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Enhanced electrochemical performance and internal resistance dynamics of Zn-MOF-74/rGO composite cathode for aqueous zinc-ion batteries 锌- mof -74/氧化石墨烯复合阴极的电化学性能和内阻动力学研究
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-29 DOI: 10.1016/j.diamond.2026.113380
Abdulhadi H. Al-Marri
The development of high-performance aqueous zinc-ion batteries (AZIBs) requires cathode materials capable of combining fast Zn2+ transport, high electronic conductivity, and long-term structural stability. In this work, we report a Zn-MOF-74/rGO composite synthesized through a facile in-situ hydrothermal route, in which reduced graphene oxide (rGO) forms a conductive and mechanically robust framework within the MOF matrix. Structural analyses confirm that the incorporation of rGO preserves the crystalline integrity of the MOF-74 framework while significantly improving its textural properties and thermal stability. The resulting hybrid exhibits a high specific surface area (≈950 m2 g−1) and a hierarchical porous network that facilitates rapid Zn2+ diffusion. Electrochemical measurements reveal a remarkable enhancement in charge-storage performance: the composite delivers 291 mAh g−1, superior rate capability, and excellent cycling stability with 94% capacity retention after 1000 cycles at 2.0 A g−1. Dynamic charge internal resistance (DCIR) analysis further demonstrates reduced polarization and improved interfacial kinetics, confirming the key role of rGO in lowering internal resistance under various operating conditions. The synergistic interplay between the MOF-74 framework and the rGO network enables fast electrochemical kinetics, enhanced electronic pathways, and robust structural durability. This study provides new insights into DCIR evolution in MOF-based electrodes and highlights a promising strategy for designing next-generation high-power AZIBs.
高性能水性锌离子电池(azib)的发展需要能够结合Zn2+快速输运、高电子导电性和长期结构稳定性的正极材料。在这项工作中,我们报道了一种通过简单的原位水热方法合成的Zn-MOF-74/rGO复合材料,其中还原的氧化石墨烯(rGO)在MOF基体内形成导电且机械坚固的框架。结构分析证实,rGO的加入保留了MOF-74框架的结晶完整性,同时显著改善了其结构性能和热稳定性。所得到的杂化材料具有高比表面积(≈950 m2 g−1)和分层多孔网络,有利于Zn2+的快速扩散。电化学测量显示电荷存储性能显著增强:复合材料提供291 mAh g - 1,优越的倍率能力和出色的循环稳定性,在2.0 ag - 1下循环1000次后容量保持94%。动态电荷内阻(DCIR)分析进一步证明了极化降低和界面动力学改善,证实了还原氧化石墨烯在各种操作条件下降低内阻的关键作用。MOF-74框架和氧化石墨烯网络之间的协同相互作用可以实现快速的电化学动力学,增强的电子路径和坚固的结构耐久性。该研究为mof电极的DCIR演变提供了新的见解,并强调了设计下一代高功率azib的有前途的策略。
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引用次数: 0
Detection of Escherichia coli using GMR integrated with L-histidine-linked Fe3O4/rGO magnetic nanoparticles 结合l -组氨酸连接Fe3O4/rGO磁性纳米颗粒的GMR检测大肠杆菌
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-31 DOI: 10.1016/j.diamond.2026.113376
Layyinatus Shifa , Zurnansyah , Emi Kurnia Sari , Nurul Imani Istiqomah , Mercuryta Dewi Noviastuti , Nugraheni Puspita Rini , Julia Angel , Tri Marji Atmono , Kohji Nakamura , Edi Suharyadi
Escherichia coli (E. coli) has been successfully detected using a giant magnetoresistance (GMR) chip as a transducer, employed with Fe3O4 and Fe3O4/reduced graphene oxide (rGO) nanoparticles as magnetic nanotag labels and L-Histidine (L-His) as a linker. The E. coli concentration was varied to investigate how different levels of E. coli affect the voltage signal generated by the GMR sensor. The nanoparticles were fabricated through a hybrid approach that employs a green synthesis method using plant extracts. The nanoparticles exhibit superparamagnetic behavior, which influences the detection quality of the labels. The result shows that the higher E. coli concentration results in a more substantial increase in the voltage signal. For the Fe3O4/rGO-His label, the voltage is 0.075, 0.131, and 0.173 V for E. coli variations of 1:1000, 1:100, and 1:10, respectively. The signal for Fe3O4/rGO-His label is more significant than that of Fe3O4-His due to the contribution of rGO which increases the binding of L-His and E. coli. Moreover, the result of the relative standard deviation shows an increase from 0.26% to 6.1% for Fe3O4-His and from 0.69% to 5.1% for Fe3O4/rGO-His, indicating an acceptable level of reproducibility in the sensor's detection.
