Listar QICM - Artículos por título

Mostrando ítems 81-100 de 112

    • Reactive belite stabilization mechanisms by boron-bearing dopants 

      Cuesta-Garcia, Ana Maria; Losilla, Enrique R.; García-Aranda, Miguel Ángel; Sanz, Jesús; Gomez-de-la-Torre, Maria de los Angeles (Elselvier, 2012-01-27)
      Belite-rich cements hold promise for reduced energy consumption and CO2 emissions, but their use is hindered by the slow hydration rates of ordinary belites. This drawback may be overcome by activation of belite by doping. ...

    • Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods 

      García-Aranda, Miguel Ángel (Taylon & Francis, 2015)
      The portfolio of available synchrotron radiation techniques is increasing notably for cements and pastes. Furthermore, sometimes the terminology is confusing and an overall picture highlighting similarities and differences ...

    • Relationship between the Structure and Transport Properties in the Ce1−xLaxO2−x/2 System 

      Zamudio-García, J; Porras-Vázquez, José Manuel; Canales-Vázquez, J.; Cabeza-Diaz, Aurelio; Losilla, Enrique R.; [et al.] (American Chemical Society, 2019-06-25)
      La-doped CeO2 materials have been widely investigated for potential applications in different high-temperature electrochemical devices, such as fuel cells and ceramic membranes for hydrogen production. However, the crystal ...

    • Rheological and hydration characterization of calcium sulfoaluminate cement pastes 

      García-Maté, Marta; Santacruz-Cruz, Maria Isabel; Gomez-de-la-Torre, Maria de los Angeles; León-Reina, Laura; García-Aranda, Miguel Ángel (2015-05-14)
      Calcium sulfoaluminate (CSA) cements are currently receiving a lot of attention because their manufacture produces less CO2 than ordinary Portland cement (OPC). However, it is essential to understand all parameters which ...

    • Rietveld quantitative phase analyses of SRM 2686a: a standard Portland clinker 

      García-Maté, Marta; Álvarez-Pinazo, Gema; León-Reina, Laura; Gomez-de-la-Torre, Maria de los Angeles (2018-10-03)
      SRM 2686a is a NIST reference Portland clinker with reported mineralogical analysis from powder diffraction and electron microscopy. This sample is used in ASTM C1365 test method for Rietveld quantitative phase analysis ...

    • Rietveld Quantitative Phase Analysis of Oil Well Cement: in Situ Hydration Study at 150 Bars and 150 °C 

      Fraga, Edmundo; Cuesta-Garcia, Ana Maria; Zea-Garcia, Jesus D.; Gomez-de-la-Torre, Maria de los Angeles; Yañez-Casal, Armando; [et al.] (MDPI - Publisher of Open Access Journals, 2019-06)
      Oil and gas well cements are multimineral materials that hydrate under high pressure and temperature. Their overall reactivity at early ages is studied by a number of techniques including through the use of the consistometer. ...

    • Rietveld Quantitative Phase Analysis of OPC Clinkers, Cements and Hydration Products 

      García-Aranda, Miguel Ángel; Gomez-de-la-Torre, Maria de los Angeles; León-Reina, Laura (Mineralogical Society of America, 2012)

    • Rietveld quantitative phase analysis of Yeelimite-containing cements 

      Álvarez-Pinazo, Gema; Cuesta-Garcia, Ana Maria; García-Maté, Marta; Santacruz-Cruz, Maria Isabel; Losilla, Enrique R.; [et al.] (Elsevier, 2012-03-26)
      Yeelimite-containing cements are attracting attention for their tailored properties. Calcium sulfoaluminate, CSA, cements have high contents of Yeelimite and they are used for special applications. Belite calcium sulfoaluminate, ...

    • Rietveld quantitative phase analysis of yeelimite-containing cements 

      Álvarez-Pinazo, Gema; Cuesta-Garcia, Ana Maria; García-Maté, Marta; Santacruz-Cruz, Maria Isabel; Losilla, Enrique R.; [et al.] (Karen Scrivener, 2012)
      Yeelimite-containing cements are attracting attention for their tailored properties. Calcium sulfoaluminate, CSA, cements have high contents of Yeelimite and they are used for special applications. Belite calcium sulfoaluminate, ...

    • Rietveld quantitative phase analysis with molybdenum radiation 

      Cuesta-Garcia, Ana Maria; Álvarez-Pinazo, Gema; García-Maté, Marta; Santacruz-Cruz, Maria Isabel; García-Aranda, Miguel Ángel; [et al.] (Cambridge Core, 2014)
      Building materials are very complex samples of worldwide importance; hence quantitative knowledge of their mineralogical composition is necessary to predict performances. Rietveld quantitative phase analysis (RQPA) allows ...

    • Selective Conversion of Glucose to 5-Hydroxymethylfurfural by Using L-Type Zeolites with Different Morphologies 

      Ginés-Molina, María José; Ahmad, Nur Hidayahni; Mérida-Robles, Sandra; García-Sancho, Cristina; Mintova, Svetlana; [et al.] (MDPI, 2019-12-16)
      In the present work, the morphology of L-type zeolite (LTL topology) has been modified in order to evaluate the influence of several protonated-form LTL-zeolites with different morphologies on their stability and catalytic ...

