Nano-Structures & Nano-Objects最新文献_第10页

Investigation of thermal efficiency in SWCNT and MWCNT hybrid nanofluids under transient convection between parallel plates 平行板间瞬态对流下swcnts和MWCNT混合纳米流体热效率的研究

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-08-01 DOI: 10.1016/j.nanoso.2025.101522

Praveenkumar Badiger , Madhavarao Kulkarni , Praveen Jakkannavar

Transient magnetohydrodynamic convection, that entails the flow of single wall carbon nanotube (SWCNT) and multiwall carbon nanotube (MWCNT)/water (H2O) hybrid nanofluid between two parallel plates, has several applications in science and engineering. In particular, coatings for wires, fibre sheets, optical fibres, photoelectric devices, and solar cells are designed and manufactured. The effects of an external magnetic field on fluid transport properties are investigated. The thermal efficiency behavior of various nanoparticle form factors is investigated. This study looks into flow concerns such as convection, hybrid nanofluid properties, and the applied magnetic field. Fluid flow is represented mathematically by coupled partial differential equations with specified boundary circumstances. The finite difference method is being used in conjunction with the appropriate analogous transformations to convert the governing equations into dimensionless form. Better heat transfer is obtained when hybrid nanoparticles are added to base liquid as opposed to base fluid and nanofluid alone, according to simulations for different physical parameters in the model. Greater values of the velocity ratio and combination of convection parameters result in a rise in the hybrid nanofluid's velocity. As the magnetic parameter and volume fraction of SWCNT-MWCNT grows, temperature of hybrid nanofluid rises sharply.

瞬态磁流体动力学对流是指单壁碳纳米管（SWCNT）和多壁碳纳米管(MWCNT)/水（H2O）混合纳米流体在两个平行板之间的流动，在科学和工程上有许多应用。特别是电线、纤维片、光纤、光电器件和太阳能电池的涂层的设计和制造。研究了外加磁场对流体输运特性的影响。研究了不同形状的纳米颗粒的热效率行为。本研究着眼于流动问题，如对流、混合纳米流体性质和外加磁场。流体流动用具有特定边界条件的耦合偏微分方程在数学上表示。将有限差分法与适当的类似变换相结合，将控制方程转化为无量纲形式。根据模型中不同物理参数的模拟，混合纳米颗粒加入基液比单独加入基液和纳米流体获得更好的传热效果。流速比和对流参数组合的值越大，混合纳米流体的速度越快。随着swcnts - mwcnt的磁性参数和体积分数的增大，杂化纳米流体的温度急剧升高。

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引用次数: 0

Design and energy storage behavior of conductive polymer-nickel ferrite nanocomposites 导电聚合物-镍铁氧体纳米复合材料的设计与储能性能

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-07-25 DOI: 10.1016/j.nanoso.2025.101520

Süleyman Kerli , Ali Kemal Soğuksu , Ümit Alver

In this study, a new composite material was developed by coating polyaniline (PANI) onto hydrothermally synthesized nickel ferrite via oxidative polymerization. Structural and chemical properties were characterized using XRD, SEM, XPS, and FTIR. XRD confirmed the crystalline phases, while SEM revealed the surface morphology. XPS demonstrated successful incorporation into PANI, particularly by determining the oxidation states of Ni and Fe. FTIR evaluated the bonding between the components. Electrochemical performance was investigated using CV tests at scan rates of 10–100 mV s⁻¹ and GCD tests at current densities of 20–80 mA cm⁻². The annealed nickel ferrite-PANI composite exhibited a high areal capacitance of 17.76 F.cm⁻² at 20 mA cm⁻². It also demonstrated good rate capability and cycling stability. EIS analysis revealed that this electrode has a low impedance, particularly in the low-frequency region, allowing for faster charge transfer and ion diffusion. In conclusion, the combination of heat-treated nickel ferrite and conductive PANI creates an electrode material with superior energy storage properties.