利用巨磁电阻(GMR)芯片作为传感器,以Fe3O4和Fe3O4/还原氧化石墨烯(rGO)纳米颗粒作为磁性纳米标签,l -组氨酸(L-His)作为连接剂,成功检测出大肠杆菌(E. coli)。改变大肠杆菌浓度,研究不同水平的大肠杆菌如何影响GMR传感器产生的电压信号。纳米颗粒是通过混合方法制造的,该方法采用绿色合成方法,使用植物提取物。纳米粒子表现出超顺磁性,影响了标记的检测质量。结果表明,大肠杆菌浓度越高,电压信号的增加幅度越大。对于Fe3O4/rGO-His标签,大肠杆菌1:1000、1:100和1:10变化的电压分别为0.075、0.131和0.173 V。Fe3O4/rGO- his标记的信号比Fe3O4- his的信号更显著,这是由于rGO的贡献,它增加了L-His与大肠杆菌的结合。此外,相对标准偏差的结果显示,Fe3O4- his从0.26%增加到6.1%,Fe3O4/rGO-His从0.69%增加到5.1%,表明传感器检测的再现性水平可接受。
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引用次数: 0
Design and synthesis of a PtNPs@GQDs nanocomposites and its anticancer effects on colorectal cancer PtNPs@GQDs纳米复合材料的设计与合成及其对结直肠癌的抗癌作用
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-31 DOI: 10.1016/j.diamond.2026.113389
HuiLong Xie , YongQin Wei , JiaNi Xiong , ChengYan Wang , GuoCong Guo , JieMing Xie
Platinum-based chemotherapy for colorectal cancer is limited by severe nephrotoxicity and drug resistance. To address this, we synthesized a novel platinum nanoparticle-graphene quantum dot nanostructure (PtNPs@GQDs), characterized by excellent water solubility, stability, and high catalytic/reductive activity. In vitro, PtNPs@GQDs demonstrated potent growth inhibition of colon cancer cells at low platinum concentrations (<1.6 μg Pt/mL) and significantly induced apoptosis. In vivo, PtNPs@GQDs (8.2 and 12.4 mg Pt/kg) markedly suppressed tumor growth in HT-29 xenograft mice. These findings highlight PtNPs@GQDs as a promising new chemotherapeutic agent for colorectal cancer.
以铂为基础的结直肠癌化疗由于严重的肾毒性和耐药性而受到限制。为了解决这个问题,我们合成了一种新型的铂纳米粒子-石墨烯量子点纳米结构(PtNPs@GQDs),具有优异的水溶性,稳定性和高催化/还原活性。在体外,PtNPs@GQDs在低铂浓度(<1.6 μg Pt/mL)下对结肠癌细胞有明显的生长抑制作用,并显著诱导细胞凋亡。在体内,PtNPs@GQDs(8.2和12.4 mg Pt/kg)显著抑制HT-29异种移植小鼠的肿瘤生长。这些发现突出了PtNPs@GQDs作为一种有前景的结直肠癌新化疗药物。
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引用次数: 0
Citric acid and thiourea functionalized activated carbon for efficient removal of anionic and cationic dyes: A combined experimental and DFT approach 柠檬酸和硫脲功能化活性炭高效去除阴离子和阳离子染料:实验和DFT相结合的方法
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-20 DOI: 10.1016/j.diamond.2026.113353
Hamza Megherbi , Aghilas Brahmi , Faïza Diaba , Abdelbaki Reffas
Activated carbon (AC) is known for its excellent adsorption, which can be improved by surface and inner modification. This study investigates three key points. First, the effect of phosphoric acid impregnation (30, 60, 100, and 150 wt%) on crystallinity, surface chemistry, thermal stability, and adsorption of Methylene blue (MB) and Orange G (OG). TGA, XRD, and FT-IR results showed that phosphoric acid enhanced thermal stability, decreased crystallinity, and increased surface functional groups. These structural and chemical changes led to significant increases in adsorption capacity, from 77.126 to 514.405 mg/g for MB at pH 10 and from 16.813 to 254.900 mg/g for OG at pH 2.
