Browsing by Author "Munoz Tavera, Enrique"
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- ItemChemical sensing with graphene: A quantum field theory perspective(2021) Horacio Falomir; Marcelo Loewe; Munoz Tavera, Enrique
- ItemComparative Thermoelectric Properties of Polypropylene Composites Melt-Processed Using Pyrograf® III Carbon Nanofibers(2023) Antonio J. Paleo; Dr. Beate Krause; Ana R. Mendes; Carlos Jose Tavares; Maria F. Cerqueira; Munoz Tavera, Enrique; Petra PötschkeThe electrical conductivity (σ) and Seebeck coefficient (S) at temperatures from 40 °C to 100 °C of melt-processed polypropylene (PP) composites filled with 5 wt.% of industrial-grade carbon nanofibers (CNFs) is investigated. Transmission Electron Microscopy (TEM) of the two Pyrograf® III CNFs (PR 19 LHT XT and PR 24 LHT XT), used in the fabrication of the PP/CNF composites (PP/CNF 19 and PP/CNF 24), reveals that CNFs PR 24 LHT XT show smaller diameters than CNFs PR 19 LHT XT. In addition, this grade (PR 24 LHT XT) presents higher levels of graphitization as deduced by Raman spectroscopy. Despite these structural differences, both Pyrograf® III grades present similar σ (T) and S (T) dependencies, whereby the S shows negative values (n-type character). However, the σ (T) and S (T) of their derivative PP/CNF19 and PP/CNF24 composites are not analogous. In particular, the PP/CNF24 composite shows higher σ at the same content of CNFs. Thus, with an additionally slightly more negative S value, the PP/CNF24 composites present a higher power factor (PF) and figure of merit (zT) than PP/CNF19 composites at 40 °C. Moreover, while the σ (T) and S (T) of CNFs PR 19 LHT XT clearly drive the σ (T) and S (T) of its corresponding PP/CNF19 composite, the S (T) of CNFs PR 24 LHT XT does not drive the S (T) observed in their corresponding PP/CNF24 composite. Thus, it is inferred in PP/CNF24 composites an unexpected electron donation (n-type doping) from the PP to the CNFs PR 24 LHT XT, which could be activated when PP/CNF24 composites are subjected to that increase in temperature from 40 °C to 100 °C. All these findings are supported by theoretical modeling of σ (T) and S (T) with the ultimate aim of understanding the role of this particular type of commercial CNFs on the thermoelectrical properties of their PP/CNF composites.
- ItemCorrections to the gyromagnetic factor in very special relativity(2022) Benjamin Koch; Munoz Tavera, Enrique; Alessandro Santoni
- ItemDislocation defect as a bulk probe of monopole charge of multi-Weyl semimetals(2020) Rodrigo Soto-Garrido; Munoz Tavera, Enrique; Vladimir Juričić
- ItemEarthquake Quantization(2024) Benjamin Koch; Munoz Tavera, EnriqueIn this homage to Einstein's 144th birthday we propose a novel quantization prescription, where the paths of a path-integral are not random, but rather solutions of a geodesic equation in a random background. We show that this change of perspective can be made mathematically equivalent to the usual formulations of non-relativistic quantum mechanics. To conclude, we comment on conceptual issues, such as quantum gravity coupled to matter and the quantum equivalence principle.
- ItemElectronic Features of Cotton Fabric e-Textiles Prepared with Aqueous Carbon Nanofiber Inks(2023) Antonio. J. Paleo; Beate Krause; Maria Fátima Cerqueira; Munoz Tavera, Enrique; Petra Pötschke; Ana Maria Rocha
- ItemFermion mass and width in QED in a magnetic field(2021) Alejandro Ayala; Jorge David Castaño-Yepes; M. Loewe; Munoz Tavera, Enrique
- ItemHigh-temperature phonon-mediated superconductivity in monolayer Mg2B4C2(2022) Sobhit Singh; Aldo H. Romero; José D. Mella; Vitalie Eremeev; Enrique Muñoz; Anastassia N. Alexandrova; Karin M. Rabe; David Vanderbilt; Munoz Tavera, Enrique
- ItemInteraction between two single superconducting vortices inside a superconducting hollow cylindrical domain(2019) Ovalle, D.G.; Munoz Tavera, Enrique; Benguria, R.D.
- ItemNonlinear Thermopower Behaviour of N-Type Carbon Nanofibres and Their Melt Mixed Polypropylene Composites(2022) Antonio J. Paleo; Beate Krause; Maria F. Cerqueira; Munoz Tavera, Enrique; Petra Pötschke; Ana M. Rocha
- ItemOptical Conductivity as a Probe of the Interaction-Driven Metal in Rhombohedral Trilayer Graphene(2022) Vladimir Juričić; Munoz Tavera, Enrique; Rodrigo Soto-Garrido
- ItemPath integral of the relativistic point particle in Minkowski space(2021) Benjamin Koch; Munoz Tavera, Enrique
- ItemQED fermions in a noisy magnetic field background(2023) Jorge David Castaño-Yepes; Marcelo Loewe; Munoz Tavera, Enrique; Juan Cristóbal Rojas; Renato Zamora
- ItemQED fermions in a noisy magnetic field background: The effective action approach(2023) Jorge David Castaño-Yepes; Marcelo Loewe; Munoz Tavera, Enrique; Juan Cristóbal Rojas
- ItemSensing Electrochemical Signals Using a Nitrogen-Vacancy Center in Diamond(2021) Munoz Tavera, EnriqueChemical sensors with high sensitivity that can be used under extreme conditions and can be miniaturized are of high interest in science and industry. The nitrogen-vacancy (NV) center in diamond is an ideal candidate as a nanosensor due to the long coherence time of its electron spin and its optical accessibility. In this theoretical work, we propose the use of an NV center to detect electrochemical signals emerging from an electrolyte solution, thus obtaining a concentration sensor. For this purpose, we propose the use of the inhomogeneous dephasing rate of the electron spin of the NV center (1/T2★) as a signal. We show that for a range of mean ionic concentrations in the bulk of the electrolyte solution, the electric field fluctuations produced by the diffusional fluctuations in the local concentration of ions result in dephasing rates that can be inferred from free induction decay measurements. Moreover, we show that for a range of concentrations, the electric field generated at the position of the NV center can be used to estimate the concentration of ions.
- ItemSpin-statistics connection in the framework of very special relativity: The massive case(2023) Alessandro Santoni; Munoz Tavera, Enrique; Benjamin Koch
- ItemThe aqueous processing of carbon nanofibers via cellulose nanocrystals as a green path towards e-textiles with n-type thermoelectric behaviour(2024) Víctor Calvo Peña; A.J. Paleo; J.M. González-Domínguez; Munoz Tavera, Enrique; B. Krause; P. Pötschke; W.K. Maser; A.M. Benito
- ItemThe breakdown of Moore’s law induced by weak Anderson localization and by size effects in nano-scale metallic connectors(2024) Claudio Arenas; Guillermo Herrera; Munoz Tavera, Enrique; Raul C Munoz
- ItemThe renormalized superperturbation theory (rSPT) approach to the Anderson model in and out of equilibrium(2024) Munoz Tavera, Enrique
- ItemThe role of morphology on the emergence of topologically trivial surface states and selection rules in topological-insulator nano-particles(2022) Jorge David Castaño-Yepes; Munoz Tavera, Enrique