Materials Chemistry and Physics最新文献_第10页

CO2 reforming of methane over Ni-Al-LDH catalysts prepared with different precipitants 用不同沉淀剂制备的 Ni-Al-LDH 催化剂对甲烷进行二氧化碳重整

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-01 DOI: 10.1016/j.matchemphys.2024.130115

Isabele Giordani Wenzel, Oscar W. Perez-Lopez

NiAl-LDH catalysts were synthesized using the co-precipitation method with different precipitant. One of the samples (NiAl_C) was prepared with a Na₂CO₃ solution, while the other sample (NiAl_M) was prepared with a mixture of Na₂CO₃ and NaOH. These catalysts were evaluated in the dry reforming of biogas, utilizing a synthetic biogas consisting of 60 % (v/v) CH₄ and 40 % CO₂. Characterization techniques including X-ray diffractometry (XRD), N₂ adsorption-desorption, thermogravimetric analysis (TGA), and temperature-programmed reduction and oxidation (H₂-TPR and TPO, respectively), NH₃, CO₂, and H₂ desorption (NH₃-TPD, CO₂-TPD, and H₂-TPD, respectively) where used in different stages of catalysts. Both samples resulted in LDH with small differences in cell parameter c and specific surface area. The precipitant containing NaOH led to an increase in the NiAl₂O₄ spinel phase and in the metallic dispersion of NiAl_M, enhancing thermal stability and resistance to sintering. However, this elevated metallic area facilitated the presence of acid sites, promoting CH₄ decomposition and carbon deposition. The reduction step proved unnecessary for this catalyst, as the reduced catalyst led to an increase in structured carbon formation. The delicate balance between thermal stability and carbon deposition favors the NiAl_M sample under reaction conditions without the reduction step.

采用共沉淀法与不同沉淀剂合成了 NiAl-LDH 催化剂。其中一个样品（NiAl_C）是用 Na2CO3 溶液制备的，而另一个样品（NiAl_M）则是用 Na2CO3 和 NaOH 的混合物制备的。这些催化剂在沼气干转化过程中进行了评估，使用的是由 60% (v/v) CH4 和 40% CO2 组成的合成沼气。在催化剂的不同阶段使用了表征技术，包括 X 射线衍射仪 (XRD)、N2 吸附-解吸、热重分析 (TGA)、温度编程还原和氧化（分别为 H2-TPR 和 TPO）、NH3、CO2 和 H2 解吸（分别为 NH3-TPD、CO2-TPD 和 H2-TPD）。两种样品都产生了 LDH，但电池参数 c 和比表面积差异很小。含有 NaOH 的沉淀剂增加了 NiAl2O4 尖晶石相和 NiAl_M 的金属分散度，提高了热稳定性和抗烧结性。然而，金属面积的增加会促进酸性位点的存在，从而促进 CH4 分解和碳沉积。事实证明，这种催化剂不需要还原步骤，因为还原后的催化剂会增加结构碳的形成。在没有还原步骤的反应条件下，热稳定性和碳沉积之间的微妙平衡有利于 NiAl_M 样品。

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引用次数: 0

Optimization of the performance of copper/graphite system for GIL Tri‐post grounding electrode based on plasma sintering technology 基于等离子烧结技术的 GIL 三柱接地电极铜/石墨系统性能优化

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-01 DOI: 10.1016/j.matchemphys.2024.130117