Second, the effect of surface and internal modifications using Citric acid (C-ACs) and Thiourea (T-ACs) on activated carbon, including its elemental composition and morphology, were investigated through FTIR, XPS, and SEM-EDS analyses. The successful introduction of new surface functionalities was confirmed by the emergence of thiocarbonyl (HN–C=S) groups after Thiourea modification and ester (O–C=O) groups following Citric acid treatment. After modification, the adsorption capacity of OG slightly decreased to 239.029 mg/g at pH 2, whereas MB adsorption capacity further increased, reaching 536.600 mg/g at pH 10.
Finally, Density Functional Theory (DFT) and Non-Covalent Interaction (NCI) analyses provided molecular-level insight into the adsorption mechanism, demonstrating that MB exhibits higher reactivity than OG due to its lower energy gap and stronger interactions with electron-rich surface sites. π–π stacking was identified as the dominant interaction, supported by electrostatic forces, hydrogen bonding, and van der Waals interactions.
活性炭(AC)以其优异的吸附性能而闻名,可通过表面和内部改性来改善其吸附性能。本研究调查了三个关键点。首先,磷酸浸渍(30、60、100和150wt %)对亚甲基蓝(MB)和橙G (OG)的结晶度、表面化学、热稳定性和吸附的影响。TGA、XRD和FT-IR结果表明,磷酸增强了材料的热稳定性,降低了结晶度,增加了表面官能团。这些结构和化学变化导致吸附量显著增加,pH值为10时MB的吸附量从77.126 mg/g增加到514.405 mg/g, pH值为2时OG的吸附量从16.813 mg/g增加到254.900 mg/g。其次,通过FTIR、XPS和SEM-EDS分析,研究了柠檬酸(C-ACs)和硫脲(T-ACs)对活性炭表面和内部改性的影响,包括其元素组成和形貌。通过硫脲修饰后的硫羰基(HN-C =S)基团和柠檬酸处理后的酯(O - c =O)基团的出现,证实了新的表面官能团的成功引入。改性后OG的吸附量在pH 2时略有下降,为239.029 mg/g,而MB的吸附量进一步增加,在pH 10时达到536.600 mg/g。最后,密度泛函理论(DFT)和非共价相互作用(NCI)分析提供了分子水平上对吸附机理的深入了解,表明MB比OG具有更高的反应性,因为它具有更低的能隙和更强的与富电子表面位点的相互作用。π -π堆叠被确定为主要相互作用,由静电力、氢键和范德华相互作用支持。
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引用次数: 0
Investigating the ultimate PcV performance of diamond-modified silicon carbide seal rings in high-load, high-speed water environments 研究金刚石改性碳化硅密封圈在高负荷、高速水环境下的PcV性能
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-02-11 DOI: 10.1016/j.diamond.2026.113441
Chengye Yang , Hui Song , He Li , Shihao Yang , Yuanyuan Mu , Wubo Chu , Xinbiao Mao , Nan Jiang , Kazuhito Nishimura
Premature failure of SiC seal rings, manifesting as leakage under high-load, high-speed operation, represents a critical barrier to achieving the ultra-high reliability and extended service life required by advanced sealing systems. To suppress wear-induced failure, this study deposits a conformal microcrystalline diamond (MCD) coating on the sealing-ring end face by hot-filament chemical vapour deposition (HFCVD). Furthermore, a systematic comparative investigation was conducted to elucidate the interfacial frictional behaviour of diamond-modified seal-ring couples relative to the SiC-SiC pairing. Comprehensive tribological assessment reveals that the MCD–MCD sealing couple attains the optimum overall performance when benchmarked against both the SiC–SiC and MCD–SiC configurations. Specifically, the SiC–SiC couple exhibited an ultimate PcV limit of 4.17 MPa·m s−1, a steady-state friction coefficient of 0.138, and a specific wear rate of 1.53 × 10−8 mm3 N−1 m−1. In contrast, the ultimate PcV value of the MCD-SiC seal pair reaches 75.3580 MPa·m s−1, alongside a friction coefficient of 0.013 and a wear rate of 1.22 × 10−8 mm3/(N·m). Notably, the ultimate PcV value of the MCD-MCD seal pair reaches 84.2919 MPa·m s−1, with a friction coefficient as low as 0.003 and a wear rate of 0.55 × 10−8 mm3/(N·m), which is significantly superior to those of the SiC-SiC and MCD-SiC counterparts. Further mechanistic analysis indicates that under high-load and high-rotational-speed conditions, the lubrication state at the frictional interface of the seal rings undergoes dynamic evolution, specifically a continuous transition from hydrodynamic lubrication through boundary lubrication to incipient dry sliding. Specifically, the SiC-SiC mating pair fails rapidly due to high interfacial adhesion; the MCD-SiC pair suffers from severe abrasive wear at the interface; in contrast, the MCD-MCD pair maintains high stability at the frictional interface, retaining low adhesion and minimal interfacial damage under the lubrication effect of the dual‑carbon low-friction interface. In this study, under water lubrication conditions, the MCD-MCD tribopair exhibits a significantly higher ultimate PcV value than the data reported in previous studies. This work is the first to systematically elucidate the lubrication behaviour evolution and failure mechanisms of diamond-coated seal rings under high-load and high-speed water environments. These findings provide critical experimental evidence and theoretical support for the high-performance design of deep-sea mechanical seals.
