Advanced Powder Technology最新文献

英文中文

Performance evaluation of dispersibility of submicron powder by jet mill and clarification of dispersion mechanism by addition of aid

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104760

Kenji Jikihara , Yu Takahashi , Tasuku Shoji , Tomoya Tamadate , Takafumi Seto

This study investigates the challenging task of powder dispersion consisting of primary particle with nanometer size range in jet milling, with an emphasis on the impact of the pre-processing, particularly influence of the various dispersion aids addition. The primary objective was to elucidate the dispersion mechanisms involved when dispersion aids are added and how different aids affect dispersibility. The experiment included the evaluation of dispersibility in a spiral jet mill (SJM) and ejector without aids with three types of the raw material powders: SiO₂, coarse Al₂O₃, and fine Al₂O₃. The experiment revealed that the SJM exhibits aligning the particle size distribution closely with that of primary particles. Subsequently, the dispersibilities of SiO₂ powder in a SJM with adding three different aids, diethylene glycol monomethyl ether (DEGME), diethylene glycol (DEG), and water were measured. It demonstrates that DEGME was found to be more effective and stable than DEG, leading to higher dispersibility at certain concentrations. Further shape factor analysis for the pre-processed powder established the model for the aids-induced dispersion process, suggesting the formation of coarser aggregates with concavities, facilitating the detachment of particles from the edges of aggregates as the aid evaporates during the milling process. These insights offer valuable contributions to nanoparticle dispersion, a critical aspect in improving the quality of nanoparticle-layered products in various powder technology industrial applications.

{"title":"Performance evaluation of dispersibility of submicron powder by jet mill and clarification of dispersion mechanism by addition of aid","authors":"Kenji Jikihara , Yu Takahashi , Tasuku Shoji , Tomoya Tamadate , Takafumi Seto","doi":"10.1016/j.apt.2024.104760","DOIUrl":"10.1016/j.apt.2024.104760","url":null,"abstract":"<div><div>This study investigates the challenging task of powder dispersion consisting of primary particle with nanometer size range in jet milling, with an emphasis on the impact of the pre-processing, particularly influence of the various dispersion aids addition. The primary objective was to elucidate the dispersion mechanisms involved when dispersion aids are added and how different aids affect dispersibility. The experiment included the evaluation of dispersibility in a spiral jet mill (SJM) and ejector without aids with three types of the raw material powders: SiO<sub>2</sub>, coarse Al<sub>2</sub>O<sub>3</sub>, and fine Al<sub>2</sub>O<sub>3</sub>. The experiment revealed that the SJM exhibits aligning the particle size distribution closely with that of primary particles. Subsequently, the dispersibilities of SiO<sub>2</sub> powder in a SJM with adding three different aids, diethylene glycol monomethyl ether (DEGME), diethylene glycol (DEG), and water were measured. It demonstrates that DEGME was found to be more effective and stable than DEG, leading to higher dispersibility at certain concentrations. Further shape factor analysis for the pre-processed powder established the model for the aids-induced dispersion process, suggesting the formation of coarser aggregates with concavities, facilitating the detachment of particles from the edges of aggregates as the aid evaporates during the milling process. These insights offer valuable contributions to nanoparticle dispersion, a critical aspect in improving the quality of nanoparticle-layered products in various powder technology industrial applications.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104760"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102508","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

Utilization of gellan gum as a novel depressant to float specularite from chlorite

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104751

Cheng Yang , Pengpeng Zhang , Zhou Chen , Chao Wang , Xiangpeng Gao , Mingyang Li

This study delves into the exploration of gellan gum (GG) as a novel depressant to selectively separate specularite from chlorite through flotation processes. The single mineral flotation assessments unveiled that the introduction of GG notably inhibited the flotation of specularite, while exerting a comparably weaker effect on chlorite, in conjunction with dodecylamine (DDA) as the collector. GG significantly amplified the difference in floatability between specularite and chlorite in artificial mixed ore flotation. The adsorption mechanism revealed the selective adherence of GG to the surface of specularite, and that GG chemically bonded to the surface of specularite through a reaction between active groups (–COOH, –OH) in GG molecules and Fe sites on the specularite surface, forming Fe-O bonds. The application of GG emerges as a promising and effective depressant for the separation of specularite from chlorite, offering significant potential within this domain of study.

