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Ginkgo biloba-derived biogenic carbon quantum dots modified NiCo-LDH: Significantly enhanced energy density and cycle stability 源于银杏叶的生物碳量子点修饰镍钴锰酸锂:显著提高能量密度和循环稳定性
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-08 DOI: 10.1016/j.matchemphys.2024.130135
Yongzhi Lan , Rui Yu , Qing Wang , Yile Dai , Jianfeng Dai , Qi zhang
A significant development in the usage of hydroxides in energy storage applications is the creation of LDH materials with excellent electrical conductivity and structural stability. Due to their poor electrical conductivity, bimetallic layered double hydroxides have weak rate performance and limited cycling ability. To address these issues, carbon quantum dots derived from waste Ginkgo biloba and labeled as GBC were incorporated in the preparation of NiCo-LDH. With the many oxygen-containing functional groups on the surface, GBC increases the composite's wettability while maintaining the LDH lamellar structure. It can also create localized electron-rich regions, which give the material more space and channels for electron transport, improving electrical conductivity and rate performance. Furthermore, GBC is evenly dispersed throughout the LDH skeleton, giving the composites a homogenous surface state that can mitigate the structural collapse issue brought on by the volume change during cycling. The findings demonstrate that by modulating the amount of GBC, NiCo-LDH/GBC-20 performs better electrochemically than NiCo-LDH. The capacity was 276.1 mAh g−1 at 1 A g−1, an 84.1 % improvement over NiCo-LDH. Finally, the energy density displayed by the NiCo-LDH/GBC-20//AC HSC device is 72.5 Wh kg-1 (at 798.7 W kg−1), and maintains 78.2 % of its original capacity after 12,000 cycles.
氢氧化物在储能应用中的一个重要发展是创造出了具有优异导电性和结构稳定性的 LDH 材料。由于导电性差,双金属层状双氢氧化物的速率性能较弱,循环能力有限。为了解决这些问题,我们在制备 NiCo-LDH 时加入了从废弃银杏叶中提取的碳量子点,并标记为 GBC。GBC 表面有许多含氧官能团,在保持 LDH 片层结构的同时,还能提高复合材料的润湿性。它还能形成局部电子富集区,为材料提供更多的电子传输空间和通道,从而提高导电性和速率性能。此外,GBC 均匀地分散在整个 LDH 骨架中,使复合材料具有均匀的表面状态,从而缓解了循环过程中体积变化带来的结构坍塌问题。研究结果表明,通过调节 GBC 的用量,NiCo-LDH/GBC-20 的电化学性能优于 NiCo-LDH。在 1 A g-1 的条件下,容量为 276.1 mAh g-1,比 NiCoLDH 提高了 84.1%。最后,NiCo-LDH/GBC-20//AC HSC 器件的能量密度为 72.5 Wh kg-1(798.7 W kg-1),在循环 12,000 次后仍能保持 78.2% 的原始容量。
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引用次数: 0
Corrosion resistance properties and hydrogen embrittlement protection efficiency of single-layer and multi-layer metal and ceramic films deposited on SS316L substrates 沉积在 SS316L 基材上的单层和多层金属和陶瓷膜的耐腐蚀性能和氢脆保护效率
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-08 DOI: 10.1016/j.matchemphys.2024.130129
Hsuan-Kai Lin , Xue-Yu Lu , Cian-Yu Hu , Kao-Shu Chuang , Jui-Hsiung Huang
Hydrogen is a promising source of clean energy. However, the tanks used to store hydrogen fuel are prone to hydrogen embrittlement and are thus at risk of stress cracking and catastrophic failure. Accordingly, this study deposited single-layer and double-layer Zr, Al, SiO2, Al2O3, Al@Al2O3, and Al@SiO2 films on 316L stainless steel substrates and examined their feasibility as protective coatings by measuring their anti-corrosion properties and hydrogen permeation currents. The results showed that the single-layer Al2O3 film had a higher corrosion resistance than the single-layer SiO2 film and bare 316L substrate. Among all the coatings, the Al@Al2O3 double-layer coating exhibited the highest protection efficiency of 95 %. Moreover, it showed the lowest hydrogen penetration current density (1.08 x 10−3 A/cm2), the longest hydrogen embrittlement time (16000 s), and the lowest hydrogen content (0.008 mol/cm3). In other words, the Al@Al2O3 double-layer coating combined superior corrosion resistance with excellent hydrogen permeation suppression. Consequently, it is a promising material for enhancing the safety and longevity of hydrogen storage tanks in practical applications.
