Diamond and Related Materials最新文献_第2页

Mechanism and suppression method of grain burial in laser sharpening of bronze-bond diamond wheels 铜结合剂金刚石砂轮激光锐化过程中晶粒埋藏机理及抑制方法

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-24 DOI: 10.1016/j.diamond.2026.113357

Fengrong Luo , Genyu Chen , Wei Zhou , Wei Wang , Longjian Wang , Yinghui Ren , Jie Li

Laser technology is increasingly being applied to the dressing of diamond wheels, not only enabling high profile accuracy but also enhancing its grinding performance. However, diamond wheel is a super-hard composite material, diamond exhibits significantly different thermophysical properties from the bond. This disparity introduces considerable uncertainties in the laser processing of diamond grinding wheels. In this study, the phenomenon of grain burial was first observed in a nanosecond laser sharpening bronze-bonded diamond wheel. Even with sufficient removal depth of the bronze bond, the diamond grains did not protrude as expected but instead ended up below the bond plane. It caused unstable grinding behavior, increased wheel clogging, and reduced grinding quality. Through detailed analysis of the changes in the wheel's surface morphology, the mechanism of laser sharpening was uncovered and the reason for grain burial was identified. This phenomenon is strongly influenced by the laser power input and the differences in thermophysical properties between diamond and bronze. Further increasing the laser power to 30 W, exceeding the theoretical value, effectively addressed the grain burial issue. At last, the subsequent strategy using a 5 W low-power laser cleaning was also proposed to mitigate the associated thermal effects resulting from high power.

激光技术越来越多地应用于金刚石砂轮的修整，不仅提高了金刚石砂轮的精度，而且提高了金刚石砂轮的磨削性能。然而，金刚石砂轮是一种超硬复合材料，金刚石与结合剂表现出明显不同的热物理性质。这种差异给金刚石砂轮的激光加工带来了相当大的不确定性。在这项研究中，首次在纳秒激光锐化青铜结合金刚石砂轮时观察到晶粒埋藏现象。即使铜键有足够的去除深度，钻石颗粒也没有像预期的那样突出，而是最终落在键平面以下。造成磨削性能不稳定，增加砂轮堵塞，降低磨削质量。通过对砂轮表面形貌变化的详细分析，揭示了激光锐化的机理，确定了晶粒埋藏的原因。这种现象受到激光输入功率和金刚石与青铜热物理性质差异的强烈影响。进一步将激光功率提高到30 W，超过理论值，有效地解决了晶粒埋藏问题。最后，还提出了使用5w低功率激光清洗的后续策略，以减轻高功率引起的相关热效应。

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引用次数: 0

The non-graphitization machining process and performance models for hybrid laser-waterjet micromachining of polycrystalline diamonds 激光-水射流复合微加工多晶金刚石的非石墨化加工工艺及性能模型

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-23 DOI: 10.1016/j.diamond.2026.113360

Dalin Guo , Xi Hou , Yanyan Jing , Tianpeng Dun , Jun Wang , Lijuan Zheng

Polycrystalline diamond (PCD) exhibits excellent mechanical properties, such as high hardness, high wear resistance and superior toughness. However, the difficulties in its efficient machining without graphitization and microcracks have hindered the application of this material. An experimental study of the hybrid laser-waterjet machining process for a polycrystalline diamond is presented to reveal and characterize the material removal process. It is found that non-graphitization machining without recast layers and microcracks can be realized by the impact and cooling effects of the waterjet in this hybrid technology, while a slight heat-affected zone (HAZ) can be observed at the machined surfaces. The effect of process parameters on the microgrooving performance is discussed in detail, which shows that the laser pulse energy is positively correlated with the various machining performance indicators, a larger laser pulse overlap not only enlarged the HAZ but also reduced the material removal rate (MRR), while increasing the water pressure was beneficial to reducing the HAZ and increasing the MRR. Within the range of process parameters considered in this work, the combination of 99.6% laser pulse overlap (PO), 0.5 mJ laser pulse energy (E_p) and not lower than 30 MPa water pressure (P_wj) yields competitive machining performance without PCD graphitization. The predictive models for the various microgrooving performance indicators are then developed using dimensional analysis and experimentally verified. It is found the models can give adequate predictions with the average deviations of less than 5% for the range of process conditions considered in this study.