引用次数: 0

Measuring fluidization behaviors of monodisperse non-spherical particles and binary mixtures of spheres with cylinders

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104755

Yihao Wen , Haoshen Niu , Boyu Zhu , Jianjian Dai , Zihao Ma , Jia Yu , Xi Gao

Understanding the fluidization behavior of monodisperse non-spherical particles and binary mixtures containing non-spherical particles is essential for better designing and optimizing fluidized bed reactors. This study experimentally investigated the effect of particle shapes on the fluidization behavior of monodispersed particles and binary particles in a rectangular bubbling fluidized bed. The experimental measurements include the total pressure drop, sectional pressure drops, mixing, and segregation. A machine learning-aided image processing method was developed to segment different particles from the background in binary fluidization and analyze particle dynamics, such as particle height distribution and non-spherical particle orientation distribution. The experimental results show that the minimum fluidization velocity decreases with a decrease in sphericity ranging from 0.63 to 1. Higher expansion height is observed for non-spherical particles than for spherical particles. Cylindrical particles disperse the most when the orientation angles (the angle between axial and horizontal directions) are ± 75°. The Lacey mixing index of sphere and cylinder mixtures decreases with the increase of the aspect ratio of cylindrical particles ranging from 1 to 5, corresponding to well and poor mixing states. The experimental results serve as benchmark data to validate computational fluid dynamics models.

{"title":"Measuring fluidization behaviors of monodisperse non-spherical particles and binary mixtures of spheres with cylinders","authors":"Yihao Wen , Haoshen Niu , Boyu Zhu , Jianjian Dai , Zihao Ma , Jia Yu , Xi Gao","doi":"10.1016/j.apt.2024.104755","DOIUrl":"10.1016/j.apt.2024.104755","url":null,"abstract":"<div><div>Understanding the fluidization behavior of monodisperse non-spherical particles and binary mixtures containing non-spherical particles is essential for better designing and optimizing fluidized bed reactors. This study experimentally investigated the effect of particle shapes on the fluidization behavior of monodispersed particles and binary particles in a rectangular bubbling fluidized bed. The experimental measurements include the total pressure drop, sectional pressure drops, mixing, and segregation. A machine learning-aided image processing method was developed to segment different particles from the background in binary fluidization and analyze particle dynamics, such as particle height distribution and non-spherical particle orientation distribution. The experimental results show that the minimum fluidization velocity decreases with a decrease in sphericity ranging from 0.63 to 1. Higher expansion height is observed for non-spherical particles than for spherical particles. Cylindrical particles disperse the most when the orientation angles (the angle between axial and horizontal directions) are ± 75°. The Lacey mixing index of sphere and cylinder mixtures decreases with the increase of the aspect ratio of cylindrical particles ranging from 1 to 5, corresponding to well and poor mixing states. The experimental results serve as benchmark data to validate computational fluid dynamics models.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104755"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102505","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

Polymorph design of CaCO3 from stable calcite to metastable vaterite and amorphous CaCO3 via altering reaction system step by step

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104758

Jiuxin Jiang , Qinyu Li , Peiqing Yan , Shengbo Xu , Yutong Zhou , Danting Zheng

Despite the pivotal roles of amorphous calcium carbonate (ACC) and vaterite in the biomineralization process, drug delivery and biomedical engineering, their thermodynamic instability poses substantial challenges in their preparation. Although many synthesis methods for ACC and vaterite have been developed, the polymorph discrimination of CaCO₃ in different reaction system remains unclear. In the present work, the polymorph of CaCO₃ is designed by altering reaction system step by step under the same or similar parameters, i.e. liquid–liquid reaction between CaCl₂ and Na₂CO₃/K₂CO₃ in aqueous solution, ethanol–water solution, ethanol/ethylene glycol solution, liquid–solid in ethylene glycol solvent and solid–solid reaction assisted by mechanical energy. The results indicate that the partial substitution of water by ethanol in aqueous reaction system has no obvious advantage on the formation and stability of vaterite, while the whole substitution of CaCl₂ aqueous solution by CaCl₂ ethanol solution has significant advantage on vaterite formation and its stability. Furthermore, the reaction between CaCl₂ and K₂CO₃ in ethylene glycol solution has huge advantage on the formation and stability of ACC. The rigorous operation is needed to obtain ACC in liquid–solid and solid–solid reaction systems. This work contributes to thorough understanding the preparation of ACC and vaterite in different reaction systems.

