Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第3页

Antibacterial double-layer calcium phosphate/chitosan composite coating on metal implants for tissue engineering 用于组织工程的金属植入物抗菌双层磷酸钙/壳聚糖复合涂层

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-07 DOI: 10.1016/j.colsurfa.2024.135652

Anna I. Kozelskaya , Andreas Früh , Sven Rutkowski , Semen I. Goreninskii , Ksenia N. Verzunova , Elena A. Soldatova , Elena V. Dorozhko , Johannes Frueh , Olga V. Bakina , Michael A. Buldakov , Evgeny L. Choinzonov , Leonid K. Brizhan , Artur A. Kerimov , Igor V. Khominets , Denis V. Davydov , Sergei I. Tverdokhlebov

In this study, four different promising two-layer composite coatings on titanium substrates with antibacterial properties were investigated. Two different types of antibacterial agents were used to impart antibacterial properties to the coatings: antibiotic amikacin (in three different concentrations) and zinc. Chitosan, which also has antibacterial properties, was used as a carrier layer for amikacin on a calcium phosphate coating incorporating zinc. This combination should enable long-term antibacterial properties of a bone implant and thus prevent potential complications during wound healing due to bacterial contamination. To examine the physico-chemical properties of the samples, the elemental, chemical and phase compositions, the thickness and the wettability of the coatings were investigated. The release of amikacin from the chitosan coatings was investigated using high-performance liquid chromatography. Antibacterial activity of the prepared coatings was evaluated against five hospital bacteria strains (Staphylococcus aureus, Pseudomonas aeruginosa, Acinetobacter baumannii, Enterococcus faecalis, Klebsiella pneumoniae) and one strain from the microbial strain collection (methicillin-resistant Staphylococcus aureus, ATCC 43300). To investigate the cell toxicity of the composite coating, cell adhesion, proliferation and osteogenic differentiation were tested with mesenchymal stem cells. According to the results, the composite coatings with an amikacin concentration of 5.0 and 7.5 percent by weight have the best biological and antibacterial properties.

本研究调查了四种不同的具有抗菌性能的钛基材双层复合涂层。两种不同类型的抗菌剂被用来赋予涂层抗菌性能：抗生素阿米卡星（三种不同浓度）和锌。壳聚糖也具有抗菌特性，被用作阿米卡星在含锌磷酸钙涂层上的载体层。这种组合可使骨植入物具有长期抗菌特性，从而防止伤口愈合过程中因细菌污染而可能出现的并发症。为了研究样品的物理化学特性，我们对涂层的元素、化学和相组成、厚度和润湿性进行了研究。使用高效液相色谱法研究了壳聚糖涂层中阿米卡星的释放情况。评估了所制备涂层对五种医院菌株（金黄色葡萄球菌、铜绿假单胞菌、鲍曼不动杆菌、粪肠球菌、肺炎克雷伯菌）和一种微生物菌株（耐甲氧西林金黄色葡萄球菌，ATCC 43300）的抗菌活性。为了研究复合涂层的细胞毒性，使用间充质干细胞对细胞粘附、增殖和成骨分化进行了测试。结果表明，阿米卡星浓度为 5.0% 和 7.5% 的复合涂层具有最佳的生物和抗菌性能。

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引用次数: 0

Construction of Au nanoparticles decorated on ZnFe2O4@ZnIn2S4 core-shell structure to enhance photocatalytic hydrogen production 构建装饰在 ZnFe2O4@ZnIn2S4 核壳结构上的金纳米粒子以提高光催化制氢能力

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-07 DOI: 10.1016/j.colsurfa.2024.135705

Jiahui Song , Wen Ge , Sidi Deng , Jiawen Tang , Shukang Deng , Peizhi Yang

Developing effective photocatalysts for water splitting is essential to generating H₂ energy sources. Herein, a novel ZnFe₂O₄@ZnIn₂S₄/Au ternary composite (abbreviated as ZFO@ZIS/Au) was successfully designed and fabricated by loading Au nanoparticles on the ZFO@ZIS surfaces for effective photocatalytic H₂ generation for the first time. Attributed to the synergistic effect of the traditional II-type heterojunction charge transfer and Au nanoparticles as co-catalysts, the ZFO@ZIS/Au heterojunction generated greater amounts of hydrogen under visible light irradiation. The ZFO-7 %@ZIS/Au-2 catalyst displayed the highest H₂ production rate of 1145.38 μmol∙g⁻¹∙h⁻¹, which was almost 3.87 times more than the ZIS value. Furthermore, several characterization techniques were performed to investigate the catalysts and evaluate the catalyst's photocatalytic activity when exposed to visible light. Lastly, a detailed discussion of the corresponding photocatalytic H₂ production process of the as-prepared ZFO@ZIS/Au heterojunction was provided. The distinctive research might offer a potential approach for modifying zinc ferrate for photocatalytic hydrogen production.

