Advanced Powder Technology最新文献

{"title":"Microwave sintering of lithium hydride by powder metallurgy: Grain growth kinetics and densification mechanism","authors":"Guozhen Zhao ,&nbsp;Xiaobao Zhu ,&nbsp;Zheng Xu ,&nbsp;Yunhai Ma ,&nbsp;Yuanjia Lu ,&nbsp;Yongsheng Shu ,&nbsp;Li Yang ,&nbsp;Shenghui Guo ,&nbsp;Xiaolei Ye ,&nbsp;Kaihua Chen","doi":"10.1016/j.apt.2025.104867","DOIUrl":"10.1016/j.apt.2025.104867","url":null,"abstract":"<div><div>In this study, the effect of microwave sintering on the densification and microstructure of lithium hydride (LiH) cylindrical bulk samples was investigated. The lithium hydride powders were cold pressed into cylindrical shapes and then sintered at temperatures ranging from 450 °C to 550 °C. Microwave sintering demonstrates substantial advantages in achieving accelerated densification and superior microstructural uniformity. Analyses of phase composition, bulk density and micromorphology show that microwave-sintered LiH has a denser grain structure and fewer surface pores. The change in bulk density of bulk LiH sample during microwave sintering shows that the activation temperature of densification is about 475 °C. The average grain size of the bulk LiH sample grows from 46 μm to 53.2 μm. In addition, kinetic modelling showed that microwave sintering was carried out by grain boundary diffusion with lower activation energy, resulting in improved sintering efficiency and shorter processing time. The activation energy for grain growth is 73 kJ/mol. These findings highlight the potential of microwave sintering as an energy-efficient and effective method to produce high-quality bulk LiH materials, paving the way for advanced applications in hydrogen storage and energy systems.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 6","pages":"Article 104867"},"PeriodicalIF":4.2,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783579","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}

{"title":"Experimental study on floc-bubble interaction in the flotation of drilling wastewater at the micro-scale","authors":"Xiao Ma ,&nbsp;Jian-Yi Chen ,&nbsp;Ji-Wen Xu ,&nbsp;Hao-Di Chi ,&nbsp;Yao-Dong Wei","doi":"10.1016/j.apt.2025.104873","DOIUrl":"10.1016/j.apt.2025.104873","url":null,"abstract":"<div><div>Flotation is an effective solid–liquid separation technique, in which floc-bubble interactions are crucial in determining separation efficiency. This study used polyaluminum silicate ferric (PSAF) to coagulate suspended solids (SS) in drilling wastewater, agglomerating them into flocs. The interactions between bubbles and flocs of varying sizes were observed at the micro-scale using a custom-designed system. The effects of floc size on induction time, bubble relative velocity and floc-bubble interaction force were analyzed. The results indicate that small-size flocs (=50 μm) contribute to the stabilization of the liquid film while sliding along the bubble surface. In contrast, large-size flocs (=170 μm), due to their higher settling velocities, undergo multiple ‘approach-bounce’ cycles, which significantly reduce the contact time with bubbles and impair the adhesion efficiency. As floc size increases, the induction time is markedly extended. Bubbles maintain relatively stable sliding velocities on small-size flocs, while larger flocs induce pronounced velocity fluctuations, thereby heightening the separation instability. The interaction force between the floc and the bubble increases as the deformation of the floc intensifies but subsequently decreases due to the gravity of the floc.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 6","pages":"Article 104873"},"PeriodicalIF":4.2,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769043","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}

{"title":"Composites of graphene oxide and gold Nanospheres: A dual-targeted Recognition and dual-responsive release Chemophotothermal therapeutic platform","authors":"Yijie Wang ,&nbsp;Ruolan Feng ,&nbsp;Meijuan Shi ,&nbsp;Huirui Zhu ,&nbsp;Moxuan Zhao ,&nbsp;Jinyu Li ,&nbsp;Hongqin Wang ,&nbsp;Xiaoning Li ,&nbsp;Tao Gong ,&nbsp;Rui Guo","doi":"10.1016/j.apt.2025.104874","DOIUrl":"10.1016/j.apt.2025.104874","url":null,"abstract":"<div><div>The negative effects of conventional chemotherapy have been significantly reduced in the past several years by the widespread use of nanomedicine delivery systems in conjunction with conventional liver cancer treatments. This study reports the construction of a novel multifunctional nanocomposite by attaching folic acid (FA) and triformylcholic acid (TCA) to the surface of graphene oxide-gold nanospheres (GO-AuNSs). Doxorubicin hydrochloride (DOX) was used as a model drug to form GO-AuNSs-FA-TCA@DOX on GO-AuNSs-FA-TCA, which has excellent photothermal conversion efficiency, dual-targeted drug delivery, endogenous tumor microenvironment (TME) and near-infrared light (NIR) dual-responsive drug release. More importantly, in vitro and in vivo experiments have shown that the combination therapy shows a higher therapeutic effect than chemotherapy or photothermal therapy alone. Compared with normal cells and other cancer cells, the treatment effect of liver cancer cells is stronger. Therefore, the new nano drug carrier synthesized in this paper has potential application value in the combination therapy of liver cancer.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 6","pages":"Article 104874"},"PeriodicalIF":4.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758988","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}

