Advanced Powder Technology最新文献_第6页

Multi-physical field coupling analysis of the spontaneous combustion process in coal gangue hills influenced by slope profiles 受坡度影响的煤矸石山自燃过程多物理场耦合分析

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-11 DOI: 10.1016/j.apt.2025.105111

Peng Wang , Shaochen Yang , Wencai Wang , Zhao Cao , Xuping Li , Yongdan Cao , Zhoukang Wu , Dawei Wang

Understanding the effects of different slope profiles on the spontaneous combustion of coal gangue hills is crucial for effective prevention and control. Unlike previous studies that primarily focused on temperature variations, this study developed a multiphysics coupling model integrating seepage velocity, oxygen concentration, and temperature fields to investigate the internal evolution of multiple fields during the spontaneous combustion process. Based on thermodynamic experiments, a zoning method was proposed using characteristic temperature points to delineate spontaneous combustion risk zones within coal gangue hills. The spatial distribution and formation mechanisms of combustion-prone areas were analyzed across hills with different slope profiles. The results show that when the coal gangue temperature reaches the T₂ point (336.82 °C), the material enters an accelerated oxidation stage, significantly increasing the risk of spontaneous combustion. Multiphysics simulation revealed that high-risk zones are primarily located in the mid-upper slope areas, with risk severity ranked as follows: arc-shaped > planar > corner > arched slopes. Additionally, under oblique wind conditions, the overall combustion risk for all slope types was reduced. The study found that the spontaneous combustion risk of coal gangue hills increases with stacking time at a decelerating rate, while the minimum safe accumulation rate exhibits exponential growth as stacking duration extends.

了解不同坡度对煤矸石山自燃的影响，对有效防治煤矸石山自燃具有重要意义。与以往主要关注温度变化的研究不同，本研究建立了一个综合渗流速度、氧浓度和温度场的多物理场耦合模型，以研究自燃过程中多场的内部演化。在热力学实验的基础上，提出了利用特征温度点划分煤矸石山自燃危险区的方法。分析了不同坡度丘陵易燃区的空间分布及其形成机制。结果表明：当煤矸石温度达到T2点（336.82℃）时，物料进入加速氧化阶段，自燃风险显著增加；多物理场模拟结果显示，高发区主要位于中上坡区，高发区风险等级依次为：弧形边坡；平面边坡；转角边坡；此外，在斜风条件下，所有坡度类型的总体燃烧风险都降低了。研究发现，煤矸石丘自燃风险随堆垛时间的增加呈减速增长趋势，最小安全堆积率随堆垛时间的延长呈指数增长趋势。

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引用次数: 0

Pyrocarbon coatings of nanometer and submicron thickness on coarse diamond and silicon carbide powders differing in particle shape 在颗粒形状不同的粗金刚石和碳化硅粉末上制备纳米和亚微米厚度的焦碳涂层

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-10 DOI: 10.1016/j.apt.2025.105099

Andrey M. Abyzov , Fedor M. Shakhov , Maria V. Tomkovich , Maxim M. Sychev

Pyrocarbon coatings were applied to coarse-grained (particle size of about 250 μm) diamond and silicon carbide powders by chemical vapor deposition (CVD). The substrate particles were smooth-faced and isometric for diamond, whereas for silicon carbide they were elongated and had irregular shape. According to scanning electron microscopy (SEM) and Raman spectroscopy, the coatings obtained are typical of pyrocarbon. The BET specific adsorption surface area s^a_m and the electrical resistance R of the powders in the packed bed were measured, as well as the coating density ρ_c. All the obtained data on the coating properties and structure are presented as dependences on the mass-average coating thickness h calculated from the coating mass and the specific geometric surface area s^g_m of the substrate powder. The s^g_m value was determined using the average particle size and the shape coefficient (sphericity). This made it possible to identify the differences between nanometer and submicron coatings (h ≤ 0.1 μm or h > 0.1 μm) and to relate the observed features of the ρ_c(h), s^a_m (h), and R⁻¹(h) dependences to the coating microstructure (roughness, continuity, etc.). The diagrams h(τ), where τ is the deposition time, enabled us to compare the pyrocarbon growth rate on diamond and on silicon carbide.