开发有效的光催化剂用于水分离对产生 H2 能源至关重要。在本文中，通过在 ZFO@ZIS 表面负载金纳米颗粒，首次成功设计和制备了新型 ZnFe2O4@ZnIn2S4/Au 三元复合材料（简称 ZFO@ZIS/Au），用于有效光催化产生 H2。由于传统的 II 型异质结电荷转移和金纳米粒子作为辅助催化剂的协同作用，ZFO@ZIS/Au 异质结在可见光照射下产生了更多的氢气。ZFO-7 %@ZIS/Au-2 催化剂的氢气产生率最高，达到 1145.38 μmol∙g-1∙h-1，几乎是 ZIS 值的 3.87 倍。此外，还采用了多种表征技术来研究催化剂，并评估了催化剂在可见光照射下的光催化活性。最后，详细讨论了制备的 ZFO@ZIS/Au 异质结的相应光催化 H2 生成过程。这项独特的研究可能会为改性铁酸锌用于光催化制氢提供一种潜在的方法。

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引用次数: 0

Bio-inspired synthesis of Ag-g-C3N4 nanocomposites and their application for photocatalytic degradation of para-nitrophenol Ag-g-C3N4 纳米复合材料的生物启发合成及其在对硝基苯酚光催化降解中的应用

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-07 DOI: 10.1016/j.colsurfa.2024.135739

Shoaib Mukhtar , Erzsébet Szabó-Bárdos , Ottó Horváth , Éva Makó , Tatjána Juzsakova , Zsombor Molnár

Nanocomposites are promising in advanced materials for environmental applications due to their ability to boost functionality through synergistic effects. Graphitic carbon nitride (g-C₃N₄) is renowned for its exceptional characteristics in photocatalysis. This work examines the preparation of g-C₃N₄ from different precursors, and how the presence of silver nanoparticles (Ag NPs) and silver ions (Ag⁺) in g-C₃N₄ matrices improve their combined effect on photocatalytic activity, specifically in the degradation of para-nitrophenol (PNP), a persistent organic pollutant. From urea and melamine precursors for the preparation of g-C₃N₄, the latter provided a much higher yield. Using an easy synthesis approach, Ag NPs were evenly distributed in the g-C₃N₄ framework, whereas Ag⁺ ions were incorporated by an apparent physical procedure. A bio-inspired, environmentally friendly method was also applied to prepare Ag NPs. The nanocomposites showed improved light absorption and separation of charge carriers due to the synergistic interaction between g-C₃N₄ and Ag species. Using UV and Vis LED light sources, we investigated both pure g-C₃N₄ and Ag-g-C₃N₄ catalysts. For breaking down para-nitrophenol, the silver-modified catalysts performed significantly better than pure g-C₃N₄ in both UV and Vis. The study clarified the functions of Ag NPs and Ag⁺ ions in enhancing photocatalytic activity by examining their involvement in generating reactive oxygen species and degrading pollutants. This work highlights the capability of g-C₃N₄-based nanocomposites as effective photocatalysts for environmental remediation. It also explores the benefits of adding silver species to improve performance in degrading pollutants.