氢是一种前景广阔的清洁能源。然而,用于储存氢燃料的储罐容易发生氢脆,从而面临应力开裂和灾难性失效的风险。因此,本研究在 316L 不锈钢基底上沉积了单层和双层 Zr、Al、SiO2、Al2O3、Al@Al2O3 和 Al@SiO2 薄膜,并通过测量它们的防腐蚀性能和氢渗透电流,考察了它们作为保护涂层的可行性。结果表明,单层 Al2O3 膜的耐腐蚀性高于单层 SiO2 膜和裸 316L 基材。在所有涂层中,Al@Al2O3 双层涂层的保护效率最高,达到 95%。此外,它还显示出最低的氢穿透电流密度(1.08 x 10-3 A/cm2)、最长的氢脆时间(16000 秒)和最低的氢含量(0.008 mol/cm3)。换句话说,Al@Al2O3 双层涂层兼具优异的耐腐蚀性和出色的氢渗透抑制能力。因此,在实际应用中,该材料有望提高储氢罐的安全性和使用寿命。
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引用次数: 0
Study of Pr doped nanocrystalline LiCoO2 cathode material for spintronic and energy storage applications: A theoretical and experimental analysis 用于自旋电子和储能应用的掺镨纳米晶 LiCoO2 阴极材料研究:理论与实验分析
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-08 DOI: 10.1016/j.matchemphys.2024.130133
Ahmad Usman , G. Murtaza , Muhammad Younas , Ali Akremi , Ahmad Ayyaz , Haya Alhummiany , Syed Kashif Ali , Kanza Altaf , Hisham S.M. Abd-Rabboh , Sadia Sharif , Q. Mahmood
In this study, Pr3+ substituted LiCoO2 lithium-rich cathode materials were prepared using the sol-gel auto-combustion technique to enhance cycling performance. LiCo1-xPrxO2 samples having Pr concentrations x = 0.00–0.10 were synthesized. X-ray diffraction (XRD) showed a rhombohedral structure with space group R-3m, further verified by the Rietveld refinement. Field emission scanning electron microscopy (FESEM) revealed the presence of distinct and well-defined submicron-scale grains. FTIR spectroscopy confirmed Co–O stretching bonds within 590–560 cm−1 and revealed peaks at around 560–590, 830–860, and 1320-1480 cm−1, which could be attributed to the electrochemical performance of Pr-doped species. Moreover, EDX spectroscopy confirmed the typical elemental peaks of only Co, Pr, and O, confirming the required phase presence. The cyclic voltammetry showed improved reversibility and stability due to Pr doping. The first-principles computations were performed using the lattice constant extracted from XRD measurements. The pure LiCoO2 with a semiconducting nature became half-metallic due to Pr doping (LiCo0.84Pr0.16O2). The magnetic properties indicate that LiCoO2 and LiCo0.84Pr0.16O2 exhibit positive magnetic order, which shows that these are suitable candidates for spintronic applications. The pure LiCoO2 revealed intercalation voltages of 4.10–2.73V and a theoretical capacity 40–203 mAh/g. Meanwhile, for LiCo0.84Pr0.16O2, the intercalation voltages and theoretical capacity improved to 4.42–2.85 V and 42 to 211 mAh/g, respectively. The combined experimental and theoretical study suggests that Pr-doped LiCoO2 is suitable for spintronic applications and energy applications such as composite cathodes.