采用化学气相沉积（CVD）技术对粗粒度（粒径约250 μm）金刚石和碳化硅粉末进行了热炭涂层处理。金刚石衬底颗粒表面光滑且等距，而碳化硅衬底颗粒呈细长状且形状不规则。通过扫描电镜（SEM）和拉曼光谱（Raman spectroscopy）分析，得到的涂层是典型的热解碳涂层。测定了填料床中粉末的BET比吸附表面积sam和电阻R，以及涂层密度ρc。所有得到的关于涂层性能和结构的数据都依赖于由涂层质量计算得到的质量平均涂层厚度h和基材粉末的比几何表面积sgm。sgm值由平均粒径和形状系数（球度）确定。这使得可以识别纳米和亚微米涂层（h ≤ 0.1 μm或h >； 0.1 μm）之间的差异，并将所观察到的ρc(h), sam (h)和R−1(h)的依赖特征与涂层微观结构（粗糙度，连续性等）联系起来。图h(τ)，其中τ是沉积时间，使我们能够比较金刚石和碳化硅上的热碳生长速率。

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引用次数: 0

Highly accurate prediction of mini-hydrocyclone separation efficiency by coupling back propagation neural network and response surface method 基于反向传播神经网络和响应面耦合的小型水力旋流器分离效率高精度预测

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-08 DOI: 10.1016/j.apt.2025.105100

Yahong Wang , Lixin Zhao , Lin Liu , Dianyu E , Kaiwen Yang , Shuang Zhang , Muze Wang

Mini-hydrocyclones (MHCs) are widely used for efficient fine particle separation. However, their separation efficiency can fluctuate significantly with changes in their geometry, operating conditions, or the separated medium. Current evaluation methods rely heavily on numerical simulations and experiments, which increases complexity and costs, limiting their practical use. This study developed a back-propagation neural network (BPNN) model integrating MHC geometrical parameters, operational parameters, and media physical properties to predict separation efficiency. Combined with response surface methodology (RSM), the optimal BPNN configuration was determined: 13 and 11 neurons in the first and second hidden layers, respectively, with a learning rate of 5.27E-3. The number of neurons in the first hidden layer was found to have the most significant effect on the model accuracy, followed by the learning rate. The optimized model’s mean square errors (MSEs) on the training and testing datasets are only 7.11E-4 and 8.98E-4, which are significantly lower than those in the original BPNN model. And the model was validated using new experimental data from other literature, demonstrating its high generalization ability to new data. Further, the superiority of the optimized BPNN model was verified by comparing the accuracy of existing prediction models. This study can provide a high-precision prediction method for the multiphase separation of MHCs under different operating conditions, which can help to improve the application efficiency of MHCs.

微型旋流分离器（MHCs）广泛用于细颗粒的高效分离。然而，它们的分离效率会随着它们的几何形状、操作条件或分离介质的变化而显著波动。目前的评估方法严重依赖于数值模拟和实验，这增加了复杂性和成本，限制了它们的实际应用。本研究建立了一种结合MHC几何参数、操作参数和介质物理性质的反向传播神经网络（BPNN）模型来预测分离效率。结合响应面法（RSM），确定了BPNN的最优配置：第一隐层和第二隐层分别有13和11个神经元，学习率为5.27E-3。发现第一隐层神经元数量对模型精度的影响最为显著，其次是学习率。优化后的BPNN模型在训练集和测试集上的均方误差（mse）仅为7.11E-4和8.98E-4，显著低于原BPNN模型。并利用其他文献的新实验数据对模型进行了验证，证明了该模型对新数据具有较高的泛化能力。进一步，通过对比现有预测模型的精度，验证了优化后的bp神经网络模型的优越性。本研究可为不同操作条件下mhc的多相分离提供一种高精度的预测方法，有助于提高mhc的应用效率。