Zichen Zhang , Hao Yang , Ruilei Gong , Miaomiao Chen , Zengjie Li , Hailin Lu

Grounding electrodes, as crucial components of GIL bushings, experience friction with the GIL shell during long-term operation, generating metal particles that induce partial discharge. This phenomenon can lead to internal insulation breakdown, severely compromising GIL operation. This study focuses on enhancing the wear resistance of grounding electrodes by proposing a solution involving copper-graphite composites. Copper/graphite composite materials were fabricated using Spark Plasma Sintering technology. Additionally, the impact of graphite content and particle size on wear resistance, hardness, and electrical conductivity was comprehensively analyzed. Performance evaluation using radar chart analysis identified the optimal solution. The results indicate that at a sintering temperature of 960 °C, pressure of 45 MPa, and holding time of 15 min, with a graphite mass fraction of 7 %, the grounding electrode material exhibits a smooth surface and uniform distribution of graphite. Furthermore, when the graphite particle size is 4 μm, the friction coefficient remains approximately 0.7 with minimal fluctuations. The abrasion produces scratches measuring only 190 μm, and the wear rate is recorded at 2.1128 × 10⁻⁴ mm³/N·m, while the hardness reaches 59.6 HV, an increase of 19.6 HV compared to a particle size of 40 μm. In conclusion, an appropriate graphite content effectively enhances the wear resistance of the grounding electrode, and a reduction in graphite particle size optimizes overall performance. When the composite material contains 7 % graphite with a particle size of 4 μm, the performance is optimal, allowing the grounding electrode to maintain its original properties while demonstrating excellent wear resistance. This study provides a significant approach to optimizing the performance of grounding electrodes.

接地电极作为 GIL 套管的关键部件，在长期运行过程中会与 GIL 外壳发生摩擦，产生金属颗粒，从而引起局部放电。这种现象会导致内部绝缘击穿，严重影响 GIL 的运行。本研究的重点是通过提出铜/石墨复合材料的解决方案来增强接地电极的耐磨性。采用火花等离子烧结技术制造了铜/石墨复合材料。此外，还全面分析了石墨含量和粒度对耐磨性、硬度和导电性的影响。通过雷达图分析进行性能评估，确定了最佳解决方案。结果表明，在烧结温度为 960 ℃、压力为 45 兆帕、保温时间为 15 分钟、石墨质量分数为 7% 的条件下，接地电极材料表面光滑，石墨分布均匀。此外，当石墨粒径为 4 μm 时，摩擦系数保持在 0.7 左右，波动极小。磨损产生的划痕仅为 190 μm，磨损率为 2.1128 × 10-4 mm³/N-m，硬度达到 59.6 HV，比粒度为 40 μm 时增加了 19.6 HV。总之，适当的石墨含量能有效提高接地极的耐磨性，而减小石墨粒度则能优化整体性能。当复合材料中石墨含量为 7%、粒度为 4 μm 时，其性能达到最佳，接地极既能保持原有特性，又能表现出优异的耐磨性。这项研究为优化接地电极的性能提供了一种重要方法。

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引用次数: 0

Mixed-dimensional nanofluids: Synergistic thermal enhancement using 2D and 1D materials 混合维纳米流体：利用二维和一维材料协同增热

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-01 DOI: 10.1016/j.matchemphys.2024.130116

Shivakumar Jagadish Shetty , M.P. Shilpa , Saideep Shirish Bhat , Srivathsava Surabhi , K.S. Pavithra , A. Ganesha , T. Niranjana Prabhu , R.C. Shivamurthy , S.C. Gurumurthy

Excessive heat generation is a common problem in automobiles due to wear and tear of working parts. A suitable heat transfer system is required to avoid stalling automobiles due to the large quantity of heat generated. Liquids like water and ethylene glycol (EG) serve as a coolant by reducing generated heat. To further increase the effectiveness of these coolants, nanofluids which contain nanosized particles dispersed in base fluid like water, ethylene glycol, or a mixture of these two, can be used. In the present work, hybrid nanofluids using Ti₃C₂ (MXene) (2D) and functionalized multi-wall carbon nanotubes (F-MWCNTs) (1D) nanocomposites are prepared. The prepared material is characterized using X-ray diffraction (XRD) for structural analysis, field emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM) with energy dispersive X-ray analysis (EDAX) for morphological and elemental analysis, and Fourier transform infrared spectroscopy (FTIR) for identifying functional groups. The suitability of the prepared nanofluids is tested for heat transfer application by measuring the thermal conductivity and viscosity. The long-term stability of the nanofluids is verified by zeta potential measurement. The addition of the dispersant to the water has shown an enhanced thermal conductivity (about 10.83% at room temperature and 96.76% at 50 °C) while having lower viscosity compared to the base fluid (water), confirming the suitability for heat transfer applications.