SiC密封圈过早失效,在高负荷、高速运行下表现为泄漏,是实现先进密封系统所要求的超高可靠性和延长使用寿命的关键障碍。为了抑制磨损失效,本研究采用热丝化学气相沉积(HFCVD)技术在密封环端面沉积一层适形微晶金刚石(MCD)涂层。此外,还进行了系统的比较研究,以阐明金刚石改性密封环对相对于SiC-SiC配对的界面摩擦行为。综合摩擦学评估表明,当与SiC-SiC和MCD-SiC配置进行基准测试时,MCD-MCD密封偶获得了最佳的整体性能。其中,SiC-SiC复合材料的PcV极限为4.17 MPa·m s−1,稳态摩擦系数为0.138,比磨损率为1.53 × 10−8 mm3 N−1 m−1。MCD-SiC密封副的极限PcV值为75.3580 MPa·m s−1,摩擦系数为0.013,磨损率为1.22 × 10−8 mm3/(N·m)。值得注意的是,MCD-MCD密封副的极限PcV值达到84.2919 MPa·m s−1,摩擦系数低至0.003,磨损率为0.55 × 10−8 mm3/(N·m),明显优于SiC-SiC和MCD-SiC密封副。进一步的力学分析表明,在高载荷、高转速工况下,密封环摩擦界面处的润滑状态经历了一个动态演化过程,即从流体动力润滑到边界润滑再到初期干滑动的连续过渡。具体来说,SiC-SiC配合对由于高界面附着力而迅速失效;MCD-SiC副在界面处遭受严重的磨粒磨损;相比之下,MCD-MCD对在双碳低摩擦界面的润滑作用下保持了高的摩擦界面稳定性,保持了低的附着力和最小的界面损伤。在本研究中,在水润滑条件下,MCD-MCD摩擦副的极限PcV值明显高于以往的研究数据。本研究首次系统地阐明了高负荷高速水环境下涂金刚石密封圈的润滑行为演变及失效机理。这些研究结果为深海机械密封的高性能设计提供了重要的实验依据和理论支持。
{"title":"Investigating the ultimate PcV performance of diamond-modified silicon carbide seal rings in high-load, high-speed water environments","authors":"Chengye Yang ,&nbsp;Hui Song ,&nbsp;He Li ,&nbsp;Shihao Yang ,&nbsp;Yuanyuan Mu ,&nbsp;Wubo Chu ,&nbsp;Xinbiao Mao ,&nbsp;Nan Jiang ,&nbsp;Kazuhito Nishimura","doi":"10.1016/j.diamond.2026.113441","DOIUrl":"10.1016/j.diamond.2026.113441","url":null,"abstract":"<div><div>Premature failure of SiC seal rings, manifesting as leakage under high-load, high-speed operation, represents a critical barrier to achieving the ultra-high reliability and extended service life required by advanced sealing systems. To suppress wear-induced failure, this study deposits a conformal microcrystalline diamond (MCD) coating on the sealing-ring end face by hot-filament chemical vapour deposition (HFCVD). Furthermore, a systematic comparative investigation was conducted to elucidate the interfacial frictional behaviour of diamond-modified seal-ring couples relative to the SiC-SiC pairing. Comprehensive tribological assessment reveals that the MCD–MCD sealing couple attains the optimum overall performance when benchmarked against both the SiC–SiC and MCD–SiC configurations. Specifically, the SiC–SiC couple exhibited an ultimate P<sub>c</sub>V limit of 4.17 MPa·m s<sup>−1</sup>, a steady-state friction coefficient of 0.138, and a specific wear rate of 1.53 × 10<sup>−8</sup> mm<sup>3</sup> N<sup>−1</sup> m<sup>−1</sup>. In contrast, the ultimate P<sub>c</sub>V value of the MCD-SiC seal pair reaches 75.3580 MPa·m s<sup>−1</sup>, alongside a friction coefficient of 0.013 and a wear rate of 1.22 × 10<sup>−8</sup> mm<sup>3</sup>/(N·m). Notably, the ultimate P<sub>c</sub>V value of the MCD-MCD seal pair reaches 84.2919 MPa·m s<sup>−1</sup>, with a friction coefficient as low as 0.003 and a wear rate of 0.55 × 10<sup>−8</sup> mm<sup>3</sup>/(N·m), which is significantly superior to those of the SiC-SiC and MCD-SiC counterparts. Further mechanistic analysis indicates that under high-load and high-rotational-speed conditions, the lubrication state at the frictional interface of the seal rings undergoes dynamic evolution, specifically a continuous transition from hydrodynamic lubrication through boundary lubrication to incipient dry sliding. Specifically, the SiC-SiC mating pair fails rapidly due to high interfacial adhesion; the MCD-SiC pair suffers from severe abrasive wear at