Pub Date : 2025-12-30DOI: 10.1016/j.matchemphys.2025.132000
Andi Dana Rifkasari , Heryanto Heryanto , Dahlang Tahir , S. D. Astuty , Mohammad I Abualsayed , Abdelillah Akouibaa , Yasser Maghrbi , Restu Widiatmono , Ali Hamed Alomari , Roslah Abdullah
Increased exposure to X-rays in the medical sector, necessitates the development of effective and environmentally friendly radiation shielding materials as an alternative to lead. Here, we report the fabrication and characterization of a composite-based flexible radiation-shielding apron with a Hydroxyethyl cellulose (HEC) and polyvinyl alcohol (PVA) matrix, doped with Bismuth Oxide (Bi2O3) and various concentrations of magnetite (Fe3O4). Sample A1 consisted (4.5 g of HEC-Bi2O3 without Fe3O4), whereas A2 (4 g of HEC-Bi2O3 with 0.5 g of Fe3O4), and A3 (3.5 g of HEC-Bi2O3 with 1 g of Fe3O4), respectively. The evaluation of the shielding capability showed that A2 shows the lowest HVL of 0.185 cm, TVL of 0.617 cm, and MFP of 0.268 cm, signifying the high attenuation performance. Additionally, A2 recorded the highest linear attenuation coefficient of 3.73 cm−1 and mass of 3.53 cm2/g for 60 keV, which is close to the XCOM reference data. Mechanical testing showed that A2 has suitable a tensile strength of 2.73 MPa and Young's modulus of 5.60 MPa as apron material. SEM images confirmed that A2 has the narrowest and most homogeneous particle size distribution (0.76 ± 0.08 μm), whereas A3 showed agglomeration. These results confirm that the addition of 0.5 g Fe3O4 produces the promising mechanical structure and radiation shielding capability, making A2 sample as an promising material for lightweight and sustainable X-ray shielding applications.
{"title":"Hydroxyethyl cellulose-Bi2O3 modified with Fe3O4 from iron sand as apron X-ray shielding material","authors":"Andi Dana Rifkasari , Heryanto Heryanto , Dahlang Tahir , S. D. Astuty , Mohammad I Abualsayed , Abdelillah Akouibaa , Yasser Maghrbi , Restu Widiatmono , Ali Hamed Alomari , Roslah Abdullah","doi":"10.1016/j.matchemphys.2025.132000","DOIUrl":"10.1016/j.matchemphys.2025.132000","url":null,"abstract":"<div><div>Increased exposure to X-rays in the medical sector, necessitates the development of effective and environmentally friendly radiation shielding materials as an alternative to lead. Here, we report the fabrication and characterization of a composite-based flexible radiation-shielding apron with a Hydroxyethyl cellulose (HEC) and polyvinyl alcohol (PVA) matrix, doped with Bismuth Oxide (Bi<sub>2</sub>O<sub>3</sub>) and various concentrations of magnetite (Fe<sub>3</sub>O<sub>4</sub>). Sample A1 consisted (4.5 g of HEC-Bi<sub>2</sub>O<sub>3</sub> without Fe<sub>3</sub>O<sub>4</sub>), whereas A2 (4 g of HEC-Bi<sub>2</sub>O<sub>3</sub> with 0.5 g of Fe<sub>3</sub>O<sub>4</sub>), and A3 (3.5 g of HEC-Bi<sub>2</sub>O<sub>3</sub> with 1 g of Fe<sub>3</sub>O<sub>4</sub>), respectively. The evaluation of the shielding capability showed that A2 shows the lowest HVL of 0.185 cm, TVL of 0.617 cm, and MFP of 0.268 cm, signifying the high attenuation performance. Additionally, A2 recorded the highest linear attenuation coefficient of 3.73 cm<sup>−1</sup> and mass of 3.53 cm<sup>2</sup>/g for 60 keV, which is close to the XCOM reference data. Mechanical testing showed that A2 has suitable a tensile strength of 2.73 MPa and Young's modulus of 5.60 MPa as apron material. SEM images confirmed that A2 has the narrowest and most homogeneous particle size distribution (0.76 ± 0.08 μm), whereas A3 showed agglomeration. These results confirm that the addition of 0.5 g Fe<sub>3</sub>O<sub>4</sub> produces the promising mechanical structure and radiation shielding capability, making A2 sample as an promising material for lightweight and sustainable X-ray shielding applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 132000"},"PeriodicalIF":4.7,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-30DOI: 10.1016/j.matchemphys.2025.132006
Jae-Young Choi , Youn-Kyung Baek , Jung-Goo Lee , Yang-Do Kim , Young-Kuk Kim
M-type strontium hexaferrite (SrM) nanoparticles were synthesized via a citric acid-modified coprecipitation route with a significantly reduced citric acid (CA) amount to remove pre-calcination heat treatment for minimizing carbon residue interference. By using a significantly reduced amount of citric acid ([CA]/[Sr] = 1) compared to the conventional route ([CA]/([Sr]+[Fe]) = 1), a pure SrM phase without non-magnetic impurities was successfully synthesized through a single calcination of the precursor precipitates. The study analyzed the impact of alkalis (LiOH, KOH, and NaOH) on phase formation of SrM. We found that various oxides including SrM, α-Fe2O3, γ-Fe2O3, SrCO3 were stabilized with strong dependence on the choice of alkali solution. A mixed alkali method combining NaOH and KOH aqueous solutions was developed to optimize precursor precipitation. Calcination at lower temperature (<600 °C) initially formed the intermediate γ-Fe2O3, which fully converted to SrM at higher temperature (≥700 °C). Calcination at 800 °C yielded highly crystalline, phase-pure SrM nanocrystals with excellent magnetic properties. This improvement is attributed to the grain growth and enhanced domain pinning. The prepared SrM nanoparticles were subsequently sintered, and their magnetization curves were analyzed using a phenomenological model. This analysis revealed that domain pinning plays a crucial role in their improved coercivity compared to that of the conventional solid-state processed bulk ceramic.