由于工作部件的磨损，汽车普遍存在发热量过大的问题。为避免汽车因产生大量热量而熄火，需要一个合适的传热系统。水和乙二醇（EG）等液体可作为冷却剂，减少产生的热量。为了进一步提高这些冷却剂的效果，可以使用纳米流体，这种流体含有分散在水、乙二醇或这两种流体混合物等基础流体中的纳米颗粒。本研究使用 Ti3C2（MXene）（二维）和功能化多壁碳纳米管（F-MWCNTs）（一维）纳米复合材料制备了混合纳米流体。利用 X 射线衍射 (XRD) 进行结构分析，利用场发射扫描电子显微镜 (FESEM)、扫描电子显微镜 (SEM) 和高分辨率透射电子显微镜 (HR-TEM) 以及能量色散 X 射线分析 (EDAX) 进行形态和元素分析，并利用傅立叶变换红外光谱 (FTIR) 鉴定官能团。通过测量热导率和粘度，测试了制备的纳米流体在传热应用中的适用性。通过 zeta 电位测量验证了纳米流体的长期稳定性。与基础流体（水）相比，在水中添加分散剂可提高导热率（室温下约为 10.83%，50 ℃ 时约为 96.76%），同时降低粘度，从而证实了纳米流体在传热应用中的适用性。

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引用次数: 0

Enhancing microstructure, nanomechanical and tribological properties of TiAl alloy processed by spark plasma sintering with Si3N4 ceramic particulates addition 通过添加 Si3N4 陶瓷颗粒的火花等离子烧结工艺提高 TiAl 合金的微观结构、纳米力学和摩擦学性能

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-01 DOI: 10.1016/j.matchemphys.2024.130113

Azeez Lawan Rominiyi , Peter Madindwa Mashinini , Moipone Linda Teffo

TiAl matrix composites reinforced with varying weight fractions of Si₃N₄ ceramic particles were successfully fabricated by the spark plasma sintering method. The microstructure, nanomechanical and tribological properties of the sintered composites were investigated. The microstructural characterization revealed the evolution of a quasi-continuous and continuous network structure consisting of minor fractions of in-situ formed Ti₂AlN, unreacted Si₃N₄ ceramic particles and dominant Ti₅Si₃ intermetallic phases within the TiAl matrix at Si₃N₄ content above 1.5 wt%. The in-situ precipitated phases enhanced the nanomechanical and tribological properties of the composites. The 7Si₃N₄/TiAl composite displayed the best nanomechanical properties, including nanohardness, elastic modulus, and H/E_r ratio among the sintered samples. The specific wear rate of the composites decreases with increasing reinforcement content. 7Si₃N₄/TiAl composite exhibited the lowest specific wear rate of 0.38 ± 0.55

\times

10⁻⁴ mm³/Nm, representing a 95.6 % improvement in wear resistance compared to the unreinforced pure TiAl alloy. The improved wear performance of the composites was attributed to their load-bearing capacity and wear resistance of the hard, in-situ Ti₂AlN, Ti₅Si₃ and unreacted Si₃N₄ particles in the TiAl matrix. The composites displayed a transition from adhesive wear to predominantly abrasive wear where the hard Si₃N₄ particles prevented direct metal-to-metal contact and facilitated the formation of a protective tribolayer, resulting in enhanced wear resistance. Hence, the developed Si₃N₄/TiAl composites are suitable for various structural and tribological applications.

