Exploració per autor "Macovez, Roberto"Més informacióMés informació

Ara es mostren els items 28-47 de 48

    • Phase-selective conductivity enhancement and cooperativity length in PLLA/TPU nanocomposite blends with carboxylated carbon nanotubes 

      Valenti, Sofia; Yousefzade, Omid; Puiggalí Bellalta, Jordi; Macovez, Roberto (Elsevier, 2020-03-16)
      Article
      Accés obert
      Transmission electron microscopy, temperature-modulated differential scanning calorimetry, and broadband dielectric spectroscopy were employed to characterize ternary nanocomposites consisting of carboxylated carbon nanotubes ...

    • Physical properties of organic fullerene cocrystals 

      Macovez, Roberto (2018-01-04)
      Article
      Accés obert

    • 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
      Accés obert
      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
      Accés restringit per política de l'editorial
      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 vs crystallization kinetics in the amorphous state: the case of Stiripentol 

      Ruiz, Guadalupe N.; Romanini, Michela; Barrio Casado, María del; Tamarit Mur, José Luis; Pardo Soto, Luis Carlos; Macovez, Roberto (2017-11-06)
      Article
      Accés obert
      With the aim of finding a correlation between the crystallization kinetics and the molecular dynamics of a substance that would allow prediction of its crystallization time as a function of temperature for a given a ...

    • Segmental relaxation and partial crystallization of chain-extended Poly(l-lactic acid) reinforced with carboxylated carbon nanotube 

      Yousefzade, Omid; Valenti, Sofia; Puiggalí Bellalta, Jordi; Garmabi, Hamid; Macovez, Roberto (2019-02-15)
      Article
      Accés obert
      Temperature-modulated differential scanning calorimetry (TMDSC) and broadband dielectric spectroscopy (BDS) were employed to study the glass transition, size of the cooperative rearranging regions (CRRs), crystallization ...

    • Self-Diffusion, Phase Behavior, and Li+ Ion Conduction in Succinonitrile-Based Plastic Cocrystals 

      Zachariah, Manesh; Romanini, Michela; Tripathi, Pragya; Barrio Casado, María del; Tamarit Mur, José Luis; Macovez, Roberto (2015-11-11)
      Article
      Accés obert
      We study the temperature-dependent molecular dynamics, ion conduction, and phase behavior of plastic-crystal electrolytes based on the succinonitrile molecule. We employ calorimetry and dielectric spectroscopy to probe ...

    • Silicon-Chip-Based Dielectric Spectroscopy for Conductivity and Molecular Dynamics Studies of Organic Films 

      Tripathi, Pragya; Gonzalo Ruiz, Javier; Mitsari, Efstratia; Zachariah, Manesh; Romanini, Michela; Tamarit Mur, José Luis; Muñoz Berbel, F. Xavier; Macovez, Roberto (2014-07-29)
      Article
      Accés restringit per política de l'editorial
      Interdigital electrodes fabricated by standard lithography on silicon chips are employed to probe the dipolar molecular dynamics and electric conduction properties of thin rhodamine films grown with two different methods. ...

    • Simultaneous orientational and conformational molecular dynamics in solid 1,1,2-Trichloroethane 

      Romanini, Michela; Mitsari, Efstratia; Tripathi, Pragya; Serra, Pablo; Zuriaga, Jose Mariano; Tamarit Mur, José Luis; Macovez, Roberto (2018-03-15)
      Article
      Accés obert
      The molecular dynamics in the ambient-pressure solid phase of 1,1,2-trichloroethane is studied by means of broadband dielectric spectroscopy and molecular dynamics simulations. The dielectric spectra of polycrystalline ...

    • Solid state physicochemical properties and applications of organic and metallo-organic fullerene derivatives 

      Mitsari, Efstratia; Romanini, Michela; Manesh, Zachariah; Macovez, Roberto (2016)
      Article
      Accés obert
      We review the fundamental properties and main applications of organic derivatives and complexes of fullerenes in the solid-state form. We address in particular the structural properties, in terms of crystal structure, ...

    • Structure and dynamics of the crystalline stable phase of 2-Chlorothiophene 

      Romanini, Michela; Negrier, Philippe; Barrio Casado, María del; Mondieig, Denise; Serra, Pablo; Zuriaga, Jose Mariano; Macovez, Roberto; Tamarit Mur, José Luis (2019-09-23)
      Article
      Accés obert
      The dynamics of a simple and rigid molecule (2-chlorothiophene) has been studied by means of broadband dielectric spectroscopy (BDS) within the low-temperature stable crystalline phase, whose structure has been determined ...

