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Browsing by Subject "Graphene"

Now showing items 1-20 of 43

Acoustic analogue of graphene: observation of Dirac cones in acoustic surface waves

Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José (American Physical Society, 2012-04-27)

We demonstrate the presence of Dirac cones in the dispersion relation of acoustic waves propagating on the surface of a plate of methyl methacrylate containing a honeycomb lattice of cylindrical boreholes. This structure ...
Al2O3-3YTZP-Graphene multilayers produced by tape casting and spark plasma sintering

Rincón, Acacio; Moreno, Rodrigo; Chinelatto, Adriana S. A.; Gutierrez-Gonzalez, Carlos F.; Rayón Encinas, Emilio; Salvador Moya, Mª Dolores; Borrell Tomás, María Amparo (Elsevier, 2014-09)

This work aims to establish a colloidal route to obtain laminates of alumina zirconia combining layers with and without graphene. Green tapes of alumina, alumina with 5 vol.% of 3Y-TZP and alumina with 5 vol.% of 3Y-TZP ...
Análisis por microscopía electroquímica de barrido de superficies electroactivas y desarrollo-caracterización de electrodos basados en un tejido de fibra de carbono

Fernández Sáez, Javier (Editorial Universitat Politècnica de València, 2014-06-19)

Una parte importante del trabajo desarrollado en la presente tesis está basado en la puesta a punto y aplicación de la técnica de la microscopía electroquímica de barrido (SECM). Con esta técnica se han caracterizado ...
Aplicación de grafeno como material componente de morteros

Cordero Carmona, Néstor (2015-10-13)

[ES] El presente trabajo fin de grado se basa en el estudio del comportamiento de morteros convencionales y morteros autonivelantes con adición nanofibras de grafeno (NFG). La realización del trabajo se ha dividido en tres ...
Bimetallic Oriented (Au/Cu2O) vs. Monometallic 1.1.1 Au (0) or 2.0.0 Cu2O Graphene-Supported Nanoplatelets as Very Efficient Catalysts for Michael and Henry Additions

Simion, Andrada; Candu, Natalia; Coman, Simona M.; Primo Arnau, Ana Maria; Esteve-Adell, Iván; Michelet, Veronique; Parvulescu, Vasile I.; García Gómez, Hermenegildo (John Wiley & Sons, 2018-12-02)

[EN] Michael and Henry addition reactions have been investigated using mono (Au and Cu2O) and bimetallic nanoplatelets (Au/Cu2O) grafted onto few-layers graphene (fl-G) films as heterogeneous catalysts by comparison with ...
Chemical and electrochemical study of fabrics coated with reduced graphene oxide

Molina Puerto, Javier; Fernández Sáez, Javier; Del Río García, Ana Isabel; Bonastre Cano, José Antonio; Cases Iborra, Francisco Javier (Elsevier, 2013-08-15)

Polyester fabrics coated with reduced graphene oxide (RGO) have been obtained and later characterized by means of chemical and electrochemical techniques. X-ray photoelectron spectroscopy showed a decrease of the oxygen ...
Colloidal processing of fully stabilized zirconia laminates comprising graphene oxide-enriched layers

Rincón, Acacio; Moreno, Rodrigo; Gutierrez González, Fidel Carlos; Sainz, Raquel; Salvador Moya, Mª Dolores; Borrell Tomás, María Amparo (Elsevier, 2016-06)

Multilayer materials have demonstrated to provide an efficient mechanism for toughening by deflection of a propagating crack by weak interlayers. Therefore, the aim of this work is to study the colloidal processing of 8 ...
Copper Nanoparticles Supported on Doped Graphenes as Catalyst for the Dehydrogenative Coupling of Silanes and Alcohols

Blandez Barradas, Juan Francisco; Primo Arnau, Ana María; Asiri, Abdullah; Alvaro Rodríguez, Maria Mercedes; García Gómez, Hermenegildo (Wiley-VCH Verlag, 2014-11-10)

[EN] Copper nanoparticles (NPs) supported on a series of undoped and doped graphene materials (Gs) have been obtained by pyrolysis of alginate or chitosan biopolymers, modified or not with boric acid, containing Cu2+ ...
Desarrollo de estructuras tipo sándwich de materiales compuestos ZnAl ZDH modificados con grafeno en matriz de polipirrol para aplicaciones en supercondensadores.

