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- 저자 : M.E. Díaz-García (검색결과 4 건)
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Puente-Martínez D. E.,Díaz-Guillén J. A.,González-García K. A.,Montemayor S. M.,Díaz-Guillén J. C.,Burciaga-Díaz O.,Bazaldúa-Medellín M. E.,Padmasree K. P. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.5
This research reports the synthesis, characterization, and electrical properties of the systems EryCe1−yO2−δ (y = 0.05, 0.1, and 0.15), and the effect of the incorporation of sintering aids (2 wt.% of CaO, MgO, and TiO2) on the electrical properties of the composition Er0.1Ce0.9O1.95, to be used as ceramic solid electrolytes in low-temperature solid oxide fuel cells (LT-SOFC). All EryCe1−yO2−δ samples were obtained by mechanochemistry (20 h of milling) and characterized by XRD. The morphology of the pure sintered compositions and with the incorporation of sintering aids (sintered at 1200 °C) was evaluated by FE-SEM. Electrical properties as a function of temperature (200–650 °C) and frequency (100 Hz–1 MHz) were evaluated by impedance spectroscopy. It reveals an increase of bulk ionic conductivity for higher contents of Er, as the number of oxygen vacancies increases. The higher value of conductivity (6.7 × 10–3 S cm−1) at 650 °C was for the composition Er0.15Ce0.85O1.925, while the ionic conductivity of Er0.1Ce0.9O1.95 at 650 °C increased from 2.68 × 10–3 S cm−1 to a maximum of 1.54 × 10–2 S cm−1 with the incorporation of CaO as additive. These improvements in bulk ionic conductivities can contribute to the development of more efficient electrolytes for the LT-SOFC technology.
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Electronic transport study of PbSe pellets prepared from self-assembled 2D-PbSe nanostructures
E. Díaz-Torres,A. Flores-Conde,A. Avila-García,M. Ortega-Lopez 한국물리학회 2018 Current Applied Physics Vol.18 No.2
This work presents a study of the electronic transport properties of PbSe pellets fabricated starting of PbSe nanostructures that exhibited a flake-like 2D morphology, which were synthesized by the coprecipitation method. Seebeck coefficient measurements revealed that the PbSe sample displays ntype conductivity, a maximum Seebeck coefficient of 512.6 mV/K around 380 K, and that the carriers scattering is dominated by acoustic and optical phonons. The Fermi level dependence on the temperature and the band gap energy are also reported. Interestingly, size-dependent confinement effects due probably to the reminiscent PbSe 2D character could be evidenced.
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Neural Mechanisms in Eating Behaviors: A Pilot fMRI Study of Emotional Processing
Rosa M. Molina-Ruiz,T. García-Saiz,Jeffrey C.L. Looi,E. Via Virgili,M. Rincón Zamorano,Laura de Anta Tejado,Helena Trebbau López,Jose Luis Carrasco Perera,Marina Díaz-Marsá 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.3
Objective Emotional processing dysfunction evident in eating disorders (ED) such as anorexia nervosa (AN) and bulimia nervosa (BN), is considered relevant to the development and maintenance of these disorders. The purpose of the current functional magnetic resonance imaging (fMRI) study was to pilot a comparison of the activity of the fronto-limbic and fronto-striatal brain areas during an emotion processing task in persons with ED. Methods 24 women patients with ED were scanned, while showing emotionally stimulating (pleasant, unpleasant) and neutral images from the International Affective Picture System (IAPS). Results During the pleasant condition, significant differences in Dorsolateral Prefrontal Cortex (DLPFC) activations were found with AN participants presenting greater activation compared to BN and ED comorbid groups (EDc) and healthy controls also showing greater activation of this brain area compared to BN and EDc. Left putamen was less activated in EDc compared to both controls (C) and AN. During the unpleasant condition, AN participants showed hyperactivation of the Orbito-Frontal Cortex (OFC) when compared to EDc. Conclusion This study highlights the potential functional relevance of brain areas that have been associated with self-control. These findings should help advance understanding the neural substrate of ED, though they should be considered as preliminary and be cautiously interpreted.
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New metal-free nanolubricants based on carbon-dots with outstanding antiwear performance
C. Chimeno-Trinchet,M.E. Pacheco,A. Fernández-González,M.E. Díaz-García,R. Badía-Laíño 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
Nanoparticles have already demonstrated a good performance in improving the wear and/or coefficientof friction when used as nanolubricants. Nevertheless, they show two main drawbacks: most of them aremetal-based and, therefore, eco-unfriendly, and they are mostly hydrophilic and, consequently, unstablein organic media, whichfinally drives to aggregation/sedimentation and the loose of the good properties. In this work, we carry out the synthesis of carbon-based nanoparticles for additives in lubricants fromtwo different approaches: either using ionic liquids as carbons source, or using glutathione as carbonsource and decorating the so-obtained carbon dots with the big organic cations of the ionic liquid. Thefinal materials (diameters between 2.2 and 3.5 nm) were characterized by TEM, FTIR, XPS, andluminescent methodologies,finding long-term stability of the suspensions in organic media ( 15 days). Carbon dots obtained directly from the ionic liquids, in particular from methyltrioctylammoniumchloride (MTOACDs) have demonstrated to be the best candidate as additive in different base oils (0.1%,w/v) and lubrication regimes, reducing the coefficient of friction about 30% and wear scar in more than60% in the most extreme of the tested conditions (120 N). Additionally, nanolubricants are metal-free andtherefore, more eco-friendly than classic additives.
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