Diamond and Related Materials最新文献_第2页

Fabrication of green, fluorescent N-doped carbon quantum dots via microwave-assisted method: the effect of microwave power 微波辅助制备绿色荧光n掺杂碳量子点：微波功率的影响

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-20 DOI: 10.1016/j.diamond.2025.112564

Olga K. Mmelesi , Alice Magubane , Souad Ammar , Kebede K. Kefeni , Thabo T.I. Nkambule , Xinying Liu , Alex T. Kuvarega

{"title":"Fabrication of green, fluorescent N-doped carbon quantum dots via microwave-assisted method: the effect of microwave power","authors":"Olga K. Mmelesi , Alice Magubane , Souad Ammar , Kebede K. Kefeni , Thabo T.I. Nkambule , Xinying Liu , Alex T. Kuvarega","doi":"10.1016/j.diamond.2025.112564","DOIUrl":"10.1016/j.diamond.2025.112564","url":null,"abstract":"<div><div>There seem to be fewer research methodically examining the luminous mechanisms of carbon quantum dots (CQDs), despite the general interest in comprehending their features. Preparing N-CQDs with desired optical properties and comprehending the mechanisms underlying photoluminescence (PL) that regulate emission characteristics are the main goals of this work. The functional groups (-NH<sub>2</sub>, -OH, -CO, -CHO, -COOH, -COO) that form on the surface of the dots have a significant impact on the optical characteristics of N-CQDs. The preparation techniques and the precursor components are the main determinants of the kind and quantity of functional groups. In this study, CQDs were produced using a microwave-assisted synthesis process, beginning with urea and citric acid. The impact of the microwave power level on the surface functional groups on the dots' surface was then carefully evaluated. It was discovered that raising the microwave power level improves the PL by increasing the density of functional groups on the exterior of CQDs. On the other hand, heating at high microwave power lowers the PL intensity and functional group concentration. The produced N-CQDs' stability, catalytic activity, and sensing were investigated. This study emphasizes how surface functional groups affect PL emission and how to physically control them. Fluorescence quenching effect was produced by the addition of Fe<sup>3+</sup> and Zn<sup>2+</sup> ions to the N-CQD solution. Moreover, the samples were evaluated in the degradation of methylene blue, and the sample synthesized at medium microwave power showed the highest degradation rate. These findings demonstrated the as-synthesized N-CQDs samples can be used as sensors and photocatalyst.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112564"},"PeriodicalIF":4.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365029","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

Coal-derived carbon quantum dots modified MnO2 nanowires as cathode for enhanced aqueous zinc-ion battery 煤源碳量子点修饰二氧化锰纳米线作为增强型水性锌离子电池的阴极

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-20 DOI: 10.1016/j.diamond.2025.112565

Fan Zhang , Haoran Pan , Liye Shuai , Yafen Zheng , Xinning Huang , Tao Wang , Jianglong Yu , Dongling Wu , Jinxiao Dou , Xingxing Chen

{"title":"Coal-derived carbon quantum dots modified MnO2 nanowires as cathode for enhanced aqueous zinc-ion battery","authors":"Fan Zhang , Haoran Pan , Liye Shuai , Yafen Zheng , Xinning Huang , Tao Wang , Jianglong Yu , Dongling Wu , Jinxiao Dou , Xingxing Chen","doi":"10.1016/j.diamond.2025.112565","DOIUrl":"10.1016/j.diamond.2025.112565","url":null,"abstract":"<div><div>Manganese-based materials are widely used as cathode materials in aqueous zinc-ion batteries (AZIBs) because of their abundant natural reserves, low production costs, and high theoretical capacity. However, their susceptibility to disproportionation reactions and ease of dissolution, significantly hinder their practical applications. To address these challenges, coal-based carbon quantum dots (CQDs) were first synthesized via a solvothermal process using anthracite powder as the raw material. These CQDs were subsequently combined with manganese dioxide (MnO<sub>2</sub>) to create MnO<sub>2</sub>@CQDs composites for use as cathode materials in AZIBs. The incorporation of CQDs into MnO<sub>2</sub> introduced additional active sites, effectively enhancing the conductivity and stability of MnO<sub>2</sub>. As a result, the synthesized MnO<sub>2</sub>@CQDs composites exhibited superior electrochemical zinc storage performance. Specifically, they delivered a specific capacity of 160 mAh g<sup>−1</sup> at a current density of 0.1 A g<sup>−1</sup>, and maintained 95.4 % of their initial capacity after 500 cycles at 1 A g<sup>−1</sup>. This study provides a new idea for the development of manganese-based cathode materials by integrating value-added earth-abundant coal-derived CQDs as a promoter, offering promise for the advancement of AZIBs technology.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112565"},"PeriodicalIF":4.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470011","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