{"title":"Alkali ion effects in modified citrate co-precipitation of strontium hexaferrite nanoparticles using a highly reduced citric acid ratio","authors":"Jae-Young Choi , Youn-Kyung Baek , Jung-Goo Lee , Yang-Do Kim , Young-Kuk Kim","doi":"10.1016/j.matchemphys.2025.132006","DOIUrl":"10.1016/j.matchemphys.2025.132006","url":null,"abstract":"<div><div>M-type strontium hexaferrite (SrM) nanoparticles were synthesized via a citric acid-modified coprecipitation route with a significantly reduced citric acid (CA) amount to remove pre-calcination heat treatment for minimizing carbon residue interference. By using a significantly reduced amount of citric acid ([CA]/[Sr] = 1) compared to the conventional route ([CA]/([Sr]+[Fe]) = 1), a pure SrM phase without non-magnetic impurities was successfully synthesized through a single calcination of the precursor precipitates. The study analyzed the impact of alkalis (LiOH, KOH, and NaOH) on phase formation of SrM. We found that various oxides including SrM, α-Fe<sub>2</sub>O<sub>3</sub>, γ-Fe<sub>2</sub>O<sub>3</sub>, SrCO<sub>3</sub> were stabilized with strong dependence on the choice of alkali solution. A mixed alkali method combining NaOH and KOH aqueous solutions was developed to optimize precursor precipitation. Calcination at lower temperature (<600 °C) initially formed the intermediate γ-Fe<sub>2</sub>O<sub>3</sub>, which fully converted to SrM at higher temperature (≥700 °C). Calcination at 800 °C yielded highly crystalline, phase-pure SrM nanocrystals with excellent magnetic properties. This improvement is attributed to the grain growth and enhanced domain pinning. The prepared SrM nanoparticles were subsequently sintered, and their magnetization curves were analyzed using a phenomenological model. This analysis revealed that domain pinning plays a crucial role in their improved coercivity compared to that of the conventional solid-state processed bulk ceramic.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"352 ","pages":"Article 132006"},"PeriodicalIF":4.7,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-30DOI: 10.1016/j.matchemphys.2025.132002
Yanjun Zhao , Ziyan Liu , Mao Peng , Nengwen Li , Zengxin Deng , Hongzhuo Dai , Hanping Pang , Li Wei
High-Mg content Al–Mg–Mn alloys face challenges in cold deformation due to excessive flow stress. This research examines how adding 0.4 wt% Gd and 0.1 wt% Y affects the hot compression behavior of an Al-9.7Mg-0.4Mn alloy. Key findings reveal that uniformly dispersed nanoscale Mn2Gd precipitates significantly elevate peak flow stress by ∼70 MPa (at 320 °C/0.1 s−1) and refine dynamic recrystallization (DRX) grains. These nanophases and coarse phases (AlMg(Gd,Y), Al8Mn4(Gd,Y)) can trigger three competing DRX mechanisms by impeding dislocation motion and increasing strain storage energy: Continuous DRX (CDRX) at grain boundaries via progressive subgrain rotation; Discontinuous DRX (DDRX) through grain boundary bulging and nucleation; Particle-stimulated nucleation (PSN) around coarse phases (>1 μm). This research provides theoretical insights for enhancing thermo-mechanical treatment of rare-earth-modified high-Mg content Al–Mg alloys, demonstrating that Gd/Y co-addition enables superior microstructural control. The refined DRX grains (minimum size 3.2 μm) and the developed constitutive model offer clear guidance for optimizing hot forging of rare-earth modified Al–Mg alloys used in lightweight automotive parts.
