Advanced Powder Technology最新文献

{"title":"Effect of local erosion on flow pattern and particle self-rotation in a cyclone separator","authors":"Jianbo Zhao ,&nbsp;Xiuxun Hao ,&nbsp;Xiaohan Guo ,&nbsp;Fei Gao ,&nbsp;Junling Fan ,&nbsp;Pan Zhang ,&nbsp;Guanghui Chen","doi":"10.1016/j.apt.2025.104949","DOIUrl":"10.1016/j.apt.2025.104949","url":null,"abstract":"<div><div>Erosion is an inevitable problem of cyclone separator, and serious erosion will greatly affect the movement of the particles. To improve the understanding of the particle self-rotation in cyclone separator, in this research, we explored the influence of local wall erosion on local vortices and particle self-rotation in cyclone separators, leveraging coupled CFD and DEM simulations. The numerical results show that as erosion thickness grows in the cylinder, particle self-rotation decreases. Particles are prone to aggregation within the cone, which significantly affects their self-rotation speed. When the erosion thickness is only 2 mm or 5 mm, the slight deformation of the wall surface helps break up particle agglomeration, thereby increasing the particle self-rotation speed. However, when the erosion thickness reaches 10 mm or 15 mm, severe wear and deformation create deeper grooves, which promote particle aggregation (the particle self-rotation speed decreases by 7.2 % and 19.9 % respectively, compared to the cyclone separator without wear). Meanwhile, the larger erosion thickness spawns local vortices that alter particle motion trajectory and make them more likely to be captured by internal quasi-forced vortex.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104949"},"PeriodicalIF":4.2,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185152","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":"An effective strategy for synthesizing spinel NixMn1-xFe2O4 by oxidation roasting technology: Synergetic reaction and phase evolution behavior","authors":"Jiaqi Wen ,&nbsp;Chenghong Liu ,&nbsp;Lihua Gao ,&nbsp;Zhijun He","doi":"10.1016/j.apt.2025.104951","DOIUrl":"10.1016/j.apt.2025.104951","url":null,"abstract":"<div><div>An oxidation roasting technology has been reported as an effective technology for successfully synthesizing nickel manganese ferrite Ni_xMn_1-xFe₂O₄ (0 &lt; x &lt; 1) with a spinel crystal structure. The experimental results demonstrated the successful synthesis of nickel manganese ferrite Ni_0.5Mn_0.5Fe₂O₄ samples with relatively high purities at an oxidation roasting temperature of 1200 °C for 2 h with a Ni:Mn:Fe molar ratio of 1:1:4. The synthesized samples exhibited a magnetization saturation (Ms) value of 53.71 emu/g, a coercivity (Hc) value of 34.88 Oe, and a remanent magnetization (Mr) of 3.64 emu/g. Additionally, these samples had a total pore volume of 0.071 cm³/g, a Specific Surface Area (SSA) of 24.13 cm²/g, and an Average Particle Size (APS) of 12.32 nm. It was concluded that the synthesis route of Ni_xMn_1-xFe₂O₄ could be theoretically summarized into two routes. One route involves the simultaneous substitution of divalent iron (Fe²⁺) and trivalent iron (Fe³⁺) in the spinel structure of (Fe)[Fe]₂O₄ by divalent manganese ions (Mn²⁺) and trivalent nickel ions (Ni³⁺), resulting in the formation of (Mn)_x(Fe)_1-x[Ni]_y[Fe]_2-yO₄ with a spinel crystal structure. In this structure, the Ni³⁺ ions preferentially occupy the octahedral sites, whereas the Mn²⁺ ions predominantly reside in the tetrahedral sites of the nickel manganese ferrites (Mn)_x(Fe)_1-x[Ni]_y[Fe]_2-yO₄. Furthermore, the mixed spinel crystal structure of (Ni)_y(Fe)_1-y[Mn]_x[Fe]_2-xO₄ could be transformed into nickel manganese ferrite (Mn)_x(Fe)_1-x[Ni]_y[Fe]_2-yO₄ under the influence of a higher oxidization roasting temperature. Nickel manganese ferrite Ni_xMn_1-xFe₂O₄ (0 &lt; x &lt; 1) with normal and inverse spinel structures inevitably coexists and co-transformed in the synthesis process of Ni_xMn_1-xFe₂O₄ by oxidation roasting technology.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104951"},"PeriodicalIF":4.