Magnetic bismuth sulfide-decorated activated carbon nanocomposite for ultrasensitive electrochemical determination of felodipine in real samples 磁性硫化铋修饰活性炭纳米复合材料超灵敏电化学测定实际样品中的非洛地平

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-19 DOI: 10.1016/j.diamond.2025.112556

Mohamed Abd-Elsabour , Mortaga M. Abou-Krisha , Abdulrahman G. Alhamzani , Mohamed Gouda , Ehab A. Abdelrahman

{"title":"Magnetic bismuth sulfide-decorated activated carbon nanocomposite for ultrasensitive electrochemical determination of felodipine in real samples","authors":"Mohamed Abd-Elsabour , Mortaga M. Abou-Krisha , Abdulrahman G. Alhamzani , Mohamed Gouda , Ehab A. Abdelrahman","doi":"10.1016/j.diamond.2025.112556","DOIUrl":"10.1016/j.diamond.2025.112556","url":null,"abstract":"<div><div>Reliable and accurate analytical techniques are vital for detecting felodipine (FLD), a calcium channel blocker used to treat hypertension, in real samples. In this study, a voltammetric sensor with enhanced sensing performance for the electrochemical detection of FLD is designed based on a carbon paste electrode (CPE) modified with magnetic bismuth sulfide loaded activated carbon nanocomposite (M@Bi<sub>2</sub>S<sub>3</sub>NPs-AC). The effective development of the synthesized nanocomposite was confirmed by its characterization using SEM, XRD, TEM and EDX. The combination of Fe<sub>3</sub>O<sub>4</sub> and Bi<sub>2</sub>S<sub>3</sub> NPs within the porous AC network results in a multifunctional hybrid where, AC improves FLD accumulation and provides a conductive backbone, Bi<sub>2</sub>S<sub>3</sub> accelerates the electro-oxidation reaction, and Fe<sub>3</sub>O<sub>4</sub> enhances magnetic handling, stability, and conductivity ensuring a large electroactive surface area and fast electron transfer. The sensor exhibited a linear correlation for FLD in the concentration range of 0.009–3 μM under ideal conditions using differential pulse voltammetry (DPV), with a low detection limit of 2.3 nM. The technique demonstrated stability over four weeks, good reproducibility (RSD = 0.48 %), and exceptional selectivity even in the presence of frequent interferents. By evaluating FLD in pharmaceutical tablets and human blood serum samples, the sensor's practical application was confirmed, yielding good recoveries (97.2–102.8 %). This suggested sensor provides a quick, economical, and accurate method for determining FLD in medical and quality control labs.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112556"},"PeriodicalIF":4.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144365048","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

Enhancing the interfacial reaction kinetics of CNT yarn-based Zn-V2O5 batteries via cone-spinning engineering 通过锥形纺丝工程提高CNT纱基锌- v2o5电池的界面反应动力学

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-19 DOI: 10.1016/j.diamond.2025.112566

Binbin Ding , Hongye Xia , Shuai Wang , Guiyang Li , Zhi Liu , Lihua Zou , Zhiqi Zhao , Hao Jia , Xianhong Zheng

{"title":"Enhancing the interfacial reaction kinetics of CNT yarn-based Zn-V2O5 batteries via cone-spinning engineering","authors":"Binbin Ding , Hongye Xia , Shuai Wang , Guiyang Li , Zhi Liu , Lihua Zou , Zhiqi Zhao , Hao Jia , Xianhong Zheng","doi":"10.1016/j.diamond.2025.112566","DOIUrl":"10.1016/j.diamond.2025.112566","url":null,"abstract":"<div><div>Flexible aqueous zinc-ion batteries (AZIBs) have emerged as promising candidates for wearable smart devices due to their inherent safety, mechanical adaptability, and eco-friendly aqueous electrolytes. However, practical implementation of yarn-shaped AZIBs remains challenged by insufficient capacity, non-uniform active material distribution, and limited energy density. Herein, we report a cone-spinning engineering strategy to fabricate carbon nanotube/vanadium pentoxide (CNT/V₂O₅) composite yarn cathodes with optimized architecture and Zn<sup>2+</sup> storage capability. Compared with biscrolled counterparts, the cone-spun CNT/V<sub>2</sub>O<sub>5</sub> yarn demonstrates exceptional electrochemical metrics, including a high areal capacity of 1.32 mAh cm<sup>−2</sup> at 1 mA cm<sup>−2</sup> and remarkable volumetric energy density of 168.76 mWh cm<sup>−3</sup> at 145.80 mW cm<sup>−3</sup>. Notably, these values surpass most state-of-the-art yarn-based zinc-ion batteries reported to date. These advancements stem from the hierarchically engineered cathode architecture of cone-spun yarns, leading to the enhanced interfacial reaction kinetics. Additionally, the assembled yarn-shaped AZIBs can be utilized to efficiently store the solar energy to power wearable electronics. This work pioneers a hierarchical structural engineering strategy to achieve high-performance yarn-based AZIBs, paving the way for next-generation wearable energy storage systems.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112566"},"PeriodicalIF":4.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144321263","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