{"title":"Synergistic effect of Gd/Y microalloying on dynamic recrystallization and hot deformation behavior of high-Mg content Al-9.7Mg-0.4Mn alloy","authors":"Yanjun Zhao , Ziyan Liu , Mao Peng , Nengwen Li , Zengxin Deng , Hongzhuo Dai , Hanping Pang , Li Wei","doi":"10.1016/j.matchemphys.2025.132002","DOIUrl":"10.1016/j.matchemphys.2025.132002","url":null,"abstract":"<div><div>High-Mg content Al–Mg–Mn alloys face challenges in cold deformation due to excessive flow stress. This research examines how adding 0.4 wt% Gd and 0.1 wt% Y affects the hot compression behavior of an Al-9.7Mg-0.4Mn alloy. Key findings reveal that uniformly dispersed nanoscale Mn<sub>2</sub>Gd precipitates significantly elevate peak flow stress by ∼70 MPa (at 320 °C/0.1 s<sup>−1</sup>) and refine dynamic recrystallization (DRX) grains. These nanophases and coarse phases (AlMg(Gd,Y), Al<sub>8</sub>Mn<sub>4</sub>(Gd,Y)) can trigger three competing DRX mechanisms by impeding dislocation motion and increasing strain storage energy: Continuous DRX (CDRX) at grain boundaries via progressive subgrain rotation; Discontinuous DRX (DDRX) through grain boundary bulging and nucleation; Particle-stimulated nucleation (PSN) around coarse phases (>1 μm). This research provides theoretical insights for enhancing thermo-mechanical treatment of rare-earth-modified high-Mg content Al–Mg alloys, demonstrating that Gd/Y co-addition enables superior microstructural control. The refined DRX grains (minimum size 3.2 μm) and the developed constitutive model offer clear guidance for optimizing hot forging of rare-earth modified Al–Mg alloys used in lightweight automotive parts.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 132002"},"PeriodicalIF":4.7,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-29DOI: 10.1016/j.matchemphys.2025.131996
Esakkimuthu Shanmugasundaram , Gunasekar Vijay , Shen Ming Chen , Esakkiraju Shanmugasundaram , Z. Mohamed Riyas , Mohd Shkir , I.M. Ashraf , M. Ehthishamul Haque , S.A. Martin Britto Dhas
The impact of acoustic shock wave treatment on the structural and electrochemical properties of polyaniline (PANI) was systematically investigated for asymmetric supercapacitor applications. PANI was synthesized via chemical oxidative polymerization using ammonium persulfate as an oxidant and exposed to dynamic shock loading of 100, 200, and 300 shocks, designated as PANI-100, PANI-200, and PANI-300, respectively. The high-pressure acoustic pulses generated during the process induced localized compression and chain alignment, resulting in a partial amorphous-to-crystalline phase transition confirmed by XRD and SEM analyses. Such structural reordering enhances π–π conjugation and charge carrier mobility, improving electron–ion transport at the electrode–electrolyte interface. Electrochemical measurements (CV, EIS, and GCD) revealed that PANI-300 achieved a specific capacitance of 317 F g−1 at 1 A g−1, attributed to reduced charge-transfer resistance and improved interfacial polarization. The asymmetric device (AC/PVA–H2SO4/PANI-300) exhibited a specific capacitance is 96 F g−1 at 1 A g−1, energy density is 43.2 Wh kg−1 and power density is 893 W kg−1, and retained 88 % of its capacitance after 10,000 cycles. The findings demonstrate that shock-induced lattice strain and molecular reorientation play a crucial role in enhancing the electrochemical performance of PANI, offering a viable route toward high-performance energy storage systems.