{"title":"Polymorph design of CaCO3 from stable calcite to metastable vaterite and amorphous CaCO3 via altering reaction system step by step","authors":"Jiuxin Jiang , Qinyu Li , Peiqing Yan , Shengbo Xu , Yutong Zhou , Danting Zheng","doi":"10.1016/j.apt.2024.104758","DOIUrl":"10.1016/j.apt.2024.104758","url":null,"abstract":"<div><div>Despite the pivotal roles of amorphous calcium carbonate (ACC) and vaterite in the biomineralization process, drug delivery and biomedical engineering, their thermodynamic instability poses substantial challenges in their preparation. Although many synthesis methods for ACC and vaterite have been developed, the polymorph discrimination of CaCO<sub>3</sub> in different reaction system remains unclear. In the present work, the polymorph of CaCO<sub>3</sub> is designed by altering reaction system step by step under the same or similar parameters, i.e. liquid–liquid reaction between CaCl<sub>2</sub> and Na<sub>2</sub>CO<sub>3</sub>/K<sub>2</sub>CO<sub>3</sub> in aqueous solution, ethanol–water solution, ethanol/ethylene glycol solution, liquid–solid in ethylene glycol solvent and solid–solid reaction assisted by mechanical energy. The results indicate that the partial substitution of water by ethanol in aqueous reaction system has no obvious advantage on the formation and stability of vaterite, while the whole substitution of CaCl<sub>2</sub> aqueous solution by CaCl<sub>2</sub> ethanol solution has significant advantage on vaterite formation and its stability. Furthermore, the reaction between CaCl<sub>2</sub> and K<sub>2</sub>CO<sub>3</sub> in ethylene glycol solution has huge advantage on the formation and stability of ACC. The rigorous operation is needed to obtain ACC in liquid–solid and solid–solid reaction systems. This work contributes to thorough understanding the preparation of ACC and vaterite in different reaction systems.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104758"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102506","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

Microgels stabilized selenium nanoparticles: An efficient photocatalyst for dye degradation

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104756

Neha Garg , Priyanshi Agnihotri , Abhijit Dan , Savita Chaudhary , Ahmad Umar

We developed selenium nanoparticle (Se-NP)-embedded poly-N-isopropylacrylamide (PNIPAM) hybrid microgel (nano-SeHMG) for the photodegradation of victoria blue (VB) dye in an aqueous medium. PNIPAM microgels were prepared by free radical precipitation polymerization, and Se-NPs were formed inside the polymer network using in situ reduction of selenous acid with NaBH₄. Surface characterization of bare Se-NPs, pure PNIPAM, and nano-SeHMG was conducted. Controlled-size Se-NPs, averaging 31 ± 4.8 nm, were embedded within the microgels, providing stability against agglomeration and resulting in a large surface area. Nano-SeHMG achieved 98 % degradation of VB dye in 80 min, compared to 23 % and 68 % degradation with pure PNIPAM and bare Se-NPs, respectively, under the same conditions. The photocatalytic reduction of VB followed pseudo-first-order kinetics with an apparent rate constant of 7.33 × 10^-3 min^-1. Factors such as contact time, catalyst dosage, initial dye concentration, temperature, and pH significantly influenced the catalytic performance of nano-SeHMG. The thermo-responsive behavior of microgels allowed tunable catalytic activity by adjusting the system temperature. The photocatalyst demonstrated excellent recyclability, making it a cost-effective material for dye degradation. Hybrid microgel-based photocatalysts offer a novel approach in designing smart materials for wastewater treatment.