Superelastic N-centered carbon quantum dots: Synthesis and characterization 超弹性n中心碳量子点：合成与表征

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-19 DOI: 10.1016/j.diamond.2025.112568

Ana Marković , Ana Popović-Bijelić , Marija Mojsin , Janez Kovač , Jaroslav Kuliček , Vladimir Pavlović , Biljana Todorović Marković , Zoran Marković

{"title":"Superelastic N-centered carbon quantum dots: Synthesis and characterization","authors":"Ana Marković , Ana Popović-Bijelić , Marija Mojsin , Janez Kovač , Jaroslav Kuliček , Vladimir Pavlović , Biljana Todorović Marković , Zoran Marković","doi":"10.1016/j.diamond.2025.112568","DOIUrl":"10.1016/j.diamond.2025.112568","url":null,"abstract":"<div><div>Carbon quantum dots (CQDs) have highly promising properties for variety of applications as a new family member of carbon-based nanomaterials. In this paper, CQDs were synthetized by solvothermal method using nicotinamide as precursor. For the first time, we report on electron paramagnetic resonance (EPR) active CQDs with numerous unpaired N radicals at the edges of CQDs. Nanomechanical measurements revealed internal structure of CQDs that are more elastic than single wall carbon nanotubes (SWCNTs). Electrostatic force microscopy showed average amount of electrons in CQDs core and positive charge at the edges. Polymer nanocomposites based on CQDs were not cytotoxic and hemolytic whereas antibacterial testing shown good antibacterial activity. Reactive oxygen species production measurements indicated that nanocomposites were highly potent generators of reactive oxygen species with singlet oxygen yield of 0.68 and promising materials for application in biomedicine.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112568"},"PeriodicalIF":4.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144364481","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

Study on the preparation and properties of phospholipid-modified nanodiamond/polyvinyl alcohol biodegradable composite materials 磷脂修饰纳米金刚石/聚乙烯醇可生物降解复合材料的制备及性能研究

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-19 DOI: 10.1016/j.diamond.2025.112560

Zimeng He, Jianxin Rong, Qingxin Zhang, Xiongwei Qu, Xiaoyan Yu

{"title":"Study on the preparation and properties of phospholipid-modified nanodiamond/polyvinyl alcohol biodegradable composite materials","authors":"Zimeng He, Jianxin Rong, Qingxin Zhang, Xiongwei Qu, Xiaoyan Yu","doi":"10.1016/j.diamond.2025.112560","DOIUrl":"10.1016/j.diamond.2025.112560","url":null,"abstract":"<div><div>Polyvinyl alcohol (PVA) is an excellent biodegradable material. To address its inherent disadvantages such as low mechanical properties, we studied an environmentally friendly method for preparing nanodiamond/polyvinyl alcohol (ND/PVA) composites, which significantly improved the performance of the composites. To address the key aggregation problem of nanodiamond (ND), we first homogenized the -COOH on the ND surface by thermal oxidation. Then the -OH on the phospholipid head formed hydrogen bonds with the -COOH on the ND surface and adsorbed on the ND surface. This was confirmed by infrared spectroscopy and thermogravimetric experiments. The repulsive force between the phospholipid alkyl chains effectively prevented the agglomeration of nanoparticles and improved the dispersibility and interfacial adhesion with the PVA matrix. The effects of nanoparticles on the structure, thermal properties and mechanical properties of the polymer matrix were studied by scanning electron microscopy, thermogravimetric analysis and tensile testing. The experimental results showed that 1.5 wt% ND-PL loading can achieve the optimal performance of PVA. Compared with PVA, the mechanical properties of ND/-PL/PVA-1.5 % were enhanced, with a 174.8 % increase in tensile strength and a 217.8 % increase in tensile modulus. The thermal stability of ND-PL/PVA-1.5 % was improved, and the heat resistance index (T<sub>HRI</sub>) increased by 108.26 % compared with PVA, T<sub>g</sub> increased to 61.79 °C.The thermal conductivity increased by 212.8 %. In addition, the addition of ND effectively improved the crystallinity and hydrophilicity of PVA. This broadened the path for the application of PVA.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112560"},"PeriodicalIF":4.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470012","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