系统研究了声冲击波处理对非对称超级电容器中聚苯胺（PANI）结构和电化学性能的影响。以过硫酸铵为氧化剂，通过化学氧化聚合法制备聚苯胺，并对聚苯胺进行了100、200和300次冲击，分别命名为聚苯胺-100、聚苯胺-200和聚苯胺-300。在此过程中产生的高压声脉冲引起了局部压缩和链排列，导致了部分非晶到晶的相变，XRD和SEM分析证实了这一点。这种结构重排序增强了π -π共轭和电荷载流子迁移率，改善了电极-电解质界面的电子-离子输运。电化学测量（CV， EIS和GCD）表明，PANI-300在1 a g−1时的比电容为317 F g−1，这是由于降低了电荷转移电阻和改善了界面极化。该非对称器件（AC/ PVA-H2SO4 /PANI-300）在1 a g−1时的比电容为96 F g−1，能量密度为43.2 Wh kg−1，功率密度为893 W kg−1，在10,000次循环后保持了88%的电容。研究结果表明，冲击诱导的晶格应变和分子重定向对提高聚苯胺的电化学性能起着至关重要的作用，为高性能储能系统的发展提供了一条可行的途径。
{"title":"Exploration of acoustic Shockwave-driven structural reordering and lattice dynamics in polyaniline (PANI) for enhanced electrode behaviour in asymmetric supercapacitors","authors":"Esakkimuthu Shanmugasundaram , Gunasekar Vijay , Shen Ming Chen , Esakkiraju Shanmugasundaram , Z. Mohamed Riyas , Mohd Shkir , I.M. Ashraf , M. Ehthishamul Haque , S.A. Martin Britto Dhas","doi":"10.1016/j.matchemphys.2025.131996","DOIUrl":"10.1016/j.matchemphys.2025.131996","url":null,"abstract":"<div><div>The impact of acoustic shock wave treatment on the structural and electrochemical properties of polyaniline (PANI) was systematically investigated for asymmetric supercapacitor applications. PANI was synthesized via chemical oxidative polymerization using ammonium persulfate as an oxidant and exposed to dynamic shock loading of 100, 200, and 300 shocks, designated as PANI-100, PANI-200, and PANI-300, respectively. The high-pressure acoustic pulses generated during the process induced localized compression and chain alignment, resulting in a partial amorphous-to-crystalline phase transition confirmed by XRD and SEM analyses. Such structural reordering enhances π–π conjugation and charge carrier mobility, improving electron–ion transport at the electrode–electrolyte interface. Electrochemical measurements (CV, EIS, and GCD) revealed that PANI-300 achieved a specific capacitance of 317 F g<sup>−1</sup> at 1 A g<sup>−1</sup><strong>,</strong> attributed to reduced charge-transfer resistance and improved interfacial polarization. The asymmetric device (AC/PVA–H<sub>2</sub>SO<sub>4</sub>/PANI-300) exhibited a specific capacitance is 96 F g<sup>−1</sup> at 1 A g<sup>−1</sup><strong>,</strong> energy density is 43.2 Wh kg<sup>−1</sup> and power density is 893 W kg<sup>−1</sup>, and retained 88 % of its capacitance after 10,000 cycles. The findings demonstrate that shock-induced lattice strain and molecular reorientation play a crucial role in enhancing the electrochemical performance of PANI, offering a viable route toward high-performance energy storage systems<strong>.</strong></div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 131996"},"PeriodicalIF":4.7,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-29DOI: 10.1016/j.matchemphys.2025.131997
Rupesh S. Pedanekar , Aasiya S. Jamadar , Umme Javeria , Hieu Nguyen Chi , Seong Jun Yun , Sang Chul Lee , Sung Jin Kim
The role of hydrogen charging current density in controlling hydrogen uptake and subsequent corrosion behavior of high-Mn steels was systematically investigated. Unlike the widely studied body-centered cubic (BCC)-structured steels, this work focused on face-centered cubic (FCC)-based high-Mn steel, where hydrogen absorption, trap saturation, and subsequent effusion critically affect corrosion behavior by destabilizing surface corrosion products through defect formation. Optical microscopy (OM), electron backscatter diffraction (EBSD), electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), Mott-Schottky (MS) analysis, and cyclic voltammetry (CV) were employed. The results reveal that hydrogen uptake efficiency does not increase monotonically with charging current density. At low current densities (5–50 mA/cm2), limited fugacity restricted hydrogen absorption in FCC matrix, whereas at very high current densities (>150 mA/cm2), excessive bubble formation and surface damage reduced the effective uptake. In contrast, an intermediate current density of 100 mA/cm2 promoted hydrogen absorption, comparatively mild corrosion, and trap saturation, leading to sustained hydrogen effusion, elevated defect densities within the surface oxide scale (Cr-substituted Fe oxides), and a pronounced reduction in charge transfer resistance. MS and CV analyses further indicated that pre-absorbed and desorbed hydrogen-induced defect formation and enhanced oxide conductivity, while anodic dissolution remained the dominant surface process. These findings highlight the critical importance of optimizing electrochemical charging conditions to reliably assess hydrogen-induced corrosion degradation in Cr-bearing high-Mn steels.
