Influence of pr content on the sructure and giant magnetoresistance of Pr x (Co40Ag60)100−x granular films

Cheng, Gang; Wu, Yong; Gu, Zhonghua; Chen, Wei; Wu, Xiaofei

doi:10.1007/s11595-011-0155-y

Cited by 11 publications

(15 citation statements)

References 7 publications

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“…The compression tests show that the strength of Al 2 O 3 parts containing pores at two distinct length scales is 5–10 times higher compared to reference samples with the same chemical composition and comparable size of pores at the coarser length scale ( Figure A). [ 48,49 ] Such high strength is also achieved by Al/Al 2 O 3 parts with the same level of porosity.…”

Section: Resultsmentioning

confidence: 89%

“…Mechanical properties of the hierarchical porous materials. A,B) Compressive strength of the hierarchical foam materials prepared in this work in comparison to A) conventional Al foams and Al 2 O 3 foams prepared with Al 2 O 3 particles [ 48,49 ] and B) bulk alumina foams prepared via various other methods, [ 6 ] including 3D printing. [ 19,20,23,50,51 ] C) Simulation of the stress distribution within a model hierarchical foam structure compared to a structure with dense walls at equivalent overall porosity and subjected to the same external stress.…”

Section: Resultsmentioning

confidence: 99%

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Ultrastrong Hierarchical Porous Materials via Colloidal Assembly and Oxidation of Metal Particles

Huo

Zhang

Tervoort

et al. 2020

Adv Funct Materials

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Porous materials are useful as lightweight structures, bone substitutes, and thermal insulators, but exhibit poor mechanical properties compared to their dense counterparts. Biological materials such as bone and bamboo are able to circumvent this trade‐off between porosity and mechanical performance by combining pores at multiple length scales. Inspired by these biological architectures, a manufacturing platform that allows for the fabrication of Al2O3 foams and Al2O3/Al composites with hierarchical porosity and enhanced mechanical properties is developed. Macroscale pores are formed through the assembly of aluminum particles around templating air bubbles in wet foams, whereas the thermal oxidation of the metal particles above 800 °C generates porosity at the micrometer scale. After elucidating the mechanism of pore formation under different sintering conditions at the microscale, the mechanical performance of the resulting hierarchical foams using compression experiments and finite element simulations is evaluated. Porous materials manufactured via this simple approach are found to reach unparalleled mechanical properties with near‐zero sintering shrinkage and minimum loss in mechanical strength. The ability to produce macroscopic objects with ultrahigh strength at porosities up to 95% makes this an attractive manufacturing technology for the fabrication of high‐performance lightweight structures or advanced thermal and acoustic insulators.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Ultrastrong Hierarchical Porous Materials via Colloidal Assembly and Oxidation of Metal Particles

Huo

Zhang

Tervoort

et al. 2020

Adv Funct Materials

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“…Concurrent with TGD's flow regulation, a considerable amount of sediment in the upstream Yangtze flow (e.g., ∼60% in 2003-2006 estimated by Xu and Milliman (2009)) has been retained in the TGR, leading to decrease of sediment load released from the dam and long-term geometric/morphologic changes (e.g., erosion) to the downstream Yangtze channel (Yang et al 2007, Xu and Milliman 2009, Cheng et al 2011, Dai and Liu 2013. Channel-derived sediment in the downstream reach did not completely offset the sediment loss in the TGR (Yang et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Existing studies of TGD's downstream impacts have primarily focused on (i) the alteration of Yangtze flows (Dai et al 2008, Xiao and Chen 2011, Gao et al 2013, (ii) the decrease of sediment transport rate and the consequential channel degradation/erosion (Yang et al 2006, Hu et al 2009, Xu and Milliman 2009, Cheng et al 2011, Dai and Liu 2013 Here we present a first systematic assessment of the TGD influence on the seasonal regime of Yangtze River levels immediately downstream from the TGD water-control system to the Yangtze estuary, by comparatively quantifying the impacts of two major outcomes of TGD operation: (i) regulated Yangtze flow and (ii) concurrent channel erosion due to reduced sediment load. Specifically, the analysis was targeted to address three scientific questions currently under inadequate investigation in the literature.…”

Section: Introductionmentioning

confidence: 99%

Downstream Yangtze River levels impacted by Three Gorges Dam

Wang

Sheng

Gleason

et al. 2013

Environ. Res. Lett.

131

101

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Changes in the Yangtze River level induced by large-scale human water regulation have profound implications on the inundation dynamics of surrounding lakes/wetlands and the integrity of related ecosystems. Using in situ measurements and hydrological simulation, this study reveals an altered Yangtze level regime downstream from the Three Gorges Dam (TGD) to the Yangtze estuary in the East China Sea as a combined result of (i) TGD's flow regulation and (ii) Yangtze channel erosion due to reduced sediment load. During the average annual cycle of TGD's regular flow control in 2009-2012, downstream Yangtze level variations were estimated to have been reduced by 3.9-13.5% at 15 studied gauging stations, manifested as evident level decrease in fall and increase in winter and spring. The impacts on Yangtze levels generally diminished in a longitudinal direction from the TGD to the estuary, with a total time lag of ∼9-12 days. Chronic Yangtze channel erosion since the TGD closure has lowered water levels in relation to flows at most downstream stations, which in turn counteracts the anticipated level increase by nearly or over 50% in winter and spring while reinforcing the anticipated level decrease by over 20% in fall. Continuous downstream channel erosion in the near future may further counteract the benefit of increased Yangtze levels during TGD's water supplement in winter and accelerate the receding of inundation areas/levels of downstream lakes in fall.

