ABSTRACT The evolution law of fluid and solid motion in the initial stage of spiral separation process is critical for mineral particle separation. The current research intends to investigate the fluid and particle motion behaviors in the initial stage of a spiral separation process using a CFD-DEM approach. The results show that the motion behaviors of fluids and particles in the initial stage of

A multilayer metamaterial absorber (MMA) with optically transparent and broadband microwave absorption characteristics based on Indium Tin Oxide (ITO) and polymethyl methacrylate (PMMA) was designed and fabricated. The microwave absorption properties can be regulated by the resistance of ITO and the structural parameters of the unit cell. In the frequency range of 2.64-18 GHz, more than 90% microwave

In this work, we examined the microstructure evolution, as well as the micromechanical and magnetic properties of FeCoNiAlSi high-entropy alloys (HEAs) under high pressure solidification (HPS). According to the results, FeCoNiAlSi alloy solidified at 0.1 MPa (atmospheric pressure) contains three kinds of phases: grain boundary (GB)phases, peritectic phases, and primary phases. As the solidification

Zinc Telluride, a wide bandgap semiconductor, is a promising candidate material for a number of optoelectronic applications. It is important to accurately characterize the effects of point defects on this material and how they may impact its performance. In this work, GGA+U density functional theory calculations were employed to study point defects in ZnTe. Vacancies, interstitials, and anti-site defects

Transition metal dichalcogenides have gained renewed attention as promising thermoelectric materials primarily because of their unique structures and superior electronic properties. In this study, we investigate the electrical transport properties of a series of Hf(Se,Te)2 samples (Hf(SexTe1-x)2, x = 0, 0.025, 0.25, 0.375, 0.5, and 1). All the samples together form a single phase of a complete solid

Deformation-induced martensitic transformation in Fe-Co-Ni-Cr-Mn high entropy alloy (HEA) thin film with nanocolumnar growth feature are revealed to readily occur at intermediate deposition power rather than low and high deposition power ranges. The high probability of deformation-induced martensitic transformation from face-centered cubic (FCC) to hexagonal close-packed (HCP) phase in 150 W-film results

An efficient Ho:SrF2 single-crystal fiber (SCF), lightly Ho-doped to a concentration of 0.5 at.%, was successfully grown using the temperature gradient technique, and its laser characteristics were studied. Several optical parameters of the Ho:SrF2 SCF were determined using the Judd-Ofelt (J-O) theory, including the J-O intensity parameters, radiative lifetimes, and fluorescence branching ratios. In

Electrocatalytic hydrogenation (ECH) has been used as a novel approach for the synthesis of organic compounds. Hence, ZIF-67 was selected as a precursor in this study to synthesize a series of electrodes. The ECH effects were assessed on pyridine and diazines. The results showed a significant influence of carbonization temperature and time on the electrocatalyst activity. A temperature of 400 oC was

Shape memory alloys (SMAs) are considered as one of the most important smart materials for the future biomedical applications in consideration of the rapid world population aging. The promising Ti–Au–Cr–Ta alloys, which are good in biocompatibility, excellent in X–ray contrast, and high in corrosion resistance, were synthesized and evaluated in this study for realizing new biomedical materials. The

The response of heat-treatment of an Al-5Mg2Si-2Mg alloy fabricated by laser assisted powder bed fusion (LPBF) was investigated for microstructural evolution and mechanical properties. The results showed that the as-LPBFed Al-5Mg2Si-2Mg alloy was featured by the refined compact Al-cells and the divorced Mg2Si eutectic network. After solution at 490 ºC for 1 h, the Mg2Si eutectics were broken to form

As a promising thermoelectric material at the medium temperature range, PbTe has attracted much attention during the past several decades. In this study, Ga-doped PbTe single crystals were synthesized by a facile Pb-flux method. The electronic structure calculations reveal that Ga substitution can introduce impurity level in the bandgap, which can effectively modulate the carrier concentration and

InSb has superior electronic transport with low bandgap and high mobility of charge carriers, however, its high lattice thermal conductivity makes it less applicable for thermoelectric applications. Herein we report an effective approach to simultaneously enhance the power factor and reduce total thermal conductivity by isoelectronic doping of Bi for Sb. A series of polycrystalline InSb1-x Bix is prepared

High energy density, power density and long cycle life are the ultimate goals of lithium ion batteries (LIBs) to meet the need of energy storage. However, it is still a challenge to achieve them at the same time. In this work, Bi2Se0.5Te2.5/S, N-doped reduced graphene oxide (rGO) nanosheets composite has been synthesized by solvothermal method and investigated as anode materials for LIBs. The nanosheets

In this paper, a three-dimensional (3D) self-crumpled carbon nanoarchitectonics has been synthesized by GO-assisted carbonization, where GO not only serves as a template but also as a catalyst for carbonization of glucose (GLC). It is revealed that dehydration condensation reaction between -OH of GLC and -COOH of GO induces the anchoring of GLC on the surface of GO under high temperature and acidic