本研究采用溶胶-凝胶自燃烧技术制备了 Pr3+ 取代的 LiCoO2 富锂正极材料,以提高循环性能。合成了 Pr 浓度 x = 0.00-0.10 的 LiCo1-xPrxO2 样品。X 射线衍射 (XRD) 显示出空间群为 R-3m 的斜方体结构,并通过里特维尔德细化得到进一步验证。场发射扫描电子显微镜(FESEM)显示了清晰明确的亚微米级晶粒。傅立叶变换红外光谱证实了 590-560 cm-1 范围内的 Co-O 伸展键,并在 560-590、830-860 和 1320-1480 cm-1 附近发现了峰值,这些峰值可能与掺杂 Pr 的物种的电化学性能有关。此外,EDX 光谱证实了只有 Co、Pr 和 O 的典型元素峰,证实了所需相的存在。循环伏安法显示,由于掺杂了 Pr,可逆性和稳定性得到了改善。利用从 XRD 测量中提取的晶格常数进行了第一原理计算。由于掺杂了 Pr,具有半导体性质的纯 LiCoO2 变成了半金属(LiCo0.84Pr0.16O2)。磁性能表明,钴酸锂和钴酸锂 0.84Pr0.16O2 具有正磁序,适合用于自旋电子应用。纯钴酸锂的插层电压为 4.10-2.73V,理论容量为 40-203 mAh/g。同时,钴酸锂 0.84Pr0.16O2 的插层电压和理论容量分别提高到 4.42-2.85 V 和 42-211 mAh/g。综合实验和理论研究表明,掺镨钴酸锂适用于自旋电子应用和复合阴极等能源应用。
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引用次数: 0
A novel approach for Tool-Narayanaswamy-Moynihan model parameter extraction using multi-scale neural model 利用多尺度神经模型提取 Tool-Narayanaswamy-Moynihan 模型参数的新方法
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-07 DOI: 10.1016/j.matchemphys.2024.130107
Marek Pakosta , Petr Dolezel , Roman Svoboda
The accurate determination of parameters in the Tool-Narayanaswamy-Moynihan (TNM) model, which describes the viscoelastic behavior of glass-forming materials, is crucial for predicting material responses through various thermal histories. Traditional methods rely heavily on curve-fitting techniques; however, these often fail due to noise in the data. Furthermore, traditional methods are computationally intensive and prone to inaccuracies, particularly when dealing with complex datasets or when the initial parameter guesses are far from optimal; also, they require a skilled personnel.
In this study, we propose the application of a multi-scale convolutional neural network (MCNN) as a machine learning approach to address these challenges. The MCNN model is trained on a comprehensive simulated dataset encompassing a wide range of TNM parameters, allowing it to learn intricate patterns and dependencies within the data that are difficult to capture with conventional methods. Our results show that the MCNN significantly improves the accuracy of the parameter estimations for β and x across the entire spectrum of tested conditions, achieving performance that is not only comparable to, but often surpasses, traditional curve-fitting methods. Furthermore, the MCNN demonstrates superior robustness when initial parameter estimates are suboptimal or when the dataset exhibits significant noise. Although the prediction accuracy for the activation energy Δh and the pre-exponential factor log(A) was somewhat lower, the method still provides valuable estimates that can be refined with supplementary techniques.
This work highlights the potential of machine learning approaches like MCNN to revolutionize the parameter extraction process in complex physical models, reducing the reliance on manual curve-fitting and providing a more automated, scalable solution. We also analyze the primary sources of prediction errors in the MCNN outputs and offer insights into future improvements, including model architecture refinements and the integration of additional physical constraints. Our findings suggest that this approach can be extended to other domains where similar models are employed, paving the way for broader applications of machine learning in materials science.
Tool-Narayanaswamy-Moynihan (TNM) 模型描述了玻璃成型材料的粘弹性行为,准确确定该模型的参数对于预测材料在各种热历史条件下的响应至关重要。传统方法在很大程度上依赖于曲线拟合技术;然而,由于数据中存在噪声,这些方法往往会失败。此外,传统方法计算量大,容易出现误差,特别是在处理复杂数据集或初始参数猜测远非最优时;而且,这些方法需要熟练的人员。在本研究中,我们提出应用多尺度卷积神经网络(MCNN)作为机器学习方法来应对这些挑战。MCNN 模型是在包含各种 TNM 参数的综合模拟数据集上进行训练的,这使它能够学习到传统方法难以捕捉的数据中错综复杂的模式和依赖关系。我们的研究结果表明,MCNN 显著提高了在所有测试条件下对β和x 参数估计的准确性,其性能不仅可与传统的曲线拟合方法相媲美,而且往往超过后者。此外,当初始参数估计不理想或数据集出现明显噪声时,MCNN 也表现出了卓越的鲁棒性。虽然活化能Δh∗ 和前指数因子 log(A) 的预测准确率略低,但该方法仍能提供有价值的估计值,并可通过辅助技术加以完善。这项工作凸显了 MCNN 等机器学习方法在彻底改变复杂物理模型参数提取过程方面的潜力,减少了对人工曲线拟合的依赖,提供了更加自动化、可扩展的解决方案。我们还分析了 MCNN 输出中预测误差的主要来源,并对未来的改进提出了见解,包括模型架构的完善和额外物理约束条件的整合。我们的研究结果表明,这种方法可以扩展到采用类似模型的其他领域,为机器学习在材料科学领域的更广泛应用铺平道路。