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引用次数: 0

Experimental investigation of the hydrodynamics of chip-like particles in a flat-base spouted bed 平板喷流床中片状颗粒流体力学的实验研究

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-07 DOI: 10.1016/j.apt.2025.105080

Zhan Luo, Xinxin Tang, Zhouzun Xie, Yansong Shen

Despite the broad applications in the chemical engineering fields, the spouting behavior of chip-like particles in the spouted beds is still limited from the experimental scope. In the current study, the minimum spouting velocity, spout instability including spout incoherence and spout deflection, and particle mixing are investigated based on the Particle Image Velocimetry (PIV) measurement. Two kinds of particles (chip-like and spherical) are adopted in this work and the effect of spouting gas velocity and static bed height on the spouting behavior is discussed. The spout incoherence and spout deflection are post-processed with two simple quantitative methods, respectively. The results show that the minimum spouting velocity both for spherical and chip-like particles increases with the increase of the static bed height. The particle velocity distribution (x- or y-direction) is affected significantly by the particle shape, gas spouting velocity and static bed height. For spout incoherence, the blockage height almost linearly increases in a period for both spherical and chip-like particles under different case settings. Finally, three main mixing zones are classified in the dense bottom region, spouting mixing zone, downward movement mixing zone and unmixing/dead zones. The current work is beneficial to the further investigation of chip-like particles in the spouted beds.

尽管片状颗粒在化学工程领域有着广泛的应用，但从实验范围来看，片状颗粒在喷床中的喷射行为仍然是有限的。本文研究了基于粒子图像测速技术（PIV）的最小喷射速度、喷射不稳定性（包括喷射不相干性和射流偏转）以及粒子混合。采用两种颗粒（片状和球形），讨论了喷射气速和静床高度对喷射行为的影响。用两种简单的定量方法分别对喷口不相干和喷口偏转进行了后处理。结果表明：随着静床高度的增加，球形颗粒和片状颗粒的最小喷射速度均增大；颗粒形状、气体喷射速度和静态床层高度对颗粒速度分布（x方向或y方向）有显著影响。对于喷口非相干性，在不同情况下，球形和片状颗粒的堵塞高度在一段时间内几乎呈线性增加。最后将混合区划分为密底区、喷淋混合区、向下运动混合区和解混/死区。本文的工作对进一步研究喷流层中的片状颗粒具有一定的指导意义。

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引用次数: 0

Composite fiber of polyvinyl alcohol/activated carbon from corn cob prepared by electrospinning as a sustainable adsorbent for efficient rhodamine B adsorption 静电纺丝法制备聚乙烯醇/玉米芯活性炭复合纤维，作为高效吸附罗丹明B的可持续吸附剂

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-07 DOI: 10.1016/j.apt.2025.105093

Adhi Setiawan, Sugeng Winardi, W. Widiyastuti

Rhodamine B (RB) is a synthetic dye commonly used in the textile industry, but its presence poses risks to health and the environment. Mitigating water pollution caused by synthetic dyes necessitates effective wastewater treatment methods. Therefore, this study aims to develop a simple, cost-effective, and environmentally friendly approach to synthesizing adsorbents by combining polyvinyl alcohol (PVA) and corn cob (CC)-based activated carbon (AC) through an electrospinning process to form PVA/AC composite fibers. The results showed that the increase in AC content in the composite fiber led to an enhancement in the adsorption performance against RB. PVA/AC composite fiber containing 10 % AC had a maximum adsorption capacity 5.41 times higher than PVA fiber and got a maximum 96.02 % RB removal efficiency. Adsorption isotherm analysis demonstrated compliance with the Langmuir model. Kinetic studies show that the pseudo-first-order (PFO) model best explains the adsorption process. Thermodynamic analysis also indicated that the adsorption was spontaneous and exothermic (ΔH° = −57.23 kJ/mol). Based on reusability tests, the adsorbent maintained a high removal efficiency, with RB removal decreasing marginally from 96.35 % to 78.93 % after five cycles. These results underscore the potential of PVA/AC composite fiber as an effective adsorbent for addressing water pollution caused by synthetic dyes.