the interface; in contrast, the MCD-MCD pair maintains high stability at the frictional interface, retaining low adhesion and minimal interfacial damage under the lubrication effect of the dual‑carbon low-friction interface. In this study, under water lubrication conditions, the MCD-MCD tribopair exhibits a significantly higher ultimate P<sub>c</sub>V value than the data reported in previous studies. This work is the first to systematically elucidate the lubrication behaviour evolution and failure mechanisms of diamond-coated seal rings under high-load and high-speed water environments. These findings provide critical experimental evidence and theoretical support for the high-performance design of deep-sea mechanical seals.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"163 ","pages":"Article 113441"},"PeriodicalIF":5.1,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185256","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}
引用次数: 0
Rational design of Ag-CuFe2O4/rGO heterojunction nanocomposite for efficient organic azo-dye degradation and mechanistic pathways toward Environmental Remediation Ag-CuFe2O4/氧化石墨烯异质结纳米复合材料的合理设计及其对有机偶氮染料的高效降解和环境修复的机理途径
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-31 DOI: 10.1016/j.diamond.2026.113386
Sorapong Pavasupree , Paramasivam Shanmugam , Ranjith Rajendran , Lalitha Gnanasekaran , Supakorn Boonyuen , Thammasak Rojviroon , Orawan Rojviroon
The fashion industry today utilizes a wide variety of dyes, raising global concerns about their toxicity, carcinogenic properties, and potential for bioaccumulation. In light of these issues, researchers are increasingly focusing on a diverse range of photocatalysts for the effective remediation of dyes. In this research, the synthesis of Ag-CuFe2O4/rGO nanocomposites is achieved through a hydrothermal method followed by an ultrasonication method. Various analytical techniques were used to analyze the prepared samples, such as XRD, FTIR, SEM, EDS, elemental mapping, HRTEM, and UV–Vis analyses. Results indicated successful decoration of silver nanoparticles (Ag NPs) and CuFe2O4 on 2D reduced graphene oxide (rGO) nanosheets. The fabricated interfacial binary heterostructure demonstrated effective photocatalytic capabilities for the remedy of mixed dye pollutants when exposed to UV–visible light. Factors such as a broad range of light absorption, efficient charge separation, and swift charge transport enhanced the photocatalytic performance of these heterostructures. The optimized Ag-CuFe2O4/rGO nanocomposites achieved impressive degradation efficiencies of 96.27%, 97.27%, and 93.73% for Methylene blue (MB) and Rhodamine B, and MB and RhB mixed dyes, respectively. Additionally, the study explored the tentative photocatalytic mechanism, conducted scavenger experiments, and assessed the recyclability and stability of the nanocomposites. These findings highlighted that hydroxyl radical (OH) species significantly contribute to the photocatalytic degradation process under UV–visible light illumination. Overall, Ag-CuFe2O4/rGO nanocomposites demonstrate strong potential for efficiently degrading organic azo-dyes in industrial wastewater and promoting environmental cleanup.
