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Journal articles on the topic 'Oxygen Ion Conductors - Relaxation Dynamics'

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Published: 7 September 2023

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1

Li, Dan, Bo Wang, Pei Gong, Jie Li, and Xiang Hu Li. "Dielectric Relaxation Measurements in La1.94Ba0.06Mo2-yWyO9-δ (y=0, 1.0) Oxide-Ion Conductors." Applied Mechanics and Materials 662 (October 2014): 20–23. http://dx.doi.org/10.4028/www.scientific.net/amm.662.20.

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The influence of barium doping on the oxygen-ion diffusion and phase transition in the La2Mo2-yWyO9-δ (y=0, 1.0) oxide-ion conductors has been systematically investigated via dielectric techniques. In the Ba-doped La2Mo2O9 samples there are only two dielectric relaxation peaks Pd1 and Pd2, which are associated with the short-distance diffusion of oxygen vacancies. But in the Ba-doped La2MoWO9 members, three peaks are detected, including peak Pd1, Pd2, and peak Ph. The last is associated with the phase transition process from the static disordered state to the dynamic disordered state of oxygen ion/vacancy distribution.
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2

Wang, X. P., J. Hu, Zhong Zhuang, Tao Zhang, and Qian Feng Fang. "Internal Friction Study of the Rare Earth Ion Substituted Fast Oxide-Ion Conductors (La1-ΧreΧ)2Mo2O9 (Re=Nd, Gd)." Solid State Phenomena 184 (January 2012): 110–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.184.110.

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The relaxation and phase transition behaviors of rare-earth ion substituted fast oxide-ion conductors (La1-xRex)2Mo2O9 (Re=Nd, Gd) were investigated by internal friction (IF) measurement in the temperature range 300 K - 950 K. Three different IF peaks (labeled as PL, PH, and PG, respectively) were observed in the rare-earth ion doped La2Mo2O9 samples. Peak PL corresponds to short diffusion processes of oxygen ions among different oxygen vacancy sites. Peak PH is associated with the static/dynamic disorder transition in oxygen ion distribution. Peak PG is a newly discovered peak embodying phase transition-like characteristics and is suggested to be related to order-disorder transition associated with the rearrangement of La/ Re sub-lattice.
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3

Li, Dan, and Xiang Hu Li. "Influence of Tungsten Doping in La2Mo2O9 Oxide-Ion Conductors by Dielectric Relaxation Measurements." Applied Mechanics and Materials 130-134 (October 2011): 3302–5. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3302.

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The effects of tungsten doping in La2Mo2–yWyO9 (y =0, 0.25, 0.5, 1.0, 1.4) samples were studied using dielectric relaxation measurements. The results indicate that the solubility of W6+ in La2Mo2O9 sample is about 25mol%, W6+ can suppress the α/β phase transition in the La2Mo2O9. Additional to the low-temperature relaxation peak Pd associated with oxygen ion diffusion, a new dielectric loss peak Ph associated with a phase transition from the static disordered state to the dynamic disordered state of oxygen ion distribution was observed around 740 K. The conductivity of La2Mo1.9W0.1O9 sample is higher than that of the pure La2Mo2O9, and then decrease with the increasing of the tungsten doping in La2Mo2–yWyO9 (y = 0.5, 1.0) samples in the whole measurement temperature.
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Li, Dan, Jun Li, Chong Chen, Lin Qi, and Xiang Hu Li. "Dielectric Relaxation Measurements in La2Mo1.5W0.5O9 Oxide-Ion Conductor." Advanced Materials Research 952 (May 2014): 51–54. http://dx.doi.org/10.4028/www.scientific.net/amr.952.51.

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The effects of tungsten doping in La2Mo1.5W0.5O9 sample were studied using dielectric relaxation measurements. The results indicate that W6+ can suppress the α/β phase transition in the La2Mo2O9. Additional to the low-temperature relaxation peak Pd associated with oxygen ion diffusion, a new dielectric loss peak Ph associated with a phase transition from the static disordered state to the dynamic disordered state of oxygen ion distribution was observed around 740 K.
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5

Fang, Q. F., X. P. Wang, Z. S. Li, G. G. Zhang, and Z. G. Yi. "Relaxation peaks associated with the oxygen-ion diffusion in La2−xBixMo2O9 oxide-ion conductors." Materials Science and Engineering: A 370, no. 1-2 (April 2004): 365–69. http://dx.doi.org/10.1016/j.msea.2003.02.004.

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6

KILO, M. "Modeling of cation diffusion in oxygen ion conductors using molecular dynamics." Solid State Ionics 175, no. 1-4 (November 2004): 823–27. http://dx.doi.org/10.1016/j.ssi.2004.09.059.

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7

Frechero, M. A., O. J. Durá, M. R. Díaz-Guillén, K. J. Moreno, J. A. Díaz-Guillén, J. García-Barriocanal, A. Rivera-Calzada, A. F. Fuentes, and C. León. "Oxygen ion dynamics in pyrochlore-type ionic conductors: Effects of structure and ion–ion cooperativity." Journal of Non-Crystalline Solids 407 (January 2015): 349–54. http://dx.doi.org/10.1016/j.jnoncrysol.2014.08.046.

