Now showing items 1-20 of 36

    • Amorphous binary dispersions of chloramphenicol in enantiomeric pure and racemic poly-lactic acid: morphology, molecular relaxations, and controlled drug release 

      Valenti, Sofia; Díaz Andrade, Angélica María; Romanini, Michela; Valle Mendoza, Luis Javier del; Puiggalí Bellalta, Jordi; Tamarit Mur, José Luis; Macovez, Roberto (2019-09-10)
      Article
      Open Access
      We study amorphous solid dispersions (ASDs) of the chloramphenicol antibiotic in two biodegradable polylactic acid polymers, namely a commercial sample of enantiomeric pure PLLA and a home-synthesized PDLLA copolymer, to ...
    • C60 solvate with (1,1,2)-trichloroethane: dynamic statistical disorder and mixed conformation 

      Mitsari, Efstratia; Romanini, Michela; Qureshi, Navid; Tamarit Mur, José Luis; Barrio Casado, María del; Macovez, Roberto (2016-05-27)
      Article
      Open Access
      We present a full characterization of the orientationally disordered cocrystal of C-60 with (1,1,2)-triChloroethane (C2H3Cl3), by means of X-ray diffraction, Raman spectroscopy, and broadband dielectric spectroscopy. Our ...
    • Collective relaxation dynamics and crystallization kinetics of the amorphous Biclotymol antiseptic 

      Tripathi, Pragya; Romanini, Michela; Tamarit Mur, José Luis; Macovez, Roberto (2015-11-10)
      Article
      Open Access
      We employ dielectric spectroscopy to monitor the relaxation dynamics and crystallization kinetics of the Biclotymol antiseptic in its amorphous phase. The glass transition temperature of the material as determined by ...
    • Double primary relaxation in a highly anisotropic orientational glass-former with low-dimensional disorder 

      Romanini, Michela; Barrio Casado, María del; Capaccioli, Simon; Ruíz Martín, María Dolores; Macovez, Roberto; Tamarit Mur, José Luis (2016-04-26)
      Article
      Open Access
      The freezing of the cooperative reorientational motions in orientationally disordered (OD) molecular crystals marks the so-called \glassy" transition, which may be considered a lower-dimensional version of the structural ...
    • Emergence of glassy-like dynamics in an orientationally ordered phase 

      Romanini, Michela; Negrier, Philippe; Tamarit Mur, José Luis; Capaccioli, Simon; Barrio Casado, María del; Pardo Soto, Luis Carlos; Mondieig, Denise (2012-04-04)
      Article
      Open Access
      The dynamics of a simple rigid pseudoglobular molecule (2-adamantanone) has been studied by means of dielectric spectroscopy and examined under the constraints imposed by the space group of the crystal structure determined ...
    • Enhancement of the physical and chemical stability of amorphous drug-polymer mixtures via cryogenic comilling 

      Romanini, Michela; Lorente, Marta; Schammé, Benjamin; Delbreilh, Laurent; Dupray, Valérie; Coquerel, Gerard; Tamarit Mur, José Luis; Macovez, Roberto (American Chemical Society (ACS), 2018-11-27)
      Article
      Open Access
      Amorphous dispersions of the Biclotymol antiseptic are obtained in polyvinylpyrrolidone (PVP), for different drug loadings, by comilling at temperatures below the glass transition of both components. Characterization of ...
    • Genuine antiplasticizing effect of water on a glass-former drug 

      Ruiz Tabbia, Guadalupe Natalia; Romanini, Michela; Hauptmann, Astrid; Loerting, Thomas; Shalaev, Evgenyi; Tamarit Mur, José Luis; Pardo Soto, Luis Carlos; Macovez, Roberto (Macmillan Publishers, 2017-08-07)
      Article
      Open Access
      Water is the most important plasticizer of biological and organic hydrophilic materials, which generally exhibit enhanced mechanical softness and molecular mobility upon hydration. The enhancement of the molecular dynamics ...
    • Giant and reversible barocaloric effect in trinuclear spin-crossover complex Fe3(bntrz)6(tcnset)6 

      Romanini, Michela; Lloveras Muntané, Pol Marcel; Barrio Casado, María del; Aznar Luque, Araceli; Gracia Condal, Adrià; Emre, Baris; Tamarit Mur, José Luis; Planes Vila, Antoni; Manosa, L (2021-03)
      Article
      Open Access
      A giant barocaloric effect (BCE) in a molecular material Fe3(bntrz)6(tcnset)6 (FBT) is reported, where bntrz = 4-(benzyl)-1,2,4-triazole and tcnset = 1,1,3,3-tetracyano-2-thioethylepropenide. The crystal structure of FBT ...
    • Giant barocaloric effects over a wide temperature range in the superionic conductor AgI 

      Aznar Luque, Araceli; LLoveras, Pol; Romanini, Michela; Barrio Casado, María del; Tamarit Mur, José Luis; Cazorla Silva, Claudio; Errandonea Ponce, Daniel; Mathur, N.D.; Planes, Antoni; Moya, Xavier; Mañosa Carrera, Lluis (2017-11-29)
      Article
      Open Access
      Current interest in barocaloric effects has been stimulated by the discovery that these pressure-driven thermal changes can be giant near ferroic phase transitions in materials that display magnetic or electrical order. ...
    • Hopping conductivity and polarization effects in a fullerene derivative salt 