{"title":"Microgels stabilized selenium nanoparticles: An efficient photocatalyst for dye degradation","authors":"Neha Garg , Priyanshi Agnihotri , Abhijit Dan , Savita Chaudhary , Ahmad Umar","doi":"10.1016/j.apt.2024.104756","DOIUrl":"10.1016/j.apt.2024.104756","url":null,"abstract":"<div><div>We developed selenium nanoparticle (Se-NP)-embedded poly-N-isopropylacrylamide (PNIPAM) hybrid microgel (nano-SeHMG) for the photodegradation of victoria blue (VB) dye in an aqueous medium. PNIPAM microgels were prepared by free radical precipitation polymerization, and Se-NPs were formed inside the polymer network using <em>in situ</em> reduction of selenous acid with NaBH<sub>4</sub>. Surface characterization of bare Se-NPs, pure PNIPAM, and nano-SeHMG was conducted. Controlled-size Se-NPs, averaging 31 ± 4.8 nm, were embedded within the microgels, providing stability against agglomeration and resulting in a large surface area. Nano-SeHMG achieved 98 % degradation of VB dye in 80 min, compared to 23 % and 68 % degradation with pure PNIPAM and bare Se-NPs, respectively, under the same conditions. The photocatalytic reduction of VB followed pseudo-first-order kinetics with an apparent rate constant of 7.33 × 10<sup>-3</sup> min<sup>-1</sup>. Factors such as contact time, catalyst dosage, initial dye concentration, temperature, and pH significantly influenced the catalytic performance of nano-SeHMG. The thermo-responsive behavior of microgels allowed tunable catalytic activity by adjusting the system temperature. The photocatalyst demonstrated excellent recyclability, making it a cost-effective material for dye degradation. Hybrid microgel-based photocatalysts offer a novel approach in designing smart materials for wastewater treatment.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104756"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102510","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

DEM-CFD investigation of particle motion characteristic in a guidance restraint-airflow blowing seed guiding device

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104747

Rui Liu, Guangqiang Zhang, Yuejin Xiao, Binxin Yan, Zhijun Meng, Jianjun Dong, Guangwei wu

Sowing uniformity is critical to the quality of maize growth and yield. The performance of the seed guiding is key to determining sowing uniformity. In this work, a guidance restraint-airflow blowing seed guiding device was investigated using the coupled CFD and DEM approach. The study analyzed the effect of variables related to the seed-guiding device on the particle motion characteristics. The results showed that for the B-type guiding restraint segment, allowing seeds to quickly enter the seed guiding device at the same position, thereby providing an orderly seed flow for the subsequent airflow to effectively guide the seeds. The contraction port height is large and the stable acceleration segment length is small, the airflow has poor restraining ability on the seeds’ movement, making them prone to collision and bouncing. Subsequently, the seed guiding performance of the guided restraint-airflow blowing seed guiding device was verified. The results showed that the uniformity of grain spacing was good, meeting the requirements for precision maize sowing. In specific, the seed spacing coefficient of variation (SSCV) and average seed spacing (ASS) were 8.9 % and 24.5 cm at the height of the shrinkage port, length of the stable acceleration section and guiding restraint segment structure were 5 mm, 100 mm and B-type.

{"title":"DEM-CFD investigation of particle motion characteristic in a guidance restraint-airflow blowing seed guiding device","authors":"Rui Liu, Guangqiang Zhang, Yuejin Xiao, Binxin Yan, Zhijun Meng, Jianjun Dong, Guangwei wu","doi":"10.1016/j.apt.2024.104747","DOIUrl":"10.1016/j.apt.2024.104747","url":null,"abstract":"<div><div>Sowing uniformity is critical to the quality of maize growth and yield. The performance of the seed guiding is key to determining sowing uniformity. In this work, a guidance restraint-airflow blowing seed guiding device was investigated using the coupled CFD and DEM approach. The study analyzed the effect of variables related to the seed-guiding device on the particle motion characteristics. The results showed that for the B-type guiding restraint segment, allowing seeds to quickly enter the seed guiding device at the same position, thereby providing an orderly seed flow for the subsequent airflow to effectively guide the seeds. The contraction port height is large and the stable acceleration segment length is small, the airflow has poor restraining ability on the seeds’ movement, making them prone to collision and bouncing. Subsequently, the seed guiding performance of the guided restraint-airflow blowing seed guiding device was verified. The results showed that the uniformity of grain spacing was good, meeting the requirements for precision maize sowing. In specific, the seed spacing coefficient of variation (<em>SSCV</em>) and average seed spacing (<em>ASS</em>) were 8.9 % and 24.5 cm at the height of the shrinkage port, length of the stable acceleration section and guiding restraint segment structure were 5 mm, 100 mm and B-type.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104747"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102504","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 hybrid EMD-GRU model for pressure prediction in air cyclone centrifugal classifiers