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8

Nowick, A. "Exploring the low-temperature electrical relaxation of crystalline oxygen-ion and protonic conductors." Solid State Ionics 136-137, no. 1-2 (November 2, 2000): 1307–14. http://dx.doi.org/10.1016/s0167-2738(00)00603-2.

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9

Fang, Qian Feng, X. P. Wang, Z. G. Yi, and Z. J. Cheng. "Relaxation Effects in La2Mo2O9-Based Oxide-Ion Conductors." Solid State Phenomena 115 (August 2006): 193–202. http://dx.doi.org/10.4028/www.scientific.net/ssp.115.193.

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The novel oxide-ion conductors (La1-xAx)2Mo2O9-δ (A = Ca, Bi, K, x = 0 ~ 0.075) are investigated in this paper by internal friction and dielectric relaxation techniques. Two relaxation peaks associated with the short-distance diffusion of oxygen vacancies were observed, indicating that there are at least two relaxation processes for diffusion of oxygen vacancies. Doping at La site with different elements shifts both relaxation peaks toward higher temperature and increases the activation energy of oxygen vacancy diffusion. In the case of internal friction, the height of the higher-temperature peak (dominant component) decreases with increasing doping content. In the case of dielectric relaxation, however, the variation of the peak heights as a function of doping content exhibits a maximum around 2.5 % K and 5 % Bi. After properly doping, the conductivity at low temperature of doped La2Mo2O9 increases by different degrees, and a peak of the conductivity at 500° C is observed in the doping content where the highest dielectric relaxation peak appears. Based on the experimental results and the crystalline structure, the mechanism of oxygen vacancy diffusion in (La1-xAx)2Mo2O9-δ samples is discussed.
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10

Anirban, Sk, and Abhigyan Dutta. "Dielectric relaxation and charge carrier mechanism in nanocrystalline Ce–Dy ionic conductors." RSC Advances 6, no. 55 (2016): 49852–61. http://dx.doi.org/10.1039/c6ra06654b.

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11

Fang, Hong, Shuo Wang, Junyi Liu, Qiang Sun, and Puru Jena. "Superhalogen-based lithium superionic conductors." Journal of Materials Chemistry A 5, no. 26 (2017): 13373–81. http://dx.doi.org/10.1039/c7ta01648d.

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Molecular dynamics simulations show Li-ion diffusion in the newly invented antiperovskite Li3OBH4. The blue trajectories show how the Li+ ions run through the lattice of vibrational oxygen (red). The white trajectories show the fast rotational motion of the BH4− superhalogen ions.
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12

Díaz-Guillén, M. R., Karla J. Moreno, J. A. Díaz-Guillén, A. F. Fuentes, J. Garcia-Barriocanal, J. Santamaría, and C. Leon. "Dynamics of Mobile Oxygen Ions in Disordered Pyrochlore-Type Oxide-Ion Conductors." Defect and Diffusion Forum 289-292 (April 2009): 347–54. http://dx.doi.org/10.4028/www.scientific.net/ddf.289-292.347.

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We investigate the effect of cation size in the dc activation energy needed for oxygen ion conductivity, Edc, in highly disordered pyrochlore-type ionic conductors A2B2O7. Twenty compositions of general formula Ln2Zr2-yTiyO7 (Ln = Y, Dy and Gd) and Gd2-yLayZr2O7, were prepared by mechanical milling and their electrical properties measured by using impedance spectroscopy at different temperatures. We also evaluate, by using Ngai’s Coupling Model, the effect of cation radii RA and RB, on the microscopic potential-energy barrier, Ea, that oxygen ions encounter when jumping into neighboring vacant sites. We find that for a fixed B-site cation radius RB, both activation energies decrease with increasing A-site cation size, RA, as a consequence of the increment in the unit cell volume. In contrast, and for a given RA size, the dc activation energy Edc of the Ln2Zr2-yTiyO7 series increases when the average RB size increases. The latter behavior is explained in terms of the enhanced interactions among mobile oxygen ions as the structural disorder increases when RB approaches RA.
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13

Heitjans, Paul, and Martin Wilkening. "Diffusion in Nanocrystalline Ion Conductors Studied by Solid State NMR and Impedance Spectroscopy." Defect and Diffusion Forum 283-286 (March 2009): 705–15. http://dx.doi.org/10.4028/www.scientific.net/ddf.283-286.705.

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Materials with an average particle size of less than about 50 nm often show new or at least enhanced physical properties. In many cases nanocrystalline ionic conductors exhibit a high increase of cation, e. g. Li+, or anion, e. g. F−, diffusivity. In the present contribution we review recent studies on ion dynamics in nanocrystalline ion conductors, both single-phase systems and composites, being prepared by high-energy ball milling. These include, e.g., LiTaO3, Li2O:Al2O3, LiF:Al2O3, BaF2, CaF2, BaF2:CaF2 and (BaF2:CaF2):Al2O3. Dynamic properties were probed by 7Li and/or 19F NMR line shape and relaxation as well as ion conductivity measurements.
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14

Paul, T., and A. Ghosh. "Correlation between structure and oxygen ion dynamics in Y substituted La2Mo2O9 ionic conductors." AIP Advances 6, no. 9 (September 2016): 095015. http://dx.doi.org/10.1063/1.4963199.