聚晶金刚石（PCD）具有优异的机械性能，如高硬度、高耐磨性和优异的韧性。然而，难以实现无石墨化和无微裂纹的高效加工，阻碍了该材料的应用。为了揭示和表征多晶金刚石的材料去除过程，对激光-水射流复合加工工艺进行了实验研究。研究发现，在混合工艺中，水射流的冲击和冷却作用可实现无重铸层和微裂纹的非石墨化加工，但在加工表面可观察到轻微的热影响区。研究了工艺参数对微沟槽性能的影响，结果表明，激光脉冲能量与各加工性能指标呈正相关，较大的激光脉冲重叠不仅会增大HAZ，而且会降低材料去除率（MRR），而增大水压力有利于减小HAZ，提高MRR。在本研究所考虑的工艺参数范围内，99.6%的激光脉冲重叠（PO）、0.5 mJ的激光脉冲能量（Ep）和不低于30 MPa的水压（Pwj）的组合可以在不发生PCD石墨化的情况下获得具有竞争力的加工性能。通过量纲分析，建立了各种微槽性能指标的预测模型，并进行了实验验证。研究发现，对于本研究所考虑的工艺条件范围，模型可以给出充分的预测，平均偏差小于5%。

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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

Diamond and Related Materials

Pub 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

Electro-catalytic response of disposable unmodified screen-printed carbon electrode towards the sensitive detection of iodide directly in urine and salt samples 一次性未改性丝网印刷碳电极对尿液和食盐样品中碘离子直接敏感检测的电催化响应

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-21 DOI: 10.1016/j.diamond.2026.113356

Abdul Niaz , Muhammad Balal Arain , Jameel Ahmed Baig , Mustafa Soylak

Direct and trace level urinary iodide detection is a challenging task. In the present work, a simple and highly sensitive electrochemical detection method has been explored for iodide employing a completely bare AC-1 (BVT) screen printed carbon electrode (SPCE). The specific electrochemical performance of the bare AC-1 electrode was evaluated which showed a superior catalytic response towards iodide detection as compared to the other SPCE. The surface morphology, composition and defects of the bare AC-1 and DS-110 SPCEs was compared through energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and Raman spectroscopy. Compare to DS-110, the AC-1 electrode showed highly porous morphology, greater oxygen to carbon ratio (10:82) and higher intensity ratio (I_D/I_G = 1.25). Due to the favorable porosity, more oxygenated binding and edge/plane active sites, the electrode exhibited superior electro-catalytic activity towards iodide. These features facilitated the fast electron transfer process which gave rise a lower peak potential separation and a significantly enhance peak current signal for iodide oxidation, as confirmed by cyclic voltammetry. By using a linear sweep cathodic stripping voltammetric (LSCSV) technique, the electrode efficiently accumulated iodide at its surface providing more sensitive response. Under the carefully optimized conditions, the unmodified electrode showed a good linear behavior in the concentration range from 0.32 to 125 μM with a limit of detection (LOD) of 0.075 μM. The sensor demonstrated good repeatability (RSD of 2%) and selective response in the presence of other substances. The method was applied for the direct analysis of iodide in urine sample effectively covering the recommended urinary iodide concentration ranges. The method was also successfully applied to determine iodide in iodate fortified salt sample which showed good percent recoveries. Thus, the low cost bare electrode was found to be a simple alternative to the modified electrodes which can be successfully employed for the routine analysis of iodide in urine and salt samples by providing high sensitivity, selectivity and reproducibility.