罗丹明B （RB）是一种合成染料，通常用于纺织工业，但它的存在对健康和环境构成风险。减轻合成染料造成的水污染需要有效的废水处理方法。因此，本研究旨在开发一种简单、经济、环保的方法，将聚乙烯醇（PVA）和玉米芯（CC）基活性炭（AC）通过静电纺丝工艺合成PVA/AC复合纤维。结果表明，复合纤维中AC含量的增加导致复合纤维对RB的吸附性能增强。含10% AC的PVA/AC复合纤维的最大吸附量是PVA纤维的5.41倍，对RB的最大去除率为96.02%。吸附等温线分析表明符合Langmuir模型。动力学研究表明，伪一阶（PFO）模型最能解释吸附过程。热力学分析表明，吸附是自发的、放热的（ΔH°=−57.23 kJ/mol）。重复使用试验表明，该吸附剂保持了较高的去除效率，循环5次后，RB的去除率从96.35%略微下降至78.93%。这些结果强调了聚乙烯醇/AC复合纤维作为一种有效的吸附剂处理合成染料引起的水污染的潜力。

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引用次数: 0

CFD-DEM modeling and simulation of ellipsoidal particles in a gas–solid spouted bed 气固喷流床中椭球颗粒的CFD-DEM建模与仿真

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-04 DOI: 10.1016/j.apt.2025.105095

Ling Zhou , Haihan Yu , Zhenjiang Zhao , Daramy Kallon , Ramesh Agarwal , Jie Chen

Gas-solid spouted beds are widely used in fields such as biomass combustion due to their excellent heat transfer performance and gas–solid mixing efficiency. The size, shape, and density of biomass particles play a crucial role in the two-phase flow and combustion kinetics processes. However, existing research has primarily focused on spherical biomass particles, and the fluidization mechanisms of non-spherical particle systems has not yet been fully understood. Therefore, studying the fluidization characteristics of non-spherical particle systems is of great significance for advancing fluidization theory and optimizing the design of spouted bed reactors. This study employs the computational fluid dynamics (CFD) and discrete element method (DEM) framework to investigate the fluidization characteristics of ellipsoidal particles and validates the reliability of the numerical model through high-speed photography experiments. The results indicate that as the inlet gas velocity increases, the average bed height and void fraction of ellipsoidal particles in the spouted bed gradually increase, and the particle mixing quality is enhanced. As the initial accumulation height increases, the average bed height and volume fraction of ellipsoidal particles gradually increase, while the overall particle mixing quality decreases. Particles with orientation angles between 30° and 45°constitute a smaller proportion, whereas those with orientation angles between 75° and 90° constitute a larger proportion.

气固喷淋床以其优异的传热性能和气固混合效率在生物质燃烧等领域得到了广泛的应用。生物质颗粒的大小、形状和密度在两相流动和燃烧动力学过程中起着至关重要的作用。然而，现有的研究主要集中在球形生物质颗粒上，非球形颗粒系统的流化机制尚未完全了解。因此，研究非球形颗粒系统的流态化特性，对于推进流态化理论和优化喷淋床反应器设计具有重要意义。本研究采用计算流体力学（CFD）和离散元法（DEM）框架研究椭球颗粒流态化特性，并通过高速摄影实验验证数值模型的可靠性。结果表明：随着进口气速的增大，喷淋床层平均高度和椭球状颗粒的空隙率逐渐增大，颗粒混合质量增强；随着初始堆积高度的增加，椭球状颗粒的平均床层高度和体积分数逐渐增大，而整体颗粒混合质量下降。取向角在30°~ 45°之间的粒子所占比例较小，取向角在75°~ 90°之间的粒子所占比例较大。

