Advanced Powder Technology最新文献_第2页

Development of design method for wet stirred ball milling by simulation using DEM 利用 DEM 仿真开发湿式搅拌球磨设计方法

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-22 DOI: 10.1016/j.apt.2024.104689

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Microwave absorption of FeCo-C core–shell nanoparticles with tunable thickness of C shells and the underlying mechanism C壳厚度可调的FeCo-C核壳纳米粒子的微波吸收及其机理

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-22 DOI: 10.1016/j.apt.2024.104694

{"title":"Microwave absorption of FeCo-C core–shell nanoparticles with tunable thickness of C shells and the underlying mechanism","authors":"","doi":"10.1016/j.apt.2024.104694","DOIUrl":"10.1016/j.apt.2024.104694","url":null,"abstract":"<div><div>In order to address the key question of how the thickness of the C shell affects the microwave absorption properties of metal-C core–shell nanoparticles, FeCo-C core–shell nanoparticles, with identical metal cores but varied carbon shell thicknesses, were synthesized by simply annealing FeCo-C core–shell nanoparticles in air. The free electronic-polarization theory was employed, and thus the polarization storage dependence of the loss plot, <em>i.e.</em>, <span><math><mrow><msubsup><mi>ε</mi><mrow><mi>p</mi></mrow><mo>′</mo></msubsup><mo>-</mo><msubsup><mi>ε</mi><mrow><mi>p</mi></mrow><mrow><mo>\"</mo></mrow></msubsup></mrow></math></span> was introduced to elucidate the underlying microwave absorption mechanism. It was found that permittivities, conduction and polarization losses degrade as the carbon shell becomes thinner. Meanwhile, the thickness of the C shells was well adjusted to tune the magnetic resonance frequencies and intensities of the nanoparticles. Notably, a thicker C shell enhances the complete polarization relaxation process and increases polarization loss. Due to optimal dielectric and magnetic properties, FeCo-C nanoparticles exhibit an optimal reflection loss value up to −72.2 dB and an effective absorption bandwidth of 7.6 GHz at 3.5 mm. These results indicate that the synthesized FeCo-C core–shell nanoparticle is a promising candidate for microwave absorption applications. Furthermore, the introduction of <span><math><mrow><msubsup><mi>ε</mi><mrow><mi>p</mi></mrow><mo>′</mo></msubsup><mo>-</mo><msubsup><mi>ε</mi><mrow><mi>p</mi></mrow><mrow><mo>\"</mo></mrow></msubsup></mrow></math></span> plot is expected to have a significant impact on the field of microwave absorption.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Combined (CO2 + CO) hydrogenation with methanolysis using aerosol metal-organic framework-derived hybrid catalysts 使用气溶胶金属有机框架衍生混合催化剂进行（CO2 + CO）加氢与甲醇分解联合反应

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-21 DOI: 10.1016/j.apt.2024.104696

{"title":"Combined (CO2 + CO) hydrogenation with methanolysis using aerosol metal-organic framework-derived hybrid catalysts","authors":"","doi":"10.1016/j.apt.2024.104696","DOIUrl":"10.1016/j.apt.2024.104696","url":null,"abstract":"<div><div>This study introduces a novel one-pot reaction system that efficiently converts greenhouse gases into methanol while simultaneously processing polyethylene terephthalate (PET) into dimethyl terephthalate (DMT) and ethylene glycol (EG). Our approach involves the development of hybrid materials derived from metal-organic frameworks (MOFs) using an aerosol-assisted synthesis method. These catalysts, which include a Cu/ZnO active phase on various supports, are optimized for the hydrogenation of both carbon monoxide (CO) and carbon dioxide (CO<sub>2</sub>). By integrating PET methanolysis with the (CO<sub>2</sub> + CO) hydrogenation process, we achieved a significant enhancement in conversion ratios, exceeding 2.5 times their individual values. This synergistic approach effectively addresses the challenges posed by both plastic waste and greenhouse gas emissions. An impressive space–time yield of 5.6 mmol g<sub>cat</sub><sup>−1</sup>h<sup>−1</sup> and selectivity of 92 % for DMT production were achievable under optimized conditions. These results highlight the effectiveness of MOF-derived catalyst materials in facilitating complex chemical transformations and contribute significantly to environmental sustainability. This dual-function system offers a practical solution for the utilization of plastic waste and greenhouse gases, marking an important step toward a circular economy.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Investigating the effect of mechanical activation duration (MAD) on the microstructure and corrosion behavior of TiAl intermetallic compounds 研究机械活化持续时间 (MAD) 对 TiAl 金属间化合物微观结构和腐蚀行为的影响