Preparation and performance study of sodium silicate-diamond composite thermal management materials 硅酸钠-金刚石复合热管理材料的制备及性能研究

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-19 DOI: 10.1016/j.diamond.2025.112569

Leibo Huang , Zhengxin Li , Mohib Ullah , Yonggang Guo

{"title":"Preparation and performance study of sodium silicate-diamond composite thermal management materials","authors":"Leibo Huang , Zhengxin Li , Mohib Ullah , Yonggang Guo","doi":"10.1016/j.diamond.2025.112569","DOIUrl":"10.1016/j.diamond.2025.112569","url":null,"abstract":"<div><div>Thermally conductive adhesives have become a significant research hotspot and have found broad applications in electronics and thermal management due to their excellent physical and chemical properties. However, the increasing demand for efficient heat dissipation in advanced electronics requires better adhesive performance. This study presents a novel inorganic thermally conductive adhesive using sodium silicate as the matrix and diamond micropowders as fillers. To enhance interfacial compatibility, diamond micropowders were surface-etched to increase surface area and functionalized with a silane coupling agent. Additionally, diamond micropowders with different sizes were blended in specific mass ratios to optimize performance, clearly demonstrating the systematic influence of diamond content on adhesive properties. The results clearly show that etching treatment of diamond micropowders enhances both the bonding performance and thermal conductivity of the adhesive. With increasing diamond content, the adhesive strength first increases and then decreases, reaching a peak at a filler mass fraction of 60 %. A similar trend was observed for the thermal conductivity, reaching a maximum at 50 % diamond content. The thermally conductive adhesive prepared with etched diamond micropowders exhibits a maximum tensile shear strength of 1.98 MPa and the highest thermal conductivity of 6.32 W·m<sup>−1</sup>·K<sup>−1</sup>. Furthermore, the thermal stability was improved, with the adhesive containing 80 % diamond micropowders losing only 2.06 % of its weight when heated from room temperature to 550 °C. Thus, we realize that controlling the content of diamond micropowders yields optimal bonding strength, improved thermal conductivity and excellent thermal stability, showing a greater potential for electronic thermal management.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112569"},"PeriodicalIF":4.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144321355","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

Characterization of a carbon nanotube-based X-ray microbeam generation system for low-dose radiobiology 基于碳纳米管的低剂量放射生物学x射线微束产生系统的表征

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-19 DOI: 10.1016/j.diamond.2025.112567

Hanna Lee , Jinho Choi , Amar Prasad Gupta , Jaekyu Jang , Jaeik Jung , Moonkyoo Kong , Kyung-Sik Yoon , Jehwang Ryu

{"title":"Characterization of a carbon nanotube-based X-ray microbeam generation system for low-dose radiobiology","authors":"Hanna Lee , Jinho Choi , Amar Prasad Gupta , Jaekyu Jang , Jaeik Jung , Moonkyoo Kong , Kyung-Sik Yoon , Jehwang Ryu","doi":"10.1016/j.diamond.2025.112567","DOIUrl":"10.1016/j.diamond.2025.112567","url":null,"abstract":"<div><div>We developed a carbon nanotube (CNT)-based field emission system to generate low-dose X-ray microbeams, aimed at radiobiological studies requiring precise dose control. The CNT emitter was directly synthesized on a metal alloy substrate in a radial pattern to enhance field emission performance, achieving a stable emission current of 3 mA at −14 kV in both continuous and pulsed modes. Simulations and experiments confirmed that an emitter-to-window distance of 20 mm provided the highest electron collision efficiency (16.14 %) with minimal scattering. A linear relationship between input power (0.5–70 W) and radiation dose (0.01–3.2 cGy) enabled predictable and adjustable dose delivery. Moreover, the pulsed irradiation capability of the system facilitated temporal modulation through different duty cycles. Cell viability studies (1–10 cGy) revealed distinct responses to continuous versus pulsed exposure, underscoring the potential of the system for investigating adaptive mechanisms and hormesis effects in low-dose radiation biology. This compact, CNT-based X-ray source offers precise spatiotemporal dose control in dual operational modes, opening new opportunities for systematically exploring radiobiological phenomena under low-dose conditions.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112567"},"PeriodicalIF":4.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470015","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

Effect of surfactant on the microstructure and microwave-absorbing properties of helical carbon nanotubes/doped barium ferrite composites 表面活性剂对螺旋碳纳米管/掺杂钡铁氧体复合材料微观结构和吸波性能的影响