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15

Paulus, Werner, Helmut Schober, Stefan Eibl, Mark Johnson, Tanguy Berthier, Olivier Hernandez, Monica Ceretti, Marie Plazanet, Kazimierz Conder, and Carlo Lamberti. "Lattice Dynamics To Trigger Low Temperature Oxygen Mobility in Solid Oxide Ion Conductors." Journal of the American Chemical Society 130, no. 47 (November 26, 2008): 16080–85. http://dx.doi.org/10.1021/ja806144a.

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16

Wang, X. P., Q. F. Fang, Z. S. Li, G. G. Zhang, and Z. G. Yi. "Dielectric relaxation studies of Bi-doping effects on the oxygen-ion diffusion in La2−xBixMo2O9 oxide-ion conductors." Applied Physics Letters 81, no. 18 (October 28, 2002): 3434–36. http://dx.doi.org/10.1063/1.1518151.

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17

Kežionis, Algimantas, Saulius Kazlauskas, Dalius Petrulionis, and Antanas Feliksas Orliukas. "Relationship between charge carrier relaxation and peculiarities of electric response in some solid oxygen ion conductors." Solid State Ionics 279 (October 2015): 25–31. http://dx.doi.org/10.1016/j.ssi.2015.07.009.

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18

Hou, Jungang, Rahul Vaish, Yuanfang Qu, Dalibor Krsmanovic, K. B. R. Varma, and R. V. Kumar. "Dielectric relaxation and electrical conductivity in Bi5NbO10 oxygen ion conductors prepared by a modified sol–gel process." Journal of Power Sources 195, no. 9 (May 2010): 2613–18. http://dx.doi.org/10.1016/j.jpowsour.2009.11.081.

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19

Brinkmann, Detlef. "Quadrupolar Relaxation -what would we do without it in High-Tc Superconductor Studies?" Zeitschrift für Naturforschung A 55, no. 1-2 (February 1, 2000): 323–26. http://dx.doi.org/10.1515/zna-2000-1-256.

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This paper emphasizes the fact that valuable information on the dynamics of high-Tc super-conductors is concealed in that part of the spin-lattice relaxation which arises from quadrupolar interactions. We briefly discuss the problem how to disentangle magnetic and quadrupolar time dependent interactions if both are present, thus leading to multiexponential magnetization recovery laws. We then discuss two examples from our studies of the high-Tc superconductor YBa2Cu4O8 where the identification of a quadrupolar contribution to the spin-lattice relaxation has been es-sential to draw the relevant conclusions. One example is concerned with the charge fluctuations associated with an electronic crossover showing up in the oxygen relaxation. The second example is dealing with the separation of charge and spin excitations and the validity of the single-spin fluid model.
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20

Anirban, Sk, and Abhigyan Dutta. "An insight into the structure, conductivity and ion dynamics of Sr-Sm co-doped ceria oxygen ion conductors: Effect of defect interaction." Solid State Sciences 86 (December 2018): 69–76. http://dx.doi.org/10.1016/j.solidstatesciences.2018.10.007.

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21

Nascimento, Rubens Maribondo, Juliana Maria de Albuquerque Gimenez, Carlos Roberto Grandini, and Alfredo Gonçalves da Cunha. "Anelastic Behavior due to Interstitial Oxygen in SmBa2Cu3O7-δ." Materials Science Forum 530-531 (November 2006): 557–61. http://dx.doi.org/10.4028/www.scientific.net/msf.530-531.557.

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The composite SmBa2Cu3O7-δ (Sm-123), obtained by the substitution of the ion Y for Sm in the very well known and studied YBa2Cu3O7-δ (Y-123), is potentially attractive for better understanding superconductivity mechanisms and for its applications as electronic devices. Sm-123 samples show higher critical temperatures than Y-123 ones do and a larger solubility of Sm in Ba-Cu-O solvent, which makes their growth process faster. When oxygen is present interstitially, it strongly affects the physical properties of the material. The dynamics of oxygen can be investigated by anelastic spectroscopy measurements, a powerful technique for the precise determination of the oscillation frequency and the internal friction when atomic jumps are possible. Anelastic spectroscopy allows determining the elasticity modulus (related to the oscillation frequency) and the elastic energy loss (related to the internal friction) as a function of the temperature. The sample was also investigated by X-ray diffraction (XRD), scanning electronic microscopy (SEM), and electric resistivity. The results obtained show a thermally activated relaxation structure composed by at least 3 relaxation processes. These processes may be attributed to the jumps of oxygen atoms present of the Cu-O plane in the orthorhombic phase.
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22

Caizan Juanarena, Leire, Javier Zamudio, Jose Manuel Porras-Vázquez, Enrique R. Losilla, and David Marrero-Lopez. "(Digital Presentation) La0.8Sr0.2MnO3-Δ-Based Nanocomposite Functional Layers for Improved Cathode Efficiency in SOFCs." ECS Meeting Abstracts MA2022-01, no. 35 (July 7, 2022): 1516. http://dx.doi.org/10.1149/ma2022-01351516mtgabs.

