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

Impact of synthesis temperature on the physicochemical and optoelectronic properties of titania and oxidized carbon nanotube nanocomposites for the degradation of Remazol brilliant blue R 合成温度对氧化碳纳米管/二氧化钛纳米复合材料降解雷马唑亮蓝R的理化及光电性能的影响

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-07-29 DOI: 10.1016/j.nanoso.2025.101519

Standford M. Pedzisai , Sithembela A. Zikalala , Lerato L. Mokoloko , Nozipho N. Gumbi , Machawe M. Motsa , Edward N. Nxumalo

A facile microwave irradiation-assisted hydrothermal method was employed in the synthesis of nanocomposites of titanium dioxide (TiO₂) and oxidized carbon nanotubes (OCNTs) to investigate the effect of synthesis temperature on their properties and photocatalytic performance. The synthesis temperatures used were 90, 120, 150, and 180 °C to produce nanocomposites T90, T120, T150, and T180, respectively. Attachment of TiO₂ to the surface of the OCNTs and presence of the OCNTs thereof was confirmed by transmission electron microscopy (TEM) as well as Raman spectroscopy. Powder X-ray diffraction (p-XRD) confirmed that the syntheses yielded the anatase titania crystalline polymorph. Ultraviolet (UV) spectroscopy results showed that the indirect energy bandgaps of the nanocomposites were all within the visible light range and increased with synthesis temperature in the order 2.34 eV, 2.75 eV, 2.87 eV, and 3.08 eV. Charge carrier recombination inhibition also increased with the synthesis temperature of the nanocomposites as revealed by the photoluminescence (PL) studies, at an excitation wavelength of 410 nm. The photocatalytic activities of the nanocomposites were tested in the photodegradation of Remazol brilliant blue R (RBBR) dye under sunlight for up to 180 min and the degradation followed the pseudo first order kinetics. Interestingly, the T180 nanocomposite demonstrated favorable comparability with other photocatalysts that have previously been applied for the degradation of RBBR dye in that, using sunlight , 99.1 % of the dye was degraded in a saline environment within 240 min, at a high pollutant to photocatalyst loading ratio. T180 further demonstrated high reusability without washing between the cycles by retaining in its 5th cycle 69.6 % and 89.5 % of its photocatalytic activity after 180 and 240 min, respectively. Based on this work, T180 is a potential catalyst for application in the remediation of industrial textile wastewater, especially laden with reactive dyes.

采用微波辅助水热法制备了二氧化钛（TiO2）与氧化碳纳米管（OCNTs）纳米复合材料，考察了合成温度对其性能和光催化性能的影响。合成温度分别为90、120、150和180℃，制备了T90、T120、T150和T180纳米复合材料。通过透射电子显微镜（TEM）和拉曼光谱（Raman spectroscopy）证实了二氧化钛附着在碳纳米管表面以及碳纳米管的存在。粉末x射线衍射（p-XRD）证实该合成产物为锐钛矿型钛晶多晶。紫外光谱结果表明，纳米复合材料的间接能隙均在可见光范围内，并随合成温度的升高依次增大，分别为2.34 eV、2.75 eV、2.87 eV和3.08 eV。光致发光（PL）研究表明，在激发波长为410 nm时，随着纳米复合材料合成温度的升高，载流子复合的抑制作用也有所增强。在180 min的光照下，测试了纳米复合材料对雷马唑亮蓝R （RBBR）染料的光催化活性，降解符合准一级动力学。有趣的是，T180纳米复合材料与之前用于降解RBBR染料的其他光催化剂表现出良好的可比性，在240 min的盐水环境中，在高污染物和光催化剂负载比下，99.1 %的染料在阳光下被降解。T180在180和240 min后，在第5个循环中分别保持了69.6 %和89.5 %的光催化活性，进一步证明了高的可重复使用性。研究结果表明，T180是一种很有潜力的催化剂，可用于工业纺织废水，特别是含活性染料废水的修复。

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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 : 2025-07-25 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

Solvothermal synthesis of CZTS nano-structure based-electrospun PAN nanofibers impact on characterizations and antibacterial activity 溶剂热合成CZTS纳米结构静电纺PAN纳米纤维对其性能和抗菌活性的影响

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-07-18 DOI: 10.1016/j.nanoso.2025.101517

Ahmed I. Abdelamir, Fouad Sh. Hashim

The study focused on the solvothermal approach to synthesize Cu₂ZnSnS₄ (CZTS) nanoparticles (NPs) with an average particle size of 50 nm. At the same time, the composite nanofibers were fabricated from PAN-CZTS using the electrospinning method. XRD analysis confirmed the formation of the kesterite CZTS phase, while the functional groups revealed the chemical properties of the as-prepared samples via FTIR analysis. The FESEM images of CZTS indicated the appearance of quasi-spherical and nanoworm shapes, also a uniform nanofiber from PAN and PAN-CZTS with average diameters, descending order from 145 to 127 nm. The EDXs showed the compositional elements for as prepared samples. The TEM image proved the inclusion of CZTS NPs within polymer matrix. The significant highest absorption of CZTS is exhibited in the Vis region at about 400 nm, while at 260 nm in the UV region for nanocomposites, which makes it suitable applications in optoelectronic. Additionally, the values of the indirect optical band gap (