采用火花等离子烧结法成功地制造出了用不同重量分数的 Si3N4 陶瓷颗粒增强的 TiAl 基复合材料。研究了烧结复合材料的微观结构、纳米力学性能和摩擦学性能。微观结构表征显示，当 Si3N4 含量超过 1.5 wt% 时，TiAl 基体中出现了准连续和连续的网络结构，其中包括少量原位形成的 Ti2AlN、未反应的 Si3N4 陶瓷颗粒和主要的 Ti5Si3 金属间相。原位析出相增强了复合材料的纳米力学性能和摩擦学性能。在烧结样品中，7Si3N4/TiAl 复合材料显示出最佳的纳米力学性能，包括纳米硬度、弹性模量和 H/Er 比。复合材料的比磨损率随着增强成分的增加而降低。7Si3N4/TiAl 复合材料的比磨损率最低，为 0.38 ± 0.55 × 10-4 mm3/Nm，与未增强的纯 TiAl 合金相比，耐磨性提高了 95.6%。复合材料耐磨性能的提高归功于其承载能力和 TiAl 基体中坚硬的原位 Ti2AlN、Ti5Si3 和未反应的 Si3N4 颗粒的耐磨性。复合材料显示出从粘着磨损向主要是磨料磨损的过渡，其中坚硬的 Si3N4 颗粒阻止了金属与金属之间的直接接触，促进了保护摩擦层的形成，从而增强了耐磨性。因此，所开发的 Si3N4/TiAl 复合材料适用于各种结构和摩擦学应用。

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引用次数: 0

Highly sensitive electrochemical sensor based Nd2O3/graphene for monitoring additive compounds in palm oil product 基于钕2O3/石墨烯的高灵敏度电化学传感器用于监测棕榈油产品中的添加剂化合物

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-11-01 DOI: 10.1016/j.matchemphys.2024.130121

Rahmat Hidayat , Ganjar Fadillah , Febi Indah Fajarwati , Aldo Diandra Nur Ramdani , Qonita Awliya Hanif , Muhaimin

The use of additives, such as 3-monochloropropane-1,2-diol (3-MCPDs), in palm oil products can impact the product's quality and safety. Therefore, it is essential to have a sensitive and accurate detection method. This study explored the hydrothermal synthesis of Nd₂O₃/graphene (Nd₂O₃/G) composites and their application as electrochemical sensors for detecting 3-MCPDs as additive compounds in palm oil products. Different techniques for characterization, such as Fourier Transform Infra-Red (FTIR), X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM), supply evidence supporting the successful assembly and positive arrangement of the Nd₂O₃/G composite. The sensor's electrochemical efficacy is assessed concerning the detection of typical additives found in palm oil (3-MCPDs). The sensor performance test is studied by voltammetric technique. The modified sensor showed good analytical performance for detection of 3-MCPDs with improving electrocatalytic activity, electron transfer, and reduced charge transfer resistance (R_ct). These modifications greatly enhance the sensor's ability to accurately detect 3-MCPDs with limit of detection of 0.65 μM. This developed sensor shows a great stability and accuracy, thus it has potential to apply in quality control and daily analysis process.

在棕榈油产品中使用 3-氯丙二醇（3-MCPDs）等添加剂会影响产品质量和安全。因此，灵敏而准确的检测方法至关重要。本研究探讨了 Nd₂O₃/石墨烯（Nd₂O₃/G）复合材料的水热合成及其作为电化学传感器的应用，以检测棕榈油产品中作为添加剂化合物的 3-MCPD。傅立叶变换红外（FTIR）、X 射线衍射（XRD）和扫描电子显微镜（SEM）等不同的表征技术为 Nd₂O₃/G 复合材料的成功组装和正排列提供了证据。在检测棕榈油中的典型添加剂（3-MCPDs）方面，对传感器的电化学功效进行了评估。传感器性能测试采用伏安技术进行研究。改进后的传感器在检测 3-MCPDs 方面表现出良好的分析性能，电催化活性、电子传递和电荷转移电阻（Rct）均有所提高。这些改进大大提高了传感器准确检测 3-MCPDs 的能力，其检测限为 0.65 μM。这种新开发的传感器具有极高的稳定性和准确性，因此有望应用于质量控制和日常分析过程中。

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引用次数: 0

The influence of the nanostructure design on the corrosion behaviour of TiN thin films prepared by glancing angle deposition 纳米结构设计对闪烁角沉积法制备的 TiN 薄膜腐蚀性能的影响

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-10-31 DOI: 10.1016/j.matchemphys.2024.130100

Cláudia Lopes , Alexandra C. Alves , Armando Ferreira , Eduardo Alves , Nuno Pessoa Barradas , Ioana Borsan , Daniel Munteanu , Filipe Vaz