纳米复合材料能够通过协同效应增强功能，因此在先进材料的环境应用中大有可为。氮化石墨碳（g-C3N4）因其在光催化方面的卓越特性而闻名于世。这项研究探讨了用不同的前驱体制备 g-C3N4 的方法，以及 g-C3N4 基质中银纳米粒子（Ag NPs）和银离子（Ag+）的存在如何提高它们对光催化活性的综合影响，特别是在降解对硝基苯酚（PNP）（一种持久性有机污染物）方面。在制备 g-C3N4 的尿素和三聚氰胺前体中，后者的产率要高得多。通过简便的合成方法，Ag NPs 均匀地分布在 g-C3N4 框架中，而 Ag+ 离子则通过明显的物理过程加入其中。此外，还采用了一种生物启发的环保方法来制备 Ag NPs。由于 g-C3N4 和 Ag 物种之间的协同作用，纳米复合材料显示出更好的光吸收和电荷载流子分离性能。我们使用紫外线和可见光 LED 光源研究了纯 g-C3N4 和 Ag-g-C3N4 催化剂。在紫外和可见光条件下，银修饰催化剂在分解对硝基苯酚方面的性能明显优于纯 g-C3N4。该研究通过研究银纳米粒子和 Ag+ 离子在生成活性氧和降解污染物方面的参与，阐明了它们在增强光催化活性方面的功能。这项工作强调了基于 g-C3N4 的纳米复合材料作为有效光催化剂进行环境修复的能力。它还探讨了添加银物种以提高降解污染物性能的益处。

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引用次数: 0

Enhanced microwave absorption in organogels: The synergy of polar molecules and magnetic particles 增强有机凝胶的微波吸收：极性分子和磁性颗粒的协同作用

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-07 DOI: 10.1016/j.colsurfa.2024.135712

Wanting Xu , Jie Li , You Wu , Zhongchen Lu , Tao Wang , Wenbo Ju , Bin Yuan

Herein, wideband microwave absorbing materials with high flexibility are developed by creating a novel layered organogel composite consisting of carbonyl iron particles (CIP) and polyacrylamide (PAM), employing ethylene glycol (EG) as the solvent. The microwave absorbing properties of layered absorbers with different CIP contents are investigated over the 1–18 GHz range. An integrated stratified architecture was obtained using polar EG molecules and magnetic CIP particles, which were the main contributors to magnetic and dielectric losses in the PAM matrix. The results indicated that the minimum reflection loss reaches a value of −48.0 dB at a thickness of 2 mm and a frequency of 15.5 GHz; meanwhile, an effective absorption bandwidth of 3.2 GHz in the C-band can also be obtained. An analysis of the absorption mechanism shows that the combination of an impedance-matching layer composed of CIP magnetic particles and an absorption layer composed of EG polar molecules in the PAM matrix provides strong broadband absorption in the C-band. Overall, the CIP/EG@PAM organogel composites have simple preparation, high flexibility, and it has adhesion. This study provides a new strategy for designing wideband microwave absorbing materials.

本文以乙二醇（EG）为溶剂，通过制造由羰基铁颗粒（CIP）和聚丙烯酰胺（PAM）组成的新型层状有机凝胶复合材料，开发出了具有高柔性的宽带微波吸收材料。研究了不同 CIP 含量的分层吸收体在 1-18 GHz 范围内的微波吸收特性。利用极性 EG 分子和磁性 CIP 颗粒获得了一种集成分层结构，它们是 PAM 矩阵中磁损和介损的主要贡献者。结果表明，在厚度为 2 mm、频率为 15.5 GHz 时，最小反射损耗值达到 -48.0 dB；同时，在 C 波段还能获得 3.2 GHz 的有效吸收带宽。对吸收机制的分析表明，由 CIP 磁性颗粒组成的阻抗匹配层和 PAM 矩阵中由 EG 极性分子组成的吸收层相结合，可在 C 波段提供强大的宽带吸收。总之，CIP/EG@PAM 有机凝胶复合材料具有制备简单、柔韧性高、附着力强等特点。这项研究为设计宽带微波吸收材料提供了一种新策略。

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引用次数: 0

Efficient biochar regeneration for a circular economy: Removing emerging contaminants for sustainable water treatment 高效生物炭再生，促进循环经济：去除新出现的污染物，实现可持续水处理

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135730

Oussama Baaloudj , Serge Chiron , Angelica Rebecca Zizzamia , Vincenzo Trotta , Daniele Del Buono , Debora Puglia , Marco Rallini , Monica Brienza