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The ongoing energy transition towards the substitution of fossil fuels for renewable and environmentally friendly energy sources, leads to the search for alternative energy conversion systems. In this context, Solid Oxide Fuel Cells (SOFC) are efficient electrochemical devices that are able to convert chemical energy in the form of fuels into electricity [1]. The efficiency of SOFCs at low operating temperatures is mainly limited by the high polarization resistance of the cathode [2], reason why several strategies are being proposed to enhance the electrochemical activity of such electrodes. Among them, optimizing the electrode microstructure by different preparation methods, such as infiltration and spray-pyrolysis deposition, have rendered excellent and durable electrochemical performance [3]. In addition, the tailoring of the electrode/electrolyte interface by incorporating functional layers have proven to be particularly useful to improve electrode properties [4]. The present work proposes an alternative approach by the incorporation of several nanocomposite functional layers at the interface between the traditional La0.8Sr0.2MnO3- d (LSM) cathode and the Zr0.84Y0.16O2- d (YSZ) electrolyte. Different compositions that combined LSM with different ionic conductors, i.e. LSM-Ce0.9Gd0.1O1.95 (CGO) and LSM-Bi1.5Y0.5O3 (BYO), were directly deposited by spray-pyrolysis on the YSZ electrolyte in a single step by a co-synthesis method. The nanocomposite functional layers were studied by different structural and microstructural techniques, such as XRD and SEM-EDX. They exhibited lower grain size compared to that of the homologous single phase; specially the LSM-CGO nanocomposite showed improved adherence to the electrolyte without the presence of any crack or delamination, with the lowest grain sizes of 12.54 and 8.56 nm for LSM and CGO, respectively, after annealing at 1000 ºC. SEM images revealed a dense functional layer with a thickness of about 750 nm (Fig 1A). Overall, all functional layers showed a dense structure with excellent adherence to the electrolyte and no chemical reaction could be detected between the cell components. The electrochemical properties of functional layers were also investigated by impedance spectroscopy, distribution of relaxation time, dc-bias and I-V curves. The incorporation of any functional layer reduced the Area Specific Resistance (ASR) values of the cathode, which was associated with a reduced charge transfer resistance and a fast oxide ion transport at the electrode/electrolyte interface as consequence of the good ionic/electronic conductivity of the functional layer. The polarization resistance at 700 ºC was of 1.71 and 0.46 Ω cm2 for the LSM cathode without and with LSM-CGO active layer, respectively (Fig. 1B). The performance of the single cell with LSM-CGO as functional layer, Ni-YSZ|YSZ|LSM-CGO/LSM, revealed maximum power densities of 1.20 and 0.85 W cm-2 at 800 and 700 ºC, respectively, values that were considerably higher than those obtained for the cell without any functional layer, i.e. 0.79 and 0.46 W cm-2. The obtained results confirm the improved performance of SOFCs when tailoring the cathode/electrolyte interface by incorporating a functional layer with nanostructured features and mixed ionic-electronic conducting properties. With that in mind, this research may serve to improve the electrochemical performance of solid oxide cells at intermediate/low operating temperatures without compromising the cell’s integrity. [1] A.B. Stambouli, E. Traversa, A. Stambouli, Solid oxide fuel cells (SOFCs): a review of an environmentally clean and efficient source of energy, Renew. Sustain. Energy Rev. 6 (2002) 433–455. [2] S.B. Adler, Factors Governing Oxygen Reduction in Solid Oxide Fuel Cell Cathodes, (2004). [3] L. dos Santos-Gómez, E.R. Losilla, F. Martín, J.R. Ramos-Barrado, D. Marrero-López, Novel Microstructural Strategies To Enhance the Electrochemical Performance of La0.8Sr0.2MnO3−δ Cathodes, ACS Appl. Mater. Interfaces. 7 (2015) 7197–7205. [4] V. Zapata-Ramírez, L. dos Santos-Gómez, G.C. Mather, D. Marrero-López, D. Pérez-Coll, Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers, ACS Appl. Mater. Interfaces. 12 (2020) 10571–10578. Figure 1 . A) Scanning electron microscopy (SEM) image of the LSM cathode deposited onto YSZ with a LSM-CGO nanocomposite functional layer in the electrode/electrolyte interface. B) Impedance Spectroscopy (EIS) test at 700 ºC of the LSM cathode with no functional layer (black), with single-phase LSM as functional layer (red), and LSM-CGO nanocomposite as functional layer (blue). Figure 1
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23