本研究将聚苯胺（PANI）通过氧化聚合涂覆在水热合成的铁氧体镍上，制备了一种新型复合材料。采用XRD、SEM、XPS和FTIR对其结构和化学性质进行了表征。XRD证实了晶体相，SEM显示了表面形貌。XPS证明了与聚苯胺的成功结合，特别是通过测定Ni和Fe的氧化态。FTIR评估了组分之间的结合。用扫描速率为10-100 mV s⁻¹ 的CV测试和电流密度为20-80 mA cm⁻²的GCD测试来研究电化学性能。退火后的铁素体镍-聚苯胺复合材料具有17.76 F的高面电容。cm⁻²在20 mA cm⁻²。同时也表现出良好的速率性能和循环稳定性。EIS分析表明，该电极具有低阻抗，特别是在低频区域，允许更快的电荷转移和离子扩散。总之，热处理镍铁氧体和导电聚苯胺的组合创造了一种具有优异储能性能的电极材料。

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引用次数: 0

Esterified cellulose-based quasi-solid electrolyte assembly for potential application in efficient dye-sensitized solar cell 基于酯化纤维素的准固体电解质组件在高效染料敏化太阳能电池中的潜在应用

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-07-10 DOI: 10.1016/j.nanoso.2025.101514

Maneesh Kumar , Praveen K. Surolia , Gayatri Prasad

This study explores the development of a quasi-solid electrolyte assembly using cellulose and phthalated cellulose for dye-sensitized solar cells (DSSC). The fabricated DSSC, incorporating phthalated cellulose, an ionic liquid ([Bmim]I), and an I₃⁻/I⁻ redox shuttle, achieved a photo-conversion efficiency of 5.86 % under a light intensity of 100 mW·cm⁻². It is a noteworthy improvement over most other quasi-solid-state systems, typically with the performance in the range of ∼4.5–5.2 %, underlining it potential for designing energy devices using sustainability. The enhanced efficiency of this quasi-solid-state DSSC is attributed to improved ionic conductivity, resulting from the increased oxygen atoms in the grafted cellulose. These oxygen atoms interact with cationic moieties, facilitating a hopping mechanism that allows free anionic moieties to drive the redox couple. This research highlights the potential of biopolymer-based quasi-solid electrolytes, paving the way for sustainable, green photoconversion in DSSC technology.

本研究探索了利用纤维素和邻苯二甲酸盐纤维素制备染料敏化太阳能电池（DSSC）的准固体电解质组件。这种合成的DSSC包含了一种离子液体（[Bmim]I）和一个I₃⁻/I⁻还原穿梭体，在100 mW·cm⁻²的光强下，其光转化效率达到了5.86 %。与大多数其他准固态系统相比，这是一个值得注意的改进，通常性能在~ 4.5-5.2 %的范围内，强调了它在设计可持续性能源设备方面的潜力。这种准固态DSSC效率的提高归因于离子电导率的提高，这是由于接枝纤维素中氧原子的增加。这些氧原子与阳离子部分相互作用，促进跳跃机制，使自由的阴离子部分驱动氧化还原偶对。这项研究强调了基于生物聚合物的准固体电解质的潜力，为DSSC技术的可持续绿色光转换铺平了道路。

引用次数: 0

The impact of pH on the size of biosynthesized silver nanoparticles: Evaluation of antioxidant and antibacterial activities pH值对生物合成银纳米颗粒大小的影响：抗氧化和抗菌活性的评价

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-09-09 DOI: 10.1016/j.nanoso.2025.101545

Khadija Elouardy , Mustapha Mouzaki , Hassan Ahmoum , Asmaa Akhrouf , Abdessamad Faik , Youssef Mir