直接和痕量尿碘检测是一项具有挑战性的任务。本文采用全裸AC-1 （BVT）丝网印刷碳电极（SPCE），探索了一种简单、高灵敏度的碘化物电化学检测方法。结果表明，与其他SPCE相比，裸露的AC-1电极对碘化物检测具有更好的催化反应。通过能量色散x射线能谱（EDX）、扫描电镜（SEM）和拉曼光谱（Raman spectroscopy）对AC-1和DS-110 spce的表面形貌、成分和缺陷进行了比较。与DS-110相比，AC-1电极具有较高的多孔性、更高的氧碳比（10:82）和更高的强度比（ID/IG = 1.25）。由于具有良好的孔隙度，更多的氧结合和边缘/平面活性位点，电极对碘化物表现出优异的电催化活性。循环伏安法证实，这些特征有利于快速电子转移过程，从而产生较低的峰电位分离和显著增强的碘化物氧化峰电流信号。利用线性扫描阴极溶出伏安（LSCSV）技术，电极可以有效地在其表面积累碘化物，从而提供更灵敏的响应。在优化条件下，未经修饰的电极在0.32 ~ 125 μM的浓度范围内具有良好的线性行为，检出限为0.075 μM。该传感器具有良好的重复性（RSD为2%），在其他物质存在下具有选择性响应。该方法可用于尿样中碘的直接分析，有效地覆盖了尿碘推荐浓度范围。该方法还可用于碘酸盐强化盐样品中碘的测定，回收率良好。因此，低成本的裸电极是一种简单的替代修饰电极，可以成功地用于尿液和盐样品中的碘化物的常规分析，具有高灵敏度，选择性和重复性。

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引用次数: 0

Performance and mechanism of efficient degradation of diethylenetriamine (DETA) in water by UV/g-C3N4@BiOI/H2O2 system UV/g-C3N4@BiOI/H2O2体系高效降解水中二乙烯三胺（DETA）的性能及机理

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-21 DOI: 10.1016/j.diamond.2026.113355

Shifeng Ji , Zhuo Li , Yunqing Xing , Nan Yao , Yingjie Zhang , Changbing Ye , Guohua Wang , Maogang Hu , Chunmei Gao

Heterojunction-structured graphitic carbon nitride@bismuth oxyiodide (g-C₃N₄@BiOI) nanocomposites were successfully synthesized via a facile solvothermal method. The as-prepared composites were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and UV–visible diffuse reflectance spectroscopy (UV–vis DRS) to elucidate their microstructure, chemical composition, and optical properties. Subsequently, a highly efficient UV/g-C₃N₄@BiOI/H₂O₂ photocatalytic system was developed for the rapid degradation of diethylenetriamine (DETA). Under optimal conditions (initial pH 10.3, 0.4 mL/L H₂O₂, and 0.06 g/L 50 wt% g-C₃N₄@BiOI), the system achieved 95% DETA removal within 30 min under UV irradiation. Notably, cyclic degradation tests coupled with post-characterization revealed the exceptional stability and reusability of the g-C₃N₄@BiOI nanocomposite. Mechanistic studies through radical quenching experiments and electron paramagnetic resonance (EPR) spectroscopy confirmed •OH as the primary reactive species. Furthermore, the degradation pathways were elucidated by combining Gaussian 09 W theoretical calculations with gas chromatography–mass spectrometry (GC–MS) analysis. Finally, the toxicity evaluation model was established by toxicity evaluation software, and the experiments of mung bean germination and zebra fish egg incubation verified the effective detoxification of DETA solution after photocatalytic treatment.