Andre, E., E. Yaniz-Galende, C. Hamilton, G. J. Dusting, N. Hellen, CE Poulet, M. Diez Cunado, et al. "Poster session 1Cell growth, differentiation and stem cells - Heart72Understanding the metabolism of cardiac progenitor cells: a first step towards controlling their proliferation and differentiation?73Expression of pw1/peg3 identifies a new cardiac adult stem cell population involved in post-myocardial infarction remodeling74Long-term stimulation of iPS-derived cardiomyocytes using optogenetic techniques to promote phenotypic changes in E-C coupling75Benefits of electrical stimulation on differentiation and maturation of cardiomyocytes from human induced pluripotent stem cells76Constitutive beta-adrenoceptor-mediated cAMP production controls spontaneous automaticity of human induced pluripotent stem cell-derived cardiomyocytes77Formation and stability of T-tubules in cardiomyocytes78Identification of miRNAs promoting human cardiomyocyte proliferation by regulating Hippo pathway79A direct comparison of foetal to adult epicardial cell activation reveals distinct differences relevant for the post-injury response80Role of neuropilins in zebrafish heart regeneration81Highly efficient immunomagnetic purification of cardiomyocytes derived from human pluripotent stem cells82Cardiac progenitor cells posses a molecular circadian clock and display large 24-hour oscillations in proliferation and stress tolerance83Influence of sirolimus and everolimus on bone marrow-derived mesenchymal stem cell biology84Endoglin is important for epicardial behaviour following cardiac injuryCell death and apoptosis - Heart87Ultrastructural alterations reflecting Ca2+ handling and cell-to-cell coupling disorders precede occurrence of severe arrhythmias in intact animal heart88Urocortin-1 promotes cardioprotection through ERK1/2 and EPAC pathways: role in apoptosis and necrosis89Expression p38 MAPK and Cas-3 in myocardium LV of rats with experimental heart failure at melatonin and enalapril introductionTranscriptional control and RNA species - Heart92Accumulation of beta-amyloid 1-40 in HF patients: the role of lncRNA BACE1-AS93Role of miR-182 in zebrafish and mouse models of Holt-Oram syndrome94Mir-27 distinctly regulates muscle-enriched transcription factors and growth factors in cardiac and skeletal muscle cells95AF risk factors impair PITX2 expression leading to Wnt-microRNA-ion channel remodelingCytokines and cellular inflammation - Heart98Post-infarct survival depends on the interplay of monocytes, neutrophils and interferon gamma in a mouse model of myocardial Infarction99Inflammatory cd11b/c cells play a protective role in compensated cardiac hypertrophy by promoting an orai3-related pro-survival signal100Anti-inflammatory effects of endothelin receptor blockade in the atrial tissue of spontaneously hypertensive rats101Mesenchymal stromal cells reduce NLRP3 inflammasome activity in Coxsackievirus B3-induced myocarditis102Mesenchymal stromal cells modulate monocytes trafficking in Coxsackievirus B3-induced myocarditis103The impact of regulatory T lymphocytes on long-term mortality in patients with chronic heart failure104Temporal dynamics of dendritic cells after ST-elevation myocardial infarction relate with improvement of myocardial functionGrowth factors and neurohormones - Heart107Preconditioning of hypertrophied heart: miR-1 and IGF-1 crosstalk108Modulation of catecholamine secretion from human adrenal chromaffin cells by manipulation of G protein-coupled receptor kinase-2 activity109Evaluation of cyclic adenosin-3,5- monophosphate and neurohormones in patients with chronic heart failureNitric oxide and reactive oxygen species - Heart112Hydrogen sulfide donor inhibits oxidative and nitrosative stress, cardiohemodynamics disturbances and restores cNOS coupling in old rats113Role and mechanisms of action of aldehydes produced by monoamine oxidase A in cardiomyocyte death and heart failure114Exercise training has contrasting effects in myocardial infarction and pressure-overload due to different endothelial nitric oxide synthase regulation115S-Nitroso Human Serum Albumin dose-dependently leads to vasodilation and alters reactive hyperaemia in coronary arteries of an isolated mouse heart model116Modulating endothelial nitric oxide synthase with folic acid attenuates doxorubicin-induced cardiomyopathy119Effects of long-term very high intensity exercise on aortic structure and function in an animal model120Electron paramagnetic resonance spectroscopy quantification of nitrosylated hemoglobin (HbNO) as an index of vascular nitric oxide bioavailability in vivo121Deletion of repressor activator protein 1 impairs acetylcholine-induced relaxation due to production of reactive oxygen speciesExtracellular matrix and fibrosis - Heart124MicroRNA-19b is associated with myocardial collagen cross-linking in patients with severe aortic stenosis. Potential usefulness as a circulating biomarker125A new ex vivo model to study cardiac fibrosis126Heterogeneity of fibrosis and fibroblast differentiation in the left ventricle after myocardial infarction127Effect of carbohydrate metabolism degree compensation to the level of galectin-3 changes in hypertensive patients with chronic heart failure and type 2 diabetes mellitus128Statin paradox in association with calcification of bicuspid aortic valve interstitial cells129Cardiac function remains impaired despite reversible cardiac fibrosis after healed experimental viral myocarditisIon channels, ion exchangers and cellular electrophysiology - Heart132Identifying a novel role for PMCA1 (Atp2b1) in heart rhythm instability133Mutations of the caveolin-3 gene as a predisposing factor for cardiac arrhythmias134The human sinoatrial node action potential: time for a computational model135iPSC-derived cardiomyocytes as a model to dissect ion current alterations of genetic atrial fibrillation136Postextrasystolic potentiation in healthy and diseased hearts: effects of the site of origin and coupling interval of the preceding extrasystole137Absence of Nav1.8-based (late) sodium current in rabbit cardiomyocytes and human iPSC-CMs138hiPSC-derived cardiomyocytes from Brugada Syndrome patients without identified mutations do not exhibit cellular electrophysiological abnormalitiesMicrocirculation141Atherogenic indices, collagen type IV turnover and the development of microvascular complications- study in diabetics with arterial hypertension142Changes in the microvasculature and blood viscosity in women with rheumatoid arthritis, hypercholesterolemia and hypertensionAtherosclerosis145Shear stress regulates endothelial autophagy: consequences on endothelial senescence and atherogenesis146Obstructive sleep apnea causes aortic remodeling in a chronic murine model147Aortic perivascular adipose tissue displays an aged phenotype in early and late atherosclerosis in