      Macovez, Roberto; Zachariah, Manesh; Romanini, Michela; Zygouri, Panagiota; Gournis, Dimitrios; Tamarit Mur, José Luis (2014-06-12)
      Article
      Restricted access - publisher's policy
      Impedance spectroscopy is employed to probe the frequency-dependent conductivity and dielectric response of the C60O24Na 24 fulleride. The conduction properties of this organic material match the so-called universal behavior ...
    • Implanted muon spin spectroscopy on 2-O-adamantane: a model system that mimics the liquid 

      Romanini, Michela; Tamarit Mur, José Luis; Pardo Soto, Luis Carlos; Bermejo, F. J.; Fernandez Perea, Ricardo; Pratt, F. L. (2017-03-01)
      Article
      Open Access
      The transition taking place between two metastable phases in 2-O-adamantane, namely the [Formula: see text] cubic, rotator phase and the lower temperature P21/c, Z  =  4 substitutionally disordered crystal is studied by ...
    • Mixtures of m-fluoroaniline with apolar aromatic molecules: Phase behaviour, suppression of H-bonded clusters, and local H-bond relaxation dynamics 

      Romanini, Michela; Barrio Casado, María del; Macovez, Roberto; Capaccioli, Simon; Tamarit Mur, José Luis (2019-12-15)
      Article
      Restricted access - publisher's policy
      We employ differential scanning calorimetry, IR spectroscopy, X-ray powder diffraction and dielectric spectroscopy to characterize binary mixtures of m-fluoroaniline (mFA), a rigid-molecule glass former, with two ...
    • Molecular diffusion and dc conductivity perfectly correlated with molecular rotational dynamics in a plastic crystalline electrolyte 

      Zachariah, Manesh; Romanini, Michela; Tripathi, Pragya; Tamarit Mur, José Luis; Macovez, Roberto (2015-01-01)
      Article
      Open Access
    • Nose temperature and anticorrelation between recrystallization kinetics and molecular relaxation dynamics in amorphous morniflumate at high pressure 

      Romanini, Michela; Valenti, Sofia; Barrio Casado, María del; Tamarit Mur, José Luis; Macovez, Roberto; Rodríguez Martín, Sergio (2019-07-05)
      Article
      Open Access
      We probe the dielectric response of the supercooled liquid phase of Morniflumate, a drug with anti-inflammatory and antipyretic properties, studying in particular the pressure and temperature dependence of the relaxation ...
    • Orientational relaxations in solid (1,1,2,2)tetrachloroethane 

      Tripathi, Pragya; Mitsari, Efstratia; Romanini, Michela; Serra, Pablo; Tamarit Mur, José Luis; Zuriaga, Jose Mariano; Macovez, Roberto (2016)
      Article
      Open Access
      We employ dielectricspectroscopy and molecular dynamic simulations to investigate the dipolar dynamics in the orientationally disordered solid phase of (1,1,2,2)tetrachloroethane. Three distinct orientational dynamics are ...
    • Polymorphism of 1,3-X-adamantanes (X = Br, OH, CH3) and the crystal plastic phase formation ability 

      Negrier, Philippe; Ben Hassine, Bacem; Barrio Casado, María del; Romanini, Michela; Mondieig, Denise; Tamarit Mur, José Luis (2020-02-21)
      Article
      Open Access
      The polymorphism of 1,3-dimethyladamantane (13DMA), 1,3-adamantanediol (13DOHA) and 1,3-dibromoadamantane (13DBrA) has been studied by X-ray powder diffraction, density measurements and differential scanning calorimetry ...
    • Polymorphism of 2-Adamantanone 

      Negrier, Philippe; Barrio Casado, María del; Romanini, Michela; Tamarit Mur, José Luis; Mondieig, Denise; Krivchikov, Alexander I; Kepinski, L.; Jezowski, Andrzej; Szewczyk, Daria (2014-05-07)
      Article
      Restricted access - publisher's policy
      The polymorphism of 2-adamantanone (C10H14O) has been investigated by means of X-ray diffraction and high-pressure thermal analysis. The intricate behavior of the low-temperature crystalline phases has been disentangled. ...
    • Polymorphism with conformational isomerism and incomplete crystallization in solid ethanolamine 

      Romanini, Michela; Negrier, Philippe; Tripathi, Pragya; Gournis, Dimitrios; Lira, Kyriaki-Marina; Barrio Casado, María del; Pardo Soto, Luis Carlos; Tamarit Mur, José Luis; Macovez, Roberto (2019-09-25)
      Article
      Open Access
      We employ calorimetry, Rietveld refinement of X-ray powder diffraction, broadband dielectric spectroscopy and molecular dynamics simulations, to investigate the phase behavior, crystal structure, dc conductivity and ...
    • Protonic surface conductivity and proton space-charge relaxation in hydrated fullerol 

      Mitsari, Efstratia; Romanini, Michela; Barrio Casado, María del; Tamarit Mur, José Luis; Macovez, Roberto (2017-03-09)
      Article
      Restricted access - publisher's policy
      The ac dielectric properties of both anhydrous fullerol (C-60(OH)(24)) and hydrated fullerol with 20% water mass content are investigated by means of temperature-dependent dielectric spectroscopy. Anhydrous polycrystalline ...
    • Relaxation dynamics in disordered systems 

      Romanini, Michela (Universitat Politècnica de Catalunya, 2015-07-22)
      Doctoral thesis
      Open Access
      The nature of the glass transition and of the glassy state is a fundamental and still unsolved problem of condensed matter physics. Many liquids can be supercooled below their melting point without crystallizing, that is, ...