{"title":"Optimizing electrochemical hydrogen charging conditions for assessing hydrogen-induced corrosion degradation in Cr-bearing high-Mn austenitic steels","authors":"Rupesh S. Pedanekar , Aasiya S. Jamadar , Umme Javeria , Hieu Nguyen Chi , Seong Jun Yun , Sang Chul Lee , Sung Jin Kim","doi":"10.1016/j.matchemphys.2025.131997","DOIUrl":"10.1016/j.matchemphys.2025.131997","url":null,"abstract":"<div><div>The role of hydrogen charging current density in controlling hydrogen uptake and subsequent corrosion behavior of high-Mn steels was systematically investigated. Unlike the widely studied body-centered cubic (BCC)-structured steels, this work focused on face-centered cubic (FCC)-based high-Mn steel, where hydrogen absorption, trap saturation, and subsequent effusion critically affect corrosion behavior by destabilizing surface corrosion products through defect formation. Optical microscopy (OM), electron backscatter diffraction (EBSD), electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), Mott-Schottky (MS) analysis, and cyclic voltammetry (CV) were employed. The results reveal that hydrogen uptake efficiency does not increase monotonically with charging current density. At low current densities (5–50 mA/cm<sup>2</sup>), limited fugacity restricted hydrogen absorption in FCC matrix, whereas at very high current densities (>150 mA/cm<sup>2</sup>), excessive bubble formation and surface damage reduced the effective uptake. In contrast, an intermediate current density of 100 mA/cm<sup>2</sup> promoted hydrogen absorption, comparatively mild corrosion, and trap saturation, leading to sustained hydrogen effusion, elevated defect densities within the surface oxide scale (Cr-substituted Fe oxides), and a pronounced reduction in charge transfer resistance. MS and CV analyses further indicated that pre-absorbed and desorbed hydrogen-induced defect formation and enhanced oxide conductivity, while anodic dissolution remained the dominant surface process. These findings highlight the critical importance of optimizing electrochemical charging conditions to reliably assess hydrogen-induced corrosion degradation in Cr-bearing high-Mn steels.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 131997"},"PeriodicalIF":4.7,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-29DOI: 10.1016/j.matchemphys.2025.131995
Athar Heydari, Soheila Ghasemi
Ionic liquids (ILs) are widely recognized as effective catalysts for the production of cyclic carbonates from CO2 and oxiranes. In this study, a magnetic polyvinylpyridine-based acidic IL catalyst (Fe3O4@Si@PVPBr–COOH) was synthesized under mild and environmentally friendly conditions, without the use of solvents or co-catalysts. The catalyst was comprehensively characterized using a variety of analytical methods, including FT-IR, VSM, XRD, SEM, TGA, EDX, and DLS. The resulting heterogeneous catalyst demonstrated outstanding activity in synthesizing five-membered cyclic carbonates from a broad range of epoxides—including aromatic, linear, and cyclic aliphatic—achieving high to quantitative yields with excellent selectivity. Furthermore, the reaction proceeded with exclusive formation of cyclic carbonates, with no detectable diol byproducts. Notably, the catalyst retained its catalytic efficiency after five consecutive cycles. Additional advantages include its facile magnetic separation using an external magnet.
{"title":"Grafting of Carboxylated polyvinylpyridine onto Fe3O4@Si for catalytic cycloaddition of CO2 to epoxides under solvent-free conditions","authors":"Athar Heydari, Soheila Ghasemi","doi":"10.1016/j.matchemphys.2025.131995","DOIUrl":"10.1016/j.matchemphys.2025.131995","url":null,"abstract":"<div><div>Ionic liquids (ILs) are widely recognized as effective catalysts for the production of cyclic carbonates from CO<sub>2</sub> and oxiranes. In this study, a magnetic polyvinylpyridine-based acidic IL catalyst (Fe<sub>3</sub>O<sub>4</sub>@Si@PVPBr–COOH) was synthesized under mild and environmentally friendly conditions, without the use of solvents or co-catalysts. The catalyst was comprehensively characterized using a variety of analytical methods, including FT-IR, VSM, XRD, SEM, TGA, EDX, and DLS. The resulting heterogeneous catalyst demonstrated outstanding activity in synthesizing five-membered cyclic carbonates from a broad range of epoxides—including aromatic, linear, and cyclic aliphatic—achieving high to quantitative yields with excellent selectivity. Furthermore, the reaction proceeded with exclusive formation of cyclic carbonates, with no detectable diol byproducts. Notably, the catalyst retained its catalytic efficiency after five consecutive cycles. Additional advantages include its facile magnetic separation using an external magnet.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 131995"},"PeriodicalIF":4.7,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-29DOI: 10.1016/j.matchemphys.2025.131999
Jie Luo , Sadok Mehrez , T. Satish Kumar , Mohamad Reda A. Refaai
The surface composites of AA2024-T3 aluminum alloy were produced using friction stir processing (FSP), incorporating Yttria-Stabilized Zirconia (YSZ) particles, commercially known as Metco 204NS as reinforcement. The high hardness and thermal stability of YSZ enhanced the load-bearing capacity and tribological resistance of the composites. The tool pin configuration played a decisive role: using a protruding cylindrical pin (PCP) led to more uniform particle dissemination and reduced the mean grain size from ∼6.87 μm to ∼ 4.12 μm compared with a conventional cylindrical pin (CCP). The PCP-processed composites exhibited significant enhancements, including an ∼20 % increase in hardness (from 109 to 131 HV), a ∼27 % improvement in shear strength (from ∼145 to ∼186 MPa), and an ∼18 % reduction in wear rate (from 0.45 to 0.38 mm3/N·m) than CCP-processed composites. These improvements are attributed to the combined effects of reinforcement characteristics, refined microstructure, and stable tribolayer formation. The results highlight that the synergy between tool design and reinforcement addition is critical for tailoring high-performance aluminum matrix composites.
