Now showing items 21-40 of 47

    • 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
    • Molecular ¿(2) gratings via electron-beam lithography 

      Domínguez Juárez, Jorge Luis; Macovez, Roberto; Gonzalez, M.U.; Martorell Pena, Jordi (2010-07)
      Article
      Restricted access - publisher's policy
      We show that the nonlinear optical activity of an organic molecule may be quenched by electron irradiation. Exploiting this effect, we inscribe periodic χ(2) patterns in the molecular films by means of a scanning electron ...
    • New approaches for the fabrication of photonic structures of nonlinear optical materials 

      Carvajal, J J; Peña, A; Kumar, R.; Pujol, M. C.; Mateos, X.; Aguiló Díaz, Magdalena; Díaz, F; Vázquez De Aldana, J. R.; Méndez, Carlos Alberto; Moreno, P; Roso, L; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón; Král, Z; Ferré Borrull, J.; Pallarès Marzal, Josep; Marsal, L F; Finizio, Sergio Di; Martorell Pena, Jordi; Macovez, Roberto (2009-12)
      Article
      Restricted access - publisher's policy
      We revisited two different strategies to fabricate 1D photonic crystals of nonlinear optical dielectric materials based on ultrafast laser ablation of the surface of an RbTiOPO4 crystal, and selective etching of ferroelectric ...
    • 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 ...
    • On the microscopic origin of the cryoprotective effect in lysine solutions 

      Henao, Andrés; Ruiz Tabbia, Guadalupe Natalia; Steinke, Nicola; Cerveny Murcia, Silvina; Macovez, Roberto; Busch, Sebastian; McLain, Sylvia E.; Lorenz, Christian D.; Pardo Soto, Luis Carlos (2020-04-07)
      Article
      Open Access
      The amino acid lysine has been shown to prevent water crystallization at low temperatures in saturated aqueous solutions [S. Cerveny and J. Swenson, Phys. Chem. Chem. Phys., 2014, 16, 22382–22390]. Here, we investigate two ...
    • 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 ...
    • 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
      Open Access
      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
      Open Access
    • 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 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
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Open Access
      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 ...