This study reports the green synthesis of silver nanoparticles (AgNPs) using the microalga Scenedesmus sp. and their characterization via UV-Vis spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). AgNPs were synthesized at pH values of 4, 7, and 10 and analyzed for size and stability using dynamic light scattering (DLS). Mean particle sizes were 223 nm (pH 4), 122 nm (pH 7), and 60 nm (pH 10), with spherical morphologies observed via SEM. Zeta potential measurements indicated increased colloidal stability at higher pH. AgNPs synthesized at alkaline pH (60 nm) demonstrated enhanced antimicrobial activity against Acinetobacter baumannii ATCC196306, Escherichia coli ATCC35218, Staphylococcus aureus ATCC29213, and Pseudomonas aeruginosa ATCC27853, compared to larger nanoparticles. Similarly, antioxidant assays revealed higher activity for these smaller nanoparticles. These results suggest that pH-controlled green synthesis can produce AgNPs with optimized antimicrobial and antioxidant properties, highlighting their potential applications in biomedical fields.

本研究报道了利用微藻Scenedesmus sp.绿色合成银纳米粒子（AgNPs），并通过紫外可见光谱、x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）对其进行了表征。在pH值为4、7和10的条件下合成AgNPs，并利用动态光散射（DLS）分析AgNPs的尺寸和稳定性。平均粒径为223 nm (pH 4), 122 nm （pH 7）和60 nm (pH 10)，通过扫描电镜观察到球形形貌。Zeta电位测量表明，在较高的pH值下，胶体稳定性增加。与较大的纳米颗粒相比，在碱性pH（60 nm）下合成的AgNPs显示出对鲍曼不动杆菌ATCC196306、大肠杆菌ATCC35218、金黄色葡萄球菌ATCC29213和铜绿假单胞菌ATCC27853的抗菌活性增强。同样，抗氧化实验显示这些小颗粒具有更高的活性。这些结果表明，ph控制绿色合成可以制备出具有最佳抗菌和抗氧化性能的AgNPs，突出了其在生物医学领域的潜在应用前景。

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引用次数: 0

Solid-state synergy: Sulfur cathodes, engineered interfaces, and doping innovations for next-gen batteries 固态协同：硫阴极、工程界面和下一代电池的掺杂创新

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-09-11 DOI: 10.1016/j.nanoso.2025.101544

Caryn Niangnunnuam , Balasubramanian Kandasubramanian

This review examined Sulfur-based Batteries that possess all-solid-state (ASS) as cutting-edge conservation of energy technologies that offer remarkable theoretical capacity (1675 mAh g⁻¹), enhanced safety, and cost-effectiveness. By employing solid electrolytes based on sulfide, as Li₆PS₅Cl and Li₇P₃S₁₁, ASSBs overcome challenges faced by traditional Li–S batteries, including polysulfide shuttling and flammability. However, interfacial instability, dendrite growth, and mechanical degradation remain key limitations. To address these, researchers have introduced doping strategies (e.g., N, Se, Te, Co, W, Cl, Ta) and engineered sulfur cathodes with carbon frameworks. Notable performances include N-doped carbon–sulfur cathodes with 1145.9 mAh g⁻¹ initial capacity contrast to 88.14 % of storage capacity 100 cycles later, and Se-doped cathodes with 473.8 mAh g⁻¹ and 99.4 % retention. Electrolyte enhancements exhibit conductivities of up to 6.4 mS/cm. Mechano-electrochemical stability is enhanced by utilising flexible polymers and cross-linked structures, thereby reducing stress and maintaining conductive pathways. These advances have enabled ASSBs to accomplish energy intensity up to 2600 Wh kg⁻¹ , rapid charging, and reliable operation at −40 °C, making them ideal for electric vehicles, aerospace, and grid storage. Ongoing efforts in interfacial design, AI-assisted material discovery, and scalable fabrication are essential for commercial realisation.