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.apt.2024.104690

{"title":"Investigating the effect of mechanical activation duration (MAD) on the microstructure and corrosion behavior of TiAl intermetallic compounds","authors":"","doi":"10.1016/j.apt.2024.104690","DOIUrl":"10.1016/j.apt.2024.104690","url":null,"abstract":"<div><div>An innovative method for fabrication and investigating the effect of mechanical activation duration (MAD) on the properties of TiAl alloys was developed. The study employs an efficient implementation of combustion reactions in a compressed, mechanically activated mixture of titanium and aluminum, leading to the synthesis of titanium aluminide (TiAl). The induction-activated method initiates an exothermic reaction between Ti and Al, facilitating simultaneous preheating and ignition under an argon gas atmosphere. The accomplishment of the synthesis process lasted very short times, and the products were characterized using X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS) techniques. The investigation focuses on samples with MAD durations ranging from 1 to 10 h, revealing that higher MADs (4 to 10 h) result in an innovative microstructure with α<sub>2</sub> (Ti<sub>3</sub>Al)/γ (TiAl) round-shape lamellar grains embedded in the γ (TiAl) matrix. This microstructure enhances the toughness of TiAl alloys while maintaining comparable hardness. The study indicates that increasing MAD from 1 to 10 h improves reaction kinetics, leading to a rise in reaction front velocity from 3.95 to 5.02 mm s<sup>−1</sup> and a reduction in α<sub>2</sub> (Ti<sub>3</sub>Al)/γ (TiAl) round-shape lamellar grain size from 215.804 to 172.709 μm in a more homogeneous arrangement. Furthermore, corrosion behavior analysis for samples with 1 and 10 h MAD reveals an increase in the resistance of the oxide layer (R<sub>f</sub>) value from 702.9 to 43111 Ω.cm<sup>2</sup> and the charge transfer resistance (R<sub>ct</sub>) value from 41.84 to 18520 Ω.cm<sup>2</sup>.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancement of luminescence and thermal stability in Eu3+-doped K3Y(BO2)6 with Li+ and Na+ co-doping 掺杂 Li+ 和 Na+ 的 Eu3+ 掺杂 K3Y(BO2)6 的发光性能和热稳定性的增强

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.apt.2024.104695

{"title":"Enhancement of luminescence and thermal stability in Eu3+-doped K3Y(BO2)6 with Li+ and Na+ co-doping","authors":"","doi":"10.1016/j.apt.2024.104695","DOIUrl":"10.1016/j.apt.2024.104695","url":null,"abstract":"<div><div>Eu<sup>3+</sup>-doped and Li<sup>+</sup>/Na<sup>+</sup> co-doped K<sub>3</sub>Y(BO<sub>2</sub>)<sub>6</sub> (KYBO) phosphors were synthesized through a microwave-assisted sol–gel method, and their structural and photoluminescent (PL) characteristics were examined. X-ray diffraction (XRD) and Rietveld refinement confirm effective dopant incorporation and preservation of the crystalline structure. Fourier Transform Infrared (FTIR) spectroscopy indicates the maintenance of the borate structure, confirming the structural integrity of the phosphors upon doping. The addition of Li<sup>+</sup> and Na<sup>+</sup> co-dopants notably enhances luminescent efficiency and thermal stability, making these phosphors promising candidates for solid-state lighting (SSL) applications. PL analysis reveals strong red emission peaks at 612 nm, attributed to the <sup>5</sup>D<sub>o</sub> → <sup>7</sup>F<sub>2</sub> transition of Eu<sup>3+</sup> ions. The study indicates that electric dipole-quadrupole interactions are the primary mechanism for energy migration, with a critical distance of approximately 22.68 Å. This mechanism contributes to concentration quenching at higher doping levels. High temperature PL measurements indicated an activation energy of 0.1389 eV for thermal quenching in the Li<sup>+</sup> co-doped sample. Additionally, the Na<sup>+</sup> co-doped sample exhibited an abnormal thermal stability behavior, with an even higher activation energy of 0.2536 eV. This suggests that Na<sup>+</sup> co-doping significantly enhances the thermal resilience of the phosphor, making it more suitable for high-power light-emitting applications that operate under extreme conditions. CIE chromaticity diagrams highlight the potential for optimizing Eu<sup>3+</sup> doping levels, combined with Li<sup>+</sup> and Na<sup>+</sup> co-doping, to improve luminescent performance and thermal stability for advanced SSL applications.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Exploration on the mechanism of enhancing flotation of long-flame coal by diesel modification via oxidation 柴油氧化改性增强长焰煤浮选机理探讨