E_{g indir .}^{opt})

decreased from 3.6 to 2.6 eV using the Tauc model and confirmed by the imaginary dielectric constant

{(E}_{g}^{ε i})

. The high real dielectric constant and low imaginary dielectric constant values displayed that the prepared films can be used in the manufacture of optical energy storage devices. Furthermore, the CZTS-encapsulated PAN nanofiber demonstrated notable antibacterial activity against four bacterial strains, with maximum inhibition zones (23 ± 1.25 mm) for Staphylococcus aureus. This makes it useful in the medical field.

采用溶剂热法制备了平均粒径为50 nm的Cu2ZnSnS4 （CZTS）纳米粒子。同时，采用静电纺丝法制备了PAN-CZTS复合纳米纤维。XRD分析证实了kesterite CZTS相的形成，FTIR分析表征了其官能团的化学性质。从FESEM图像可以看出，PAN和PAN-CZTS的纳米纤维呈准球形和纳米蠕虫状，其平均直径从145 ~ 127 nm依次递减。edx显示了制备样品的组成元素。TEM图像证实了CZTS NPs存在于聚合物基体中。纳米复合材料在可见光区（400 nm）和紫外区（260 nm）的吸光度最高，这使其在光电领域具有良好的应用前景。此外，间接光学带隙（Eg indirect .opt）的值从3.6 eV下降到2.6 eV，并由虚介电常数（Egεi）证实。高的实介电常数和低的虚介电常数表明所制备的薄膜可用于制造光储能器件。此外，经czts包封的PAN纳米纤维对4种细菌均有明显的抑菌活性，对金黄色葡萄球菌的最大抑菌带为23±1.25 mm。这使得它在医学领域很有用。

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引用次数: 0

Polyphosphazene frameworks for sustainable applications in adsorption, flame retardancy and electrochemistry 聚磷腈框架在吸附、阻燃和电化学方面的可持续应用

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-07-18 DOI: 10.1016/j.nanoso.2025.101518

Zahid Ali , Abdul Majid Khan , Muhammad Asim Mushtaq , Liu Wei , William W. Yu , Zhanpeng Wu

Polyphosphazenes (PPZ) and their derivatives have grasped the immense desirability of scientists predominantly due to their exceptional physico-chemical properties, such as chain flexibility, increased thermal stability, and high flame resistance. Substantial developments have been achieved with the exploration of new functionalities, including surface-responsive groups, topological, and morphological features. In this review, we present historical developments and the role of PPZ derivatives in achieving the Sustainable Development Goals (SDGs) for viable developments. We provide a basic classification of PPZ-based materials, focusing on their morphologies and the tunability of these morphologies to targeted dimensions. Additionally, the progress in the structural development of PPZ and their derivatives with covalent organic frameworks (COFs), metal-organic frameworks (MOFs), and covalent organic-inorganic frameworks (COIFs) has been discussed. Furthermore, we discussed the role of surface morphologies and surface area of PPZ-based materials for the adsorptive removal of toxic dye and heavy metals. Additionally, we summarize the applications of PPZ-based materials, including adsorption, heat shielding, and electrochemical applications (such as energy production and energy storage).

聚磷腈（PPZ）及其衍生物由于其特殊的物理化学性质，如链的柔韧性，增加的热稳定性和高阻燃性，已经抓住了科学家的巨大愿望。随着新功能的探索，包括表面响应基团、拓扑和形态特征，已经取得了实质性的进展。在这篇综述中，我们介绍了PPZ衍生物的历史发展和在实现可持续发展目标（SDGs）中的作用。我们提供了基于ppz的材料的基本分类，重点关注它们的形态和这些形态对目标尺寸的可调性。此外，还讨论了PPZ及其衍生物的共价有机骨架（COFs）、金属-有机骨架（mfs）和共价有机-无机骨架（COFs）的结构发展进展。此外，我们还讨论了ppz基材料的表面形貌和表面积在吸附去除有毒染料和重金属中的作用。此外，我们总结了ppz基材料的应用，包括吸附、热屏蔽和电化学应用（如能源生产和储能）。

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引用次数: 0

Advanced miRNA-nanoparticle strategies for brain cancer treatment: Bypass the blood-brain barrier for efficient treatment 先进的mirna -纳米颗粒脑癌治疗策略：绕过血脑屏障进行有效治疗

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-07-17 DOI: 10.1016/j.nanoso.2025.101516

Shivam Rajput , Rishabha Malviya , Sathvik Belagodu Sridhar , Tarun Wadhwa , Javedh Shareef , Anjali Rana