这篇综述研究了硫基电池作为一种具有全固态（ASS）的尖端节能技术，它提供了惊人的理论容量（1675 mAh g⁻¹），增强了安全性和成本效益。通过采用基于硫化物的固体电解质，如Li₆PS₅Cl和Li₇P₃S₁₁，assb克服了传统Li - S电池面临的挑战，包括多硫化物穿梭和可燃性。然而，界面不稳定性、枝晶生长和机械降解仍然是主要的限制。为了解决这些问题，研究人员引入了掺杂策略（例如，N, Se, Te, Co， W, Cl, Ta）和带有碳框架的工程硫阴极。值得注意的性能包括n掺杂碳硫阴极的初始容量为1145.9 mAh g⁻¹ ，而100次循环后的存储容量为88.14 %，硒掺杂阴极的存储容量为473.8 mAh g⁻¹ ，保留率为99.4 %。电解质增强表现出高达6.4 mS/cm的电导率。利用柔性聚合物和交联结构增强了机械电化学稳定性，从而减少了应力并保持了导电途径。这些进步使assb能够实现高达2600 Wh kg⁻¹ 的能量强度，快速充电和在- 40°C下的可靠运行，使其成为电动汽车，航空航天和电网存储的理想选择。在界面设计、人工智能辅助材料发现和可扩展制造方面的持续努力对商业实现至关重要。

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引用次数: 0

Graphene oxide-based smart sensors: Synthesis, functionalization strategies, and biosensing applications 基于氧化石墨烯的智能传感器：合成、功能化策略和生物传感应用

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 DOI: 10.1016/j.nanoso.2025.101532

Suleman Stephen Mshelia , Preeti Jain , Manju Gaur

Graphene oxide and its nanocomposites exhibit extensive surface coverage, exceptional conductivity, and excellent functionalization properties, making them a revolutionary platform for electrochemical biosensing. This review highlights the advancements made in the preparation and functionalization of GO-based nanocomposites and their hybridization with polymers, metal oxides, and noble metals, as well as biomolecules for developing sensitive sensing platforms. We describe covalent and non-covalent methods of functionalization, as well as hybrid systems and doping, which contribute to the selectivity, sensitivity, and stability of sensing techniques. Emphasis is placed on electrochemical graphene oxide-based sensors for biomolecules, heavy metals, pharmaceuticals, and disease biomarkers, with applications in medical, environmental, and food analysis. The aspects of characterization methods, material stability, and reproducibility, as well as real-world integration issues, along with emerging trends such as wearable and flexible sensors, and environment-friendly syntheses, aim to provide researchers working on the future of nano-carbon sensors with a basis for the fabrication of scalable, innovative materials for translation.

氧化石墨烯及其纳米复合材料具有广泛的表面覆盖，优异的导电性和优异的功能化性能，使其成为电化学生物传感的革命性平台。本文综述了氧化石墨烯基纳米复合材料的制备和功能化，以及它们与聚合物、金属氧化物、贵金属和生物分子的杂化，以开发灵敏的传感平台。我们描述了共价和非共价的功能化方法，以及杂化系统和掺杂，它们有助于传感技术的选择性，灵敏度和稳定性。重点放在电化学氧化石墨烯传感器为基础的生物分子，重金属，药物和疾病生物标志物，在医疗，环境和食品分析的应用。表征方法、材料稳定性和可重复性，以及现实世界的集成问题，以及可穿戴和柔性传感器、环境友好型合成等新兴趋势，旨在为研究纳米碳传感器未来的研究人员提供可扩展的、创新的翻译材料制造基础。

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引用次数: 0

Functionalization of 6-mercaptopyridine-3-carboxylic acid on gold nanoparticles for selective and sensitive detection of heavy metal cadmium 6-巯基吡啶-3-羧酸在金纳米粒子上的功能化选择性灵敏检测重金属镉

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-08-01 DOI: 10.1016/j.nanoso.2025.101521