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178589","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":"Effect of liquid nitrogen cold soaking on the pore structure and fractal characteristics during in situ leaching of sandstone uranium ores","authors":"Leiming Wang ,&nbsp;Liang Cheng ,&nbsp;Shenghua Yin ,&nbsp;Wei Chen ,&nbsp;Shuo Li ,&nbsp;Chao Zhang ,&nbsp;Senmiao Xue ,&nbsp;Jian Yang ,&nbsp;Yun Zhou ,&nbsp;Jinglin Xu ,&nbsp;Lujing Zheng ,&nbsp;Cunbao Li ,&nbsp;Yafei Hu","doi":"10.1016/j.apt.2025.104943","DOIUrl":"10.1016/j.apt.2025.104943","url":null,"abstract":"<div><div>In this study, a green and efficient liquid nitrogen fracturing method was explored. Sandstone uranium ore was first treated with liquid nitrogen cold soaking, followed by an analysis of the evolution of its pore and fracture structure using Low temperature nitrogen adsorption(LTNA), Nuclear magnetic resonance (NMR), and Scanning electron microscopy (SEM). The fractal characteristics of the pore structure and its evolution mechanism were also examined.The results show that gas adsorption in the ore increased with longer cold soaking times and more cycles.The highest nitrogen adsorption capacity was observed at a soaking time of 180 min, reaching 15.8556 cm³/g. Additionally, after 15 freezing cycles, the nitrogen adsorption capacity reached 14.8818 cm³/g. The proportion of micropores decreased, while mesopores and macropores increased. Specifically, after 180 min of liquid nitrogen soaking, micropores decreased by 9.59 %, mesopores increased by 7.79 %, and macropores increased by 1.8 %. After 15 cycles, micropores decreased by 10.55 %, mesopores increased by 6.38 %, and macropores increased by 4.17 %. SEM observations confirmed that the liquid nitrogen treatment expanded existing pores and cracks, and generated new fractures.Fractal dimension analysis revealed that liquid nitrogen treatment reduced the fractal dimension of the ore.This study effectively improves permeability and promotes uranium leaching in sandstone ores.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104943"},"PeriodicalIF":4.2,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170409","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":"Alkaline-earth metal-doped In2O3 microtubes: a simple and efficient approach for detection of ppb-level formaldehyde gas","authors":"Wenjing Wu ,&nbsp;Jing Li ,&nbsp;Bo Hong ,&nbsp;Jingcai Xu ,&nbsp;Xiaoling Peng ,&nbsp;Hongwei Chen ,&nbsp;Shi Qiu ,&nbsp;Nan Zhang ,&nbsp;Xinqing Wang","doi":"10.1016/j.apt.2025.104948","DOIUrl":"10.1016/j.apt.2025.104948","url":null,"abstract":"<div><div>Metal doping has been widely acknowledged as a<!--> <!-->facile yet impactful approach to optimize the gas-sensing performance of metal oxide semiconductors. In this study, stable-valence alkaline-earth metals <strong>(</strong>Ca, Sr, and Ba) are incorporated into In₂O₃ microtubes to investigate the influence of ionic radius on formaldehyde gas-sensing performance. The results indicate that heterogeneous doping leads to a reduction in average grain size and bandgap, while concurrently increasing the specific surface area and the concentration of oxygen vacancies. The formaldehyde response values increase from 36.18 for In₂O₃ sensor, to 95.66 for In₂O₃-Ca sensor, to 107.93 for In₂O₃-Sr sensor, and up to 154.32 for In₂O₃-Ba sensor, correlating with the ionic radius of the doped-metals. The In₂O₃-Ba sensor notably demonstrates excellent selectivity toward formaldehyde, long-term stability, and a reduced operating temperature of 190 °C. The increase in ionic radius is associated with greater lattice distortion in the In₂O₃-Ba microtubes, a reduction in average grain size, and an elevated concentration of oxygen vacancies. Larger radius metal-doping significantly elevates oxygen vacancy density and chemisorbed oxygen content. Density functional theory calculations reveal that the adsorption energy for formaldehyde molecules on the In₂O₃-Ba sensor is the lowest at −1.75 eV. The enhanced vacancy and chemisorbed oxygen from acceptor Ba³⁺-doping into the n-type In₂O₃-Ba sensor facilitate the excellent gas-sensing performance, highlighting the contribution of the large-radius acceptor-doping to the high-performance In₂O₃ gas sensor.