This study reports on the influence of nanostructure design on the corrosion behaviour of titanium nitride (TiN) thin films, prepared by DC reactive magnetron sputtering, using the Glancing Angle Deposition (GLAD) technique. The primary objective was to explore how modifying the deposition geometry affects the growth design and surface features of TiN films (keeping roughly constant the N/Ti ratio) and compare these effects with those produced by changing the chemical composition within the same thin film system (N/Ti increasing ratios). For this, two groups of samples were prepared: Group 1 – the samples were prepared in the conventional geometry (normal growth) with varied nitrogen content (stoichiometric and non-stoichiometric films) and; Group 2 – the samples were prepared with modified growth geometries (inclined and zigzag, with increasing incidence angles), keeping an almost unchanged stoichiometry. The results revealed increased surface porosity and roughness for Group 2 films compared to Group 1, demonstrating that deposition geometry can affect more significantly the surface characteristics than the composition variations. Corrosion studies indicated that the films prepared within Group 2, despite having higher porosity, showed a more stable open circuit potential (OCP) and nobler values than the reference close-stoichiometric TiN_0.92 film (reference sample) from Group 1. However, potentiodynamic polarization curves suggested higher corrosion kinetics for Group 2 films, most likely due to their increased surface heterogeneities. Electrochemical impedance spectroscopy (EIS) confirmed these findings, showing lower corrosion resistance for films prepared with inclined and zigzag geometries, if compared to the films prepared in conventional geometry (Group 1 samples).

This study advances the current state of the art on this film's responses, by demonstrating that tailoring nanostructure design through deposition geometry offers a promising approach to optimize the corrosion behaviour of TiN_x without the need to change its composition.

本研究报告介绍了纳米结构设计对氮化钛（TiN）薄膜腐蚀性能的影响，该薄膜采用直流反应磁控溅射法，并使用滑动角沉积（GLAD）技术制备而成。主要目的是探索改变沉积几何形状如何影响氮化钛薄膜的生长设计和表面特征（保持氮/钛比率基本不变），并将这些影响与改变同一薄膜系统中的化学成分（氮/钛比率增加）所产生的影响进行比较。为此，我们制备了两组样品：第 1 组--样品以传统几何形状（正常生长）制备，氮含量变化（化学计量薄膜和非化学计量薄膜）；第 2 组--样品以改良生长几何形状（倾斜和之字形，入射角增加）制备，化学计量几乎保持不变。结果显示，与第一组相比，第二组薄膜的表面孔隙率和粗糙度都有所增加，这表明沉积几何比成分变化对表面特性的影响更大。腐蚀研究表明，第 2 组制备的薄膜尽管孔隙率较高，但其开路电位（OCP）更稳定，其数值也比第 1 组的接近化学计量的 TiN0.92 参考薄膜（参考样品）更高。电化学阻抗光谱（EIS）证实了这些发现，与传统几何形状制备的薄膜（第 1 组样品）相比，采用倾斜和之字形几何形状制备的薄膜耐腐蚀性更低。这项研究表明，通过沉积几何形状定制纳米结构设计是优化 TiNx 腐蚀性能的一种可行方法，而无需改变其成分，从而推动了该薄膜响应技术的发展。

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引用次数: 0

Size-controlled synthesis and sensing properties of anthracene-based metal-organic frameworks for detection of singlet oxygen in photodynamic therapy 用于检测光动力疗法中单线态氧的蒽基金属有机框架的尺寸控制合成与传感特性

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-10-31 DOI: 10.1016/j.matchemphys.2024.130112