Biochar is widely known as a highly effective adsorbent for water treatment, capable of removing a wide range of pollutants. However, its saturation point limits its long-term use, but regeneration can extend its applicability. This study aims to develop a sustainable method for removing pollutants from water that aligns with the concept of the circular economy. Biochar derived from forest residue was used to remove emerging pollutants such as fipronil (FIP), venlafaxine (VEN), sulfamethoxazole (SMX) and trimethoprim (TRM). A comparative analysis of the adsorption of the studied pollutants onto biochar was performed by analyzing the kinetics, where it was found that SMX exhibited the lowest adsorption efficiency, prompting further optimization experiments. Under optimal conditions, adsorption isotherms were used to investigate the pollutant removal mechanisms. The results showed that biochar exhibited high adsorption capacities for FIP, VEN, SMX and TRM, which were 3.77, 2.09, 2.71 and 3.88 mg/g, respectively. Regeneration treatments were applied to remove adsorbed contaminants after biochar saturation. Among them, heat-activated persulfate showed the most effective regeneration, maintaining biochar's adsorption capacity after five cycles with no significant loss. Eventual morphological, structural and chemical alterations post-regeneration were assessed using different characterization techniques. The findings of this research highlight the potential of biochar for sustainable water treatment, supporting the circular economy by extending its life cycle through effective regeneration.

众所周知，生物炭是一种高效的水处理吸附剂，能够去除多种污染物。然而，生物炭的饱和点限制了它的长期使用，但再生可以扩大其适用范围。本研究旨在开发一种符合循环经济理念的可持续方法，用于去除水中的污染物。从森林残渣中提取的生物炭被用来去除新出现的污染物，如氟虫腈（FIP）、文拉法辛（VEN）、磺胺甲噁唑（SMX）和三甲氧苄啶（TRM）。通过分析动力学，对所研究的污染物在生物炭上的吸附情况进行了比较分析，发现 SMX 的吸附效率最低，这促使进行进一步的优化实验。在最佳条件下，利用吸附等温线研究污染物的去除机制。结果表明，生物炭对 FIP、VEN、SMX 和 TRM 的吸附容量较高，分别为 3.77、2.09、2.71 和 3.88 mg/g。生物炭饱和后，采用再生处理去除吸附的污染物。其中，热激活过硫酸盐的再生效果最好，经过五个循环后，生物炭的吸附能力保持不变，且没有明显损失。使用不同的表征技术评估了再生后最终的形态、结构和化学变化。这项研究的结果凸显了生物炭在可持续水处理方面的潜力，通过有效再生延长生物炭的生命周期，支持循环经济。

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引用次数: 0

Assessment of three quinolin-8-ol-imidazole hybrids as corrosion carbon steel inhibitors in acidic conditions employing practical and theoretical methodologies 利用实践和理论方法评估三种喹啉-8-醇咪唑杂化物作为酸性条件下碳钢缓蚀剂的性能

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135690

Z. Amrani , M. El Faydy , Z. Safi , N. Wazzan , A. Boutakiout , F. Benhiba , I. Warad , M. Rbaa , B. Lakhrissi , H. Oudda , Anees A. Khadom , A. Zarrouk

Three hybrids of quinolin-8-ol-imidazole were scrutinized as corrosion inhibitors in 1 M HCl for carbon steel (Cstl). These hybrids are 5-((2-(4-(dimethylamino)phenyl)-4,5-diphenyl-1H-imidazol-1-yl)methyl)quinoline-8-ol (Quin-Amino), 5-((4,5-diphenyl-2-(p-tolyl)-1H-imidazol-1-yl)methyl)quinoline-8-ol (Quin-Tolyl), and 5-((2-(4-bromophenyl)-4,5-diphenyl-1H-imidazol-1-yl)methyl)quinoline-8-ol (Quin-Br). The current research includes a mixture of methods. In addition to computational approaches, several experimental approaches were employed, such as electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM-EDX), UV–vis spectroscopy, and potentiodynamic polarization (PDP). The investigated hybrids' corrosion resistance was encountered to be concerned by the concentration, temperature, and chemical structure, which attained a maximum of 96.1 % for Quin-Amino, 93.4 % for Quin-Tolyl, and 92.5 % for Quin-Br at 10⁻³ M, respectively. The PDP results illustrated that the studied hybrids performed as mixed-type inhibitors. In addition, the chemisorption of these hybrids on the Cstl surface obeyed the Langmuir adsorption isotherm. SEM-EDX confirmed that the effectiveness of the three hybrids lies in their capability to develop an organic layer on the Cstl surface. The density functional theory (DFT) was employed for theoretical calculations. Molecular dynamics (MD) simulations manifest that hybrids are oriented beneficially on the Fe (110) surface, providing a high surface coverage and thus a high inhibition performance.

