Particuology最新文献_第7页

A novel critical velocity model for the incipient motion of non-spherical particles on cuttings bed in extended reach wells

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.12.011

Wei Hu , Ning Guan , Jinya Zhang , Binggui Xu , Hongwu Zhu

{"title":"A novel critical velocity model for the incipient motion of non-spherical particles on cuttings bed in extended reach wells","authors":"Wei Hu , Ning Guan , Jinya Zhang , Binggui Xu , Hongwu Zhu","doi":"10.1016/j.partic.2024.12.011","DOIUrl":"10.1016/j.partic.2024.12.011","url":null,"abstract":"<div><div>Accurately predicting the minimum velocity required to initiate particles movement on a cuttings bed surface during drilling operations is crucial for efficient and cost-effective removal of deposited particles. However, current models neglect the influence of particle shape on the drag coefficient and static friction coefficient during rolling and sliding on a cuttings bed. Accordingly, this study developed an experimental setup for cuttings transport and employed both theoretical analysis and experimental methods to investigate the critical velocity for the incipient motion of particles under various operational conditions. A novel semi-mechanical criterion model was developed for the incipient motion of particles, incorporating a shape correction factor for non-spherical particles. A balance equation for the threshold Shields number, determined by particle driving forces and resistances, was established, and a numerical procedure was formulated to determine the critical velocity for the incipient motion of particles. The model predictions show strong agreement with experimental results. The study found that higher eccentricity, inclination, and fluid viscosity increased the difficulty of initiating particle movement on the cuttings bed surface, thus requiring higher annular velocities for effective cuttings removal. Conversely, increasing particle size facilitated easier removal of the cuttings bed. Compared to non-Newtonian fluids, Newtonian fluids proved more effective in cuttings removal. The findings of this study are significant for optimizing hole cleaning parameters and improving the efficiency of cuttings removal.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 193-206"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DEM investigation into the coupling effects of particle asphericity and interface roughness on shear behaviour of soil-structure interface

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.11.019

Dong Su , Dongzhan Wu , Meng Fan , Runqi Zhang , Jianhang Chen , Hao Xiong , Xiangsheng Chen

{"title":"DEM investigation into the coupling effects of particle asphericity and interface roughness on shear behaviour of soil-structure interface","authors":"Dong Su , Dongzhan Wu , Meng Fan , Runqi Zhang , Jianhang Chen , Hao Xiong , Xiangsheng Chen","doi":"10.1016/j.partic.2024.11.019","DOIUrl":"10.1016/j.partic.2024.11.019","url":null,"abstract":"<div><div>Soil-structure interfaces (SSI) are common in geotechnical structures, and understanding their shear behavior is essential for effective design. However, the coupling effects of particle shape and interface roughness on SSI remain understudied. This study addresses this gap by employing five types of super-ellipsoid particles with varying asphericity (<em>η</em>) values to model non-spherical particles. Interface shear tests with different roughness levels (<em>R</em><sub><em>n</em></sub>) were conducted using Discrete Element Method (DEM) simulations. The results show that both <em>η</em> and <em>R</em><sub><em>n</em></sub> significantly influence shear strength, localized shear band thickness, and soil fabric, with two types of coupling effects: single-factor dominance and double-factor interaction. The influence on coordination number (<em>C</em><sub><em>n</em></sub>) and probability distribution of normalized contact force is more straightforward. Specifically, non-spherical particles exhibit a higher initial <em>C</em><sub><em>n</em></sub> due to enhanced interlocking, while <em>R</em><sub><em>n</em></sub> has a lesser impact. The normalized contact force at the interface follows an exponential distribution, similar to pure soil, and is largely independent of <em>η</em> and <em>R</em><sub><em>n</em></sub>. Notably, the shear zone is divided into three equal parts for soil fabric analysis. These findings offer new insights into SSI, contributing to more effective and safer geotechnical designs.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 39-57"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on single-unit solid particle packed bed for thermal energy storage of extracted steam from thermal power plant to consume more renewable energy