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引用次数: 0

Effect of meso/micro multiple scale turbulent shear mixing on the synthesis process of micro/nano oxide particles in continuous multistage Rankine vortex flow 中/微多尺度湍流剪切混合对连续多级朗肯涡流中微/纳米氧化物颗粒合成过程的影响

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-04 DOI: 10.1016/j.apt.2025.105094

Yanqing Guo , Jiaying Lu , Luming Chen , Jie Yang , Xiaogang Yang , Yihang Xin

An Eulerian Computational Fluid Dynamics modelling coupled with the use of Lagrangian Discrete Phase Model (CFD/DPM) was employed to investigate the effect of meso/micro multiple-scale turbulent mixing on the synthesis process of micro/nano oxide particles in a continuous multistage Rankine vortex flow. The changes from micro- to macro-scale interactions among different scales, including the coupling of particle entrainment by turbulent eddies and synthesis reaction in the Rankine vortex flow and the mesoscale structure (i.e., particle aggregates and reactor scales) were systematically studied, especially focusing on the influence of meso/micro scale turbulent eddies on the synthesized micro/nano particles. It has been demonstrated that the use of Eulerian-Lagrangian framework (CFD/DPM) can effectively capture the simultaneous interactions between aggregated particles and turbulent eddies, enabling the evaluation of how operational variations, specifically in the eddy size based Reynolds number and reactant concentration, to affect the final particle properties. Numerical results for a range of these conditions have shown a strong agreement with the experimental data. The present study has demonstrated that the multistage Rankine vortex flow can effectively intensify the local turbulence induced shear at meso/micro scales, thereby controlling nanoparticle aggregation and breakage to facilitate the production of uniform, meso-sized particles with well-defined morphology.

采用欧拉计算流体力学模型和拉格朗日离散相模型（CFD/DPM），研究了连续多级朗肯涡流中中观/微观多尺度湍流混合对微/纳米氧化物颗粒合成过程的影响。系统研究了不同尺度间相互作用从微观到宏观的变化，包括Rankine涡旋中湍流涡旋夹带粒子与合成反应的耦合以及中尺度结构（即粒子聚集体和反应器尺度），重点研究了中/微尺度湍流涡旋对合成微/纳米粒子的影响。已经证明，使用欧拉-拉格朗日框架（CFD/DPM）可以有效地捕获聚集颗粒与湍流涡流之间的同时相互作用，从而能够评估操作变化，特别是基于雷诺数和反应物浓度的涡流大小，如何影响最终颗粒性质。这些条件的数值结果与实验数据非常吻合。本研究表明，多级朗肯涡旋流动可以有效地增强局部湍流引起的中观/微观尺度剪切，从而控制纳米颗粒的聚集和断裂，从而促进均匀的、具有明确形态的中观尺寸颗粒的产生。

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引用次数: 0

Evaluation of the use of silica extracted from industrial waste with an ultrasonic bath and modifications to the aging stage in the synthesis of ZSM-5 and its application in pyrolysis 评价超声波浴法提取工业废渣中二氧化硅在ZSM-5合成及热解中的应用

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-03 DOI: 10.1016/j.apt.2025.105098

Camila Ottonelli Calgaro , Mirian Dosolina Fuzinatto , Shayla Santos Lopes , Taliana Tronco , Diego Gil de los Santos , Daniel Assumpção Bertuol , Pedro José Sanches Filho