如今,时尚行业使用了各种各样的染料,引起了全球对其毒性、致癌性和潜在生物积累的关注。鉴于这些问题,研究人员越来越关注各种光催化剂对染料的有效修复。本研究采用水热法制备Ag-CuFe2O4/还原氧化石墨烯纳米复合材料,然后采用超声法制备。采用XRD、FTIR、SEM、EDS、元素映射、HRTEM、UV-Vis等分析技术对制备的样品进行分析。结果表明,银纳米粒子(Ag NPs)和CuFe2O4成功修饰在二维还原氧化石墨烯(rGO)纳米片上。所制备的界面二元异质结构在紫外-可见光照射下对混合染料污染物表现出有效的光催化活性。广泛的光吸收、高效的电荷分离和快速的电荷传输等因素增强了这些异质结构的光催化性能。优化后的Ag-CuFe2O4/rGO纳米复合材料对亚甲基蓝(MB)和罗丹明B、MB和RhB混合染料的降解效率分别为96.27%、97.27%和93.73%。此外,本研究还初步探讨了光催化机理,进行了清除剂实验,并评估了纳米复合材料的可回收性和稳定性。这些发现表明,在紫外-可见光照射下,羟基自由基(•OH)对光催化降解过程有重要作用。总之,Ag-CuFe2O4/还原氧化石墨烯纳米复合材料在有效降解工业废水中的有机偶氮染料和促进环境净化方面具有强大的潜力。
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引用次数: 0
Ultralight and multidimensional chitosan-based aerogel composites with an enhanced microwave absorption performance 具有增强微波吸收性能的超轻和多维壳聚糖基气凝胶复合材料
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-16 DOI: 10.1016/j.diamond.2026.113333
Mahdieh Dehghani-Dashtabi, Hoda Hekmatara, Masoud Mohebbi
Porous polymer aerogels are emerging as the next generation of electromagnetic wave (EMW) absorbers due to their low density, adaptability, environmental friendliness, broad bandwidth and high dielectric loss. In this study, different ratios (35, 50 and 75 wt%) of MoSe₂/MWCNT/MMT nanocomposites which were named as C2-C4 and MWCNT-free was named as C1 were incorporated into the chitosan matrix as filler with different weight ratios to chitosan and the ultralight and multidimensional MoSe₂/MWCNT/MMT-Chitosan aerogels were prepared via freeze-drying. MoSe₂/MWCNT/MMT (50 wt%)-Chitosan (C3) composite was the optimized sample exhibiting the highest reflection loss of −84.40 dB at a thickness of 2.6 mm, with a remarkable bandwidth of 10 GHz covering the entire X and Ku bands. This exceptional performance is attributed to the synergistic effects of various loss mechanisms, including the conduction loss facilitated by Multi-walled carbon nanotube) MWCNT(, the dipole and interfacial polarizations created by MoSe₂ and Montmorillonite) MMT(, and the multiphase activity due to the polygonal porous morphology. Notably, this high microwave absorption efficiency is achieved without magnetic components, offering significant potential for the design of advanced, lightweight, stable, and high-performance microwave absorbers. The radar cross-section (RCS) and far-field measurements demonstrated that coating a perfect electric conductor (PEC) sphere with each composite of C1, C2 and C3 led to a pronounced attenuation effect, achieving reductions of about 30–48 dB in RCS and 18 dB in the scattered far-field intensity.