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.apt.2024.104699

{"title":"Exploration on the mechanism of enhancing flotation of long-flame coal by diesel modification via oxidation","authors":"","doi":"10.1016/j.apt.2024.104699","DOIUrl":"10.1016/j.apt.2024.104699","url":null,"abstract":"<div><div>Low-rank coal is naturally hydrophilic, and the traditional hydrocarbon collectors often have poor performance in its flotation. In this study, the modification of diesel was conducted using an instantaneous gasification-oxidation-condensation device for the expected improvement of collector’s performance. Experimental analyses and interfacial interaction calculation were performed to explore the mechanism of enhancing flotation of long-flame coal by diesel modification. It indicated that the flotation of coal sample can be greatly enhanced by the modified diesel, and a combustible matter recovery of 90.52 % could be attained only consuming 6 kg/t of modified diesel which was far better than the flotation effect consuming 100 kg/t of common diesel. The improved flotation effect of the coal sample could be attributed to the increased polarity of collector from 0.48 % to 9.76 % resulted from the newly added oxygenated functional groups after the oxidation of diesel, which significantly enhanced the adsorption capacity of the collector on the long-flame coal surface reflected by the FTIR and XPS analyses. Furthermore, the calculated results of interfacial interaction between the coal sample and the common/modified diesel suggested that the efficient adsorption of modified diesel on the coal sample was achieved through the bridging role acted by water molecules. This research may give some insight into enhancing flotation of low-rank coal.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Euler-Euler hydrodynamic modelling and simulation of dense particle flow in a small-scale fluidized bed 小尺度流化床中密集颗粒流动的欧拉-欧拉流体力学建模与模拟

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-17 DOI: 10.1016/j.apt.2024.104691

{"title":"A Euler-Euler hydrodynamic modelling and simulation of dense particle flow in a small-scale fluidized bed","authors":"","doi":"10.1016/j.apt.2024.104691","DOIUrl":"10.1016/j.apt.2024.104691","url":null,"abstract":"<div><div>Large eddy simulation of dense particle flow in fluidized bed is an advanced strategy to acquire a better understanding mechanism of gas-particle two-phase turbulent flow. A novelty particle stress model at subgrid scale level based on the Euler-Euler two-fluid frame is proposed to consider the effect of gas flow on particle dynamics. Anisotropic dispersion of interactions between gas and particle is modeled by a developed second-order moment approach, the four-way coupling is used to combine the particle–particle collisions by using the particle granular temperature based on the kinetic theory of granular flow. Numerical simulation is carried out in a small-scale fluidized bed and predictions are well agreed with the experimental data. Results show that the evolution of core-annular flow structure is captured. Increased superficial gas velocity is favorable for the enhancement of bubble hydrodynamics and anisotropic particle dispersions. At the 4u<sub>mf</sub>, Bubblelike granular temperature is 11.2 times larger than particle granular temperature, and mean and standard deviation values of axial particle velocity are approximately 2.2 times and 1.5 times larger than those of 2u<sub>mf</sub>. Bubble motions have a great effect on the heterogeneous flow pattern, particle dynamics and the redistribution of particle Reynolds stresses.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142445318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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DEM investigation of particle gradation effect on the stress-dilatancy behavior of granular soil 颗粒级配对粒状土应力-膨胀行为影响的 DEM 研究