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-18 DOI: 10.1016/j.diamond.2025.112533

Xinyang Wang , Shicheng Wei , Bo Wang , Yujiang Wang , Yi Liang , Yong Zhang , Quan Xu , Weiyang Fu , Kening Huang , Zhen Liu

{"title":"Effect of surfactant on the microstructure and microwave-absorbing properties of helical carbon nanotubes/doped barium ferrite composites","authors":"Xinyang Wang , Shicheng Wei , Bo Wang , Yujiang Wang , Yi Liang , Yong Zhang , Quan Xu , Weiyang Fu , Kening Huang , Zhen Liu","doi":"10.1016/j.diamond.2025.112533","DOIUrl":"10.1016/j.diamond.2025.112533","url":null,"abstract":"<div><div>Doped barium ferrite/helical carbon nanotube composites were prepared using a sol-gel method. The microstructure of doped barium ferrite/helical carbon nanotube composites treated with different surfactants was analyzed using scanning electron microscopy, Nanoparticle potentiometer, specific surface and porosity analyzer, ultraviolet-visible spectrometer, cold field emission scanning electron microscope, and X-ray diffraction. The electromagnetic parameters and absorption properties of the composites were analyzed using a vector network analyzer, and the enhancing mechanism of the absorption properties of doped barium ferrite/helical carbon nanotube composites was studied. The results show that the barium ferrite particles and carbon nanotubes in the composite material are overlapped through the sheet-line and sheet-sheet interactions, which results in a rich microcavity structure and a good conductive network. The composites treated with sodium dodecyl sulfate (SDS, 10 g/L) exhibit good potential difference and system stability due to the combination of electrostatic repulsion, van der Waals attraction, space repulsion, and vacancy repulsion. The composite treated with SDS exhibits the strongest return loss (−56.84 dB at 3.12 GHz with a matching thickness of 3.12 mm) among all composites. It also has a wide absorption frequency band of 6.34 GHz, which covers the Ku band with a matching thickness of only 1.44 mm. The main loss mechanisms are polarization relaxation, multiple scattering of electromagnetic waves, conduction loss, natural resonance, and domain wall resonance.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112533"},"PeriodicalIF":4.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331209","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

Preparation and properties of Ag nanoparticle-filled expanded graphite paraffin-based composite phase change materials with high temperature response properties 具有高温响应性能的Ag纳米颗粒填充膨胀石墨石蜡基复合相变材料的制备与性能

IF 4.3 3区材料科学

Diamond and Related Materials Pub Date : 2025-06-18 DOI: 10.1016/j.diamond.2025.112561

Qin Wu, Yingchen Kang, Zhenhao Tang, Lujun Cui, Xuechun Yan, Zhongjin Ni

{"title":"Preparation and properties of Ag nanoparticle-filled expanded graphite paraffin-based composite phase change materials with high temperature response properties","authors":"Qin Wu, Yingchen Kang, Zhenhao Tang, Lujun Cui, Xuechun Yan, Zhongjin Ni","doi":"10.1016/j.diamond.2025.112561","DOIUrl":"10.1016/j.diamond.2025.112561","url":null,"abstract":"<div><div>Paraffin wax (PW), despite being an excellent energy storage material, suffers from limited applications due to its low thermal conductivity and propensity for liquid-phase leakage. In this study, PW is employed as the phase change material (PCM), expanded graphite (EG) serves as the support material, and silver nanoparticles function as additives to enhance thermal conductivity. Silver-modified expanded graphite (Ag@EG) is synthesized through a liquid-phase reduction process. Subsequently, composite PCMs of Ag@EG/PW with varying mass ratios, which exhibit high thermal conductivity and stability, are fabricated via a vacuum impregnation method. Characterization techniques, including SEM, FTIR, XPS, and SEM-EDX, confirm the existence of Ag in EG in the form of well-dispersed elemental silver. XRD analysis demonstrates the favorable chemical compatibility of the composite PCMs. The prepared composite PCMs all possess a latent heat exceeding 110 J/g. Specifically, the thermal conductivity of the 1wt%Ag@10wt%EG/PW composite PCMs reaches 0.989 W/(m·K), representing a 292.5 % enhancement compared to PW. Additionally, this composite material exhibits excellent thermal cycling stability, anti-leakage properties, and temperature responsiveness. In conclusion, this research is expected to pave the way for the application of Ag@EG/PW composite PCMs in fields where high temperature sensitivity is required.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"157 ","pages":"Article 112561"},"PeriodicalIF":4.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331207","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