多孔聚合物气凝胶具有低密度、适应性强、环境友好、宽带宽和高介电损耗等优点,正成为下一代电磁波吸收材料。本研究将不同重量比(35、50、75% wt%)的MoSe₂/MWCNT/MMT纳米复合材料分别命名为C2-C4和无MWCNT命名为C1,作为与壳聚糖重量比不同的填料加入到壳聚糖基体中,通过冷冻干燥法制备了超轻、多层的MoSe₂/MWCNT/MMT-壳聚糖气凝胶。MoSe₂/MWCNT/MMT (50 wt%)-壳聚糖(C3)复合材料在厚度为2.6 mm时的反射损耗最高,为−84.40 dB,具有覆盖整个X和Ku波段的10 GHz带宽。这种优异的性能归因于多种损耗机制的协同作用,包括多壁碳纳米管(MWCNT)导致的传导损耗()、二氧化硅和蒙脱土(MWCNT)产生的偶极子和界面极化(),以及多相多孔形态导致的多相活性。值得注意的是,这种高微波吸收效率是在没有磁性元件的情况下实现的,这为设计先进、轻便、稳定和高性能的微波吸收器提供了巨大的潜力。雷达截面(RCS)和远场测量结果表明,在完美电导体(PEC)球表面涂覆C1、C2和C3的复合材料具有明显的衰减效果,RCS降低约30-48 dB,远场散射强度降低约18 dB。
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引用次数: 0
Iron and cobalt co-doped ZnO nanoparticles grafted over CNTs: An efficient electrochemical probe for the detection of paracetamol 碳纳米管接枝铁钴共掺杂ZnO纳米粒子:一种检测扑热息痛的高效电化学探针
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-26 DOI: 10.1016/j.diamond.2026.113367
Sajid Ali Madni , Abid Ali , Murat Kaleli , Salih Akyürekli , Mashael M. Alharbi , Nadiah Al-Mutlaq , Imene Bayach , Amel Y. Ahmed
Acetaminophen (paracetamol), a widely used analgesic and antipyretic, requires precise and sensitive detection for pharmaceutical and clinical applications. Iron and Cobalt (Fe/Co) co-doped ZnO@CNTs nanocomposites, synthesized via a precipitation method has been developed for the electrochemical detection of acetaminophen. These nanocomposites were doped with equimolar amount of Fe/Co with the concentrations of 1%, 5%, and 10% to optimize the electrocatalytic performance of nanocomposites (ZnO@CNTs). Characterization using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) Energy-Dispersive X-ray Spectroscopy (EDX), and X-ray Diffraction (XRD) and Raman spectroscopy confirmed the successful metallic doping and uniform dispersion within the composite matrix. While, electrochemical studies, including cyclic voltammetry (CV), scan rate analysis, and chronoamperometry, revealed that the 1% doped concentration achieved the lowest limit of detection (LOD), significantly enhancing electron transfer kinetics and sensitivity for acetaminophen detection. 1% Fe/Co doped ZnO@CNT showed lowest LOD of 0.045 μM with high sensitivity of 1.862 μA mM−1 cm−2. The Fe/Co-doped ZnO@CNTs nanocomposites demonstrated outstanding sensitivity, stability, and reproducibility, underscoring their potential for practical acetaminophen analysis.
对乙酰氨基酚(paracetamol)是一种广泛应用的镇痛解热药,在制药和临床应用中需要精确、灵敏的检测方法。采用沉淀法合成了铁和钴(Fe/Co)共掺杂ZnO@CNTs纳米复合材料,用于对乙酰氨基酚的电化学检测。这些纳米复合材料分别以1%、5%和10%的浓度掺杂等摩尔量的Fe/Co以优化纳米复合材料的电催化性能(ZnO@CNTs)。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、能量色散x射线能谱(EDX)、x射线衍射(XRD)和拉曼光谱进行表征,证实了金属在复合基体内的成功掺杂和均匀分散。而电化学研究,包括循环伏安法(CV)、扫描速率分析和计时安培法,表明1%的掺杂浓度达到了最低检测限(LOD),显著提高了对乙酰氨基酚检测的电子转移动力学和灵敏度。掺1% Fe/Co ZnO@CNT的最低LOD为0.045 μM,灵敏度为1.862 μA mM−1 cm−2。Fe/ co掺杂ZnO@CNTs纳米复合材料表现出出色的灵敏度、稳定性和可重复性,强调了它们在实际对乙酰氨基酚分析中的潜力。
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引用次数: 0
A novel fabrication method of small arc-shaped CVD diamond roller wheel using mechanical grinding truing and femtosecond laser sharpening 提出了一种利用机械磨铣和飞秒激光锐化加工小圆弧型CVD金刚石滚轮的新方法
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-26 DOI: 10.1016/j.diamond.2026.113369
Longzhou Dai , Zhengchao wan , Mingjun Zhang , Genyu Chen , Cong Mao , Yuanqiang Luo , Weidong Tang , Bo Cheng
The small arc-shaped CVD diamond roller wheel has broad application prospects in the preparation of micro-structured cutting tools. However, CVD diamond material has good wear resistance, which makes it extremely difficult to dress its small arc-shaped profile. In this work, the oblique line interpolation tangential envelope method is proposed to dress the small arc-shaped CVD diamond roller wheel. This method utilizes the squeezing contact points of two rotating wheels on the dressing path to form the required small arc-shaped profile. This can simultaneously avoid uneven loss of the tool wheel and interference with the installation accuracy of the machine tool, improving the dressing precision of arc-shaped profile. The profile errors caused by different machine tool motion axis are analyzed. The corresponding profile error prediction models have been established. In order to improve the truing accuracy of CVD diamond roller wheel, a segmented arc compensation method is proposed. Finally, femtosecond laser processing technology is used to achieve sharpening of CVD diamond roller wheel. The abrasive particles have a suitable blade height to facilitate the excellent grinding performance of the roller wheel.