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104743

Haishen Jiang , Wenhao Li , Yuhan Liu , Runyu Liu , Yadong Yang , Chenlong Duan , Long Huang

Predicting the pressure in air cyclone centrifugal classifiers is important for analyzing the flow field and improving classification performance, but traditional methods struggle due to the presence of noise in the pressure signals. In this study, a model combining empirical mode decomposition (EMD) and gate recurrent unit (GRU) is proposed and genetic algorithm (GA) is used to further increase the prediction accuracy of the model. The air pressure at the feeding port, fine particle discharge port and coarse particle discharge port of the air classifier are selected for prediction and the intrinsic mode functions (IMFs) with high correlation are selected for the denoising effect using EMD and the Pearson correlation coefficient (PCC). Signal denoising facilitates better feature extraction and simplifies neural network models. The results show that the best prediction among five models is achieved by the EMD-GRU model, with a root mean square error (RMSE) of 0.0549, 0.0177, and 0.0203 for the three ports. In addition, the effects of different parameters on the classification efficiency of the air classifier are investigated. The results reveal that the air classifier can achieve the best classification effect when the rotational frequency is 10.83 Hz, the feeding rate is 0.4 kg/s and the inclination angle is −4°. This study introduces a new idea for pressure prediction and flow field simulation in air classifiers and provides a new reference for optimizing the classification performance of air cyclone centrifugal classifiers.

{"title":"A hybrid EMD-GRU model for pressure prediction in air cyclone centrifugal classifiers","authors":"Haishen Jiang , Wenhao Li , Yuhan Liu , Runyu Liu , Yadong Yang , Chenlong Duan , Long Huang","doi":"10.1016/j.apt.2024.104743","DOIUrl":"10.1016/j.apt.2024.104743","url":null,"abstract":"<div><div>Predicting the pressure in air cyclone centrifugal classifiers is important for analyzing the flow field and improving classification performance, but traditional methods struggle due to the presence of noise in the pressure signals. In this study, a model combining empirical mode decomposition (EMD) and gate recurrent unit (GRU) is proposed and genetic algorithm (GA) is used to further increase the prediction accuracy of the model. The air pressure at the feeding port, fine particle discharge port and coarse particle discharge port of the air classifier are selected for prediction and the intrinsic mode functions (IMFs) with high correlation are selected for the denoising effect using EMD and the Pearson correlation coefficient (PCC). Signal denoising facilitates better feature extraction and simplifies neural network models. The results show that the best prediction among five models is achieved by the EMD-GRU model, with a root mean square error (RMSE) of 0.0549, 0.0177, and 0.0203 for the three ports. In addition, the effects of different parameters on the classification efficiency of the air classifier are investigated. The results reveal that the air classifier can achieve the best classification effect when the rotational frequency is 10.83 Hz, the feeding rate is 0.4 kg/s and the inclination angle is −4°. This study introduces a new idea for pressure prediction and flow field simulation in air classifiers and provides a new reference for optimizing the classification performance of air cyclone centrifugal classifiers.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104743"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102540","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

Multi-element synergistic effect based on functionalized porphyrin organic frameworks: Towards for promoting fire safety of epoxy

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104759

Jiale Zhang , Lian Yin , Jianjian Luo , Keqing Zhou , Yongqian Shi , Bin Yu , Jiawei Wu , Yichao Lin

Epoxy resins (EP) is classic thermosetting material, but its flammability severely limits its usage. In this paper, a novel flame retardant (FePor@PZS) was synthesized by growing polyphosphazene (PZS) in situ onto the surface of iron porphyrin organic frameworks (FePor). Attributed to the synergistic flame retardant system of nitrogen, phosphorus and iron elements, FePor@PZS endowed excellent fire safety property to EP. Upon incorporating 2 wt% FePor@PZS, EP/FePor@PZS got an LOI value of 27.3%, achieving the V-1 level in the test of UL-94. Besides, the peak rate of heat release, release of total heat, peak rate of smoke production, production of total smoke, peak rate of CO₂ production and peak rate of CO production of EP/FePor@PZS were decreased by 31.8%, 21.5%, 17.5%, 22.3%, 34.8% and 73.5%, respectively, and the quantity of residual carbon increased from 9.69% to 27.86%, compared with neat EP. FePor could break off to form a single pyrrole ring to promote the generation of the early carbon layers. Additionally, the Fe element in FePor and the P element in PZS played a role of catalytic carbonization. Meanwhile, PZS could decompose into non-combustible gases, and produce PO• and HPO• radicals to terminate the EP chain-opening reaction. This research gives a novel approach for the application of porphyrin derivatives in flame retardant composites.