    • Structure and reorientational dynamics of 1-F-adamantane 

      Ben Hassine, Bacem; Negrier, Philippe; Romanini, Michela; Barrio Casado, María del; Macovez, Roberto; Kallel, A.; Mondieig, Denise; Tamarit Mur, José Luis (2016-03-17)
      Article
      Accés obert
      The polymorphism and the dynamics of a simple rigid molecule (1-fluoro-adamantane) have been studied by means of X-ray powder diffraction and broadband dielectric spectroscopy. At temperatures below the melting point, the ...

    • Surface hubbard U of alkali fullerides 

      Macovez, Roberto (2011)
      Article
      Accés restringit per política de l'editorial
      Wereport a combined photoemission spectroscopy (PES) and inverse photoemission spectroscopy (IPES) study of distilled, phase pure films of C60 and the monomeric fullerides Cs6C60, Cs4C60 and fcc RbC60. The separation ...

    • Thermodynamic scaling of the dynamics of a strongly hydrogen-bonded glass-former 

      Romanini, Michela; Barrio Casado, María del; Macovez, Roberto; Ruíz Martín, María Dolores; Capaccioli, Simon; Tamarit Mur, José Luis (Macmillan Publishers, 2017-12-01)
      Article
      Accés obert
      We probe the temperature- and pressure-dependent specific volume (v) and dipolar dynamics of the amorphous phase (in both the supercooled liquid and glass states) of the ternidazole drug (TDZ). Three molecular dynamic ...

    • Tuning molecular dynamics by hydration and confinement: Antiplasticizing effect of water in hydrated prilocaine nanoclusters 

      Ruiz Tabbia, Guadalupe Natalia; Combarro Palacios, Izaskun; McLain, Sylvia E.; Schwartz, Gustavo Ariel; Pardo Soto, Luis Carlos; Cerveny Murcia, Silvina; Macovez, Roberto (Royal Society of Chemistry (RSC), 2019-01-01)
      Article
      Accés obert
      In glass-forming substances, the addition of water tends to produce the effect of lowering the glass transition temperature, Tg. In a previous work by some of us (Ruiz et al., Sci. Rep., 2017, 7, 7470) we reported on a ...

    • Tuning the Kinetic Stability of the Amorphous Phase of the Chloramphenicol Antibiotic 

      Valenti, Sofia; Romanini, Michela; Franco García, María Lourdes; Puiggalí Bellalta, Jordi; Tamarit Mur, José Luis; Macovez, Roberto (2018-10-23)
      Article
      Accés obert
      We employ broadband dielectric spectroscopy to study the relaxation dynamics and crystallization kinetics of a broad-spectrum antibiotic, chloramphenicol, in its supercooled liquid form. Two dynamic processes are observed: ...

    • Ultraslow dynamics of water in organic molecular solids 

      Macovez, Roberto; Mitsari, Efstratia; Zachariah, Manesh; Romanini, Michela; Zygouri, Panagiota; Gournis, Dimitrios; Tamarit Mur, José Luis (2014-03-06)
      Article
      Accés restringit per política de l'editorial
      The relaxation dynamics of water in hygroscopic molecular solids is probed by broadband dielectric spectroscopy in the temperature range from 200 to 450 K. Evidence is found for three types of dynamic processes. The ...

    • Uniaxial negative thermal expansion in polymorphic 2-bromobenzophenone, due to aromatic interactions? 

      Romanini, Michela; Rietveld, Ivo B.; Barrio Casado, María del; Negrier, Philippe; Mondieig, Denise; Macovez, Roberto; Céolin, René; Tamarit Mur, José Luis (American Chemical Society, 2021-04-07)
      Article
      Accés obert
      The structure of the metastable form II of 2-bromobenzophenone, obtained by crystallization from the melt, has been determined by powder X-ray diffraction. Form II has been solved in the centrosymmetric monoclinic space ...

    • Variable-range electron hopping, conductivity cross-over and space-charge relaxation in C60Br6 

      Manesh, Zachariah; Romanini, Michela; Zygouri, Panagiota; Gournis, Dimitrios; Tamarit Mur, José Luis; Barrio Casado, María del; Macovez, Roberto (2016-07-01)
      Article
      Accés obert
      Dielectric spectroscopy is employed to probe the frequency-dependent conductivity and dipolar dielectric response of solid C60Br6. Below approximately 215 K, charge conduction is electronic and well described by Mott's ...

    • Water-triggered conduction and polarization effects in a hygroscopic fullerene salt 

      Zachariah, Manesh; Tripathi, Pragya; Mitsari, Efstratia; Romanini, Michela; Zygouri, Panagiota; Gournis, Dimitrios; Barrio Casado, María del; Tamarit Mur, José Luis; Macovez, Roberto (2014)
      Comunicació de congrés
      Accés obert
      Impedance spectroscopy is employed to probe the frequency-dependent conductivity and dielectric response of the crystalline C60O24Na24 fulleride, both in its pure form obtained by heating to 473 K and in its bulk-hydrate ...