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引用次数: 0
Preparation of Bi2CrO6/CuO heterostructure nanocomposite to increase methylene blue decomposition under visible light irradiation 制备 Bi2CrO6/CuO 异质结构纳米复合材料,提高可见光照射下亚甲基蓝的分解率
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-06 DOI: 10.1016/j.matchemphys.2024.130118
Vida Elyasi, Yaser Shaveisi, Shahram Sharifnia
In this study, the Bi2CrO6/CuO nanocomposite was used for the photocatalytic degradation of methylene blue (MB) under visible light. Nanocomposites with different ratios (1:1, 1:2, 2:1) were synthesized under hydrothermal conditions and investigated for MB removal. Various characterization techniques, including XRD, FT-IR, FE-SEM, BET, DRS, PL, and EDS, were employed to elucidate the physicochemical aspects of the catalysts. The 2:1 nanocomposite ratio was selected as the photocatalyst with the highest removal efficiency (85 %). Four main factors, including initial concentration, solution pH, catalyst dose, and light intensity, were studied using the response surface methodology (RSM) and the Box-Behnken model. Under optimal conditions, the MB removal efficiency reached 90.06 %. Additionally, the effect of oxidizing agents (H2O2) on the enhanced removal of MB was investigated. The improved photocatalytic performance of the Bi2CrO6/CuO (2:1) nanocomposite is attributed to visible light absorption, the formation of a p-n heterostructure, efficient charge separation via the S-scheme mechanism, and increased charge carrier lifetime. Moreover, economic calculations showed that the estimated costs for the photocatalytic removal of MB from wastewater are cost-effective.
本研究利用 Bi2CrO6/CuO 纳米复合材料在可见光下光催化降解亚甲基蓝(MB)。在水热条件下合成了不同比例(1:1、1:2、2:1)的纳米复合材料,并研究了其去除甲基溴的性能。采用了各种表征技术,包括 XRD、FT-IR、FE-SEM、BET、DRS、PL 和 EDS,以阐明催化剂的物理化学方面。结果表明,2:1 纳米复合比例的光催化剂具有最高的去除效率(85%)。利用响应面方法(RSM)和箱-贝肯模型研究了四个主要因素,包括初始浓度、溶液 pH 值、催化剂剂量和光照强度。在最佳条件下,甲基溴的去除率达到了 90.06%。此外,还研究了氧化剂(H2O2)对提高甲基溴去除率的影响。Bi2CrO6/CuO (2:1) 纳米复合材料光催化性能的提高归因于对可见光的吸收、p-n 异质结构的形成、通过 S 型机制实现的高效电荷分离以及电荷载流子寿命的延长。此外,经济计算表明,光催化去除废水中甲基溴的估计成本具有成本效益。
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引用次数: 0
Sulfur-doped g-C3N4/Polycaprolactone nanofibers based smart sensor for 8-hydroxy-2′-deoxyguanosine biomarker monitoring 基于掺硫 g-C3N4/Polycaprolactone 纳米纤维的智能传感器,用于监测 8-羟基-2′-脱氧鸟苷生物标记物
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-05 DOI: 10.1016/j.matchemphys.2024.130120
Waleed A. El-Said , Deia A. El-Hady , Wael Alshitari , Ziya A. Khan , Naeem Akhtar , Yusuke Yamauchi
The compound 8-hydroxy-2′-deoxyguanosine (8-OHdG) is a key byproduct of oxidative DNA damage and is widely recognized as an important biomarker for assessing DNA oxidation levels. This study presents a label-free, low-cost, smart sensor that can improve evaluation, tracking, and survival rates by allowing for an early assessment of cancer. Herein, we fabricate sulfur-doped graphitic carbon nitride (S-gC₃N₄) embedded in polycaprolactone (PCL) for highly efficient monitoring of 8-OHdG. The S-gC3N4 offers functional groups such as sulfur and nitrogen that facilitate strong binding interactions with 8-OHdG. Comprehensive techniques are utilized to investigate the S-gC3N4/PCL nanocomposite. Interestingly, the S-gC3N4/PCL nanocomposite demonstrates strong electrochemical responses to the oxidation of 8-OHdG, with a low detection limit across a wide dynamic concentration range (1 nM–50 μM). Additionally, it exhibits good durability, selectivity, reusability, and repeatability. The developed sensor has the potential to quantify 8-OHdG levels in individuals and can be used to evaluate oxidative DNA damage and risk factor for cancer. Furthermore, the S-gC₃N₄/PCL-based sensor is successfully tested to determine 8-OHdG levels in human serum samples.