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104948"},"PeriodicalIF":4.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170492","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":"Comparative CFD study on regional drug deposition of Breezhaler® and Handihaler® in the human respiratory tract","authors":"Lixing Zhang ,&nbsp;Gang Guo ,&nbsp;Zhenbo Tong ,&nbsp;Ya Zhang ,&nbsp;Aibing Yu ,&nbsp;Changhui Li","doi":"10.1016/j.apt.2025.104935","DOIUrl":"10.1016/j.apt.2025.104935","url":null,"abstract":"<div><div>Inhalation therapy has become a cornerstone in the management of chronic respiratory diseases such as chronic obstructive pulmonary disease (COPD) and asthma. Among various devices, Breezhaler® and Handihaler® are two widely used dry powder inhalers (DPIs) in clinical practice. However, due to differences in structural design and aerodynamic characteristics, these devices exhibit markedly different drug deposition patterns within the respiratory tract. Currently, there is a lack of comprehensive comparative studies investigating their deposition efficiency and underlying mechanisms across distinct regions of the airway. To address this gap, the present study employs CFD-DPM approach to evaluate and compare the deposition and distribution behavior of Breezhaler® and Handihaler® in the MT, TB, and deep lung regions under five pressure drop levels and four particle size conditions. The results indicate that Breezhaler® features a more streamlined internal structure, allowing the airflow to maintain higher and more uniform velocities. In contrast, Handihaler® generates lower overall airflow speeds and exhibits greater velocity gradients and localized turbulence within the oral cavity. For both devices, oral deposition rates increase with rising pressure drops and particle sizes, with Handihaler® consistently showing higher oral deposition, particularly under elevated flow and particle size conditions. In the TB region, Breezhaler® demonstrates superior deposition efficiency compared to Handihaler®. Enhancing TB deposition with Breezhaler® can be achieved by utilizing smaller particle sizes, while Handihaler® can improve TB deposition efficiency even with larger particles by operating under lower pressure drops. Furthermore, Handihaler® shows better performance in drug delivery to the deep lung region.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104935"},"PeriodicalIF":4.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154507","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":"Mechanism of a new combined collector for efficient flotation separation of cassiterite and calcite","authors":"Yonghong Xu ,&nbsp;Lingyun Huang ,&nbsp;Mei Zhang ,&nbsp;Jianhan Zhou ,&nbsp;Bo Hu ,&nbsp;Louyan Shen ,&nbsp;Jian Liu ,&nbsp;Dandan Wu ,&nbsp;Siyuan Yang","doi":"10.1016/j.apt.2025.104942","DOIUrl":"10.1016/j.apt.2025.104942","url":null,"abstract":"<div><div>The challenging separation of cassiterite from calcite by flotation stems from their similar floatability, requiring innovative combined collectors to improve process efficiency and selectivity. Here, a novel PTPA/FeCl₃ collector was developed by synthesizing p-<em>tert</em>-butylphenylhydroxamic acid (PTPA) with FeCl₃. Microflotation tests showed that using PTPA alone yielded 81.80% SnO₂ and 45.87% CaO recoveries, whereas PTPA/FeCl₃ increased SnO₂ recovery to 89.51% while reducing CaO to 27.02%, demonstrating superior separation efficiency. Contact angle measurements confirmed enhanced cassiterite hydrophobicity from the mixed collector. SEM-EDS and XPS analyses revealed effective chemisorption of PTPA/FeCl₃ on cassiterite, where PTPA and FeCl₃ formed a stably adsorbed chelate complex. In contrast, calcite exhibited weak and unstable adsorption. The mixed collector thus combines strong collecting capability with high selectivity for cassiterite over calcite.