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.12.007

Xiang Liu, Huaan Li, Laiquan Lv, Lijia Wei, Hao Zhou

{"title":"Experimental study on single-unit solid particle packed bed for thermal energy storage of extracted steam from thermal power plant to consume more renewable energy","authors":"Xiang Liu, Huaan Li, Laiquan Lv, Lijia Wei, Hao Zhou","doi":"10.1016/j.partic.2024.12.007","DOIUrl":"10.1016/j.partic.2024.12.007","url":null,"abstract":"<div><div>Solid particles instead of molten salt as a heat storage medium for extracted steam energy storage are essential in thermal power flexibility retrofit. This study constructs a charge-discharge experimental device using by-products from the steel industry as heat storage materials, similar to a battery cell, which is easily scalable and accomplishes the steam-solid particle-steam energy conversion. Investigation parameters include temperature distribution, power variation, and cycle efficiency for different charging and discharging modes. Results indicate that the charging mode II outperforms mode I in temperature uniformity, charging flow rate, and pressure loss, yielding higher charging power and total convective heat transfer coefficients at 13 kW and 275 W/(m<sup>2</sup> K), respectively. The pilot device demonstrates commendable insulating properties. Its heat dissipation rate is approximately 33.33%, which surpasses that of reported thermal storage devices. Moreover, the mode II exhibits superior temperature non-uniformity during heat release, ensuring that 40 kg/h of superheated steam at 220 °C can be produced continuously for 5 min. The cycling efficiency is noteworthy, reaching 65% in low flow rate discharge, accompanied by 79% charging efficiency and 82% discharging efficiency. A temperature difference cloud map elucidates the primary phase change region, emphasizing preheating, evaporation, and superheating segments. Experimental results provide new ideas for combining waste elimination in the steel industry and energy storage in thermal power plants.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 99-116"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-dimensional CFD-DEM investigation of dynamic characteristics of biomass particles in a conical spouted bed

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.11.013

Ming Hao , Xiaolong Xing

{"title":"Three-dimensional CFD-DEM investigation of dynamic characteristics of biomass particles in a conical spouted bed","authors":"Ming Hao , Xiaolong Xing","doi":"10.1016/j.partic.2024.11.013","DOIUrl":"10.1016/j.partic.2024.11.013","url":null,"abstract":"<div><div>A numerical investigation of the three-dimensional conical spouted bed was conducted using CFD coupled with discrete element method to systematically analyze particle-gas flow patterns, bubble volume fluctuations, and fountain characteristics. Moreover, the impact of conical angles on dynamic characteristics is demonstrated under varying gas inlet velocity and particle diameter. Firstly, the simulation result shows that increasing the conical angle is advantageous for enhancing both <em>y</em>-direction and angular velocities of particles, while the impact of this angle varies with inlet velocity and particle diameter. The great inlet velocity and particle diameter significantly enhance the voidage, while the larger conical angle promotes the uniform radial particle distribution. Besides, smaller conical angle and medium inlet velocity is prone to result in the higher frequency and amplitude for the fluctuations of particle height. Meanwhile, enlarging the conical angle results in a shift of the fountain frequency from high to low when the particle size is small. The conical angle plays a crucial role in determining bubble behavior under the condition of medium velocity and small diameter. Besides, the fine particle and small conical angle are prone to cause the noticeable main frequencies.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 207-218"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green synthesis and eco-biological evaluation of Ag/Fe bimetallic nanoparticles using Vallaris solanacea leaf extract targeting insecticide resistance

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.12.003

Arooj Azeem , Muhammad Naveed , Sarmad Mahmood , Shafiq ur Rehman , Tariq Aziz , Nouf A. Assiri , Sahar A. Alshareef , Maha Aljabri , Rewaa S. Jalal , Fakhria A. Al-Joufi

