Now showing items 55-74 of 103

    • Linseed oil as a model system for surface enhanced Raman spectroscopy detection of degradation products in artworks 

      Gómez, Manuel; Reggio, Daniela; Lazzari, Massimo (Wiley, 2019)
      Early evidence of materials decay can provide diagnostic insights to conservators and scientists enhancing the overall knowledge on art materials. Limited knowledge is available on the long‐term behavior of synthetic and ...
    • Low-temperature spin excitations in frustrated ZnCr2O4 probed by high-field thermal conductivity 

      Zhou, Haidong; Zhao, Z. Y.; Sun, X. F.; Nieto Suárez, Marina; Rivas Murias, Beatriz; Tsurkan, Vladimir; Deisenhofer, Joachim; Zapf, Vivien; Rivadulla, Francisco (APS Physics, 2013)
      The magnetoelastic excitations of spin frustrated ZnCr2O4 are studied by the magnetic field dependence of the thermal conductivity k down to 50 mK. Above the first-order magnetostructural transition at TN,S≈ 12.5 K, spin ...
    • Magnetic Field Induced Transition in Vanadium Spinels 

      Mun, E.D.; Chern, Gia-Wei; Pardo, Victor; Rivadulla, Francisco; Sinclair, R.; Zhou, Haidong; Zapf, Vivien; Batista, Cristian D. (2014)
      We study vanadium spinels AV2O4 (A=Cd,Mg) in pulsed magnetic fields up to 65 T. A jump in magnetization at μ0H≈40 T is observed in the single-crystal MgV2O4, indicating a field induced quantum phase transition between ...
    • Methanol dimer formation drastically enhances hydrogen abstraction from methanol by OH at low temperature 

      Siebrand, Willem; Smedarchina, Zorka; Martínez Núñez, Emilio; Fernández-Ramos, Antonio (Royal Society of Chemistry, 2016-07-22)
      The kinetics of the reaction of methanol with hydroxyl radicals is revisited in light of the reported new kinetic data, measured in cold expansion beams. The rate constants exhibit an approximately 102-fold increase when ...
    • Microemulsións: un avance na obtención de fluídos magnéticos 

      López Pérez, José Antonio; López Quintela, Manuel Arturo; Mira Pérez, Jorge; Rivas Rey, José (Real Academia Galega de Ciencias, 1996)
      Neste traballo preséntase unha vía alternativa e totalmente orixinal de síntese de nanopartículas para a preparación de fluidos magnéticos, con mellaras respecto ós métodos tradicionais. Para elo, empréganse mezclas ...
    • A model for monomer and micellar concentrations in surfactant solutions: application to conductivity, NMR, diffusion, and surface tension data 

      Al-Soufi, Wajih; Piñeiro Maseda, Lucas; Novo Rodríguez, María de la Merced (Elsevier, 2012)
      An empirical model for the concentrations of monomeric and micellized surfactants in solution is presented as a consistent approach for the quantitative analysis of data obtained with different experimental techniques from ...
    • Moderately Strong Photoacid Dissociates in Alcohols with High Transient Concentration of the Proton-Transfer Contact Pair 

      Brenlla, Alfonso; Veiga Gutiérrez, Manoel; Ríos Rodríguez, M. Carmen; Rodríguez-Prieto, Flor; Mosquera González, Manuel; Pérez Lustres, José Luis (American Chemical Society, 2014)
      Proton transfer from strong photoacids to hydroxylic solvents is much under debate. Experimentally, the main issue stems from relaxation and diffusion processes that are concomitant with ultrafast proton transfer and blur ...
    • Multidimensional Hamiltonian for tunneling with position-dependent mass 

      Fernández-Ramos, Antonio; Smedarchina, Zorka; Siebrand, Willem (APS Physics, 2014-09-15)
      A multidimensional Hamiltonian for tunneling is formulated, based on the mode with imaginary frequency of the transition state as a reaction coordinate. To prepare it for diagonalization, it is transformed into a lower-dimension ...
    • Multidisciplinary approach to the transfection of plasmid DNA by a nonviral nanocarrier based on a Gemini-Bolaamphiphilic hybrid lipid 

      Martínez Negro, María; Guerrero Martínez, Andrés; García Río, Luis; Domènech, Òscar; Aicart, Emilio; Tros de Ilarduya, Conchita; Junquera, Elena (American Chemical Society, 2018)
      A multidisciplinary strategy, including bothbiochemical and biophysical studies, was proposed here toevaluate the potential of lipid nanoaggregates consisting of amixture of a gemini−bolaamphiphilic lipid (C6C22C6) and ...
    • New interpretation of proton and deuteron tunneling in 2'-methylacetophenone 

      Fernández-Ramos, Antonio; Siebrand, Willem; Smedarchina, Zorka (Elsevier, 2013-10-24)
      The enol–keto transition rate constants in 2′-methylacetophenone observed by Grellmann et al. are calculated from first principles. The results reinterpret the proposed mechanism and show that proton tunneling is preceded ...
    • Nonmonotonic evolution of the charge gap in ZnV2O4 under pressure 