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104942"},"PeriodicalIF":4.2,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154506","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":"Effects of curing temperatures and waste marble aggregates on the properties of geopolymer mortars produced with industrial by-products and waste baked clay powders","authors":"Cenk Karakurt,&nbsp;Ahmet Ferdi Şenol,&nbsp;Nazım Çağatay Demiral","doi":"10.1016/j.apt.2025.104946","DOIUrl":"10.1016/j.apt.2025.104946","url":null,"abstract":"<div><div>This study explores the physical, mechanical, and microstructural properties of geopolymer mortars produced from various waste materials, including fly ash (F), blast furnace slag (S), waste baked clay (WBC), and waste marble. A two-phase process was employed to develop mortars meeting specific performance targets. In the first phase, geopolymer mixes were prepared using powdered precursors derived from industrial by-products and WBC. In the second phase, the effect of replacing river sand with waste marble aggregate at varying levels (25 %, 50 %, and 75 % by weight) was investigated, focusing on mixtures demonstrating superior mechanical strength. Results showed that F-based mortars achieved a maximum compressive strength of 38.2 MPa when cured at 80 °C, while S-based mortars reached 48.5 MPa at 60 °C. The mechanical performance of WBC-based mortars improved with 50 % substitution of F or S. Additionally, incorporating up to 25 % waste marble aggregate in F- or S-based mortars enhanced their strength. This research supports the development of sustainable construction materials by promoting the reuse of WBC, industrial by-products, and waste marble. The proposed method presents a feasible pathway to reduce natural resource consumption and carbon emissions associated with conventional mortar production.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104946"},"PeriodicalIF":4.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154508","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":"Design and numerical simulation of a novel vortex structure for copper slag melting reduction process","authors":"Xiang Li,&nbsp;Yan Liu,&nbsp;Tingan Zhang,&nbsp;Yadong Xiao,&nbsp;Kun Wang","doi":"10.1016/j.apt.2025.104944","DOIUrl":"10.1016/j.apt.2025.104944","url":null,"abstract":"<div><div>A new type of vortex entrainment feeder structure has been established to address the problem of powder suspension and the inability to be quickly sucked up by the melt pool in the current mechanical stirring melting reduction tank. Numerical simulations of the particle motion behaviour and fluid flow characteristics of the four feeders have been carried out to determine the justification of the structural design. An experimentally verified numerical approach was established using the Eulerian model coupled with the Dense Discrete Phase Model (DDPM). The results show that the Type-4 (Double-flow channel) creates vortexes with significant effect, the shape of the entrainment vortex is uniform, and the velocity is high, the radial and axial particle concentration is 1.75 times and 1.44 times higher than that of the Type-1 (No-flow channel), and the particles are dispersed optimally, with a more extended residence mixing time. The mass flow variance of the particles was reduced by 55 % compared to the Type-1, the number of high-velocity particles was &gt; 92 %, and the eccentricity distance of the positional distribution was shortened. The main driving forces for radial and axial particle dispersion are negative pressure entrainment of the gas phase and axial velocity difference. The variance values of the swirling number in the cylinder/cone zone were reduced by 91.3 % and 38.5 %, respectively, and the stability of the swirl flow field was improved.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104944"},"PeriodicalIF":4.