采用溶剂热法成功合成了异质结结构石墨碳nitride@bismuth碘化氧（g-C3N4@BiOI）纳米复合材料。采用x射线衍射（XRD）、x射线光电子能谱（XPS）、透射电子显微镜（TEM）和紫外可见漫反射光谱（UV-vis DRS）对所制备的复合材料进行了表征，以阐明其微观结构、化学成分和光学性能。随后，建立了一种高效的UV/g-C₃N₄@BiOI/H₂O₂光催化体系，用于快速降解二乙基三胺（DETA）。在最佳条件下（初始pH为10.3,0.4 mL/L H₂O₂，0.06 g/L 50 wt% g- c₃N₄@BiOI），系统在紫外线照射下30 min内达到95%的DETA去除率。值得注意的是，循环降解测试和后期表征表明g-C₃N₄@BiOI纳米复合材料具有优异的稳定性和可重用性。通过自由基猝灭实验和电子顺磁共振（EPR）谱的机理研究证实•OH是主要的反应物质。结合高斯09 W理论计算和气相色谱-质谱（GC-MS）分析，阐明了其降解途径。最后，通过毒性评价软件建立毒性评价模型，并通过绿豆萌发和斑马鱼卵孵化实验验证了光催化处理后DETA溶液的有效解毒作用。

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引用次数: 0

Fast direct laser writing of flexible graphene/gold electrodes for simultaneous detection of dopamine and paracetamol 用于同时检测多巴胺和扑热息痛的柔性石墨烯/金电极的快速直接激光写入

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-21 DOI: 10.1016/j.diamond.2026.113358

Alexander V. Vavilov , Aleksei P. Zakharov , Aleksandra S. Levshakova , Maria V. Kaneva , Maxim S. Panov , Stanislav O. Gurbatov , Aleksandr A. Kuchmizhak , Evgeniia M. Khairullina , Alina A. Manshina

We report a scalable, one-step fabrication of flexible graphene–gold nanocomposite electrodes via direct laser writing on polyimide substrates using an affordable continuous wave diode laser. Simultaneous laser-induced carbonization of polyimide to porous laser-induced graphene and reduction of gold(III) acetate to uniformly distributed gold nanoparticles yields a conductive and electroactive laser-induced graphene/Au composite. Comprehensive characterization by scanning electron microscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy confirms the formation of a defect-rich graphene framework decorated with Au nanoparticles, with optimal laser parameters providing a minimum sheet resistance of 87 ± 5 Ω. The developed LIG/Au electrodes exhibit excellent electrochemical performance for the simultaneous detection of dopamine and paracetamol, achieving detection limits of 16 nM and 36 nM, respectively. Dopamine detection spans two linear ranges (0.1–50 μM and 50–300 μM) with sensitivities of 1.09 and 0.09 μA μM⁻¹ cm⁻², while paracetamol shows a single linear range (0.1–200 μM) with a sensitivity of 0.35 μA μM⁻¹ cm⁻². The flexible sensor demonstrates high selectivity against common biosensing interferents, remarkable mechanical robustness under cyclic bending, and long-term stability with more than 90% signal retention over 30 days. The proposed direct laser writing technique represents a rapid, low-cost, and easily scalable approach for high-throughput fabrication of robust, flexible electrodes suitable for multi-analyte electrochemical analysis.

我们报告了一种可扩展的、一步制备柔性石墨烯-金纳米复合电极的方法，该方法是使用价格合理的连续波二极管激光器在聚酰亚胺衬底上直接激光写入。激光诱导聚酰亚胺碳化成多孔的激光诱导石墨烯，同时将金（III）乙酸还原成均匀分布的金纳米颗粒，从而产生导电且电活性的激光诱导石墨烯/金复合材料。通过扫描电子显微镜、能量色散x射线能谱、拉曼光谱和x射线光电子能谱的综合表征证实，形成了一个富含缺陷的石墨烯框架，并以金纳米颗粒装饰，最佳激光参数提供了最小薄片电阻87±5 Ω。所开发的LIG/Au电极在同时检测多巴胺和扑热息痛方面表现出优异的电化学性能，分别达到16 nM和36 nM的检出限。多巴胺在0.1 ~ 50 μM和50 ~ 300 μM线性范围内检测，灵敏度分别为1.09和0.09 μA μM−1 cm−2；扑热息痛在0.1 ~ 200 μM线性范围内检测，灵敏度为0.35 μA μM−1 cm−2。柔性传感器对常见的生物传感干扰具有高选择性，在循环弯曲下具有显着的机械稳健性，并且在30天内具有超过90%的信号保留率的长期稳定性。提出的直接激光写入技术代表了一种快速，低成本，易于扩展的方法，用于高通量制造适用于多分析物电化学分析的坚固，柔性电极。