      Kuntscher, Christine; Rabia, Kaneez; Forthaus, M.K.; Abd-Elmeguid, M. M.; Rivadulla, Francisco; Kato, Y.; Batista, Cristian D. (APS Physics, 2012)
      A2+V2O4 spinels provide a unique opportunity for studying the evolution of the charge gap of Mott insulators that approach the itinerant electron limit under the application of external pressure. Here we report ...
    • Novel Supramolecular Nanoparticles Derived From Cucurbit[7]uril and Zwitterionic Surfactants 

      Fernández Rosas, Josefa; Pessêgo, Márcia Isabel Duarte; Acuña, Angel; Vazquez-Vazquez, Carlos; Montenegro García, Javier; Parajo, Mercedes; Rodriguez-Dafonte, Pedro; Nome, Faruk; García Río, Luis (American Chemistry Society, 2018-02-12)
      Binding constants, Log K ≈ 6.6 M-1, and NMR characterization of the complexes formed by sulfobetaines and cucurbit[7]uril (CB7) support the electrostatic interaction as major driving force. This very strong binding motif ...
    • Novel synthetic routes of large-pore magnetic mesoporous nanocomposites (SBA-15/Fe3O4) as potential multifunctional theranostic nanodevices 

      Vargas Osorio, Zulema; González Gómez, Manuel Antonio; Piñeiro Redondo, Yolanda; Vázquez Vázquez, Carlos; Rodríguez Abreu, Carlos; López Quintela, Manuel Arturo; Rivas Rey, José (Royal Society of Chemistry, 2017)
      In this paper, novel magnetic silica nanocomposites were prepared by anchoring magnetite nanoparticles onto the outer surface of mesoporous SBA-15 silica; the magnetic nanoparticles were prepared by microemulsion and ...
    • Observation of nuclear-spin Seebeck effect 

      Kikkawa, Takashi; Reitz, Derek; Ito, H.; Makiuchi, Takahiko; Sugimoto, T.; Tsunekawa, K.; Daimon, Shunsuke; Oyanagi, Koichi; Ramos Amigo, Rafael Enrique; Takahashi, Satoshi; Shiomi, Yuki; Tserkovnyak, Yaroslav; Saitoh, Eiji (Nature Publishing Group, 2021)
      Thermoelectric effects have been applied to power generators and temperature sensors that convert waste heat into electricity. The effects, however, have been limited to electrons to occur, and inevitably disappear at low ...
    • On the Nature of σ–σ, σ–π, and π–π Stacking in Extended Systems 

      Cabaleiro Lago, Enrique Manuel; Rodríguez Otero, Jesús (American Chemical Society, 2018-08-17)
      Stacking interactions have been evaluated, employing computational methods, in dimers formed by analogous aliphatic and aromatic species of increasing size. Changes in stability as the systems become larger are mostly ...
    • Orbital, charge, and spin couplings in Ru 25+O9 dimers of Ba3CoRu2O9 

      Zhou, Haidong; Kiswandhi, Andhika; Barlas, Yafis; Brooks, James; Siegrist, Theo Max; Li, G.; Balicas, Luis; Cheng, J. G.; Rivadulla, Francisco (APS Physics, 2012)
      e magnetic, transport, and structural properties of cold-pressed Ba3CoRu2O9 show (i) an antiferromagnetic transition, (ii) a semiconductor-semiconductor electronic transition where the resistivity is dominated by the ...
    • Oxygen vacancies in strained SrTiO 3 thin films: Formation enthalpy and manipulation 

      Iglesias, L.; Sarantopoulos, Alexandros; Magén, Cesar; Rivadulla, Francisco (APS Physics, 2017)
      We report the enthalpy of oxygen vacancy formation in thin films of electron-doped SrTiO 3 , under different degrees of epitaxial stress. We demonstrate that both compressive and tensile strain decrease this energy at ...
    • Paramagnetic epoxy resin 

      Vázquez Barreiro, Eva Carolina; Fraga López, Francisco José; Jover Ramos, Aida; Meijide del Río, Francisco Ángel; Rodríguez Núñez, Eugenio Anselmo; Vázquez Tato, José (Budapest University of Technology, 2017)
      This work illustrates that macrocycles can be used as crosslinking agents for curing epoxy resins, provided that they have appropriate organic functionalities. As macrocycles can complex metal ions in their structure, ...
    • Photoinduced Proton and Charge Transfer in 2‑(2′- Hydroxyphenyl)imidazo[4,5‑b]pyridine 

      Brenlla, Alfonso; Veiga Gutiérrez, Manoel; Pérez Lustres, José Luis; Ríos Rodríguez, M. Carmen; Rodríguez-Prieto, Flor; Mosquera González, Manuel (American Chemical Society, 2013)
      This paper deals with the interplay between solvent properties and isomerism of 2-(2′-hydroxyphenyl)imidazo[4,5-b]pyridine (1), and the proton and charge-transfer processes that the different isomers undergo in the ...
    • Photophysical study of Thioflavin T as fluorescence marker of amyloid fibrils 

      Freire Rodríguez, Sonia; Araujo, Marcus H. de; Al-Soufi, Wajih; Novo Rodríguez, María de la Merced (Elsevier, 2014)
      Thioflavin T is a highly sensitive fluorescent marker of amyloid fibrils that has been widely used for in vitro biomedical assays. However, neither its complex photophysical behavior nor its binding mode to amyloid fibrils ...





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