{"title":"Hierarchical hybrid conductive powders derived from Ag-deposited Janus particle/MWCNT nanocomposites for enhanced microwave absorption","authors":"Hengqian Jin,&nbsp;Shufei Wei,&nbsp;Yunpeng Jiang,&nbsp;Huarong Nie,&nbsp;Xinping Zhang,&nbsp;Aihua He","doi":"10.1016/j.apt.2025.104861","DOIUrl":"10.1016/j.apt.2025.104861","url":null,"abstract":"<div><div>In this study, snowman-like Janus particles (PDVB/PS@SiO₂) were proposed as carriers of Ag nanoparticles (Ag@J) to construct a hierarchical hybrid conductive powders by further admixing with MWCNTs for the development of high-performance microwave-absorbing materials. The Ag@J/MWCNT composite powders have several advantages in microwave absorption, such as the polarization of SiO₂ hemispheres, multiple reflections and scattering of electromagnetic waves in the hollow cavity of PDVB/PS hemispheres, improved conductivity and dielectric loss originating from the dense deposition of Ag nanoparticles and incorporation of MWCNTs. Furthermore, the composite powders allow the interfacial polarization and favorable impedance matching. Notably, the asymmetric hemispheres of the Ag@J particles result in close packing, further reducing the transmission of electromagnetic waves. The Ag@J particles demonstrated a minimum reflection loss (RL_min), indicating their potential application in microwave absorption. When further integrated with MWCNTs, the Ag@J/MWCNT composite powders, containing 36.4 wt% of Ag@J, exhibited strong absorption (−27 dB), wide absorption bandwidth (16.5 − 18 GHz), and a low thickness (5.5 mm). The Janus particles reported in this study show high potential applications in microwave-absorbing powder materials.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 6","pages":"Article 104861"},"PeriodicalIF":4.2,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758987","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}

{"title":"Understanding the reaction mechanisms of Mg2B2O5-Fe3O4 and Mg2B2O5-Na2CO3-Fe3O4 systems under different atmospheres","authors":"Jinxiang You ,&nbsp;Mingjun Rao ,&nbsp;Jun Luo ,&nbsp;Zhiwei Peng ,&nbsp;Guanghui Li","doi":"10.1016/j.apt.2025.104863","DOIUrl":"10.1016/j.apt.2025.104863","url":null,"abstract":"<div><div>Ludwigite ore is a strategic and characteristic resource characterized by its multi-mineral intergrowth, serving as the primary raw material for the current boron industry in China. However, its comprehensive and efficient utilization presents challenges due to the complex mineralogical composition and mineral associations. Mineral phase reconstruction of ludwigite ore through soda-ash roasting has proven to be an efficient approach for activating and separating boron and iron. Nevertheless, the transformation behavior of boron and iron and physicochemical properties of reaction products are significantly affected by the amount of soda-ash and the roasting atmosphere, and the underlying reaction mechanism remains unclear. In this study, the reaction behaviors of Mg₂B₂O₅-Fe₃O₄ and Mg₂B₂O₅-Na₂CO₃-Fe₃O₄ systems under different roasting atmospheres were investigated to better understand the reaction mechanism involved in the soda-ash roasting of ludwigite ore. The results showed that Fe₃O₄ was oxidized to Fe₂O₃ and it hardly reacted with Mg₂B₂O₅, while in the presence of soda-ash, it reacted with Mg₂B₂O₅ to generate NaBO₂ and MgO, and then Fe₂O₃ further reacted with MgO to form MgFe₂O₄ (air atmosphere). The roasting behavior under nitrogen and weakly reducing atmospheres was found to be similar. In the absence of soda-ash, Fe₃O₄ showed a slight reaction with Mg₂B₂O₅, resulting in the formation (Mg, Fe)₂FeBO₅ by solid–solid interfacial reaction. When soda-ash was present, Mg₂B₂O₅ reacted with Na₂CO₃ to yield NaBO₂ and MgO, after which Fe₃O₄ further reacted with MgO to form Mg<em>_x</em>Fe_3-<em>_x</em>O₄ and Mg_yFe_1-yO via isomorphic substitution.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 6","pages":"Article 104863"},"PeriodicalIF":4.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747758","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}