ApoE-/- mice148A systematic evaluation of the cellular innate immune response during the process of human atherosclerosis149Inhibition of Coagulation factor Xa increases plaque stability and attenuates the onset and progression of atherosclerotic plaque in apolipoprotein e-deficient mice150Regulatory CD4+ T cells from patients with atherosclerosis display pro-inflammatory skewing and enhanced suppression function151Hypoxia-inducible factor (HIF)-1alpha regulates macrophage energy metabolism by mediating miRNAs152Extracellular S100A4 is a key player of smooth muscle cell phenotypic transition: implications in atherosclerosis153Microparticles of healthy origins improve atherosclerosis-associated endothelial progenitor cell dysfunction via microRNA transfer154Arterial remodeling and metabolism impairment in early atherosclerosis155Role of pannexin1 in atherosclerotic plaque formationCalcium fluxes and excitation-contraction coupling158Amphiphysin II induces tubule formation in cardiac cells159Interleukin 1 beta regulation of connexin 43 in cardiac fibroblasts and the effects of adult cardiac myocyte:fibroblast co-culture on myocyte contraction160T-tubular electrical defects contribute to blunted beta-adrenergic response in heart failure161Beat-to-beat variability of intracellular Ca2+ dynamics of Purkinje cells in the infarct border zone of the mouse heart revealed by rapid-scanning confocal microscopy162The efficacy of late sodium current blockers in hypertrophic cardiomyopathy is dependent on genotype: a study on transgenic mouse models with different mutations163Synthesis of cADPR and NAADP by intracellular CD38 in heart: role in inotropic and arrhythmogenic effects of beta-adrenoceptor signalingContractile apparatus166Towards an engineered heart tissue model of HCM using hiPSC expressing the ACTC E99K mutation167Diastolic mechanical load delays structural and functional deterioration of ultrathin adult heart slices in culture168Structural investigation of the cardiac troponin complex by molecular dynamics169Exercise training restores myocardial and oxidative skeletal muscle function from myocardial infarction heart failure ratsOxygen sensing, ischaemia and reperfusion172A novel antibody specific to full-length stromal derived factor-1 alpha reveals that remote conditioning induces its cleavage by endothelial dipeptidyl peptidase 4173Attenuation of myocardial and vascular arginase activity by vagal nerve stimulation via a mechanism involving alpha-7 nicotinic receptor during cardiac ischemia and reperfusion174Novel nanoparticle-mediated medicine for myocardial ischemia-reperfusion injury simultaneously targeting mitochondrial injury and myocardial inflammation175Acetylcholine plays a key role in myocardial ischaemic preconditioning via recruitment of intrinsic cardiac ganglia176The role of nitric oxide and VEGFR-2 signaling in post ischemic revascularization and muscle recovery in aged hypercholesterolemic mice177Efficacy of ischemic preconditioning to protect the human myocardium: the role of clinical conditions and treatmentsCardiomyopathies and fibrosis180Plakophilin-2 haploinsufficiency leads to impaired canonical Wnt signaling in ARVC patient181Improved technique for customized, easier, safer and more reliable transverse aortic arch banding and debanding in mice as a model of pressure overload hypertrophy182Late sodium current inhibitors for the treatment of inducible obstruction and diastolic dysfunction in hypertrophic cardiomyopathy: a study on human myocardium183Angiotensin II receptor antagonist fimasartan has protective role of left ventricular fibrosis and remodeling in the rat ischemic heart184Role of High-Mobility Group Box 1 (HMGB1) redox state on cardiac fibroblasts activities and heart function after myocardial infarction185Atrial remodeling in hypertrophic cardiomyopathy: insights from mouse models carrying different mutations in cTnT186Electrophysiological abnormalities in ventricular cardiomyocytes from a Maine Coon cat with hypertrophic cardiomyopathy: effects of ranolazine187ZBTB17 is a novel cardiomyopathy candidate gene and regulates autophagy in the heart188Inhibition of SRSF4 in cardiomyocytes induces left ventricular hypertrophy189Molecular characterization of a novel cardiomyopathy related desmin frame shift mutation190Autonomic characterisation of electro-mechanical remodeling in an in-vitro leporine model of heart failure191Modulation of Ca2+-regulatory function by three novel mutations in TNNI3 associated with severe infant restrictive cardiomyopathyAging194The aging impact on cardiac mesenchymal like stromal cells (S+P+)195Reversal of premature aging markers after bariatric surgery196Sex-associated differences in vascular remodeling during aging: role of renin-angiotensin system197Role of the receptor for advanced glycation end-products (RAGE) in age dependent left ventricle dysfunctionsGenetics and epigenetics200hsa-miR-21-5p as a key factor in aortic remodeling during aneurysm formation201Co-inheritance of mutations associated with arrhythmogenic and hypertrophic cardiomyopathy in two Italian families202Lamin a/c hot spot codon 190: form various amino acid substitutions to clinical effects203Treatment with aspirin and atorvastatin attenuate cardiac injury induced by rat chest irradiation: Implication of myocardial miR-1, miR-21, connexin-43 and PKCGenomics, proteomics, metabolomics, lipidomics and glycomics206Differential phosphorylation of desmin at serines 27 and 31 drives the accumulation of preamyloid oligomers in heart failure207Potential role of kinase Akt2 in the reduced recovery of type 2 diabetic hearts subjected to ischemia / reperfusion injury208A proteomics comparison of extracellular matrix remodelling in porcine coronary arteries upon stent implantationMetabolism, diabetes mellitus and obesity211Targeting grk2 as therapeutic strategy for cancer associated to diabetes212Effects of salbutamol on large arterial stiffness in patients with metabolic syndrome213Circulating microRNA-1 and microRNA-133a: potential biomarkers of myocardial steatosis in type 2 diabetes mellitus214Anti-inflammatory nutrigenomic effects of hydroxytyrosol in human adipocytes - protective mechanisms of mediterranean diets in obesity-related inflammation215Alterations in the metal content of different cardiac regions within a rat model of diabetic cardiomyopathyTissue engineering218A novel conductive patch for application in cardiac tissue engineering219Establishment of a simplified and improved workflow from neonatal heart dissociation to cardiomyocyte purification and characterization220Effects of flexible substrate on cardiomyocytes cell culture221Mechanical stretching on cardiac adipose progenitors upregulates sarcomere-related genes." Cardiovascular Research 111, suppl 1 (July 1, 2016): S16—S42. http://dx.doi.org/10.1093/cvr/cvw135.