{"title":"Green synthesis and eco-biological evaluation of Ag/Fe bimetallic nanoparticles using Vallaris solanacea leaf extract targeting insecticide resistance","authors":"Arooj Azeem , Muhammad Naveed , Sarmad Mahmood , Shafiq ur Rehman , Tariq Aziz , Nouf A. Assiri , Sahar A. Alshareef , Maha Aljabri , Rewaa S. Jalal , Fakhria A. Al-Joufi","doi":"10.1016/j.partic.2024.12.003","DOIUrl":"10.1016/j.partic.2024.12.003","url":null,"abstract":"<div><div>The emergence of insecticide resistance presents a major challenge in pest control and agriculture, while the use of conventional pesticides raises environmental and health concerns. This study addresses these issues through the green synthesis of Ag/Fe bimetallic nanoparticles (BMNPs) using <em>Vallaris solanacea</em> plant extract and evaluates their eco-biological activities. The synthesized Ag/Fe BMNPs, with an average size of 30 nm as determined by SEM, were characterized by UV–Vis spectroscopy, FTIR, EDX, and SEM. In vitro assays revealed significant anti-inflammatory (91%), antioxidant (95%), anti-diabetic, anti-hemolytic, and antimicrobial activities. Additionally, the nanoparticles demonstrated 100% mortality against <em>Sitophilus oryzae</em> (rice weevil) and exhibited 97% degradation of the pesticide Novacide, indicating potent pesticidal and environmental remediation capabilities. Computational analysis, including molecular docking and molecular dynamics simulations, revealed strong interactions between Ag/Fe BMNPs and insecticide resistance (IR) proteins, with binding energies surpassing those of traditional pesticides, suggesting an ability to circumvent resistance mechanisms. These findings highlight the potential of Ag/Fe BMNPs as a sustainable, eco-friendly alternative for pest management and environmental applications in agriculture and beyond.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 80-98"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigations on the deposition characteristics of lunar dust in the human bronchial airways

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.11.018

Hao Jing , Yuan Xue , Bin Wu , Yixiao Wang , Zhaojun Xi , Xinguang Cui

{"title":"Numerical investigations on the deposition characteristics of lunar dust in the human bronchial airways","authors":"Hao Jing , Yuan Xue , Bin Wu , Yixiao Wang , Zhaojun Xi , Xinguang Cui","doi":"10.1016/j.partic.2024.11.018","DOIUrl":"10.1016/j.partic.2024.11.018","url":null,"abstract":"<div><div>Although it is widely acknowledged that lunar dust (LD) is toxic to the human health, its deposition characteristics in the bronchial airways remain unknown, which is significantly important to understand its toxicity. Therefore, this study employs computational fluid dynamics and machine learning algorithm methods to address this issue considering the difficulty of conducting the experiments of LD deposition. The major results are: (1) the deposition efficiencies (DE) of micrometer-sized LD in the terminal bronchioles vary significantly depending on the human body posture, with a notable difference of DE up to 29% between standing and lying flat postures; (2) LD deposition in various bronchial regions shows differences under activity intensities, with higher DE in segmental bronchi and terminal bronchioles under intense and lower intensive activities, respectively; (3) In predicting DE of LD, machine learning algorithms outperform fitting functions, achieving higher precision and smaller errors, reducing the root mean square error by approximately 60%–80%. These results indicate that LD deposition characteristics in the bronchial airways under lunar environment are also influenced by the combined factors of particle size, activity intensity, and body posture.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 25-38"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

One-step synthesis of hierarchically porous fly ash-based NaX zeolite as assisted by CTAB for low-concentration CO2 adsorption