{"title":"Study on the regulation of thermal decomposition of ammonium perchlorate by energetic composites formed with Fe-based coordination polymers","authors":"Yan Zhao ,&nbsp;Xing Zhou ,&nbsp;Hongfeng Ji ,&nbsp;Bian Li ,&nbsp;Wei Zhou ,&nbsp;Yao-Hua Liu ,&nbsp;Guixi Liu","doi":"10.1016/j.apt.2025.104865","DOIUrl":"10.1016/j.apt.2025.104865","url":null,"abstract":"<div><div>This study focuses on the thermal decomposition regulation behavior of AP achieved by Fe5B/AP nanoparticles, which are characterized using XRD, XPS and other techniques. When the mass ratio of Fe5B catalyst to AP was 3: 1, the high-temperature peak associated with AP decomposition advanced significantly by 181 ℃, resulting in a more concentrated exothermic process. Additionally, solid propellant containing an optimal mass ratio of 1: 3 for Fe5B to AP exhibited higher burning velocity compared to Fe₂O₃ under low pressure condition with a 10 % increase in burning rate. Within the pressure range from 3.0 MPa to 9.0 MPa, the combustion rate of solid propellant containing Fe5B/AP (1: 3) remained similar to that achieved with Fe₂O₃ but displayed a lower pressure index. The mechanistic studies show Fe-based structural units and active metal centers served as intermediates for electron transfer,expediting electron transfer between ClO₄^- and NH₄⁺ in the LTD process. Fe5B/AP particles generate iron oxides in situ, facilitating the adsorption of oxygen species and promoting increased heat release during the HTD stage. These findings highlight the potential application of Fe5B/AP as combustion catalysts for solid propellants by enabling controlled decomposition behavior of ammonium perchlorate.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 5","pages":"Article 104865"},"PeriodicalIF":4.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735085","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}

{"title":"Elucidating relationship between particle moisture and coating characteristics in a Wurster fluidized bed","authors":"Jinnan Guo,&nbsp;Daoyin Liu,&nbsp;Jiliang Ma,&nbsp;Cai Liang,&nbsp;Xiaoping Chen","doi":"10.1016/j.apt.2025.104868","DOIUrl":"10.1016/j.apt.2025.104868","url":null,"abstract":"<div><div>Spray fluidized beds are widely used for coating particles; however, optimization of operation parameters based on the assessment of numerous coating characteristics is inefficient. In this study, the particle moisture content is used as a rapid indicator to optimize the coating quality. Porous Al₂O₃ particles are coated with silica sol in a Wurster fluidized bed with different fluidizing gas temperatures, liquid spray rates, fluidizing gas velocities and solid mass fractions. The effects on particle moisture content and key coating characteristics, including the coating efficiency, particle size, shell morphology and shell porosity, are investigated. By increasing the fluidizing gas temperature and velocity, or decreasing the liquid spray rate and solid mass fraction, the particle moisture content decreases. When the particle moisture content is low, the coated particles have a relatively smooth surface with low shell porosity, and the coating exhibits high efficiency and good uniformity. Based on these results, one coating process is conducted with particle moisture content being monitored, resulting in improved coating quality.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 6","pages":"Article 104868"},"PeriodicalIF":4.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734734","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}