{"title":"Multi-element synergistic effect based on functionalized porphyrin organic frameworks: Towards for promoting fire safety of epoxy","authors":"Jiale Zhang , Lian Yin , Jianjian Luo , Keqing Zhou , Yongqian Shi , Bin Yu , Jiawei Wu , Yichao Lin","doi":"10.1016/j.apt.2024.104759","DOIUrl":"10.1016/j.apt.2024.104759","url":null,"abstract":"<div><div>Epoxy resins (EP) is classic thermosetting material, but its flammability severely limits its usage. In this paper, a novel flame retardant (FePor@PZS) was synthesized by growing polyphosphazene (PZS) in situ onto the surface of iron porphyrin organic frameworks (FePor). Attributed to the synergistic flame retardant system of nitrogen, phosphorus and iron elements, FePor@PZS endowed excellent fire safety property to EP. Upon incorporating 2 wt% FePor@PZS, EP/FePor@PZS got an LOI value of 27.3%, achieving the V-1 level in the test of UL-94. Besides, the peak rate of heat release, release of total heat, peak rate of smoke production, production of total smoke, peak rate of CO<sub>2</sub> production and peak rate of CO production of EP/FePor@PZS were decreased by 31.8%, 21.5%, 17.5%, 22.3%, 34.8% and 73.5%, respectively, and the quantity of residual carbon increased from 9.69% to 27.86%, compared with neat EP. FePor could break off to form a single pyrrole ring to promote the generation of the early carbon layers. Additionally, the Fe element in FePor and the P element in PZS played a role of catalytic carbonization. Meanwhile, PZS could decompose into non-combustible gases, and produce PO• and HPO• radicals to terminate the EP chain-opening reaction. This research gives a novel approach for the application of porphyrin derivatives in flame retardant composites.</div></div>","PeriodicalId":7232,"journal":{"name":"Advanced Powder Technology","volume":"36 1","pages":"Article 104759"},"PeriodicalIF":4.2,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143102509","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

Study on the influence of pre-injection blocking fluid on the pore and fracture structure of coal and its seepage law

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104733

Fuqian Wan , Lulu Sun , Guansheng Qi , Quanlin Shi , Haishan Wang , Mingyu Zhan , Shoulei Duan

To study the influence of pre-injection blocking fluid on the pore and fracture structure of coal and its seepage law, CT three-dimensional reconstruction technology was used to characterize the coal structure. Using Comsol software to simulate the flow characteristics of the blocking fluid in the fractures of coal. At 200 °C, compared with the untreated coal, the specific surface area, pore volume, and connectivity of the treated coal show the most significant changes, reducing by 24.24 %, 32.87 %, and 7.04 %, respectively. When the injection pressure of the blocking liquid is 3.1 MPa, the overall flow velocity of the blocking liquid is relatively high, and the maximum flow velocity occurs at the larger pore size where the blocking liquid has fully developed, that is, at the cross-sectional position of 192 μm. Research has shown that changes in coal structure can affect the flow characteristics of the blocking fluid inside the coal. At 200 °C, the inhibitory ability of the blocking liquid on the pore and fracture structure and connectivity development of the coal sample is stronger, which can suppress the circulation of oxygen inside the coal sample and is more conducive to the prevention and control of coal spontaneous combustion fires. The research results provide valuable technical support for the evaluation of the fire prevention and extinguishing effects of pre-injection inhibitors and the optimization of technology.

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引用次数: 0

Corrigendum to “Development of ions adsorption onto nanoparticles from water/wastewater sources via novel nanocomposite materials: A machine learning-based approach [Adv. Powder Technol. 35(6) (2024) 104462]

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology

Pub Date : 2025-01-01 DOI: 10.1016/j.apt.2024.104752

Sirajunisa Talath , Adil Farooq Wali , Sathvik B. Sridhar , Umme Hani , Muteb Alanazi , Tareq Nafea Alharby

引用次数: 0

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