Bled, Héloïse (2020-02-20)

[ES] La necesidad de buscar alternativas a los combustibles fósiles es una de los principales preocupaciones de la comunidad científica en la actualidad. Los supercondensadores son unos dispositivos que tienen la capacidad ...
Effect of graphene and CNFs addition on the mechanical and electrical properties of dense alumina-toughened zirconia composites

Rincón, Acacio; Moreno, Rodrigo; Chinelatto, Adriana S. A.; Gutierrez, Carlos F.; Salvador Moya, Mª Dolores; Borrell Tomás, María Amparo (Elsevier, 2016-01)

Fully dense carbon/alumina-toughened zirconia composites were prepared by using a combination of aqueous colloidal powder processing and spark plasma sintering technique (SPS). Various carbon elements were introduced in ...
Electro-refraction modulation predictions for silicon graphene waveguides in the 1540-1560 nm region

Pérez-López, Daniel; Doménech Gómez, José David; Muñoz Muñoz, Pascual; Capmany Francoy, José (Institute of Electrical and Electronics Engineers (IEEE), 2016-10)

We derive analytical approximations for the variation of the effective indices of the fundamental transverse electric (TE) and transverse magnetic (TM) modes with the chemical potential of graphene in three common types ...
Electrochemical characterization of electrochemically reduced graphene coatings on platinum. Electrochemical study of dye adsorption

Molina Puerto, Javier; Fernández Sáez, Javier; García Albert, Carolina; Del Río García, Ana Isabel; Bonastre Cano, José Antonio; Cases Iborra, Francisco Javier (Elsevier, 2015-06-01)

Reduced graphene oxide coatings were synthesized by cyclic voltammetry on Pt electrodes. Electrochemically reduced graphene oxide was analyzed by scanning electrochemical microscopy for the first time. The redox mediator ...
Electrochemical characterization of reduced graphene oxide-coated polyester fabrics

Molina Puerto, Javier; Fernández Sáez, Javier; Inés Vilches, Juan Carlos; Del Río García, Ana Isabel; Bonastre Cano, José Antonio; Cases Iborra, Francisco Javier (Elsevier, 2013-03-30)

Reduced graphene oxide (RGO) coated fabrics were obtained by chemical reduction of GO on polyester (PES) fabrics. Conducting fabrics that have different applications were obtained by applying several layers of RGO. ...
Electroconductivity of Al2O3/graphene nanocomposite processed by SPS technique

Sánchez Bolinches, Alejandro; Klyatskina, Elizaveta; Segovia-López, Francisco; Zholnin, A.G.; Stolyarov, Vladimir V. (IOP Publishing, 2019)

[EN] Electrical conductivity (rho), relative dielectric permittivity (epsilon) and dissipation factor (D) measured in graphene-alumina composites. Samples obtained by plasma spark sintering (SPS) from a mixture of raw ...
Electrospun Poly(ethylene-co-vinyl alcohol)/Graphene Nanoplatelets Composites of Interest in Intelligent Food Packaging Applications

Torres-Giner, S.; Echegoyen, Y.; TERUEL JUANES, ROBERTO; Badia, Jose D.; Ribes-Greus, A.; Lagaron Cabello, José María (MDPI AG, 2018-09-20)

[EN] Graphene nanoplatelets (GNPs) were synthetized from graphite powder and, thereafter, embedded in poly(ethylene-co-vinyl alcohol) (EVOH) fibers by electrospinning in the 0.1-2 wt.-% range. The morphological, chemical, ...
Estudio de fotocatalizadores basados en grafeno con defectos para la producción de combustibles solares.

García Mulero, Ana (2019-04-11)

[ES] La disminución de las reservas de combustibles fósiles y el calentamiento global presenta un futuro alarmante para nuestro planeta. Es por esto por lo que se ha puesto una especial atención a los combustibles solares ...
Estudio de la actividad y estabilidad de fotoelectrodos basados en grafenos dopados para la producción de hidrógeno.

Navarro Gázquez, Pedro José (2019-09-02)

[ES] El objetivo del presente Trabajo Fin de Máster (TFM) es estudiar la eficiencia de fotoelectrodos preparados a base de grafeno dopado para la producción fotoelectroquímica de hidrógeno a partir de agua. Además, se ...
Estudio de la producción fotoelectrocatalítica de hidrógeno a partir del agua empleando materiales basados en grafeno.

Herpt Valdivia, Javier Van (2019-10-15)

[ES] El trabajo a realizar consistirá en la preparación de fotoelectrodos basados en grafeno a partir de biopolímeros obtenidos de desechos de biomasa. Estos fotoelectrodos se caracterizarán empleando técnicas espectroscópicas, ...
Generación fotocatalítica de hidrógeno a partir de mezclas agua/metanol usando como sensibilizador grafenos halogenados.

García Baldoví, Hermenegildo (2014-05-12)

[ES] Se trata de utilizar un Grafeno reconstituido a partir de Oxido de Grafeno mediante la introduccion de halogenos por enlace covalente y asi modular su banda de conduccion y utilizarlo para generar Hidrogeno ...
Graphene from Alginate Pyrolysis as a Metal-Free Catalyst for Hydrogenation of Nitro Compounds

Trandafir, Mihaela-Mirela; Florea, Mihaela; Neatu, Florentina; Primo Arnau, Ana Maria; García Gómez, Hermenegildo; Parvulescu, Vasile I. (John Wiley & Sons, 2016)

[EN] Graphene obtained by pyrolysis of alginate at 900 degrees C under inert atmosphere and exfoliation is used as a metal-free catalyst for reduction of nitro to amino groups with hydrogen as a reagent. The process is ...