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.12.002

Yao Wei , Hong Wu , Haowen Kong , Yingju Miao , Ping Wang

{"title":"One-step synthesis of hierarchically porous fly ash-based NaX zeolite as assisted by CTAB for low-concentration CO2 adsorption","authors":"Yao Wei , Hong Wu , Haowen Kong , Yingju Miao , Ping Wang","doi":"10.1016/j.partic.2024.12.002","DOIUrl":"10.1016/j.partic.2024.12.002","url":null,"abstract":"<div><div>Despite significant attention being drawn to the synthesis of zeolites from fly ash for CO<sub>2</sub> adsorption, few studies have focused on hierarchical porous NaX zeolites derived from fly ash. The existing synthesis methods are often complex, and the role of CTAB in zeolite formation remains unclear. To address these research gaps, we employed a one-step method for synthesizing hierarchically porous fly ash-based NaX zeolites with tunable mesoporosity. Utilizing CTAB as a template agent, we conducted a comprehensive investigation into the effects of varying CTAB dosages and aluminum source types on zeolite formation. The synthesized materials were fully characterized through XRD, FTIR, SEM, TEM, and N<sub>2</sub> adsorption/desorption analysis. The results showed that the mesoporous volume of the zeolites can be effectively controlled by adjusting the CTAB/Al<sub>2</sub>O<sub>3</sub> ratio. At an optimal ratio of 0.04, the synthesized zeolite has a surface area of 422 m<sup>2</sup>/g and a mesoporous volume of 0.116 cm<sup>3</sup>/g, which represents a two-fold increase compared to the NaX synthesized without CTAB. This improvement of mesoporosity significantly reduces the resistance to CO<sub>2</sub> diffusion, thereby enhancing the adsorption performance with a maximum adsorption capacity of 3.37 mmol/g and a high cyclic stability. A further investigation reveals the crucial role of CTAB in promoting mesopore formation and inhibiting crystal growth during zeolite synthesis. These findings provide valuable insights into the one-step synthesis of hierarchical porous zeolites.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 69-79"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A meso-scale flow model of gas-liquid-solid mini-fluidized beds with improved macro-scale interaction of wall effects

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.12.005

Shaojie Li , Yongli Ma , Hao Guo , Mingyan Liu

{"title":"A meso-scale flow model of gas-liquid-solid mini-fluidized beds with improved macro-scale interaction of wall effects","authors":"Shaojie Li , Yongli Ma , Hao Guo , Mingyan Liu","doi":"10.1016/j.partic.2024.12.005","DOIUrl":"10.1016/j.partic.2024.12.005","url":null,"abstract":"<div><div>Gas-liquid-solid mini-fluidized beds known for high efficiency with controllable mass and heat transfer characteristics, have good application prospects in fields such as multiphase reaction process enhancement and intrinsic kinetic detection. For three-phase mini-flow systems, the bed wall has a significant impact on spatiotemporal distribution of multi-phase flow structure, which influence the motion state of dispersed phase, make predicted phase holdup and residence time deviate from experimental values. However, current research on the quantitative impact of bed walls on flow structures is still limited, which hinders the optimization design and industrial application of such reactors. In this work, a meso-scale flow model of gas-liquid-solid mini-fluidized beds considering macro-scale effects between bed wall and flow is developed based on the principle of meso-scale science and introducing semi-theoretical formulas that take the effects of bed walls on particles and bubbles into account. The calculated values of this model are in good agreement with experimental data, where prediction of phase holdup fits well with experimental results, the deviation of bubble size and terminal velocity are within 10%. Compared to existing models, this model demonstrates a higher level of accuracy in predicting the flow patterns of mini-fluidized beds, particularly those with pronounced wall effect. This research has laid a foundation for the design, scale-up and industrial application of mini-fluidized bed reactors.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 117-129"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the role of cationic lipids in modulating immunogenicity and vaccine efficacy of mRNA-LNP