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“…[17] After coupling CoO with hi- positively Synchrotron-based near edge X-ray absorption fine structure (NEXAFS) technique was further used to explore the origin of the high-energy structure of CoO/hi-Mn 3 O 4 .The NEXAFS spectra of Mn L-edge that is sensitive to the oxidation state are shown in Figure 2b.B efore deposition of CoO,h i-Mn 3 O 4 presents two groups of peaks,t he peak at 640.2 eV corresponding to Mn II ,a nd the peaks (a 1 and a 2 ) from 641.0 to 643.0 eV for Mn III . [18] Thep eak a 1 with ar elatively low energy refers to elongated Mn III ÀOb onds through electron-phonon coupling and the peak a 2 with ar elatively high energy refers to short Mn III ÀOb onds. [19] After coupling with CoO,the spectrum of hi-Mn 3 TheO ER catalytic activity of the materials studied was investigated using electrochemical techniques including polarization, chronoamperometry,c hronopotentiometry,a nd impedance measurements.P olarization curves shown in Figure (Table S1) and the Ru/C catalyst (386 mV), proving high OER performance of CoO/hi-Mn 3 O 4 .T his excellent OER catalytic behavior is further evidenced by the Tafel plots in Figure 3b,s howing that CoO/hi-Mn 3 O 4 exhibits the lowest Tafel slope for af ast kinetic process.…”

mentioning

confidence: 99%

Engineering High‐Energy Interfacial Structures for High‐Performance Oxygen‐Involving Electrocatalysis

et al. 2017

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Engineering high-energy interfacial structures for high-performance electrocatalysis is achieved by chemical coupling of active CoO nanoclusters and high-index facet Mn 3 O 4 nano-octahedrons (hi-Mn 3 O 4 ). At horough characterization, including synchrotron-based near edge X-raya bsorption fine structure,reveals that strong interactions between both components promote the formation of high-energy interfacial Mn-O-Co species and high oxidation state CoO,f rom which electrons are drawn by Mn III -O present in hi-Mn 3 O 4 .The CoO/ hi-Mn 3 O 4 demonstrates an excellent catalytic performance over the conventional metal oxide-based electrocatalysts,which is reflected by 1.2 times higher oxygen evolution reaction (OER) activity than that of Ru/C and ac omparable oxygen reduction reaction (ORR) activity to that of Pt/C as well as ab etter stability than that of Ru/C (95 %v s. 81 %r etained OER activity) and Pt/C (92 %vs. 78 %retained ORR activity after 10 hrunning) in alkaline electrolyte.A proper interfacial structure of heterogeneous catalysts is of great importance because it can promote the catalytic reactions occurring on the surface.[1] High-energy interfacial structures can facilitate adsorption of reactants on the surface of the catalyst, and charge transport, which result in enhancing catalytic performance.[2] Fori nstance,h eterogeneous catalysts composed of Cu and ZnO nanoparticles on Al 2 O 3 supports are effectively used for industrial production of methanol because ahigh-energy interface between Cu, ZnO, and Al 2 O 3 support can enable astrong binding of the reaction intermediates that improves catalytic activity.[3] Thec oordinatively unsaturated ferrous sites are active centers in awide range of catalytic reactions,and their catalytic activity can be significantly enhanced through high-energy interfacial confinement with metal substrates,e .g., Pt, exhibiting efficient carbon monoxide oxidation.[4] Thereby,the rational design of active materials on proper supports to generate high-energy interfacial structures is critical in fabricating high-performance heterogeneous catalysts.Oxygen-involving electrocatalytic reactions such as oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are important energy-relevant conversion processes, [5] which play important roles in metal-air batteries, fuel cells,and water electrolysis.Both OER and ORR involve am ultistep proton-coupled electron transfer, and thus suffer from ak inetically sluggish process.[6] Moreover,s ome technologies such as rechargeable metal-air batteries reversibly involve OER and ORR during the operation, and the use of two different electrocatalysts for OER (e.g.,R u) and ORR (e.g.,Pt) makes these devices much more complex because of combining two different electrodes;a lso,t heir volumetric energy density is unfavorable.[7] Thus,h igh-performance bifunctional oxygen-involving electrocatalysts are highly desirable.Recently,t here is ag reat interest in fabricating nanostructured composite materials by depositing abundan...

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Influence of pr content on the sructure and giant magnetoresistance of Pr x (Co40Ag60)100−x granular films

Cited by 11 publications

References 7 publications

Ultrastrong Hierarchical Porous Materials via Colloidal Assembly and Oxidation of Metal Particles

Ultrastrong Hierarchical Porous Materials via Colloidal Assembly and Oxidation of Metal Particles

Downstream Yangtze River levels impacted by Three Gorges Dam

Engineering High‐Energy Interfacial Structures for High‐Performance Oxygen‐Involving Electrocatalysis

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