Rice husk ash is an industrial residue composed essentially of silica that can be used as an alternative source of silica for the synthesis of ZSM-5 zeolite. This study aimed to obtain ZSM-5 zeolite without organic structure-directing agents, evaluating the use of silica extracted from industrial rice husks using an ultrasonic bath. The effect of ultrasound was also evaluated in the aging stage of the zeolite. The catalytic potential of the synthesized zeolite was measured in the pyrolysis of rice husks. XRF, XRD, BET, and SEM-EDS characterization were performed on the synthesized zeolites. It was possible to obtain the ZSM-5 zeolite under all the synthesis conditions studied. Still, the silica extraction method and the aging method were decisive for the formation of the crystalline phase and the surface area of the synthesized zeolite. The use of silica extracted with an ultrasonic bath promoted the most crystalline ZSM-5 phase in the samples and the highest surface areas. The ZU3 zeolite had the highest BET surface area of 277.5 m²/g, which was attributed to the use of ultrasound. The application of ZU3 zeolite increased the gas phase production in rice husk pyrolysis to 45 % due to its action in cracking reactions.

稻壳灰是一种主要由二氧化硅组成的工业废渣，可以作为合成ZSM-5沸石的二氧化硅的替代来源。本研究旨在获得不含有机结构导向剂的ZSM-5沸石，并利用超声波浴对工业稻壳中提取的二氧化硅进行了评价。并对超声波在沸石老化阶段的作用进行了评价。测定了合成的沸石在稻壳热解过程中的催化电位。对合成的沸石进行了XRF、XRD、BET和SEM-EDS表征。在所研究的所有合成条件下均可得到ZSM-5分子筛。此外，二氧化硅萃取法和时效法对合成沸石的晶相形成和表面积有决定性的影响。使用超声浴提取的二氧化硅促进了样品中最结晶的ZSM-5相和最高的表面积。ZU3沸石的BET比表面积最高，为277.5 m2/g，这是超声作用的结果。ZU3沸石的应用使稻壳热解气相产率提高到45%，这是由于它在裂化反应中的作用。

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引用次数: 0

Measurement of interparticle forces in two-dimensional granular systems using the Virtual Fields Method and Localized Spectrum Analysis 用虚场法和局域谱分析测量二维颗粒系统中的粒子间力

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.apt.2025.105079

Kunanon Jongchansitto , Xavier Balandraud , Benoit Blaysat , Michel Grédiac , Thomas Jailin , Jean-Benoit Le Cam , Pawarut Jongchansitto , Itthichai Preechawuttipong

The paper proposes a new experimental technique to measure interparticle contact forces in two-dimensional (2D) granular media comprising opaque particles. The technique used to identify the forces is the Virtual Fields Method (VFM), which uses the weak form of the local equilibrium equation. The high-resolution strain fields required for identification are measured within the particles using Localized Spectrum Analysis (LSA), based on a checkerboard marking previously engraved on each particle. Applications are performed on systems composed of one hundred cylindrical particles in polyamide 66 (PA66) under quasi-static confined compression. The paper first describes the methodology to properly identify the contact forces. Next, the focus is on the statistical distributions of normal and tangential forces in monodisperse, bidisperse and tridisperse systems. Weak and strong force networks in bidisperse and tridisperse systems follow power law and exponential decay, respectively. The maximum tangential-to-normal force ratio approximates the coefficient of friction, with few exceptions. Contact force redistributions during macroscopic displacement are highlighted in tridisperse system, revealing rapid changes in forces exerted on the vertical walls. Based on various validations, including comparisons with discrete element method simulations, the study demonstrates the feasibility of VFM and LSA for measuring interparticle contact forces in 2D granular systems.

