Magnesium hydride (MgH2) exhibits long-term stability and has recently been developed as a safe alternative to store hydrogen in the solid state, due its high capacity of 7.6 wt% H2 low cost compared other metal hydrides. However, activation energy poor kinetics MgH2 lead inadequate storage properties, resulting efficiency. Nano-catalysis is deemed be most effective strategy improving performance materials. In this work, robust efficient architectures carbon-wrapped transition (Co/C, Ni/C)...

Abstract High-entropy alloy (HEA) nanoparticles (NPs) exhibit unusual combinations of functional properties. However, their scalable synthesis remains a significant challenge requiring extreme fabrication conditions. Metal salts are often employed as precursors because low decomposition temperatures, yet contain potential impurities. Here, we propose an ultrafast (< 100 ms), one-step method that enables the continuous HEA NPs directly from elemental metal powders via in-flight alloying. A...

Abstract

Hydrogen represents a promising clean energy; however, the application of hydrogen energy is limited by prohibitively expensive commercial Pt/C catalyst for evolution reaction (HER). In this work, we designed non-noble high entropy alloy (HEA) catalysts FeCoNiCuMo with diversified active centers, which have an excellent catalytic performance HER. Density functional theory calculations indicate that Fe, Co, and Ni sites strong adsorption H* could facilitate water splitting, while Cu Mo weak...

Abstract The dielectric constants of salts with varying amounts water crystallization have been measured. Samples the powdered salt are suspended in a graded series mixtures two liquids which give liquid media different constants. mixture is found has same constant as salt; this determined by finding experimentally particular mixture, not changed addition salt. capacity condenser cell containing samples measured circuit crystal controlled oscillator about megacycles frequency. molecular...

Nanoscale catalyst doping is regarded as one of the most effective strategies to improve kinetics performance hydrogen storage materials, but agglomeration nanoparticles usually unavoidable during repeated de/rehydrogenation processes. Herein, hierarchically structured catalysts (Fe/C, Co/C and Ni/C) were designed fabricated overcome issue nanocatalysts applied 2LiBH4-MgH2 system for first time. Uniform transition metal (TM) (∼10 nm) wrapped by few layers carbon are synthesized pyrolysis...

LiBH4 is one of the most potential candidates for hydrogen storage materials among several sorts complex borohydrides. Utilizing reactive hydride composites on could destabilize thermodynamics and improve dehydrogenation behaviors, such as excellent reversibility LiBH4–MgH2 fast LiBH4–Al. The strategy combining both outstanding effects MgH2 Al to form LiBH4–MgH2–Al system has been proposed. However, reduction capacity during cycles not solved system, which considered principal problem. In...

Refractory high-entropy alloys (RHEAs) that consist of multiple principal refractory elements have attracted significant attention due to their many interesting and useful properties for structural applications. However, so far, a vast majority reports on RHEAs focused few well-known compositions such as NbMoTaW, NbMoTaWV, TiZrHfNbTa. The discovery new with enhanced mechanical has been highly desirable. Here we produce two RHEA thin films - TiZrHfNbTaMo TiZrHfNbTaW, by co-sputtering Mo or W...

Multiprincipal element alloys, or medium‐ and high‐entropy alloys (MEAs HEAs), hold great potential for numerous structural functional applications, yet the synthesis of such out a vast composition space is daunting task. Herein, radio frequency inductively coupled plasma (RF‐ICP) method preparing bulk MEAs HEAs in rapid high‐throughput fashion reported. Typical are successfully synthesized within 40 s per alloy, thereby greatly improving fabrication efficiency throughput. This provides new...

Nanocrystalline (nc) metals are generally strong yet thermally unstable, rendering them difficult to process and unsuitable for use, particularly at elevated temperatures. Nc multicomponent high-entropy alloys (HEAs) found offer enhanced thermal stability but only in a few empirically discovered systems out of vast compositional space. In response, this work develops combinatorial strategy accelerate the discovery nc-(TiZrHf)

Laser powder bed fusion (LPBF) of 18Ni-300 maraging steel has attracted abundant popularity in both academia and industry due to its superior mechanical properties printability. Several studies showcased the optimization process parameters based on relative density, but there is little exploration tailoring as-built microstructure. In this study, fully dense samples are fabricated with three different melting modes, they examined for cellular solidification microstructure, retained...

Quasicrystalline materials possess a unique structure that is ordered yet not periodic. Despite their special configuration and many useful properties, they are typically very brittle at temperatures below \ensuremath{\sim}75% of melting points, rendering them difficult to process often unsuitable for practical implementations. Micro-compression offers an opportunity unveil the fundamental mechanisms quasicrystal plasticity. Here, we study mechanical behavior typical icosahedral (i-Al-Pd-Mn)...

The current study examines students' ocular behaviours during a multiple choice exam. Specifically, we are interested in how students would approach item visually and whether there is attention bias due to the location of options. Participants (N = 22) were enrolled an Introductory Psychology class who had recently completed course midterm For this study, administered alternate but comparable version exam designed so that visual could be measured throughout taking. consisted 52 items with...

Laser powder bed fusion (LPBF) of 18Ni-300 maraging steel has attracted abundant popularity in both academia and industry due to its superior mechanical properties printability. Several studies showcased the optimization process parameters based on relative density, but there is little exploration tailoring as-built microstructure. In this study, fully dense samples are fabricated with three different melting modes, they examined for cellular solidification microstructure, retained...

Impossible figures, like the Penrose Rectangle, provide effective line junction information for 3-dimensional shape of object parts. What makes a display “impossible” is that parts cannot be combined into consistent whole object. Previous work has shown ability to detect impossible figures improves between 7 and 14 years age (Young & Deregowski, 1981). In contrast, in recent study 4-month-old infants were habituated cube which intersecting bars occluded by an ellipse then presented with two...

Research has shown that the perception of test difficulty can alter performance on multiple choice tests (Weber & Bizer, 2006). The current study explores whether or not perceived also an effect looking behaviours during testing. Specifically, we were interested in students' fixation and pupil size when participating a where they informed would either be easy difficult. It was hypothesized students easy, generally show less overall. In particular, these look at choices following correct...

Multi-principal element alloys, or medium- and high-entropy alloys (MEAs HEAs), hold great potential for numerous structural functional applications, yet the synthesis of such out a vast composition space is daunting task. Here, we report radio frequency inductively coupled plasma (RF-ICP) method preparing bulk MEAs HEAs in rapid high-throughput fashion. Typical are successfully synthesized within 40 s per alloy, thereby greatly improving fabrication efficiency throughput. This provides new...

Quasicrystalline materials possess a unique structure that is ordered yet not periodic. Despite their special configuration and many useful properties, they are typically very brittle at temperatures below ~75% of melting points, rendering them difficult to process often unsuitable for practical implementation. Here, we study the mechanical behavior typical icosahedral quasicrystal (i-Al-Pd-Mn) using micro-thermomechanical techniques over temperature range 25-500 °C, which has never been...

Based on the statistical properties of laser speckle, response for speckle passing through a linear shift- invariant system is studied. This paper presents method testing modulation transfer function (MTF) charge-coupled devices below Nyquist frequency. A new scattering microcrystalline glass material generates speckle. The instrument designed and test results show that this technique variable MTF measurement approach. difference each within 0.03.