Kizafa Aftab, Shahida Rashid, Jigneshkumar V. Rohit

Cadmium (Cd⁺²) is a hazardous heavy metal that can cause serious health problems, including cancer. Because of this, the World health organization (WHO) fixed the maximum allowed limit of Cd⁺² in drinking water or industrial wastewater is 3.0 µgL⁻¹. To accurately detect even lower concentration of Cd⁺², a reliable and easy-to-use method was developed by our group. Here in this work, simple and visual detection was proposed to detect Cd²⁺ ions by using 6-Mercaptopyridine-3-carboxylic acid functionalized gold nanoparticles (MPyC-AuNPs). The prepared MPyC-AuNPs were characterized by UV–visible spectrometry, dynamic light scattering (DLS), zeta potential and Fourier transform infrared spectroscopy (FT-IR). The characteristic surface plasmon resonance (SPR) peak of MPyC-AuNPs was observed at 524 nm, and the aggregation of MPyC-AuNPs leads to spectral change from 524 nm to 677 nm. The aggregation is due to the formation of the metal ligand coordination between MPyC-AuNPs and Cd²⁺ ions. Moreover, MPyC-AuNPs based sensor is highly selective for the detection of Cd²⁺ and giving response only for Cd²⁺ among tested metal ions. Under the optimal conditions, a good linear relationship (R² = 0.9956) was observed between the ratio of the extinction at 680 nm to that at 524 nm and the concentration of Cd²⁺ over the range of 1 µM - 100 µM. The detection limit was found to be 5.4 × 10⁻⁷µM, which is equal to 0.0607µgL⁻¹ lesser than the allowed limit by WHO. Moreover, the developed sensor was capable to detect Cd²⁺ from water samples with good recovery and lesser relative standard deviation. Thus MPyC-AuNPs proven as efficient sensors for the on-site monitoring of Cd²⁺ in water (tap, river and canal) samples.

镉（Cd+2）是一种危险的重金属，会导致严重的健康问题，包括癌症。因此，世界卫生组织（WHO）规定饮用水或工业废水中Cd+2的最大允许限量为3.0µgL−1。为了准确检测更低浓度的Cd+2，本课题组开发了一种可靠且易于使用的方法。本文提出了利用6-巯基吡啶-3-羧酸功能化金纳米粒子（MPyC-AuNPs）检测Cd2+离子的简单、直观的方法。采用紫外可见光谱、动态光散射（DLS）、zeta电位和傅里叶变换红外光谱（FT-IR）对制备的MPyC-AuNPs进行了表征。在524 nm处观察到MPyC-AuNPs的特征表面等离子体共振（SPR）峰，MPyC-AuNPs的聚集导致光谱从524 nm变化到677 nm。这种聚集是由于MPyC-AuNPs和Cd2+离子之间形成金属配体配位。此外，基于MPyC-AuNPs的传感器对Cd2+的检测具有高度选择性，并且在被测金属离子中仅对Cd2+做出响应。在最优条件下，在680 nm处消光比与524 nm处消光比与Cd2+浓度在1 µM ~ 100 µM范围内呈良好的线性关系（R2 = 0.9956）。检出限为5.4 × 10−7µM，比WHO标准低0.0607µgL−1。此外，所开发的传感器能够检测水样中的Cd2+，回收率好，相对标准偏差小。因此，MPyC-AuNPs被证明是现场监测水（自来水、河流和运河）样品中Cd2+的有效传感器。

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引用次数: 0

Insights into the floral senescence effects of nanoparticles 纳米粒子对花卉衰老的影响

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-06-10 DOI: 10.1016/j.nanoso.2025.101501