{"title":"Improving the mechanical and tribological properties of AA2024/YSZ composites through tool design in friction stir processing","authors":"Jie Luo , Sadok Mehrez , T. Satish Kumar , Mohamad Reda A. Refaai","doi":"10.1016/j.matchemphys.2025.131999","DOIUrl":"10.1016/j.matchemphys.2025.131999","url":null,"abstract":"<div><div>The surface composites of AA2024-T3 aluminum alloy were produced using friction stir processing (FSP), incorporating Yttria-Stabilized Zirconia (YSZ) particles, commercially known as Metco 204NS as reinforcement. The high hardness and thermal stability of YSZ enhanced the load-bearing capacity and tribological resistance of the composites. The tool pin configuration played a decisive role: using a protruding cylindrical pin (PCP) led to more uniform particle dissemination and reduced the mean grain size from ∼6.87 μm to ∼ 4.12 μm compared with a conventional cylindrical pin (CCP). The PCP-processed composites exhibited significant enhancements, including an ∼20 % increase in hardness (from 109 to 131 HV), a ∼27 % improvement in shear strength (from ∼145 to ∼186 MPa), and an ∼18 % reduction in wear rate (from 0.45 to 0.38 mm<sup>3</sup>/N·m) than CCP-processed composites. These improvements are attributed to the combined effects of reinforcement characteristics, refined microstructure, and stable tribolayer formation. The results highlight that the synergy between tool design and reinforcement addition is critical for tailoring high-performance aluminum matrix composites.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 131999"},"PeriodicalIF":4.7,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
High entropy alloys attracted attention owing to enhanced microstructural, mechanical and corrosion properties. In this study, AlCuMgMnZn alloys were produced by the hot pressing at various temperatures and duration. Microstructure, wear and corrosion properties of the produced alloys were investigated. The samples were produced at 500 °C, 550 °C, and 600 °C for 30 min and 60 min. The samples consisted of copper based matrix, intermetallics and complex phases such as MgZn2, Mg2Zn11, MgCuZn, and AlCuMg. As the production temperature increased, complex intermetallic phases as well as the manganese based phase were formed. The wear rate decreased from 8.745·10−5 mm3/Nm to 7.785·10−5 mm3/Nm via hot pressing process at 600 °C for 60 min. The formation of the manganese based phases and intermetallic structures improved wear behavior of the AlCuMgMnZn high entropy alloy. The samples produced at 600 °C exhibited significantly improved corrosion behavior. This phenomenon was attributed to microstructural transformations and the formation of a denser, less porous structure. As a result, the samples produced at high hot pressing temperatures exhibited significantly improved properties in terms of both corrosion and wear resistance.
{"title":"Production and characterization of AlCuMgMnZn high entropy alloy prepared by hot pressing","authors":"Raşit Sezer , Mahmut Erol , Yahya Bayrak , Alptekin Kısasöz","doi":"10.1016/j.matchemphys.2025.131994","DOIUrl":"10.1016/j.matchemphys.2025.131994","url":null,"abstract":"<div><div>High entropy alloys attracted attention owing to enhanced microstructural, mechanical and corrosion properties. In this study, AlCuMgMnZn alloys were produced by the hot pressing at various temperatures and duration. Microstructure, wear and corrosion properties of the produced alloys were investigated. The samples were produced at 500 °C, 550 °C, and 600 °C for 30 min and 60 min. The samples consisted of copper based matrix, intermetallics and complex phases such as MgZn<sub>2</sub>, Mg<sub>2</sub>Zn<sub>11</sub>, MgCuZn, and AlCuMg. As the production temperature increased, complex intermetallic phases as well as the manganese based phase were formed. The wear rate decreased from 8.745·10<sup>−5</sup> mm<sup>3</sup>/Nm to 7.785·10<sup>−5</sup> mm<sup>3</sup>/Nm via hot pressing process at 600 °C for 60 min. The formation of the manganese based phases and intermetallic structures improved wear behavior of the AlCuMgMnZn high entropy alloy. The samples produced at 600 °C exhibited significantly improved corrosion behavior. This phenomenon was attributed to microstructural transformations and the formation of a denser, less porous structure. As a result, the samples produced at high hot pressing temperatures exhibited significantly improved properties in terms of both corrosion and wear resistance.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 131994"},"PeriodicalIF":4.7,"publicationDate":"2025-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-27DOI: 10.1016/j.matchemphys.2025.131935
Xin-Yu Jiang , Ta Cong Khiem , Dang Vu Bich Hanh , Fei-Yee Yeoh , Suresh Ghotekar , Wei-Hsin Chen , Kun-Yi Andrew Lin , Shaoping Tong
The design of structurally advanced and compositionally tunable cobalt-based catalysts holds great promise for enhancing heterogeneous oxidation processes. Nevertheless, typical CoxOy often suffers from limited sites, poor porosity, as well as insufficient redox flexibility, restricting their catalytic efficiency. This study addresses the need for an improved catalyst design by developing a novel fluffy yolk–shell cobalt–carbon composite (FYSC) for efficient Oxone activation.