Constructing bimodal grain structure is a promising approach to achieve the high strength-ductility synergy in Mg alloy. Formation of bimodal grain is closely related to the dynamic and/or static recrystallization process, which has not been fully understood in the typical Mg-RE based alloy. In this work, it is claimed for the first time that the minor Ce addition (∼0.3 wt%) into Mg matrix significantly

Grain refinement usually makes the materials stronger, while ductility has a dramatic loss. Here, a superior tensile strength–ductility synergy in a fully recrystallized ultrafine-grained (UFG) Al0.1CrFeCoNi with abundant annealing twins was achieved by cold rolling at room temperature and short-time annealing. The microstructure characterization using electron backscattered scattering diffraction

In this work, the thermal conductivity of alkaline earth borate melts was measured using hot-wire method from 1323 to 1623 K, and the thermal diffusivity was extrapolated from the thermal conductivity and heat capacity. The compositional dependence of thermophysical properties was interpreted according to the structure in short-range and intermediate-range order. Based on the Raman spectroscopy, X-ray

In this study, an Al–based composite reinforced with nanometric γ–Al2O3 and submicron AlB2 particles was fabricated via chemical reactions between Al and boron oxide, followed by hot extrusion. The volume fraction of in–situ formed γ–Al2O3 and AlB2 is 11.2 vol.% and 6.3 vol.%, respectively. The average size of γ–Al2O3 and AlB2 is around 50 nm and 500 nm, respectively, and the α–Al grain is 1.26 μm

Laser solid forming (LSF) was used to fabricate dense and crack-free specimens from solution-strengthened nickel-based superalloy GH3536 in this study. Tensile, and fatigue crack growth (FCG) testing was carried out in both horizontal and vertical build orientations with the condition at 25℃ and 500℃. Three regions can be detected in the specimen: the additive manufacturing zone (AM), the heat affected

Soft magnetic materials with a nanocrystalline structure are significant from an application and scientific point of view. This article presents the possibility of obtaining nanocrystalline Fe76-xNi10B14Cux alloy with magnetic properties modified by ultra-rapid annealing (URA). The work is focused on thermodynamic calculations to determine the alloy's optimal copper content and achieving soft magnetic

In the present work, a series of Nb-Ta-W and Nb-Ta-W-Hf refractory multi-principal element alloy thin films were fabricated by multi-target direct current magnetron co-sputtering. The ternary Nb-Ta-W thin films displayed a single BCC solid solution structure with the flake-like surface morphologies and a double-layer structure for cross sections with a columnar upper layer and an amorphous layer near

The objective of this study was to comprehensively investigate and compare PCBM/ZnO and C60/BCP-based electron transport layers (ETLs) (well recognized as representative ETLs) between perovskite and metal electrode in perovskite solar cells (PeSCs) for high-performance p-i-n structure PeSCs. Their film characteristics and their effects on solar cell performances were studied. When PCBM/ZnO was used

In the present study, a novel titanium matrix composite with a quasi-network structure was successfully fabricated via the hot-press sintering of the TC4 powder and Ti2AlC precursor at 1200 ℃ and 25 MPa. To explore the effect of the Ti2AlC content on the microstructure and properties of the prepared composites, 1–8 vol% Ti2AlC was selected as the representative samples. Microstructural analysis showed

In this work, we demonstrate a giant elastocaloric effect in a Ni50Mn33In14Si1Cu2 alloy. Owing to the large transformation entropy change and low thermal hysteresis, giant adiabatic temperature change (ΔTad) of -18.2 K is obtained on unloading from a maximum compressive strain of 6% with a low stress of 145 MPa. Moreover, large specific adiabatic temperature variation (ΔTad/σmax) up to 126 K/GPa has

In order to surmount the poor stability and low utilization efficiency of Pt catalysts, the Pt-Ru bimetallic nanoparticles/polyaniline/multi-walled carbon nanotube composites (PRPM) were fabricated. Structural characterization data by transmission electron microscope, scanning electron microscope, spherical aberration corrected transmission electron microscope, X-ray photoelectron spectroscopy analysis

We report free-standing bimetallic nanoporous CuAg (NPCuAg) structures prepared via a facile one-step electrochemical dealloying proccess. The Ag/Cu ratio and the thickness of the NPCuAg structures could be tuned by the composition of the corresponding metallic glass (MG) precursors and dealloying time. All dealloyed samples exhibited a uniform three-dimensional bi-continuous nanoporous structure and

Near-equiatomic, ordered iron-rhodium (FeRh) alloy is a fundamentally interesting material that may become useful in niche applications making use of its unique magneto-functional phenomena, for example, the giant inverse magnetocaloric effect near room temperature associated with sharp first-order magnetic phase transition. The nearly discontinuous antiferromagnetic-ferromagnetic phase transformation

The twin-wire arc additive manufacturing (TWAAM) technology is an effective method for the in-situ fabrication of Ti2AlNb-based alloys relative to conventional cast and wrought routes. However, composition segregation is still challenging in the field of in-situ TWAAM. To homogenize the chemical composition, here we proposed a novel single droplet pre-alloying transfer mode of TWAAM based on the original