研究了三种喹啉-8-醇咪唑混合物，作为碳钢（Cstl）在 1 M HCl 中的缓蚀剂。这些混合物是 5-((2-(4-(二甲基氨基)苯基)-4,5-二苯基-1H-咪唑-1-基)甲基)喹啉-8-醇（Quin-Amino）、5-((4、5-((4,5-二苯基-2-(对甲苯基)-1H-咪唑-1-基)甲基)喹啉-8-醇（Quin-Tolyl）和 5-((2-(4-溴苯基)-4,5-二苯基-1H-咪唑-1-基)甲基)喹啉-8-醇（Quin-Br）。目前的研究包括多种方法。除计算方法外，还采用了多种实验方法，如电化学阻抗光谱法（EIS）、扫描电子显微镜法（SEM-EDX）、紫外可见光谱法和电位极化法（PDP）。结果表明，所研究的杂化物的耐腐蚀性与浓度、温度和化学结构有关，在 10-3 M 时，Quin-Amino、Quin-Tolyl 和 Quin-Br 的耐腐蚀性分别达到 96.1%、93.4% 和 92.5%。PDP 结果表明，所研究的混合物具有混合型抑制剂的性能。此外，这些杂化物在 Cstl 表面的化学吸附符合 Langmuir 吸附等温线。扫描电子显微镜（SEM-EDX）证实，这三种混合物的功效在于它们能在 Cstl 表面形成有机层。理论计算采用了密度泛函理论（DFT）。分子动力学（MD）模拟结果表明，混合物在铁（110）表面具有良好的定向性，提供了高表面覆盖率，因此具有很高的抑制性能。

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引用次数: 0

Boosting catalytic activity of Fe-based perovskite by compositing with Co oxyhydroxide for peroxymonosulfate activation and ofloxacin degradation 通过与氢氧化钴复合提高过一硫酸盐活化和氧氟沙星降解中铁基包晶的催化活性

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135706

Yin Wang , Wannan Xia , Guanhao Jiao , Jinfeng Wang , Yishu Gong , Qiji Yin , Hu Jiang , Xiaodong Zhang

A novel Fe-based perovskite hybrid catalyst was designed by sol-gel preparation of Ni-substitution of LaFeO₃ containing in-situ growth of metal oxyhydroxide (MeOOH, Me=Mn, Ni, Co). The performances of metal oxyhydroxide-perovskite composites (MeOOH/LaFe_0.5Ni_0.5O₃) for peroxymonosulfate (PMS) activation and ofloxacin (OFL) degradation were investigated. CoOOH/LaFe_0.5Ni_0.5O₃ exhibited the best OFL degradation efficiency of 91.84 % within 15 min. Compared with LaFe_0.5Ni_0.5O₃, the specific surface area (from 21.391 to 100.216 m²·g⁻¹) and pore volume (from 0.080 to 0.226 cm³·g⁻¹) of CoOOH/LaFe_0.5Ni_0.5O₃ increased drastically. Among the structures and properties, substitution of Ni into B-site of LaFeO₃ accelerated the electron transfer and promoted the redox cycle between Fe³⁺/Fe²⁺ and Ni²⁺/Ni⁰. Besides, doping with CoOOH could provide more active sites for the catalyst and more electrons for the activation of PMS to generate reactive species. The higher redox potential of Co ions resulted in good thermodynamic cycling between Co³⁺/Co²⁺, Fe³⁺/Fe²⁺ and Ni²⁺/Ni⁰. Moreover, oxygen vacancies (V_o) on the material surface were involved in the activation of PMS. Quenching experiments and electron paramagnetic resonance (EPR) verified that the catalytic reaction was primarily driven by both ·O₂^- (radical way) and ¹O₂ (non-radical way), with electron transfer process (ETP) also had some effect on OFL degradation. In addition, the conversion of radicals to non-radicals was demonstrated. Finally, the degradation pathway of OFL and the ecotoxicity of the intermediates were proposed. The work provided scientific support and theoretical basis for the development of efficient heterogeneous PMS catalysts.