Vuk Uskoković

Flowers could be valuable addenda to nanomedicine labs as in vivo models crossing the gap between the cell culture and small mammals. However, as it is shown here, floral models continue to be predominantly utilized within resource-limited research environments and remain largely underrepresented in mainstream biomedical investigations conducted by well-funded institutions in the developed world. The ability to delay the senescence of Orange Jubilee wildflowers was tested here on three types of nanoparticles: selenite-doped hydroxyapatite (HAp), citrate-stabilized HAp, and superparamagnetic iron oxide. Integration of selenite into the HAp crystal lattice produced a mild increase in the senescence rate relative to HAp. Iron oxide nanoparticles produced nil effects on senescence when added as powders and marginal effects when delivered as colloids. Colloidal stabilization of HAp nanoparticles with citrates significantly extended the flower viability, which was due to the ability of citrates to: (i) disperse the nanoparticles and thus facilitate their penetration into herbal tissues via their upward transfer along the xylem, and (ii) impart moderate acidity to the medium and thus intrinsically inhibit the growth of bacteria that block the flower stem and obstruct the water uptake. Orange Jubilee flowers prove as a solid, albeit pleiotropic model for assessing the biological barrier permeation and antibacterial activity of colloids and fine powders. Quests for similar in vivo models may result in less ambiguous and more effective models for the preclinical assessment of nanoparticles for uses in biomedicine.

花可以作为纳米医学实验室有价值的补充，作为体内模型，跨越细胞培养和小型哺乳动物之间的差距。然而，正如这里所显示的，花卉模型仍然主要在资源有限的研究环境中使用，并且在发达国家资金充足的机构进行的主流生物医学研究中仍未得到充分代表。研究人员在三种类型的纳米颗粒上测试了延缓橙禧野花衰老的能力：亚硒酸盐掺杂羟基磷灰石（HAp）、柠檬酸盐稳定的HAp和超顺磁性氧化铁。亚硒酸盐与HAp晶格的结合使其衰老速率相对于HAp略有增加。氧化铁纳米颗粒作为粉末添加时对衰老没有影响，作为胶体递送时效果微乎其微。柠檬酸盐对HAp纳米颗粒的胶体稳定性显著延长了花的活力，这是由于柠檬酸盐的能力：(i)分散纳米颗粒，从而促进它们通过沿着木质部向上转移渗透到草药组织中；（ii）赋予介质适度的酸度，从而从本质上抑制阻碍花茎和阻碍水分吸收的细菌的生长。橙禧花被证明是一个固体的，尽管多效性模型，用于评估胶体和细粉末的生物屏障渗透和抗菌活性。寻求类似的体内模型可能会导致更少的模糊性和更有效的模型用于纳米颗粒在生物医学中的临床前评估。

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引用次数: 0

Darcy-Forchheimer dynamics of Cu-TiO2/H2O hybrid nanofluid flow over a nonlinearly stretching sheet with shape effect Cu-TiO2/H2O杂化纳米流体在具有形状效应的非线性拉伸薄片上流动的Darcy-Forchheimer动力学

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-08-22 DOI: 10.1016/j.nanoso.2025.101528

K. Sreelakshmi , R. Vijaya Lakshmi , G. Sarojamma , Ali J. Chamkha

The current study presents the physical perspectives on 3D hydromagnetic Darcy-Forchheimer stream of composite (

Ti O_{2} - Cu / H_{2} O

) and mono (

Cu - H_{2} O

) nanofluids over a nonlinear-elastic inclined sheet with the effects of the shape factor of nano materials and the convective heating. Previous research has looked at the effects of mixed nanofluid dynamics and porous media on their own, but not much has been done on how shape factor, Lorentz force, nonlinear stretching, and inclined geometry all work together in a Darcy–Forchheimer structure.The resulting ODEs are solved using the shooting mechanism in combination with the Runge-Kutta Fehlberg methodology. The influence of various emerging parameters on the velocity and temperature fields, frictional drag, and heat transfer rate is examined and illustrated graphically. The results reveal that the two-phase hybrid nanofluid exhibits higher velocity compared to that in the single-phase flow. The

x

and

y

components of the drag force on the surface in both phases decrease with the Grashof number, while an opposite trend occurs with the magnetic parameter. Moreover, the hybrid nanofluid demonstrates enhanced heat transfer rates and elevated temperature fields relative to the mono nanofluid. Among the nanoparticle shapes considered, blade-shaped nanomaterials produce higher temperatures and greater heat transfer rates in both fluids. When particles are blade-shaped, the Nusselt number increase is 7.6 % higher than when particles are spherical. These implications have practical relevance towards thermal design in the fields of biomedical thermal control devices, electronic cooling systems and industrial heat exchangers.