小圆弧型CVD金刚石滚轮在微结构刀具的制备中具有广阔的应用前景。然而,CVD金刚石材料具有良好的耐磨性,这使得其小弧形轮廓极难修饰。本文提出了斜插补切包络法对小圆弧型CVD金刚石滚轮进行修整。该方法利用修整路径上两个转轮的挤压接触点形成所需的小弧形轮廓。这样可以同时避免砂轮的不均匀损耗和对机床安装精度的干扰,提高弧形轮廓的修整精度。分析了不同机床运动轴引起的轮廓误差。建立了相应的剖面误差预测模型。为了提高CVD金刚石滚轮的加工精度,提出了一种分段电弧补偿方法。最后,利用飞秒激光加工技术实现了CVD金刚石滚轮的锐化。磨料颗粒具有合适的刃高,有利于滚轮的优异磨削性能。
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引用次数: 0
Multifunctional S–g–C₃N₄/Fe–ZnO photocatalysts for visible-light-induced pollutant degradation and hydrogen evolution S-g-C₃N₄/ Fe-ZnO多功能可见光污染物降解及析氢催化剂
IF 5.1 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.diamond.2026.113354
Chandrakanta Mishra , Swagatika Sahoo , Manamohan Tripathy , Soumyaranjan Senapati , Dayananda Sarangi , Sandip Padhiari
The development of multifunctional photocatalyst capable of simultaneously addressing environmental pollution and clean energy production is of great importance. In this work, sulfur-doped graphitic carbon nitride (S-CN) and Fe-doped ZnO (FZ) were first synthesized individually, followed by the fabrication of a series of S-CN/FZ composites with varying loadings (5, 10, 15, and 20 wt% of FZ). Notably, this designed dual-doped type-II heterojunction integrates photocatalytic oxidation, reduction, and hydrogen evolution within a single visible light responsive system. The structural, morphological, and optical properties of the prepared materials were systematically characterized using XRD, FTIR, XPS, FESEM-EDX, PL, and UV–Vis DRS, PL, and electrochemical analyses, confirming the successful formation of heterojunctions and enhanced visible-light absorption. Among all the composites, S-CN/15FZ exhibited superior photocatalytic activity, achieving rapid reduction of 4-nitrophenol (96.3%) and efficient degradation of tetracycline hydrochloride (94.7%) under visible light irradiation. Furthermore, the optimized heterostructure demonstrated remarkable performance in photocatalytic H₂ evolution (5402.91 μmol g−1 h−1), surpassing that of the pristine components. The enhanced activity is attributed to the synergistic effects of S and Fe dual doping, which are responsible for tailoring the band structure and promoting the charge transfer across the S-CN/FZ interface. This study highlights the potential of S-CN/FZ heterostructures as promising candidates for multifunctional photocatalysis in environmental remediation and sustainable energy applications.
开发能够同时解决环境污染和清洁能源生产的多功能光催化剂具有重要意义。在这项工作中,首先分别合成了硫掺杂石墨氮化碳(S-CN)和铁掺杂ZnO (FZ),然后制作了一系列不同负载(FZ的5、10、15和20 wt%)的S-CN/FZ复合材料。值得注意的是,这种设计的双掺杂ii型异质结在一个单一的可见光响应系统中集成了光催化氧化、还原和析氢。利用XRD、FTIR、XPS、FESEM-EDX、PL、UV-Vis DRS、PL和电化学分析对所制备材料的结构、形貌和光学性质进行了系统表征,证实了异质结的成功形成和可见光吸收的增强。在所有复合材料中,S-CN/15FZ表现出优异的光催化活性,在可见光照射下可快速还原4-硝基苯酚(96.3%),高效降解盐酸四环素(94.7%)。此外,优化后的异质结构在光催化H₂演化方面表现出了显著的性能(5402.91 μmol g−1 H−1),超过了原始组分。活性的增强是由于S和Fe双掺杂的协同作用,它们负责调整能带结构并促进S- cn /FZ界面上的电荷转移。该研究强调了S-CN/FZ异质结构在环境修复和可持续能源应用中的多功能光催化潜力。
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引用次数: 0
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