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24

Fuentes, Antonio F., Karla J. Moreno, Jacobo Santamaria, Carlos Leon, and Ulises Amador. "Structural Characterization and Ionic Conductivity of Metastable Gd2(Ti0.65Zr0.35)2O7 Powders Prepared by Mechanical Milling." MRS Proceedings 972 (2006). http://dx.doi.org/10.1557/proc-0972-aa09-04.

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AbstractWe analyze in this work the influence of ordering on the oxygen ion dynamics in the ionic conductor Gd2(Ti0.65Zr0.35)2O7, prepared by mechanical milling. As-prepared powder phase presents a metastable anion deficient fluorite-type of structure below 800°C becoming a disordered pyrochlore above this temperature. Such phase transformation implies a significant increase in the ionic conductivity of this material as a result of a systematic decrease in the activation energy for the dc conductivity, from 1.23 to 0.78 eV. Electrical conductivity relaxation is well described by the Kohlrausch-Williams-Watts (KWW) stretched exponential function with the fractional exponent n decreasing systematically with increasing sintering temperature (increasing ordering) as a result of decreasing ion-ion interactions in better ordered samples.
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25

he, chan, Shu-Yao Cao, weiguo wang, and gangling hao. "Electrical conductivity and oxygen relaxation behavior in BaBi1-xSrxNb5O15-δ tungsten bronze ceramics." Dalton Transactions, 2022. http://dx.doi.org/10.1039/d2dt02944h.

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BaBiNb5O15 (BBN) based oxide-ion conductors have great potential applications in intermediate-temperature solid oxide fuel cells. In this work, the electrical property enhancement is achieved by Sr2+ ion doping and sintering...
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26

Funke, Klaus. "Solid Electrolytes: Jump Relaxation and “Universal” Dynamic Response." MRS Proceedings 135 (1988). http://dx.doi.org/10.1557/proc-135-43.