本文从物理角度研究了复合纳米流体（TiO2−Cu/H2O）和单纳米流体（Cu−H2O）在非线性弹性斜片上的三维水磁Darcy-Forchheimer流，研究了纳米材料形状因子和对流加热的影响。先前的研究着眼于混合纳米流体动力学和多孔介质本身的影响，但对形状因子、洛伦兹力、非线性拉伸和倾斜几何如何在达西-福希海默结构中共同作用的研究并不多。利用射击机制结合龙格-库塔-费贝格方法求解得到的ode。各种新出现的参数对速度和温度场、摩擦阻力和换热率的影响进行了检验和图解。结果表明，两相混合纳米流体相对于单相流体表现出更高的速度。两相表面阻力的x、y分量均随格拉什夫数的增加而减小，而随磁性参数的增加而减小。此外，与单一纳米流体相比，混合纳米流体表现出更高的传热率和更高的温度场。在考虑的纳米颗粒形状中，叶片形状的纳米颗粒在两种流体中产生更高的温度和更高的传热速率。当颗粒呈叶片状时，努塞尔数增加比颗粒呈球形时高7.6%。这些启示对生物医学热控制装置、电子冷却系统和工业热交换器领域的热设计具有实际意义。

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引用次数: 0

Luminescent carbon quantum dots from multi-walled carbon nanotubes: A sustainable green synthesis approach 多壁碳纳米管发光碳量子点：一种可持续的绿色合成方法

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-09-01 Epub Date: 2025-06-07 DOI: 10.1016/j.nanoso.2025.101503

Jithin Varghese , K.C. Sanal , Oxana V. Kharissova , Alexander L. Nikolaev , Nayely Pineda Aguilar , David Avellaneda Avellaneda , Boris I. Kharisov

Luminescent carbon quantum dots (CQDs) were synthesized via a simple and eco-friendly approach using unfunctionalized multi-walled carbon nanotubes (MWCNTs) and hydroxyl-functionalized MWCNTs (MWCNT-COOH) as precursors. The synthesis involved a 1:1:1 mixture of MWCNTs, Theraphthal (TP), and ascorbic acid in water, followed by centrifugation and filtration. Transmission electron microscopy (TEM) confirmed the spherical morphology of the CQDs, with average sizes of 3.26 ± 0.57 nm for CQD-A and 3.46 ± 0.57 nm for CQD-B. Fourier-transform infrared (FTIR) spectroscopy and UV-Vis analysis revealed variations in surface functionalization and optical properties. The green fluorescence observed under UV irradiation highlights the potential of these CQDs for applications in bioimaging and optoelectronics.

以非功能化多壁碳纳米管（MWCNTs）和羟基功能化多壁碳纳米管（MWCNTs - cooh）为前驱体，采用简单环保的方法合成了发光碳量子点（CQDs）。该合成方法将MWCNTs、Theraphthal （TP）和抗坏血酸以1:1:1的比例混合在水中，然后进行离心和过滤。透射电镜（TEM）证实了cqd的球形形貌，CQD-A的平均尺寸为3.26 ± 0.57 nm， CQD-B的平均尺寸为3.46 ± 0.57 nm。傅里叶变换红外光谱（FTIR）和UV-Vis分析揭示了表面功能化和光学性质的变化。在紫外照射下观察到的绿色荧光突出了这些CQDs在生物成像和光电子学方面的应用潜力。

引用次数: 0