化合物 8-羟基-2′-脱氧鸟苷(8-OHdG)是 DNA 氧化损伤的主要副产物,被公认为评估 DNA 氧化水平的重要生物标志物。本研究提出了一种无标记、低成本的智能传感器,通过对癌症进行早期评估,可以提高评估、跟踪和存活率。在本文中,我们制作了嵌入聚己内酯(PCL)的掺硫氮化石墨(S-gC₃N₄),用于高效监测 8-OHdG。S-gC3N4 具有硫和氮等功能基团,可促进与 8-OHdG 的强结合相互作用。我们利用综合技术对 S-gC3N4/PCL 纳米复合材料进行了研究。有趣的是,S-gC3N4/PCL 纳米复合材料对 8-OHdG 的氧化反应具有很强的电化学响应,在很宽的动态浓度范围(1 nM-50 μM)内检测限很低。此外,它还具有良好的耐用性、选择性、可重复使用性和可重复性。所开发的传感器具有量化个人体内 8-OHdG 水平的潜力,可用于评估氧化 DNA 损伤和癌症风险因素。此外,基于 S-gC₃N₄/PCL 的传感器还成功地测定了人体血清样本中的 8-OHdG 水平。
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引用次数: 0
Study on the corrosion resistance of KH570 modified titanium oxide coating synthesized at low temperature on 304 stainless steel 低温合成的 KH570 改性氧化钛涂层对 304 不锈钢的耐腐蚀性研究
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-05 DOI: 10.1016/j.matchemphys.2024.130126
Jiangang Wang , Zhe Wang , Rui Wu , Xin Zhang , Wei Luo , Lei Wang , Jingjing Wang
To address the corrosion susceptibility of 304 stainless steel in chloride-containing environments, we employed a sol-gel method to prepare silica-modified amorphous titanium oxide (TiO2) coatings with varying concentrations of KH570. The surface morphology and microstructure of the coatings were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Wettability was assessed through contact angle measurements, while corrosion resistance was evaluated via electrochemical methods and immersion corrosion tests. The results demonstrated that KH570 modification resulted in a more uniform, smoother, and denser coating surface. Notably, Ti–O–Si bonds were detected within the coating structure, with the surface transitioning from hydrophilic (contact angle of 70°) to hydrophobic (contact angle of 122°). However, increasing the concentration of KH570 adversely affected corrosion resistance due to surface roughening and diminished hydrophobicity. Excess KH570 led to incomplete grafting on the TiO2 particles, resulting in uneven aggregation. Compared to unmodified TiO2 coatings, the KH570-modified coatings exhibited significantly enhanced hydrophobicity, with the water contact angle of TiO2 coatings containing 10 vol% KH570 increasing from 70° to 122°. Additionally, the KH570-modified coating demonstrated excellent corrosion resistance, characterized by a corrosion current density of 0.036 μA/cm2, which is two orders of magnitude lower than that of the unmodified TiO2 coating. Furthermore, it exhibited the highest charge transfer resistance, indicating improved electrochemical stability.