通过溶胶-凝胶法制备镍取代LaFeO3，并在其中原位生长金属氧氢氧化物（MeOOH，Me=Mn、Ni、Co），设计出了一种新型铁基过氧化物杂化催化剂。研究了金属氢氧化物-超晶石复合材料（MeOOH/LaFe0.5Ni0.5O3）在过硫酸盐（PMS）活化和氧氟沙星（OFL）降解方面的性能。CoOOH/LaFe0.5Ni0.5O3 在 15 分钟内降解 OFL 的效率最高，达到 91.84%。与 LaFe0.5Ni0.5O3 相比，CoOOH/LaFe0.5Ni0.5O3 的比表面积（从 21.391 到 100.216 m2-g-1）和孔隙率（从 0.080 到 0.226 cm3-g-1）均有显著提高。在这些结构和性质中，将 Ni 取代到 LaFeO3 的 B 位加速了电子传递，促进了 Fe3+/Fe2+ 和 Ni2+/Ni0 之间的氧化还原循环。此外，掺杂 CoOOH 可为催化剂提供更多的活性位点，为活化 PMS 生成活性物种提供更多的电子。此外，材料表面的氧空位（Vo）也参与了 PMS 的活化。淬灭实验和电子顺磁共振（EPR）证实，催化反应主要由-O2-（自由基方式）和1O2（非自由基方式）驱动，电子转移过程（ETP）对 OFL 降解也有一定影响。此外，还证明了自由基向非自由基的转化。最后，提出了 OFL 的降解途径和中间产物的生态毒性。这项工作为开发高效的异相 PMS 催化剂提供了科学支持和理论依据。

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引用次数: 0

The evolution mechanism of ethylene-based and glass-ceramic as composited anti-seepage masking layer for Ni-based superalloy during aluminizing 乙烯基和玻璃陶瓷作为镍基超合金镀铝过程中复合防渗掩蔽层的演变机理

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135732

Dai Yan-zhang , Zou Jian-peng , Shi Qian , Li Xiao-ya , Wei Hong-ming

This study addresses the diverse application requirements of turbine blades by utilizing a composite anti-seepage masking layer to protect the Ni-based superalloy from Al deposition during aluminizing. Simultaneously, the unmasked areas simulate blade airfoils for aluminized coating formation. Ethylene-based and glass-ceramic coatings were evaluated for anti-seepage effectiveness after aluminizing at 800 ∼ 1000 ℃. The results reveal that ethylene-based coatings prevent Al diffusion into the substrate at 800 ℃, and degradation occurs at higher temperatures. However, adding a glass-ceramic coating significantly enhances high-temperature stability and suppresses ethylene-based coating fluidity. The composited anti-seepage masking layer, with the ethylene-based and glass-ceramic coating applied twice, exhibits excellent anti-seepage masking performance on GH4169, DZ22B, and K477 superalloys, providing protection and easy removal without affecting unmasked areas. This approach improves the comprehensive performance of turbine blades, meeting the requirements of both dovetail and airfoil sections.

本研究利用复合防渗掩蔽层来保护镍基超合金，防止铝在镀铝过程中沉积，从而满足涡轮叶片的各种应用要求。同时，未遮蔽区域模拟叶片机翼，以形成镀铝涂层。在 800 ∼ 1000 ℃ 下镀铝后，对乙烯基涂层和玻璃陶瓷涂层的防渗效果进行了评估。结果表明，乙烯基涂层能阻止铝在 800 ℃ 下扩散到基底中，在更高温度下会发生降解。然而，添加玻璃陶瓷涂层可显著提高高温稳定性，并抑制乙烯基涂层的流动性。在 GH4169、DZ22B 和 K477 超合金上，乙烯基涂层和玻璃陶瓷涂层两次涂覆的复合防渗掩蔽层表现出优异的防渗掩蔽性能，既能提供保护，又易于清除，不会影响未掩蔽区域。这种方法可提高涡轮叶片的综合性能，同时满足燕尾和翼面部分的要求。

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引用次数: 0

Multi-layered quasi-2D perovskite based triboelectric nanogenerator 基于多层准二维包晶的三电纳米发电机

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135728

Rayyan Ali Shaukat , Muhammad Noman , Qazi Muhammad Saqib , Ahmad Umair , Mirza Mahmood Baig , Muhammad Yousuf , Mahesh Y. Chougale , Jungmin Kim , Swapnil R. Patil , Chandrashekhar S. Patil , Seung Goo Lee , Jinho Bae