    • Stability and electrochemical performance of nanostructured La2CuO4þd cathodes 

      Dos Santos-Gómez, Lucía; Porras-Vázquez, José Manuel; Hurtado, Javier; Losilla, Enrique R.; Marrero-López, David (Elsevier, 2019-02-21)
      La2CuO4þd cathode layers are prepared by spray-pyrolysis deposition and their structural, microstructural and electrical properties are compared with those of submicrometric powders obtained from freeze-dried precursors. ...

    • Structural and Proton Conductivity Studies of Fibrous π-Ti2O(PO4)2·2H2O: Application in Chitosan- Based Composite Membranes 

      Babaryk, Artem A.; Adawy, Alaa; García, Inés; Trobajo, Camino; Amghouz, Zakariae; [et al.] (The Royal Society of Chemistry, 2021)
      Although the fibrous polymorphic modification of titanium phosphate, π-Ti2O(PO4)2·2H2O (π-TiP) is known for decades, its crystal structure has remained unsolved. Herewith we report the crystal structure of π-TiP at a room ...

    • Structural Mapping and Framework Interconversions in 1D, 2D, and 3D Divalent Metal R,S-Hydroxyphosphonoacetate Hybrids 

      Colodrero, Rosario M.P.; Olivera-Pastor, Pascual; Cabeza-Diaz, Aurelio; Papadaki, M.; Demadis, Konstantinos D.; [et al.] (American Chemical Society, 2009-12-16)
      Reactions of divalent cations (Mg2þ, Co2þ, Ni2þ, and Zn2þ) with R,S-hydroxyphosphonoacetic acid (HPAA) in aqueous solutions (pH values ranging 1.0-4.0) yielded a range of crystalline hydrated M-HPAA hybrids. Onedimensional ...

    • Structural variability in M2+ 2-hydroxyphosphonoacetate moderate proton conductors 

      Pérez Colodrero, Rosario Mercedes; Ruiz Salcedo, Inés; Bazaga García, Montse; Milla-Pérez, Diego F.; Durán-Martín, Jonatan D.; [et al.] (De Gruyter, 2017)
      The structural variability of two series of Mg2+- and Zn2+- 2-hydroxyphosphonoacetates have been studied in the range of 25–80 °C and 95 % relative humidity in order to correlate the structure with the proton conductivity ...

    • Structural Variability in Multifunctional Metal Xylenediaminetetraphosphonate Hybrids 

      Colodrero, Rosario M.P.; Angeli, Giasemi K.; Bazaga García, Montse; Olivera-Pastor, Pascual; Villemin, Didier; [et al.] (American Chemical Society, 2013-07-24)
      Two new families of divalent metal hybrid derivatives from the aromatic tetraphosphonic acids 1,4- and 1,3-bis(aminomethyl)benzene-N,N′-bis(methylenephosphonic acid), (H2O3PCH2)2−N−CH2C6H4CH2−N(CH2PO3H2)2 (designated herein ...

    • Structure of stratlingite and effect of hydration methodology on microstructure 

      Santacruz-Cruz, Maria Isabel; Gomez-de-la-Torre, Maria de los Angeles; Álvarez-Pinazo, Gema; Cabeza-Diaz, Aurelio; Cuesta-Garcia, Ana Maria; [et al.] (ICE publishing, 2015)
      Stratlingite, Ca4Al2(OH)12[AlSi(OH)8]2•2H2O, is an AFm phase which appears as hydration product of aluminum-rich cements. These binders may be calcium aluminate cements, calcium sulfoaluminate cements and also Belite Calcium ...

    • Structure, Atomistic Simulations, and Phase Transition of Stoichiometric Yeelimite 

      Cuesta-Garcia, Ana Maria; Gomez-de-la-Torre, Maria de los Angeles; Losilla, Enrique R.; Peterson, Vanessa K.; Rejmak, Pawel; [et al.] (ACS publications, 2013)
      ABSTRACT: Yeelimite, Ca4[Al6O12]SO4, is outstanding as an aluminate sodalite, being the framework of these type of materials flexible and dependent on ion sizes and anion ordering/disordering. On the other hand, yeelimite ...

    • Synchrotron Pair Distribution Function analyses of Ye’elimite-based pastes 

      Cuesta-Garcia, Ana Maria; García-Aranda, Miguel Ángel; Santacruz-Cruz, Maria Isabel; Gomez-de-la-Torre, Maria de los Angeles; Zea-Garcia, Jesus D. (2018-10-15)
      The study of nanocrystalline phase atomic ordering is intrinsically complicated. The presence of additional crystalline phase(s) exacerbates this challenge. Here, we use the synchrotron pair distribution function (PDF) to ...

    • Synchrotron Radiation Pair Distribution Function Analysis of Gels in Cements 

      Cuesta-Garcia, Ana Maria; Zea-Garcia, Jesus D.; Londono-Zuluaga, Diana; Gomez-de-la-Torre, Maria de los Angeles; Santacruz-Cruz, Maria Isabel; [et al.] (MDPI, 2017)
      The analysis of atomic ordering in a nanocrystalline phase with small particle sizes, below 5 nm, is intrinsically complicated because of the lack of long-range order. Furthermore, the presence of additional crystalline ...