Ning Li , Ying Yang , Linshan Jia , Xiaotong Li , Yunkun Zhao , Xiaohong Hou

Developing fluorescent probes to detect singlet oxygen (¹O₂) is essential to understanding the critical role of ¹O₂ in immunological and pathological processes in various organs. In this study, size-controlled DPA-MOF (X) with good biocompatibility and excellent optical stability was used as a nanoprobe for real-time imaging and monitoring of ¹O₂ in photodynamic therapy (PDT). The experimentally synthesized DPA-MOF (X), which can be adjusted in particle size by dilution, exhibits blue fluorescence signals. The results show that smaller-sized DPA-MOF (60) has a faster response to ¹O₂ and higher cell uptake ability. The ratio of fluorescence intensity (F₀/F_i) of DPA-MOF (60) showed a linear correlation with the concentration of ¹O₂ in the range of 0–7 mM, with a detection limit of 88 μM. DPA-MOF has a distinct advantage over most carrier loading sensors in that it effectively avoids the issue of fluorophore leakage from the nanomaterial matrix, thereby improving its stability. Additionally, the controlled synthesis of DPA-MOF can potentially improve probe accumulation in tumors and lower the uptake by the body system. This study presents a luminescent metal-organic framework (LMOF) sensor that utilizes a ¹O₂ capture unit as a measuring ligand. This sensor has been shown to have exceptional biocompatibility and can be utilized for highly specific and efficient detection of ¹O₂ in vivo or living cells.

开发检测单线态氧（1O2）的荧光探针对于了解 1O2 在各种器官的免疫和病理过程中的关键作用至关重要。在这项研究中，具有良好生物相容性和优异光学稳定性的尺寸可控 DPA-MOF (X) 被用作纳米探针，用于光动力疗法（PDT）中 1O2 的实时成像和监测。实验合成的 DPA-MOF (X) 可通过稀释调节粒径，并显示蓝色荧光信号。结果表明，粒径较小的 DPA-MOF (60) 对 1O2 的反应速度更快，细胞吸收能力更强。在 0-7 mM 的范围内，DPA-MOF（60）的荧光强度比（F0/Fi）与 1O2 的浓度呈线性相关，检测限为 88 μM。与大多数载流子负载传感器相比，DPA-MOF 具有一个明显的优势，即它有效地避免了荧光团从纳米材料基质中泄漏的问题，从而提高了其稳定性。此外，DPA-MOF 的可控合成有可能改善探针在肿瘤中的积累，降低人体系统的吸收率。本研究介绍了一种利用 1O2 捕获单元作为测量配体的发光金属有机框架（LMOF）传感器。该传感器具有优异的生物相容性，可用于体内或活细胞中 1O2 的高特异性和高效检测。

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引用次数: 0

Poly (acrylic acid-co-2-hydroxyethyl methacrylate)-grafted gum ghatti hydrogel for capturing heavy metal ions 用于捕获重金属离子的聚（丙烯酸-2-羟乙基甲基丙烯酸酯）接枝树胶水凝胶

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-10-31 DOI: 10.1016/j.matchemphys.2024.130106

Praveen Kumar , Poorn Prakash Pande , Prateek Khare , Ravi Shankar , Arbind Chaurasiya , Narendra Pratap Tripathi

In this work, a facile route is explored for the synthesis of a novel polymer composite-based hydrogel (PC-hydrogel). The ratio of 2-(Hydroxyethyl) methacrylate (HEMA) and acrylic acid (AA) is optimized first based on Fourier transform infra-red spectroscopy, swelling ratio (SR%) and surface negative charge (PZC). Results indicate that PC-hydrogel composed of copolymer of HEMA: AA in 1:4 ratio is optimized, for grafting on Gum ghatti (Gg) during free-radical graft copolymerization process. Among all other possible combination of HEMA: AA, 1:4 ratio grafted Gg is termed as PC-hydrogel [Poly (AA-co-HEMA)-g-Gg]. PC-hydrogel exhibited negative surface charge over a wide range of pH owing to increase in AA. The swelling (g/g) and water retention ratio (%) of the prepared hydrogel have been found to be 342.6, 385 & 412.6 g/g and 74.83, 65.30 & 57.86 % in grey, tap and distilled water respectively. Furthermore, PC-hydrogel is applied for capturing Cu²⁺ and Co²⁺ ions in aqueous phases. Experimental results showed that adsorption process was pH-dependent, and the maximum capturing of Cu²⁺ and Co²⁺ was observed at neutral pH 7. Among different adsorption isotherms models like Langmuir, Freundlich, and Temkin models, experimental data fitted closely with the Langmuir adsorption model showing a maximum adsorption capacity of 381.67 and 328.94 mg/g for Cu²⁺ and Co²⁺ respectively. The capturing of metal ion followed pseudo-second-order rate model [rate constant k = 1.7 x 10⁻⁴ for Cu²⁺ and 1.5 x 10⁻⁴ for Co²⁺ g/(mg.min)]. The PC-hydrogel property retained its uptake capacity of metal ions up to the three successive adsorption−desorption cycles, and exhibited higher selectivity towards Cu²⁺ and Co²⁺ and other (NaCl, MgCl₂, CaCl₂) coexisting ions.