{"title":"Inhibition effect and reaction mechanism of NaHCO3 and NH4H2PO4 on the deflagration of methane/coal dust mixtures","authors":"Jiachen Wang ,&nbsp;Haitao Li ,&nbsp;Fuer Zhai ,&nbsp;Jie Li ,&nbsp;Minggao Yu","doi":"10.1016/j.apt.2025.104866","DOIUrl":"10.1016/j.apt.2025.104866","url":null,"abstract":"<div><div>To enrich the explosion suppression theory of methane/coal dust hybrid deflagration with different traditional powder inhibitors, this study investigates the inhibitory effects and mechanisms of NaHCO₃ and NH₄H₂PO₄ powder inhibitors on the deflagration of methane/coal dust hybrids. Visual deflagration tests were performed on long-flame, coking, and anthracite coals mixed with 9.5 vol% methane, focusing on flame propagation, pressure evolution, and residue characteristics. Macro and micro experiments demonstrate that NaHCO₃ effectively inhibits low-volatile coal dust/methane deflagration by reducing the kinetic growth rate (<em>K</em>_G) of the anthracite coal/methane mixture (AMM) by 90 %, through the formation of stable particles on coal surfaces that hinder pyrolysis. NH₄H₂PO₄, which exhibits greater efficacy with other coal types, decreases the kinetic growth rate (<em>K</em>_G) of the long-flame coal/methane mixture (LMM) by 73.9 % by producing small molecules that inhibit the formation of intermediate products. Reaction kinetic simulations demonstrated NaHCO₃ inhibits •O radicals via the reaction •NaO+•O=•Na + O₂, while NH₄H₂PO₄ suppresses •H radicals through the reaction •PO₂+•H +•M =•HOPO+•M.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 5","pages":"Article 104866"},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725728","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}

{"title":"Numerical and experimental Investigation of coal pillar crushing and spontaneous combustion in shallow and closely spaced coal seams","authors":"Lulu Sun ,&nbsp;Jialong Yang ,&nbsp;Zhiguo Guo ,&nbsp;Quanlin Shi ,&nbsp;Guansheng Qi ,&nbsp;Fengge Zhou","doi":"10.1016/j.apt.2025.104848","DOIUrl":"10.1016/j.apt.2025.104848","url":null,"abstract":"<div><div>Coal spontaneous combustion is one of the major hazards in coal mines. During shallow and closely spaced coal seam mining, the coal pillar crushing and oxidation inside the goaf are difficult to determine, making it impossible to accurately predict coal pillar spontaneous combustion and determine goaf fire prevention and extinguishing indicators. Therefore, this paper analyzes the influence of lower working face mining on the plastic zone distribution and oxidation characteristics of the coal pillar in the upper coal seam based on numerical simulation, experimental research, and other means. The study found that as the closely spaced coal seam advances, the deformation characteristics of the upper coal seam coal pillar can be roughly divided into three stages: intact and stable, deformed and damaged, and crushed and unstable. The damaged and oxidized coal pillars have an earlier critical temperature point for CO and C₂H₄ by 10–20 °C during secondary oxidation, and the lower oxygen concentration limit of the coal decreases. After the coal pillar is crushed and oxidized, the surface structure becomes rougher, increasing the contact area with oxygen. The proportion of oxygen-containing functional groups inside the coal increases, and the oxidation activity of the coal increases. This shows that the coal pillar crushing process has a certain promoting effect on coal oxidation. The research results reveal the influence of shallow and closely spaced coal seam mining on the crushing and oxidation spontaneous combustion of the upper coal seam, which has certain guiding significance for fire prevention and extinguishing work in shallow and closely spaced coal seams.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 5","pages":"Article 104848"},"PeriodicalIF":4.2,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706287","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}

{"title":"A hybrid deep learning scheme with high accuracy for tracking aeolian saltating particles in high-speed pictures","authors":"Chuan Lin ,&nbsp;Fanmin Mei ,&nbsp;Hongji Zhou ,&nbsp;Mengjie Pu ,&nbsp;Hongda Chen ,&nbsp;Jin Su ,&nbsp;Jinguang Chen","doi":"10.1016/j.apt.2025.104862","DOIUrl":"10.1016/j.apt.2025.104862","url":null,"abstract":"<div><div>Traditional saltating particle tracking algorithms (SPTs) for revealing the evolution of aeolian saltation may have lower ensemble recall rates (∼30 %) under moderate particle concentrations (∼100 particles per frame). For this reason, we propose a hybrid deep learning approach for tracking saltating particles, termed YOLOv8-IKFH, which integrates YOLOv8 for particle recognition with an improved Kalman filter and Hungarian algorithm (IKFH) for particle association in high-speed pictures. In our validation experiment, it shows that YOLOv8-IKFH can achieve the highest accuracy (∼93 %), recall rate (∼95 %), ensemble recall rate (∼50 %), and the longest average track length (35 particle locations per track) compared with the published SPTs due to optimal integration of particle recognition and association strategies like two-parameter constraint. In summary, the present work provides valuable insights for the development of future SPTs and a potential tool for deeply understanding the saltation process under strong winds.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 5","pages":"Article 104862"},"PeriodicalIF":4.2,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706288","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}