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AbstractIn solid ionic conductors, the hopping motion of the mobile charged defects is strongly influenced by their mutual repulsive interaction. Therefore, their jump diffusion ist not a random process. Instead, correlated forward-backward hopping sequences are a common phenomenon, constituting the elementary steps of jump relaxation. The microscopic dynamics of the relaxation is described in a simple model which yields the frequency spectrum of the hopping motion. With the help of this function, it is possible to explain experimental spectra displaying the so-called “universal” dynamic response. In particular we reproduce the frequency dependent ionic conductivity of fast ion conductors and the arcs in their complex-conductivity and complex-permittivity planes. The model also explains the non-BPP-type behavior of spin-lattice relaxation times and the broad components of quasielastic neutron scattering spectra. Examples are presented and discussed.
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27

Díaz-Guillén, M. R., K. J. Moreno, J. A. Díaz-Guillén, A. F. Fuentes, K. L. Ngai, J. Garcia-Barriocanal, J. Santamaria, and C. Leon. "Cation size effects in oxygen ion dynamics of highly disordered pyrochlore-type ionic conductors." Physical Review B 78, no. 10 (September 19, 2008). http://dx.doi.org/10.1103/physrevb.78.104304.

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28

Momenzadeh, Leila, Steffen Grieshammer, Irina V. Belova, and Graeme E. Murch. "An overview of thermotransport in fluorite-related ionic oxides." Zeitschrift für Physikalische Chemie, October 21, 2021. http://dx.doi.org/10.1515/zpch-2021-3107.

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Abstract In this overview, we summarize the phenomenon of thermotransport (the close coupling of mass transport and heat transport) in two fast ion conductors: yttria-doped zirconia and gadolinia-doped ceria. We focus on two recent molecular dynamics calculations using the Green-Kubo formalism. We show that the Onsager thermotransport cross coefficient (mass-heat coupling) is negative, meaning that oxygen ions would drift, in principle, to the hot side in a temperature gradient. Simulation results presented in this overview show reasonable agreement with available experimental data for thermal conductivity. Results of this study suggest that the coupling between mass and heat transport in oxygen ion electrolytes could have significant effect for practical applications.
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29

Vogel, Dayton J., and Dmitri S. Kilin. "Electron Dynamics of Solvated Ti(OH)4." MRS Proceedings 1647 (2014). http://dx.doi.org/10.1557/opl.2014.91.

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ABSTRACTIncreasing interest in the photocatalytic activity of TiO2 has led to considerations of using TiO2 nanoparticles in energy generation. In order to better understand the electron-hole relaxation of nano scale TiO2 structures, it is important to start with an understanding of TiO2 synthesis building blocks. The solvated titanium (IV) ion is a precursor found in synthesis methods of colloidal TiO2 nanostructures. This simplest test compound may reflect some common basic electronic features for larger structures composed of Ti(IV) coordinated with oxygen. For this computational study, a model of Ti(OH)4 with tetrahedral coordination was created. To simulate the electronic properties of a solution of Ti(IV), the model was surrounded with 27 H2O molecules. The model was explored by means of standard density functional theory (DFT) molecular dynamics (MD) followed by nonadiabatic electron dynamics computed with Reduced Density Matrix approach combined with “on-the-fly coupling”. Results were generated with Vienna ab initio Simulation Package (VASP) using the Perdew-Burke-Ernzerhof (PBE) functional, plane wave basis set, and projector augmented wave (PAW) potentials. The absorption spectra, MD, and electron-hole relaxation rates are presented for the Ti(OH)4 model at various ambient temperatures. The electron-hole relaxation rates show a non-linear dependence on temperature and were found to be near the same order of magnitude as electron-hole relaxation rates in bulk TiO2 calculations. A video of the geometry optimization can be found online.[1]
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30

Oupatam, Matachan, Panupol Untarabut, and Kiettipong Banlusan. "Lithium Trapping and Irreversible Atomic-Scale Structure Evolution during Delithiation of Silicon Oxides as Lithium-Ion Battery Anodes." Journal of The Electrochemical Society, April 7, 2023. http://dx.doi.org/10.1149/1945-7111/accb72.

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Abstract Optimizing the oxygen content of silicon oxides used as anode materials for high-performance lithium-ion batteries is critical since it has diverse effects on lithium storage properties. However, the atomic-scale understanding of the effect of the oxygen content on structural evolution of the materials, particularly during delithiation is still limited. With this aim, we employ an iterative lithium extraction-relaxation algorithm based on reactive molecular dynamics simulations to investigate the dynamic processes of various silicon oxides. Our study highlights the effect of the oxygen content on various lithium storage properties, including the energetics of the interaction, lithium diffusion behaviors, lithium entrapment, structural reversibility during cycling, and mechanical properties. In particular, the simulations show that although increasing the oxygen content can significantly reduce the percentage of volume expansion during lithiation, which is a major cause of poor cycle retention of silicon- and silicon oxide-based anodes, this leads to an increased amount of the trapped lithium and an irreversible structural change during the reverse process. As contradictory conditions are required to achieve high specific capacity, long cycle life, and high coulombic efficiency, this atomistic study could provide a fundamental understanding beneficial for optimizing the oxygen content toward the development of silicon oxide-based anodes.
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