本研究探索了一种新型聚合物复合水凝胶（PC-hydrogel）的简便合成路线。首先根据傅立叶变换红外光谱、溶胀率（SR%）和表面负电荷（PZC）优化了甲基丙烯酸羟乙酯（HEMA）和丙烯酸（AA）的比例。结果表明，在自由基接枝共聚过程中，由 1:4 比例的 HEMA 和 AA 共聚物组成的 PC-水凝胶最适合接枝到 Gum ghatti（Gg）上。在所有其他可能的 HEMA: AA 组合中，1:4 比例接枝的 Gg 被称为 PC-hydrogel [聚（AA-co-HEMA）-g-Gg]。由于 AA 的增加，PC-水凝胶在很宽的 pH 值范围内都呈现出负表面电荷。制备的水凝胶在灰水、自来水和蒸馏水中的溶胀度（克/克）和保水率（%）分别为 342.6、385 和 412.6 克/克以及 74.83、65.30 和 57.86%。此外，PC-水凝胶还可用于捕捉水相中的 Cu2+ 和 Co2+ 离子。实验结果表明，吸附过程与 pH 值有关，在中性 pH 值为 7 时，Cu2+ 和 Co2+ 的吸附量最大。在 Langmuir、Freundlich 和 Temkin 等不同的吸附等温线模型中，实验数据与 Langmuir 吸附模型非常吻合，Cu2+ 和 Co2+ 的最大吸附容量分别为 381.67 和 328.94 mg/g。金属离子的捕获遵循伪二阶速率模型[Cu2+ 的速率常数 k = 1.7 x 10-4 和 Co2+ 的速率常数 k = 1.5 x 10-4 g/（mg.min）]。PC 水凝胶在连续三次吸附-解吸循环中都保持了对金属离子的吸附能力，并对 Cu2+、Co2+ 和其他（NaCl、MgCl2、CaCl2）共存离子表现出较高的选择性。

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引用次数: 0

In-situ formation of polymer-stabilized/-free cholesteric bi-layer photonic crystal 原位形成聚合物稳定/无胆固醇双层光子晶体

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-10-30 DOI: 10.1016/j.matchemphys.2024.130093

Kuan-Wu Lin, Chun-Chuan Wang, Yu-Chieh Chang, Yu-Chieh Li, Chun-Ta Wang

Tunable photonic crystals based on cholesteric liquid crystals (CLCs) have attracted considerable attention due to their tunable optical properties and self-assembly capabilities. Despite the rapid development of various CLC-based devices, the narrow bandwidth of the photonic bandgap in CLCs limits their use in some practical applications. This paper presents a method for forming polymer-stabilized and polymer-free cholesteric bilayer photonic crystals in polymer-stabilized cholesteric liquid crystals (PSCLCs). By tuning the concentration of reactive monomers and controlling the UV polymerization conditions, two different PBGs can be formed within a single PSCLC cell. As the concentration of RM257 increases to 40 % and the intensity of UV light is used at 22 mW/cm², the distance between the two reflectance bands can reach 200 nm, reflecting green and red light. The dynamic formation process and the tunability of these cholesteric bilayer structures under electric fields and temperature variations are investigated. By controlling the temperature and electric field, the reflectance of the liquid crystal layer can be reduced from 50 % to 15 %, resulting in a single-band reflection. In addition, we have proposed a tunable polarization volume grating based on the cholesteric bi-layer photonic crystal, which can diffract two specific light colors.

