cordoncillo, Eloisa; Sinclair, Derek C.; West, Anthony R. American Institute of Physics (2010)
      The electrical properties of Ca-doped BaTiO3 are very different when Ca substitutes onto Ba or Ti sites. The p-type semiconductivity of Ti-substituted ceramics increases reversibly by one to two orders of magnitude under ...

    • closedAccess   Field enhanced bulk conductivity of BaTiO3 : Mg ceramics 

      Prades Tena, Marta; Masó, Nahum; Beltrán Mir, Héctor; Cordoncillo, Eloisa; West, Anthony R. Royal Society of Chemistry (2010)
      The electrical conductivity of ceramics of composition Ba(Ti1−xMgx)O3−x: 0.00003 ≤ x ≤ 0.01 increases with time on application of a small dc bias voltage in the range 1 to 50 V cm−1 and at temperatures in the range 200 to ...

    • openAccess   Field-enhanced bulk conductivity and resistive-switching in Ca-doped BiFeO3 ceramics 

      Masó, Nahum; Beltrán Mir, Héctor; Prades Tena, Marta; Cordoncillo, Eloisa; West, Anthony R. Royal Society of Chemistry (2014)
      The bulk conductivity at room temperature of Ca-doped BiFeO3 ceramics is p-type and increases reversibly by up to 3 orders of magnitude under the influence of a small dc bias voltage in the range B3 to 20 V mm1 . The ...

    • openAccess   Field-induced p-n transition in yttria-stabilized zirconia 

      Jovaní, Marc; Beltrán Mir, Héctor; Cordoncillo, Eloisa; West, Anthony R. Nature (2019)
      Oxide ion conducting yttria-stabilised zirconia ceramics show the onset of electronic conduction under a small bias voltage. Compositions with a high yttria content undergo a transition from p-type to n-type behavior at ...

    • openAccess   From Complex Inorganic Oxides to Ag–Bi Nanoalloy: Synthesis by Femtosecond Laser Irradiation 

      Machado, Thales Rafael; Guerra Macedo, Nadia; Assis, Marcelo de; Doñate-Buendía, Carlos; Mínguez-Vega, Gladys; Teixeira, Mayara Mondego; Foggi, Camila Cristina; Vergani, Carlos; Beltrán Mir, Héctor; Andres, Juan; Cordoncillo, Eloisa; Longo, Elson American Chemical Society (2018-08-24)
      Bimetallic nanoalloys with a wide variety of structures and compositions have been fabricated through many diverse techniques. Generally, various steps and chemicals are involved in their fabrication. In this study, the ...

    • openAccess   Improvement in varistor properties of CaCu3Ti4O12 ceramics by chromium addition 

      Grzebielucka, Edson; Monteiro, Joao Frederico; Souza, Eder; Borges, Christiane Philippini Ferreira; Chaves de Andrade, André Vitor; Cordoncillo, Eloisa; Beltrán Mir, Héctor; Masetto Antunes, Sandra Regina Elsevier (2019-11-17)
      The effect of chromium addition on the structure and electrical properties of CaCu3Ti4O12 is studied. Compositions based on the formula CaCu3Ti4-xCrxO12-δ (x = 0, 0.025, 0.050 and 0.075 mol%) are prepared by solid-state ...

    • openAccess   Kinetics or thermodynamics? Extolling their role to modulate the crystal phases and luminescence of KY3F10:Eu3+ powders 

      Serna-Gallén, Pablo; Beltrán Mir, Héctor; Cordoncillo, Eloisa Royal Society of Chemistry (2023-09-28)
      KY3F10, a fluoride compound with two polymorphs (alpha and delta), has been a subject of study due to its unique properties. Obtaining the metastable delta-phase has been challenging, but this study presents an enhanced ...

    • openAccess   Laser and electron beam-induced formation of Ag/Cr structures on Ag2CrO4 

      Lemos, Pablo; Silva, G. S.; Roca, R. A.; Assis, Marcelo de; Torres-Mendieta, Rafael; Beltrán Mir, Héctor; Mínguez-Vega, Gladys; Cordoncillo, Eloisa; Andres, Juan; Longo, Elson Royal Society of Chemistry (2019)
      The interactions of silver chromate (Ag2CrO4) with a femtosecond (fs) laser and electron beam irradiations were investigated. For the first time, the growth and coalescence of metallic Ag nanoparticles (NPs) on an Ag2CrO4 ...