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引用次数: 0

Simultaneous electrochemical biosensing of theophylline and thymine in pharmaceuticals and DNA bases in meat samples using CdS/ZrO2@g-CN ternary nanocomposite-coated glassy carbon electrode 利用CdS/ZrO2@g-CN三元纳米复合涂层玻碳电极对药物中的茶碱和胸腺碱以及肉类样品中的DNA碱基进行电化学生物传感

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-20 DOI: 10.1016/j.diamond.2026.113338

Arumugam Poongan , Pauldurai Vasumathi , Murugan Anbarasu , N. Priyadharshini , Xiang Wang , Xingmao Jiang , Perumal Venkatesh

In this study, a new and simple electrochemical biosensor was created by modifying a glassy carbon electrode (GCE) altered with graphitic carbon nitride (g-CN) decorated with cadmium sulfide (CdS) and zirconium dioxide (ZrO₂) has been was developed and used for the voltammetric assessment of theophylline (TPE), thymine (TMN). Cyclic Voltammetry (CV) was utilized to examine the properties of the modified electrode, while Differential Pulse Voltammetry (DPV) was employed to inspect the electrochemical biosensor response of TPE and TMN on the CdS/ZrO₂@g-CN. The outcomes revealed that the TPE and TMN determination may be performed at the potential window while avoiding interference from the oxidation current peak. During optimal circumstances, the manufacturing nanocomposite sensor demonstrated outstanding results in determining TPE and TMN, exhibiting a linear dynamic ranging from 5 to 390 μM, 7 to 325.5 μM, as well as lower detection limits (S/N = 3) of 0.055and 0.064 μM, respectively. CdS/ZrO₂@g-CN/GCE sensor offered several advantages, including ease of manufacture, high sensitivity, stability, and reproducibility. The CdS/ZrO₂@g-CN/GCE enables real-time sensing of Theophylline and Thymine, with recovery results verified by HPLC standards to ensure precise and accurate quantification.

本研究利用硫化镉（cd）和二氧化锆（ZrO2）修饰石墨氮化碳（g-CN）修饰玻璃碳电极（GCE），制备了一种新型、简单的电化学生物传感器，并将其用于茶碱（TPE）、胸腺嘧啶（TMN）的伏安评价。采用循环伏安法（CV）检测改性电极的性能，采用差分脉冲伏安法（DPV）检测TPE和TMN在CdS/ZrO2@g-CN上的电化学生物传感器响应。结果表明，TPE和TMN的测定可以在电位窗口进行，同时避免氧化电流峰的干扰。在最佳条件下，所制备的纳米复合材料传感器在TPE和TMN的线性动态范围为5 ~ 390 μM， 7 ~ 325.5 μM，检测限（S/N = 3）分别为0.055和0.064 μM。CdS/ZrO2@g-CN/GCE传感器具有易于制造、高灵敏度、稳定性和可重复性等优点。CdS/ZrO2@g-CN/GCE能够实时检测茶碱和胸腺碱，回收率结果通过HPLC标准验证，确保精确和准确的定量。

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引用次数: 0

Enhanced thermal performances of high-power LED by diamond packaging 金刚石封装提高大功率LED的热性能

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-20 DOI: 10.1016/j.diamond.2026.113352

Sicheng Tan , Bin He , Xinqing Gao, Jiangtao Huang, Yuanmao Lai, Wang Zhang, Xiaorui Liu, Stephan Handschuh-Wang, Peigang Han