基于胆甾型液晶（CLC）的可调谐光子晶体因其可调谐的光学特性和自组装能力而备受关注。尽管各种基于胆甾型液晶的器件发展迅速，但胆甾型液晶的光子带隙带宽较窄，限制了它们在某些实际应用中的使用。本文介绍了一种在聚合物稳定胆固醇液晶（PSCLCs）中形成聚合物稳定和无聚合物胆固醇双层光子晶体的方法。通过调整反应性单体的浓度和控制紫外聚合条件，可以在单个 PSCLC 单元中形成两种不同的 PBG。当 RM257 的浓度增加到 40%、紫外光强度达到 22 mW/cm2 时，两条反射带之间的距离可达 200 nm，分别反射绿光和红光。研究了这些胆固醇双层结构在电场和温度变化下的动态形成过程和可调性。通过控制温度和电场，液晶层的反射率可从 50% 降低到 15%，从而实现单波段反射。此外，我们还提出了一种基于胆甾双层光子晶体的可调偏振体光栅，它可以衍射出两种特定的光色。

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Study of a fluorine-free silane-based film on an aluminum alloy via drop-coating method with the purpose of providing hydrophobic and corrosion protection properties 研究通过滴涂法在铝合金上形成无氟硅烷薄膜，以提供疏水和防腐蚀性能

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics

Pub Date : 2024-10-29 DOI: 10.1016/j.matchemphys.2024.130099

Rafael G.C. da Silva , Maria I.C. Malta , Jedaías J. da Silva , Walter L.C. da Silva Filho , Janaína A. Cirino , Sara H. de Oliveira , Glória M. Vinhas , Magda R.S. Vieira

This work sought to developed a fluorine-free, water-repellent silane-based film on 5052 aluminum alloy by studying the incorporation of Hexadecyltrimethoxysilane (HDTMS) into or over the silica gel film to protect against corrosion in a saline environment. Additionally, the interface of the silane-based film was studied using liquids such as soybean oil, diesel oil, and lubricating oil. Silica gel particles were deposited by dripping a solution of silica gel using design of experiment approach. The porosity of the silica gel film was assessed employing the potentiodynamic polarization technique. The condition of the more cohesive silica gel film was chemically modified by dripping a low concentration solution of HDTMS. The functionalized film on the aluminum alloy exhibited a contact angle of 136°, oleophilic behavior for soybean oil and lubricating oil, and superoleophilic character for diesel oil. Notably, hydrophobic film exhibited chemical (acid, alkaline, saline) and thermal stabilities (50–150 °C). The protective effect of the functionalized film against corrosion ions was confirmed by Electrochemical Impedance Spectroscopy in a saline solution over 7 days. These results suggest a fluorine-free alternative approach for thin film development and the study of its multifunctionality, including enhanced corrosion resistance, water-diesel oil separation, and potential applications in anti-fouling.

这项研究试图通过研究在硅胶膜中或硅胶膜上加入十六烷基三甲氧基硅烷 (HDTMS)，在 5052 铝合金上开发一种无氟、憎水的硅烷基薄膜，以防止在盐水环境中受到腐蚀。此外，还使用大豆油、柴油和润滑油等液体对硅烷基薄膜的界面进行了研究。采用实验设计法，通过滴入硅胶溶液沉积硅胶颗粒。采用电位极化技术评估了硅胶膜的孔隙率。通过滴入低浓度的 HDTMS 溶液，对更具内聚力的硅胶膜的条件进行了化学修饰。铝合金上的功能化薄膜的接触角为 136°，对豆油和润滑油具有亲油性，对柴油具有超亲油性。值得注意的是，疏水性薄膜具有化学稳定性（酸、碱、盐水）和热稳定性（50-150 °C）。电化学阻抗光谱法证实了功能化薄膜在盐溶液中 7 天对腐蚀离子的保护作用。这些结果为薄膜的开发和多功能性研究提供了一种无氟替代方法，包括增强耐腐蚀性、水-柴油分离以及在防污方面的潜在应用。

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引用次数: 0