3 research outputs found
Fabrication of high surface area ribbon electrodes for use in redox flow batteries via coaxial electrospinning
A method for the preparation of electrospun with fibers possessing a ribbon-like cross-sectional shape was developed. These materials could prove beneficial as flow-through electrodes, since ribbons provide a higher surface-to-volume ratio compared to fibers, thereby providing higher reactive surface area at a given porosity. Fabrication of these materials was accomplished by electrospinning a coaxial fiber with a polystyrene core and polyacrylonitrile shell, followed by leaching of the core material leading to the collapse of the shell into a flat ribbon. The surviving shell was then carbonized to make an electrically conductive and electrochemically reactive fibrous structure. Analysis by x-ray computed tomography showed that ribbons of approximately 400 nm Ă— 800 nm were produced, and experimental characterization revealed that they did indeed offer higher volumetric surface area than previously reported electrospun cylindrical fiber electrodes. The electrodes were characterized for various physical and transport properties and compared to commercial Freudenberg H23 carbon paper in terms of performance in a vanadium redox flow battery. The ribbon-based electrode had better performance and higher power density than commercial Freudenberg H23 electrode in the activation region, though suffered early onset of mass transfer limitations
Spectroscopic methods for the identification of sesquiterpene lactones
The most widely used spectroscopic methods for the identification ofsesquiterpene lactones are discussed. The most distinctive and characteristic signals in the UV, IR, MS, 1H-MNR and 13C-NMR spectra are discussed. In addition, some examples of the application of these techniques for the structure elucidation of some representative sesquiterpene lactones with different skeletal types are presented.Fil: SĂĽlsen, Valeria Patricia. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Oficina de CoordinaciĂłn Administrativa Houssay. Instituto de QuĂmica y Metabolismo del Fármaco. Universidad de Buenos Aires. Facultad de Farmacia y BioquĂmica. Instituto de QuĂmica y Metabolismo del Fármaco; ArgentinaFil: Donadel, Osvaldo Juan. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - San Luis. Instituto de Investigaciones en TecnologĂa QuĂmica. Universidad Nacional de San Luis. Facultad de QuĂmica, BioquĂmica y Farmacia. Instituto de Investigaciones en TecnologĂa QuĂmica; ArgentinaFil: Catalan, Cesar Atilio Nazareno. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Centro CientĂfico TecnolĂłgico Conicet - Tucumán. Instituto de QuĂmica del Noroeste. Universidad Nacional de Tucumán. Facultad de BioquĂmica, QuĂmica y Farmacia. Instituto de QuĂmica del Noroeste; Argentin