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.apt.2024.104692

{"title":"DEM investigation of particle gradation effect on the stress-dilatancy behavior of granular soil","authors":"","doi":"10.1016/j.apt.2024.104692","DOIUrl":"10.1016/j.apt.2024.104692","url":null,"abstract":"<div><div>Particle gradation effect on the shear-dilatancy of granular soils was studied through a series of drained triaxial tests using the discrete element and finite difference methods (PFC<sup>3D</sup>-FLAC<sup>3D</sup>). Spherical particles with different coefficients of uniformity <em>C<sub>u</sub></em> and median particle sizes <em>D</em><sub>50</sub> were assembled to exclude the strong size-shape correlation in natural sands. Four groups of <em>C<sub>u</sub></em> and four groups of <em>D</em><sub>50</sub> at the same void ratio <em>e<sub>c</sub></em> prior to shearing, and seven more groups with the same void ratio <em>e</em><sub>0</sub> prior to isotropic compression were tested. Various mechanical behaviors were analyzed, including the stress–strain response, the stress-dilatancy response, friction angle, and fabric anisotropy. <em>C<sub>u</sub></em> significantly influences the peak friction angle, the maximum dilation angle, and the anisotropies of normal contact force and contact normal, whereas these are almost independent of <em>D</em><sub>50</sub>. The contribution of the maximum rate of dilation to the excess friction angle is largely independent of <em>C<sub>u</sub></em> and <em>D</em><sub>50</sub> for spherical particles.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fluoride- and OSDA-free synthesis of ZSM-5 with controllable b-axis orientation: Insights into the role of medium alkalinity and seed induction 具有可控 b 轴取向的 ZSM-5 的无氟和无 OSDA 合成：对培养基碱度和种子诱导作用的见解

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.apt.2024.104698

引用次数: 0

Rapid synthesis of environmentally friendly submicron K2SiF6:Mn4+ phosphors: Advancing micro-LED technology 快速合成环保型亚微米 K2SiF6:Mn4+ 荧光粉：推进微型 LED 技术

IF 4.2 2区工程技术

Advanced Powder Technology Pub Date : 2024-10-12 DOI: 10.1016/j.apt.2024.104687

{"title":"Rapid synthesis of environmentally friendly submicron K2SiF6:Mn4+ phosphors: Advancing micro-LED technology","authors":"","doi":"10.1016/j.apt.2024.104687","DOIUrl":"10.1016/j.apt.2024.104687","url":null,"abstract":"<div><div>The development of light-emitting diode (LED) technology has intensified the requirements for the particle size of the K<sub>2</sub>SiF<sub>6</sub>:Mn<sup>4+</sup> phosphor. However, the synthesis technology of the K<sub>2</sub>SiF<sub>6</sub>:Mn<sup>4+</sup> phosphor possessing small particle sizes remains underdeveloped, rendering it difficult to fulfill the development requirements of display technology. This study presents an ammonium salt–assisted synthesis strategy for the rapid and hydrofluoric acid–free synthesis of submicron-sized K<sub>2</sub>SiF<sub>6</sub>:Mn<sup>4+</sup>, achieving an internal quantum yield of 98 % and average particle size of ∼ 200 nm. The synthesized material demonstrates excellent thermal stability, and its luminous intensity at 423 K is 136 % higher than that at 298 K, which is attributed to a negative thermal quenching effect. A high-performance white LED prepared using the as-developed material as the red-light-generation component exhibited a luminous efficacy of 113 lm/W and color rendering index of 93. Furthermore, the fluorescent inks developed using the prepared submicron phosphors can be utilized for screen printing. In summary, this study introduces a method for the ecofriendly, efficient, and cost-effective synthesis of submicron Mn<sup>4+</sup>-doped fluoride phosphors. Moreover, it presents a potential red fluorescent material for application in the development of full-color micro-LEDs.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.2,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0