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.11.011

Yan Zhou , Xiangfei Shan , Renji Gu , Yufei Xia , Xiaonan Huang

{"title":"Exploring the role of cationic lipids in modulating immunogenicity and vaccine efficacy of mRNA-LNP","authors":"Yan Zhou , Xiangfei Shan , Renji Gu , Yufei Xia , Xiaonan Huang","doi":"10.1016/j.partic.2024.11.011","DOIUrl":"10.1016/j.partic.2024.11.011","url":null,"abstract":"<div><div>The mRNA vaccines have become a transformative platform in medicine, with their success during the COVID-19 pandemic accelerating research in viral prevention and cancer therapy. Lipid nanoparticles (LNPs) enhance the stability and efficacy of mRNA vaccines, but achieving an optimal balance between innate immune activation and mRNA expression is crucial for their effectiveness. Classical cationic lipids, although largely replaced by ionizable lipids due to concerns over excessive immunogenicity, have demonstrated potential in cancer immunotherapy by inducing strong immune responses. In this study, we investigated whether incorporating cationic lipids into mRNA-LNP formulations could enhance immunogenicity without requiring new lipid designs. We introduced varying proportions of cationic lipids into D-Lin-MC3-DMA and SM-102-based LNPs and evaluated their impact on innate immune activation, along with long-term humoral and cellular immune responses. Our results showed that in MC3-based LNPs, cationic lipids significantly improved anti-tumor efficacy, though slightly diminished long-term humoral and cellular immunity. In contrast, in SM-102-based LNPs, cationic lipids enhanced anti-tumor effects without negatively impacting long-term immunity. These findings suggest that adding cationic lipid as an additional component allows for the fine-tuning of mRNA-LNP immunogenicity, expanding the potential applications of mRNA vaccines and simplifying LNP design.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 1-11"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controllable synthesis of uniform small-sized MgCO3 from Mg2+ concentrated seawater brine for the preparation of epoxy resin composite and high purity MgO

IF 4.1 2区材料科学

Particuology Pub Date : 2025-02-01 DOI: 10.1016/j.partic.2024.12.012

Shuo Yan, Hongfei Guo, Dapeng Zhang, Yun Li, Jilin Cao

{"title":"Controllable synthesis of uniform small-sized MgCO3 from Mg2+ concentrated seawater brine for the preparation of epoxy resin composite and high purity MgO","authors":"Shuo Yan, Hongfei Guo, Dapeng Zhang, Yun Li, Jilin Cao","doi":"10.1016/j.partic.2024.12.012","DOIUrl":"10.1016/j.partic.2024.12.012","url":null,"abstract":"<div><div>The large and uneven grain size of anhydrous magnesium carbonate (MgCO<sub>3</sub>) seriously restricts its application ranges and performances. In this study, we proposed a controllable and cost-effective strategy to synthesize uniform small-sized MgCO<sub>3</sub> from Mg<sup>2+</sup> concentrated seawater brine in the absence of crystal modifiers. In this process, solid NaOH was directly added to Mg<sup>2+</sup> concentrated seawater brine to completely and rapidly convert Mg<sup>2+</sup> to magnesium hydroxide (Mg(OH)<sub>2</sub>) nanoparticles. These nanoparticles are redispersed in water to form the colloidal system, where Mg(OH)<sub>2</sub> nanoparticles hydrothermally reacts with urea to obtain uniform small-sized MgCO<sub>3</sub> particles. The influence of reaction temperature, reaction time, and the molar ratio of magnesium ions to urea on the synthesis of MgCO<sub>3</sub> is systematically investigated. In the highly-dispersed and stable colloidal system, Mg(OH)<sub>2</sub> nanoparticles could exert an effective and sustained retarding effect on the hydrolysis rate of urea by attracting free water, resulting in the controllable release of NH<sub>4</sub><sup>+</sup>, CO<sub>3</sub><sup>2−</sup>, and Mg<sup>2+</sup>. This study presents a simple route to realize the controllable synthesis of uniform small-sized MgCO<sub>3</sub> particles, and demonstrates the feasibility of using MgCO<sub>3</sub> as an ideal filler for enhancing the performance of polymers as well as an ideal precursor for high-purity MgO production.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"97 ","pages":"Pages 154-166"},"PeriodicalIF":4.1,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143134461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0