为了解决 304 不锈钢在含氯环境中易腐蚀的问题,我们采用溶胶-凝胶法制备了不同浓度 KH570 的二氧化硅改性无定形氧化钛 (TiO2) 涂层。使用扫描电子显微镜(SEM)、能量色散 X 射线光谱(EDS)、傅立叶变换红外光谱(FTIR)和 X 射线光电子能谱(XPS)对涂层的表面形态和微观结构进行了表征。润湿性通过接触角测量进行评估,耐腐蚀性则通过电化学方法和浸泡腐蚀试验进行评估。结果表明,KH570 的改性使涂层表面更加均匀、光滑和致密。值得注意的是,涂层结构中检测到了 Ti-O-Si 键,表面从亲水(接触角 70°)过渡到疏水(接触角 122°)。然而,增加 KH570 的浓度会导致表面粗糙和疏水性降低,从而对耐腐蚀性产生不利影响。过量的 KH570 会导致 TiO2 颗粒上的接枝不完全,造成不均匀的聚集。与未改性的二氧化钛涂层相比,KH570 改性涂层的疏水性明显增强,含 10 vol% KH570 的二氧化钛涂层的水接触角从 70°增至 122°。此外,KH570 改性涂层还表现出优异的耐腐蚀性,腐蚀电流密度为 0.036 μA/cm2,比未改性的 TiO2 涂层低两个数量级。此外,它还表现出最高的电荷转移电阻,表明电化学稳定性得到了提高。
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引用次数: 0
Physics statistical analysis of crystal violet adsorption onto activated bamboo fiber powder: Insights from thermodynamic functions 活性竹纤维粉末吸附水晶紫的物理统计分析:热力学函数的启示
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-05 DOI: 10.1016/j.matchemphys.2024.130110
Amin Naifar , Mohamed Bouzid , Yosra ben Torkia , Abdelmottaleb ben lamine
This current research scrutinizes the adsorption behavior of Crystal Violeton Activated Bamboo Fiber Powder (ABFP)for water purification. By leveraging four advanced statistical physics scenarios (Hill framework with single energy, Hill framework with dual-energy, Double-layer framework with single energy and Double-layer framework with dual energy), experimental data is meticulously fitted to elucidate the surface adhesion phenomenon by uncovering its decisive influencing metrics.Four convergence criteria (R2, RMSE, AIC and RSS) have been employed to identify the most accurate model while steriographic along with energetic-thermodynamic metrics have been inspected in response to combined effects of temperature and concentration. Major outcomes revealed that the fourth scenario exhibits the most favorable agreement with the measured points. The spatial arrangement factor n varied from 0.58 to 0.75 indicating that the dye retention can occur via two different orientations (parallel and non-parallel) with different percentages. In addition, the adsorption amounts at temperatures of 298, 308 and 318 K were 1403.13, 1365.75 and 1270.79 mg/g, respectively, revealing the exothermicity of crystal violet adsorption onto the pores of Activated Bamboo Fiber Powder. The estimated docking energies were below 40 kJ/mol, suggesting that physical forces primarily govern the surface attachment. Assessment of enthalpy and Gibbs free energy demonstrated that the adsorption process occursfeasibly, spontaneously and is accompanied by heat release. The pore size distribution (PSD) of (ABFP) are determined. Since, the Activated Bamboo Fiber Powder (ABFP) showed promising results for competitive adsorption, thus being of relevance to the industrial sector.
本研究仔细研究了用于水净化的水晶紫罗兰活性竹纤维粉(ABFP)的吸附行为。通过利用四种先进的统计物理学方案(单能量希尔框架、双能量希尔框架、单能量双层框架和双能量双层框架),对实验数据进行了细致的拟合,以通过揭示其决定性的影响指标来阐明表面粘附现象。主要结果表明,第四种方案与测量点的吻合度最高。空间排列系数 n 从 0.58 到 0.75 不等,表明染料可通过两种不同的方向(平行和非平行)以不同的百分比保留。此外,在 298、308 和 318 K 温度下的吸附量分别为 1403.13、1365.75 和 1270.79 mg/g,表明活性竹纤维粉孔对结晶紫的吸附具有放热性。估计的对接能低于 40 kJ/mol,表明表面吸附主要受物理力的支配。焓和吉布斯自由能的评估结果表明,吸附过程是自发地发生的,并伴随着热量的释放。测定了活性竹浆纤维(ABFP)的孔径分布(PSD)。由于活性竹纤维粉(ABFP)在竞争性吸附方面表现出良好的效果,因此对工业领域具有重要意义。
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引用次数: 0
Multifunctional RGO-Gd2O3:Eu3+ nanocomposites for supercapacitor and biosensor application 用于超级电容器和生物传感器的多功能 RGO-Gd2O3:Eu3+ 纳米复合材料
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-05 DOI: 10.1016/j.matchemphys.2024.130128
Nandini Robin Nadar , J. Deepak , S.C. Sharma , B.R. Radha Krushna , H. Nagabhushana , Augustine George , Pushparaj Samantsinghar , A. Banu , D.G. Anand
This study successfully synthesized pristine RGO-Gd2O3:Eu3+ nanocomposites (NCs) using a hydrothermal method, as confirmed by X-ray diffraction and TEM analysis. Cyclic voltammetry (CV) demonstrated that RGO-Gd2O3:Eu3+ NCs exhibited a superior specific capacitance (Csp) of 340 Fg⁻1 at a scan rate of 2 mV s⁻1. Impressively, the synthesized nanocomposites displayed high energy and power densities of 41 Wh/kg and 30000 W/kg, respectively, along with excellent capacity retention (91.12 %) and Coulombic efficiency (95.77 %). Modified glassy carbon electrodes (MGCEs) fabricated using these NCs showed promising electrochemical responses for dopamine (DA) detection at pH∼7. These findings highlight the potential of the developed electrode for both supercapacitor applications and DA sensing.