本文提出了一种新的实验技术来测量由不透明颗粒组成的二维颗粒介质中的颗粒间接触力。用于识别力的技术是虚场法（VFM），它使用局部平衡方程的弱形式。识别所需的高分辨率应变场是使用局部光谱分析（LSA）在颗粒内测量的，基于之前刻在每个颗粒上的棋盘标记。应用于聚酰胺66 （PA66）在准静态约束压缩下由100个圆柱形颗粒组成的系统。本文首先介绍了正确识别接触力的方法。接下来，重点是在单分散，双分散和三分散系统的法向和切向力的统计分布。双分散和三分散系统中的弱和强力网络分别遵循幂律和指数衰减。切向力与法向力的最大比值近似于摩擦系数，几乎没有例外。在三分散系统中，宏观位移过程中的接触力重分布是突出的，揭示了施加在垂直壁上的力的快速变化。基于各种验证，包括与离散元法模拟的比较，研究证明了VFM和LSA用于测量二维颗粒系统中颗粒间接触力的可行性。

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引用次数: 0

Aerosol-assisted synthesis of Ag-TiO2 and Cu-TiO2 hybrid nanoparticle clusters for Photon-induced antibacterial applications 气溶胶辅助合成用于光子诱导抗菌的Ag-TiO2和Cu-TiO2杂化纳米颗粒团簇

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-11-01 DOI: 10.1016/j.apt.2025.105083

Thi Quynh Nhu Le , Zhi Xuan Law , Vuong Quynh Giao Vo , Tien Khoa Le , Szu-Han Chen , Wan-Ying Chou , Wen-Ching Sun , Shih-Yuan Lu , Yu-Chen Hu , De-Hao Tsai

Titania-based hybrid nanostructures with homogenous distribution of TiO₂ and metal (Ag or Cu) nanoparticles were fabricated using an aerosol-assisted synthetic method for antibacterial applications. E. coli was chosen as the representative bacteria, and the performance was determined based on the inhibition zone diameter (ZOI) in the disk diffusion over different light irradiation, catalyst loading, and composition of catalyst material. Results show that TiO₂ nanoparticle cluster was inactive in the absence of UV light irradiation, and a significant inhibition zone was identified under UV–vis irradiation (ZOI = 9.4 mm). Addition of Ag and Cu nanoparticles improved the antibacterial activity of the TiO₂-based nanoparticle cluster, and the performance was further enhanced with the increase of catalyst loading. Clear inhibition zone was observed in the dark by using Ag/TiO₂ (ZOI = 9.0 mm), and the zone diameter was increased by having UV–vis light irradiation (ZOI = 13.3 mm), confirming metallic nanoparticle in the structure to promote antibacterial activity from the prospects of both photocatalysis and metal ion release. Ag/TiO₂ was more active than Cu/TiO₂ (ZOI = 10.2 mm) due to the higher absorption of visible light and the higher metal surface area for metal ion-induced surface reaction. These findings highlight the successful fabrication of highly dispersed metal-TiO₂ hybrid nanoparticle clusters via gas-phase evaporation-induced self-assembly to achieve high antibacterial performance.

采用气溶胶辅助合成方法制备了具有均匀分布的TiO2和金属（Ag或Cu）纳米颗粒的钛基杂化纳米结构。选取大肠杆菌作为代表菌，根据不同光照、催化剂负载和催化剂材料组成对圆盘扩散的抑制带直径（ZOI）进行性能评价。结果表明，TiO2纳米粒子簇在无紫外光照射下无活性，在紫外-可见照射下存在明显的抑制带（ZOI = 9.4 mm）。Ag和Cu纳米颗粒的加入提高了tio2基纳米颗粒簇的抗菌活性，并且随着催化剂负载的增加，性能进一步增强。Ag/TiO2 （ZOI = 9.0 mm）在黑暗中观察到明显的抑菌带，并通过紫外-可见光照射（ZOI = 13.3 mm）使抑菌带直径增大，从光催化和金属离子释放两方面证实了结构中的金属纳米颗粒促进抑菌活性。Ag/TiO2比Cu/TiO2 （ZOI = 10.2 mm）更活跃，这是因为Ag/TiO2对可见光的吸收更高，金属离子诱导表面反应的金属表面积更大。这些发现强调了通过气相蒸发诱导自组装成功制备高度分散的金属- tio2杂化纳米颗粒团簇，以获得高抗菌性能。

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引用次数: 0