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154509","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":"Modulation of demagnetization field and DC bias performance of carbonyl iron molded inductors by mixing submicron FeSi particles","authors":"Yong Zhang ,&nbsp;Junzhou Wang ,&nbsp;Xinyan Huang ,&nbsp;Sizhe He ,&nbsp;Panjie Shao ,&nbsp;Aimin Wu ,&nbsp;Xuefeng Zhang ,&nbsp;Zhaohui Yang ,&nbsp;Zhongli Jiang ,&nbsp;Dongmei Feng ,&nbsp;Hao Huang","doi":"10.1016/j.apt.2025.104939","DOIUrl":"10.1016/j.apt.2025.104939","url":null,"abstract":"<div><div>In the modern era of advanced electronic equipment, the capacity of electronic components to function effectively in high-current environments, i.e. DC bias performance, has become a subject of increasing interest. The use of magnetic powder composite technology has been shown to enhance the DC bias performance of electronic components. In this paper, the submicron spherical FeSi powders, which were prepared by DC arc plasma method, mixed with micron-sized carbonyl iron powders (CIPs) to prepare CIP/FeSi soft magnetic composites (SMCs) and molded inductors. It is shown that the mixing of FeSi powders inevitably reduces the permeability of the SMCs, but provides modulatable DC bias performance. The study found that the SMCs’ magnetic permeability was 32.46, which is a 8.7% decrease. The saturation current was 2.86 A, which is a 28.8% increase, and the DC bias performance was significantly improved. In this paper, the mechanism of the mixed FeSi magnetic powder to improve the DC bias performance of SMCs is elucidated by combining the periodic modeling of mixed magnetic powders and the analysis of FeSi powder structure and properties. This study provides a theoretical basis for the composition and structure design of soft magnetic composites, and the prepared SMCs can be used in high-current operating environments, which have a good application prospect.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104939"},"PeriodicalIF":4.2,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123379","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":"Silica-coated NiPt core-shell nanoparticles stable to Ni Oxidation and aggregation","authors":"Masato Yanase ,&nbsp;Yoshiki Ueno ,&nbsp;Noriko Yamauchi ,&nbsp;Shohei Tada ,&nbsp;Daisuke Nagao ,&nbsp;Yoshio Kobayashi","doi":"10.1016/j.apt.2025.104934","DOIUrl":"10.1016/j.apt.2025.104934","url":null,"abstract":"<div><div>Magnetic particles with a size of dozens of nanometers or less have excellent operability under external magnetic fields and are required to be chemically stable and resistant to aggregation. Owing to their excellent properties, magnetic fine particles have applications in medical imaging, hyperthermia treatment, solid-phase extraction, and recording media. However, pure metal nanoparticles aggregate or oxidize, necessitating the development of a simple method to suppress these phenomena. In this study, NiPt and SiO₂-coated NiPt (NiPt/SiO₂) nanoparticles were fabricated and characterized. Metallic Ni nanoparticles were synthesized in water exposed to air using Ni(II) acetate tetrahydrate, hexachloroplatinate(IV) hexahydrate, hydrazine, and poly(sodium 4-styrenesulfonate) as the Ni and Pt sources, reducing reagent, and stabilizer, respectively. The simultaneous reduction of Ni and Pt cations afforded NiPt nanoparticles. The NiPt nanoparticles (9.7 ± 3.3 nm) were significantly smaller than the Ni particles synthesized using hydrazine as a reducing reagent (∼300–600 nm). The Pt nuclei were generated faster than the Ni nuclei because of the difference in their standard electrode potentials. The NiPt/SiO₂ nanoparticles were synthesized by adding a tetraethylorthosilicate/(3-aminopropyl)triethoxysilane/ethanol solution to the NiPt nanoparticle colloidal solution. They did not aggregate during 24 h of the silica-coating process, whereas the uncoated NiPt nanoparticles were ionized and significantly aggregated over the reaction time of 24 h. The saturation magnetization values of the uncoated NiPt and NiPt/SiO₂ nanoparticles were 28.0 and 56.9 emu/g-Ni, respectively, which indicated that the silica coating prevented particle aggregation and controlled Ni oxidation on the surface of the metallic NiPt nanoparticles during the synthesis process. The present work contributes to the advancement of methods for synthesizing colloidally stable metal nanoparticles and synthesis environments.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 7","pages":"Article 104934"},"PeriodicalIF":4.2,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123381","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}