A bottleneck for high-power light emitting diodes (LEDs), laser diodes (LDs), and other high-power electronics is heat dissipation. To improve this aspect, in this study, diamond heat spreaders are used in conjunction with bonding enhanced by Ar-ion activation and TiC interlayer prior to metallization to reduce thermal resistance. Indeed, a low thermal resistance of the diamond heat spreader of 0.085 K/W was obtained, while for AlN and Al₂O₃, the thermal resistance were 0.35 K/W and 1.16 K/W, respectively. Experimental data and simulations illustrate the enhanced heat dissipation performance of the diamond heat spreader for LEDs, as temperature only reached 55.8 °C at an applied current of 3 A. The results highlight that diamond heat spreaders in conjunction with appropriate bonding strategies are an effective pathway for high-power electronics packaging.

大功率发光二极管（led）、激光二极管（ld）和其他大功率电子产品的瓶颈是散热。为了改善这方面的问题，在本研究中，在金属化之前，将金刚石导热片与ar离子活化增强的键合和TiC夹层结合使用，以降低热阻。金刚石导热片的热阻为0.085 K/W，而AlN和Al2O3导热片的热阻分别为0.35 K/W和1.16 K/W。实验数据和模拟表明，金刚石散热片的散热性能得到了增强，当施加电流为3a时，温度仅达到55.8℃。结果表明，金刚石导热片结合适当的粘接策略是高功率电子封装的有效途径。

引用次数: 0

Research on surface quality assessment using fractal dimension for two-dimensional ultrasonic-assisted grinding of unidirectional Cf/SiC composites 基于分形维数的单向Cf/SiC复合材料二维超声辅助磨削表面质量评价研究

IF 5.1 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2026-01-20 DOI: 10.1016/j.diamond.2026.113351

Zhenyan Duan , Tao Chen , Yuhao Suo , Haohui Shi , Junpeng Ye

Accurately characterizing surface quality is a prerequisite for the subsequent optimization of the processing scheme when processing of composites such as carbon fiber-reinforced silicon carbide matrix composites (C_f/SiCs). Properties such as the scale-free nature of the fractal dimension make it independent of the measuring accuracy of the instrument. In this study, the surface quality characterization of C_f/SiCs after two-dimensional ultrasonic-assisted grinding (2D-UAG) was explored using fractal dimension D_s. Firstly, C_f/SiCs were classified into three fiber arrangement directions, i.e., perpendicular, longitudinal, and transverse. Secondly, the fractal characteristics of C_f/SiCs in the three fiber orientations were demonstrated. The results showed that the self-similar magnification interval of the C_f/SiCs' image with longitudinal and vertical fiber arrangement is 200×–500× magnification. In addition, C_f/SiCs with different fiber orientation directions exhibited different material removal mechanisms, which in turn affected their surface quality. C_f/SiCs with perpendicular fiber arrangement have the best machined surface quality, while C_f/SiCs with longitudinal fiber arrangement have the worst machined surface quality.

在碳纤维增强碳化硅基复合材料（Cf/ sic）加工过程中，准确表征表面质量是后续优化加工方案的前提。诸如分形维数的无标度性质等特性使其与仪器的测量精度无关。本研究利用分形维数Ds对二维超声辅助磨削（2D-UAG）后的Cf/ sic表面质量进行了表征。首先，将Cf/ sic分为垂直、纵向和横向三个光纤排列方向；其次，分析了Cf/ sic在三种纤维取向下的分形特征。结果表明：纵向和纵向光纤排列的Cf/ sic图像的自相似放大倍数为200×-500×；此外，不同纤维取向的Cf/ sic表现出不同的材料去除机制，从而影响其表面质量。纤维垂直排列的Cf/ sic的加工表面质量最好，而纤维纵向排列的Cf/ sic的加工表面质量最差。

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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

Diamond and Related Materials

Pub 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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