排序方式: 共有6条查询结果,搜索用时 15 毫秒
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A. Centeno V.G. Rocha B. Alonso A. Fernández C.F. Gutierrez-Gonzalez R. Torrecillas A. Zurutuza 《Journal of the European Ceramic Society》2013,33(15-16):3201-3210
A simple, fast and upscalable method is described to produce graphene/alumina (G/Al2O3) composites by spark plasma sintering (SPS) with a significant improvement on both mechanical and electrical properties of monolithic Al2O3. Graphene oxide (GO) was mixed with Al2O3 using a colloidal method obtaining an excellent dispersion of GO in the alumina matrix. The material was consolidated by SPS that allowed, in one-step, the in situ reduction of the GO during the sintering process. A detailed Raman analysis was found to be very useful to study the orientation of the graphene in the composite and to evaluate and optimise its thermal reduction. Graphene platelets acted as elastic bridges avoiding crack propagation and providing this material with a crack bridging reinforcement mechanism. A very low graphene loading (0.22 wt%) led to a 50% improvement on the mechanical properties of the alumina and to an increase of the electrical conductivity up to eight orders of magnitude. 相似文献
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Zurutuza Irati Isasti Nerea Detemple Eric Schwinn Volker Mohrbacher Hardy Uranga Pello 《Metallurgical and Materials Transactions A》2022,53(4):1529-1539
Metallurgical and Materials Transactions A - This work has focused on the study of hot working behavior of boron high strength steels microalloyed with different combinations of Nb and/or Mo. The... 相似文献
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Strongly Anisotropic Thermal Conductivity of Free‐Standing Reduced Graphene Oxide Films Annealed at High Temperature 下载免费PDF全文
Jackie D. Renteria Sylvester Ramirez Hoda Malekpour Beatriz Alonso Alba Centeno Amaia Zurutuza Alexandr I. Cocemasov Denis L. Nika Alexander A. Balandin 《Advanced functional materials》2015,25(29):4664-4672
Thermal conductivity of free‐standing reduced graphene oxide films subjected to a high‐temperature treatment of up to 1000 °C is investigated. It is found that the high‐temperature annealing dramatically increases the in‐plane thermal conductivity, K, of the films from ≈3 to ≈61 W m?1 K?1 at room temperature. The cross‐plane thermal conductivity, K⊥, reveals an interesting opposite trend of decreasing to a very small value of ≈0.09 W m?1 K?1 in the reduced graphene oxide films annealed at 1000 °C. The obtained films demonstrate an exceptionally strong anisotropy of the thermal conductivity, K/K⊥ ≈ 675, which is substantially larger even than in the high‐quality graphite. The electrical resistivity of the annealed films reduces to 1–19 Ω □?1. The observed modifications of the in‐plane and cross‐plane thermal conductivity components resulting in an unusual K/K⊥ anisotropy are explained theoretically. The theoretical analysis suggests that K can reach as high as ≈500 W m?1 K?1 with the increase in the sp2 domain size and further reduction of the oxygen content. The strongly anisotropic heat conduction properties of these films can be useful for applications in thermal management. 相似文献
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Serradilla Oscar Zugasti Ekhi Rodriguez Jon Zurutuza Urko 《Applied Intelligence》2022,52(10):10934-10964
Applied Intelligence - Given the growing amount of industrial data in the 4th industrial revolution, deep learning solutions have become popular for predictive maintenance (PdM) tasks, which... 相似文献
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J. J. Velasco-Vélez D. Teschner F. Girgsdies M. Hävecker V. Streibel M. G. Willinger J. Cao M. Lamoth E. Frei R. Wang A. Centeno A. Zurutuza S. Hofmann R. Schlögl A. Knop-Gericke 《Topics in Catalysis》2018,61(20):2052-2061
The selective hydrogenation of propyne over a Pd-black model catalyst was investigated under operando conditions at 1 bar making use of advanced X-ray diffraction (bulk sensitive) and photo-electron spectroscopy (surface sensitive) techniques. It was found that the population of subsurface species controls the selective catalytic semi-hydrogenation of propyne to propylene due to the formation of surface and near-surface PdCx that inhibits the participation of more reactive bulk hydrogen in the hydrogenation reaction. However, increasing the partial pressure of hydrogen reduces the population of PdCx with the concomitant formation of a β-PdHx phase up to the surface, which is accompanied by a lattice expansion, allowing the participation of more active bulk hydrogen which is responsible for the unselective total alkyne hydrogenation. Therefore, controlling the surface and subsurface catalyst chemistry is crucial to control the selective alkyne semi-hydrogenation. 相似文献
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