Inorganic-organic perovskites are considered as one of the emerging candidates as a tribopositive material in triboelectric nanogenerators (TENG) owing to their unique functionalities. Among them, quasi-two-dimensional (quasi-2D) perovskites are promising materials for TENG due to layered nature, excellent environmental and chemical stability, tunability, and excellent electrical properties. Herein, we investigate the performance of TENG based on multiple series of perovskite layers using simple solution processing technique. The dimensionality of the perovskite layers is attained by changing the stoichiometric ratios of phenylethylammonium iodide (PEAI), lead iodide (PbI₂), methylammonium iodide (MAI). The quasi-2D based TENG generates the maximum output electrical performance with a voltage of 306 V, current of 4.71 µA, and maximum power density of 3.48 µW/cm² at the optimum value of (<n> = 5) due to the higher concentration of C–N and N–H groups. Moreover, the fabricated device shows stable performance for 12,000 cycles. The TENG device is further utilized to charge the various commercially available capacitors, for lightning of light-emitting diodes (LEDs), and to power up low-power electronic devices. These results demonstrate the effect of the dimensionality of perovskites on the output performance of the TENG for use in next-generation energy harnessing.

无机有机包晶石因其独特的功能而被认为是三电纳米发电机（TENG）中新兴的三电材料之一。其中，准二维（quasi-2D）包晶石因其层状性质、优异的环境和化学稳定性、可调性和出色的电学特性而成为很有前景的三电纳米发电机材料。在此，我们利用简单的溶液处理技术研究了基于多系列包晶层的 TENG 性能。我们通过改变苯基乙基碘化铵（PEAI）、碘化铅（PbI2）和甲基碘化铵（MAI）的化学计量比来实现包晶石层的维度。由于 C-N 和 N-H 基团的浓度较高，基于准二维的 TENG 在最佳值（<n> = 5）时可产生最大输出电气性能，电压为 306 V，电流为 4.71 µA，最大功率密度为 3.48 µW/cm2。此外，所制造的器件在 12,000 次循环中表现出稳定的性能。TENG 器件还可进一步用于为各种市售电容器充电、为发光二极管（LED）照明以及为低功耗电子设备供电。这些结果表明了包晶尺寸对 TENG 输出性能的影响，可用于下一代能源利用。

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引用次数: 0

Advanced nano-composite coatings of ZrB₂/ZrC/SiC on carbon fibers via eco-friendly precursor synthesis 通过生态友好型前驱体合成在碳纤维上形成先进的 ZrB₂/ZrC/SiC 纳米复合涂层

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-06 DOI: 10.1016/j.colsurfa.2024.135729

Niranjan Patra

This study presents a comprehensive investigation into the synthesis and characterization of ZrB₂/ZrC/SiC composite coatings on carbon fiber substrates via a solution-based process followed by high-temperature pyrolysis. The precursor solution was prepared using Gum Ghatti (GG), zirconyl chloride, tetraethyl orthosilicate, and boric acid. Optimization of precursor concentration and molar ratios was performed to achieve suitable viscosity and composition. The pyrolysis process was conducted in an argon atmosphere, resulting in the formation of well-defined ZrB₂, ZrC, and SiC phases. XRD analysis confirmed the phase composition, while SEM imaging revealed spheroidal particle aggregates with a uniform distribution of composite phases. TG-DTA analysis reveals the thermal decomposition behavior, highlighting distinct stages of mass loss and phase transformations. Coated carbon fibers exhibited enhanced oxidation resistance, as evidenced by TGA analysis. SEM analysis confirmed the uniform distribution and adhesion of the composite matrix on the carbon fiber substrate. This study demonstrates the successful synthesis of ZrB₂/ZrC/SiC composite coatings with promising thermal properties for advanced applications.

本研究介绍了通过溶液法工艺在碳纤维基底上合成 ZrB2/ZrC/SiC 复合涂层并对其进行表征的综合研究。前驱体溶液使用 Gum Ghatti (GG)、氯化锆、正硅酸四乙酯和硼酸制备。对前驱体浓度和摩尔比进行了优化，以获得合适的粘度和成分。热解过程在氩气环境中进行，最终形成了界限分明的 ZrB2、ZrC 和 SiC 相。XRD 分析证实了相的组成，而 SEM 成像显示了复合相均匀分布的球形颗粒聚集体。TG-DTA 分析显示了热分解行为，突出了质量损失和相变的不同阶段。TGA 分析表明，涂层碳纤维具有更强的抗氧化性。扫描电镜分析证实了复合基质在碳纤维基底上的均匀分布和附着力。这项研究表明，ZrB2/ZrC/SiC 复合涂层的成功合成具有良好的热性能，可用于先进的应用领域。

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引用次数: 0