FYSC was synthesized via a simple solvent-assisted hydrothermal–carbonization strategy, using cobalt glycerate microspheres as a hard template and N-methyl-2-pyrrolidone (NMP) as a surface-modifying medium. The structural and chemical features of FYSC were systematically characterized by SEM/TEM, XRD, H2-TPR, UV–vis DRS, BET, XPS, Raman, and electrochemical analyses. The activity of FYSC was investigated by monitoring the decomposition of an emerging contaminant, phenyl-benzimidazole-sulfonic acid (PSA) using Oxone, and comparative studies using commercial Co3O4 as a benchmark.
FYSC exhibited a hierarchically porous structure with 383 m2/g and 0.958 cm3/g, a favorable Co2+/Co3+ ratio, abundant oxygen vacancies, and a lower Co–O bond force constant compared to Co3O4. These features enabled FYSC to achieve over threefold higher PSA degradation rates than Co3O4 and maintain excellent performance across varying pH, temperature, and ionic strength conditions. Mechanistic studies confirmed the generation of both SO4•- and •OH radicals as key reactive species. FYSC also retained over 90 % of its catalytic activity after five cycles, demonstrating exceptional stability and reusability for advanced oxidation applications.
{"title":"Engineering a porous fluffy yolk–shell cobalt–carbon composite via solvent-assisted transformation for advanced oxidative catalysis","authors":"Xin-Yu Jiang , Ta Cong Khiem , Dang Vu Bich Hanh , Fei-Yee Yeoh , Suresh Ghotekar , Wei-Hsin Chen , Kun-Yi Andrew Lin , Shaoping Tong","doi":"10.1016/j.matchemphys.2025.131935","DOIUrl":"10.1016/j.matchemphys.2025.131935","url":null,"abstract":"<div><div>The design of structurally advanced and compositionally tunable cobalt-based catalysts holds great promise for enhancing heterogeneous oxidation processes. Nevertheless, typical Co<sub>x</sub>O<sub>y</sub> often suffers from limited sites, poor porosity, as well as insufficient redox flexibility, restricting their catalytic efficiency. This study addresses the need for an improved catalyst design by developing a novel fluffy yolk–shell cobalt–carbon composite (FYSC) for efficient Oxone activation.</div><div>FYSC was synthesized via a simple solvent-assisted hydrothermal–carbonization strategy, using cobalt glycerate microspheres as a hard template and N-methyl-2-pyrrolidone (NMP) as a surface-modifying medium. The structural and chemical features of FYSC were systematically characterized by SEM/TEM, XRD, H<sub>2</sub>-TPR, UV–vis DRS, BET, XPS, Raman, and electrochemical analyses. The activity of FYSC was investigated by monitoring the decomposition of an emerging contaminant, phenyl-benzimidazole-sulfonic acid (PSA) using Oxone, and comparative studies using commercial Co<sub>3</sub>O<sub>4</sub> as a benchmark.</div><div>FYSC exhibited a hierarchically porous structure with 383 m<sup>2</sup>/g and 0.958 cm<sup>3</sup>/g, a favorable Co<sup>2+</sup>/Co<sup>3+</sup> ratio, abundant oxygen vacancies, and a lower Co–O bond force constant compared to Co<sub>3</sub>O<sub>4</sub>. These features enabled FYSC to achieve over threefold higher PSA degradation rates than Co<sub>3</sub>O<sub>4</sub> and maintain excellent performance across varying pH, temperature, and ionic strength conditions. Mechanistic studies confirmed the generation of both SO<sub>4</sub><sup>•-</sup> and <sup>•</sup>OH radicals as key reactive species. FYSC also retained over 90 % of its catalytic activity after five cycles, demonstrating exceptional stability and reusability for advanced oxidation applications.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 131935"},"PeriodicalIF":4.7,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145842515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-26DOI: 10.1016/j.matchemphys.2025.131992
Ali S. Razzaq , Zainab J. Khudair , Sahar I. Naji , Ahmed A. Hadi , Talib M. Albayati , Nisreen S. Ali , Narges Elmi Fard