本研究采用水热法成功合成了原始的 RGO-Gd2O3:Eu3+ 纳米复合材料(NCs),X 射线衍射和 TEM 分析证实了这一点。循环伏安法(CV)表明,在 2 mV s-1 的扫描速率下,RGO-Gd2O3:Eu3+ NCs 的比电容(Csp)高达 340 Fg-1。令人印象深刻的是,合成的纳米复合材料分别显示出 41 Wh/kg 和 30000 W/kg 的高能量和功率密度,以及出色的容量保持率(91.12%)和库仑效率(95.77%)。使用这些 NCs 制成的改性玻璃碳电极(MGCE)在 pH 值为 7 的条件下检测多巴胺(DA)时显示出良好的电化学响应。这些发现凸显了所开发电极在超级电容器应用和多巴胺传感方面的潜力。
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引用次数: 0
Experimental study on corrosion behavior and failure mechanism of bolts in acidic environment 酸性环境中螺栓腐蚀行为和失效机理的实验研究
IF 4.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-11-03 DOI: 10.1016/j.matchemphys.2024.130123
Shuaiqian Li, Zhaowen Du, Zhuoyue Wen
To investigate the corrosion resistance and failure process of various metal bolts within acidic environment. The comparative corrosion experiment was conducted on ordinary, zinc-immersed, and zinc-infiltrated bolts. The corrosion behavior and mechanism were analyzed in these three types of bolts. The results showed that within an acidic milieu, the corrosion resistance of ordinary bolt is notably inferior, succeeded by zinc-immersed bolts, and the zenith of corrosion resistance is observed in zinc-infiltrated bolts. The instantaneous corrosion rate constants for these bolts are found to be 0.25026, −0.19605, and −0.06209, respectively. After 100 days of corrosion, the degradation in mechanical properties for the three bolts manifested as the yield strength decreased by 6.50 %, 4.63 %, and 2.85 %, respectively, and the tensile strength decreased by 6.37 %, 3.99 %, and 1.45 %, respectively, and the elongation decreased by 15.85 %, 12.20 %, and 7.97 %, respectively. As the corrosion advanced, the tensile fracture behavior of ordinary bolt transitions from ductile fracture to ductile-brittle hybrid fracture, the tensile fracture behavior of zinc-immersed and zinc-infiltrated bolts remains ductile fracture. The corrosion process for the ordinary bolt follows dissolution-destruction mechanism, the zinc-immersed bolt follows dissolution-destruction-penetration mechanism, and the zinc-infiltrated bolt follows dissolution-transformation mechanism.
研究各种金属螺栓在酸性环境中的耐腐蚀性和失效过程。对普通螺栓、浸锌螺栓和渗锌螺栓进行了腐蚀对比实验。分析了这三种螺栓的腐蚀行为和机理。结果表明,在酸性环境中,普通螺栓的耐腐蚀性能明显较差,浸锌螺栓次之,而浸锌螺栓的耐腐蚀性能达到顶峰。这些螺栓的瞬时腐蚀速率常数分别为 0.25026、-0.19605 和 -0.06209。腐蚀 100 天后,三种螺栓的机械性能下降,屈服强度分别下降了 6.50 %、4.63 % 和 2.85 %,抗拉强度分别下降了 6.37 %、3.99 % 和 1.45 %,伸长率分别下降了 15.85 %、12.20 % 和 7.97 %。随着腐蚀的加剧,普通螺栓的拉伸断裂行为从延性断裂过渡到延脆混合断裂,浸锌和渗锌螺栓的拉伸断裂行为仍为延性断裂。普通螺栓的腐蚀过程遵循溶解-破坏机理,浸锌螺栓遵循溶解-破坏-渗透机理,而渗锌螺栓遵循溶解-转化机理。
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Materials Chemistry and Physics
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