This study presents a novel nanocomposite hydrogel hybrid adsorbent composed of chitosan (CH), acrylic acid (AA), salicylic acid (SA), and single-walled carbon nanotubes (SWCNTs) for the efficient removal of methyl violet (MV) dye from aqueous solutions. The nanocomposite hydrogel hybrid adsorbent (SWCNTs-g-CH/AA/SA) was synthesized via free radical polymerization techniques. Various characterization methods, including FTIR, XRD, FESEM, TGA, and BET analyses, were employed. The effects of key operational parameters—such as adsorbent dosage, initial dye concentration, contact time, pH, and temperature—were systematically investigated. The SWCNTs-g-CH/AA/SA exhibited an outstanding dye removal efficiency of 99.9 % at an adsorbent dosage of 0.05 g and an equilibrium contact time of 30 min. Kinetic studies revealed that the adsorption process follows a Blanchard model, indicating rapid adsorption with strong interactions at the adsorbent surface. Three-parameter models, especially Radke-Prausnitz with R2 = 0.999 and Qmax = 76.39 mg/g, provided the best description of the experimental data and revealed the heterogeneous surfaces of the composite due to the distribution of SWCNTs in the hydrogel. Thermodynamic analyses confirmed the endothermic and spontaneous nature of the adsorption process, with a significant enthalpy change (ΔH° = +76.9 kJ/mol). Despite the low Temkin binding energy (BT = 4.75 kJ/mol), the overall findings suggest a hybrid adsorption mechanism primarily governed by physical interactions—such as π–π stacking and electrostatic forces—further enhanced by localized chemisorption at high-energy sites. These results highlight the remarkable potential of the SWCNT-g-CH/AA/SA hydrogel nanocomposite as a multifunctional and eco-friendly adsorbent for the remediation of dye-contaminated wastewater.
{"title":"Chitosan-grafted single-wall carbon nanotube/hydrogel composites for adsorptive dye removal","authors":"Ali S. Razzaq , Zainab J. Khudair , Sahar I. Naji , Ahmed A. Hadi , Talib M. Albayati , Nisreen S. Ali , Narges Elmi Fard","doi":"10.1016/j.matchemphys.2025.131992","DOIUrl":"10.1016/j.matchemphys.2025.131992","url":null,"abstract":"<div><div>This study presents a novel nanocomposite hydrogel hybrid adsorbent composed of chitosan (CH), acrylic acid (AA), salicylic acid (SA), and single-walled carbon nanotubes (SWCNTs) for the efficient removal of methyl violet (MV) dye from aqueous solutions. The nanocomposite hydrogel hybrid adsorbent (SWCNTs-g-CH/AA/SA) was synthesized via free radical polymerization techniques. Various characterization methods, including FTIR, XRD, FESEM, TGA, and BET analyses, were employed. The effects of key operational parameters—such as adsorbent dosage, initial dye concentration, contact time, pH, and temperature—were systematically investigated. The SWCNTs-g-CH/AA/SA exhibited an outstanding dye removal efficiency of 99.9 % at an adsorbent dosage of 0.05 g and an equilibrium contact time of 30 min. Kinetic studies revealed that the adsorption process follows a Blanchard model, indicating rapid adsorption with strong interactions at the adsorbent surface. Three-parameter models, especially Radke-Prausnitz with R<sup>2</sup> = 0.999 and Q<sub>max</sub> = 76.39 mg/g, provided the best description of the experimental data and revealed the heterogeneous surfaces of the composite due to the distribution of SWCNTs in the hydrogel. Thermodynamic analyses confirmed the endothermic and spontaneous nature of the adsorption process, with a significant enthalpy change (ΔH° = +76.9 kJ/mol). Despite the low Temkin binding energy (BT = 4.75 kJ/mol), the overall findings suggest a hybrid adsorption mechanism primarily governed by physical interactions—such as π–π stacking and electrostatic forces—further enhanced by localized chemisorption at high-energy sites. These results highlight the remarkable potential of the SWCNT-g-CH/AA/SA hydrogel nanocomposite as a multifunctional and eco-friendly adsorbent for the remediation of dye-contaminated wastewater.</div></div>","PeriodicalId":18227,"journal":{"name":"Materials Chemistry and Physics","volume":"351 ","pages":"Article 131992"},"PeriodicalIF":4.7,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号