The most aggressive form of brain cancer, glioblastoma, continues to pose a substantial therapeutic challenge as a result of its invasive character and poor prognosis. The median survival rate rarely exceeds 16 months. Treatment is made more difficult by the blood-brain barrier (BBB), which prevents drugs from reaching the brain. Despite improvements in medical and surgical techniques, there are still no reliable biomarkers for early diagnosis and prognosis, and new treatment alternatives such as immune checkpoint inhibitors have not yet received approval. MicroRNAs (miRNAs) have emerged as attractive candidates for glioblastoma detection and therapy, considering their crucial role in cancer progression and their ability to cross the cerebrospinal fluid and blood. Recent developments in miRNA-based therapeutics, including miRNA mimics and inhibitors, have demonstrated potential in clinical studies. However, difficulties like as degradation, transient expression, and poor targeting restrict their clinical applicability. Nanoparticles (NPs) offer a potential technique to increase miRNA stability and targeted delivery, effectively overcoming BBB restrictions. The article addresses the specific features of NPs based miRNA delivery that promote BBB penetration, the mechanisms of NP transport, and the development of theranostic nanoplatforms for precision glioblastoma diagnosis and therapy. Furthermore, the newest breakthroughs in miRNA nanoformulations are highlighted, showing their potential to change glioblastoma treatment.

胶质母细胞瘤是脑癌中最具侵袭性的一种，由于其侵袭性和预后差，一直是治疗上的一大挑战。中位生存率很少超过16个月。由于血脑屏障（BBB）阻止药物进入大脑，治疗变得更加困难。尽管医学和外科技术有所进步，但仍然没有可靠的早期诊断和预后生物标志物，新的治疗方案如免疫检查点抑制剂尚未获得批准。考虑到MicroRNAs在癌症进展中的关键作用以及它们穿过脑脊液和血液的能力，MicroRNAs （miRNAs）已成为胶质母细胞瘤检测和治疗的有吸引力的候选者。最近基于miRNA的治疗方法的发展，包括miRNA模拟物和抑制剂，已经在临床研究中显示出潜力。但其降解难、表达短暂性、靶向性差等问题限制了其临床应用。纳米颗粒（NPs）提供了一种潜在的技术来提高miRNA的稳定性和靶向递送，有效地克服血脑屏障的限制。本文阐述了基于NP的miRNA传递促进血脑屏障渗透的具体特征，NP转运的机制，以及用于胶质母细胞瘤精确诊断和治疗的治疗纳米平台的发展。此外，还强调了miRNA纳米制剂的最新突破，显示了它们改变胶质母细胞瘤治疗的潜力。

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引用次数: 0

Thermal-flow characteristics of an Ellis hybrid nanofluid containing polytetrafluoroethylene-SWCNTs over a stretching/shrinking cylinder with slip effect 含有聚四氟乙烯- swcnts的Ellis混合纳米流体在具有滑移效应的拉伸/收缩圆柱体上的热流特性

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-07-14 DOI: 10.1016/j.nanoso.2025.101515

Ashish Mishra , Gunjan Pathak

Hybrid nanofluids containing polytetrafluoroethylene (PTFE) nanoparticles and single-walled carbon nanotubes (SWCNTs) in a H₂O–carboxymethyl cellulose (CMC) medium, using Ellis fluid model, exhibit excellent thermal conductivity and enhanced viscosity. These enhanced properties make them ideal for applications in thermal management systems, medical technologies, tribology, and sustainable energy solutions, highlighting their potential for improved performance and efficiency. This study focuses on analyzing the characteristics of Ellis hybrid nanofluid flow along a stretching or shrinking cylinder, considering the combined impacts of thermal radiation, slip, magnetic field, and suction/blowing. A mathematical model is developed using partial differential equations, which are converted into dimensionless ODEs via similarity transformations. These expressions are then solved numerically with the aid of the bvp4c solver. Graphical representations are utilized to examine the effects of key factors on the velocity and temperature profiles, as well as on the skin friction coefficient and the local Nusselt number. The results show that the curvature parameter, Ellis fluid parameter, and stretching/shrinking parameter enhance flow, while Forchheimer number, porosity, slip, and suction/blowing parameters reduce it. Also, an upsurge in Eckert number, magnetic and radiation parameters enhance temperature, while higher porosity and velocity slip reduce it. Moreover, an increase in curvature parameter reduces the absolute value of the skin friction coefficient, along with rises in velocity slip and shrinking parameters.

采用Ellis流体模型，在h2o -羧甲基纤维素（CMC）介质中制备含有聚四氟乙烯（PTFE）纳米颗粒和单壁碳纳米管（SWCNTs）的混合纳米流体，表现出优异的导热性和增强的粘度。这些增强的性能使其成为热管理系统、医疗技术、摩擦学和可持续能源解决方案应用的理想选择，突出了其提高性能和效率的潜力。考虑热辐射、滑移、磁场和吸力/吹气的综合影响，重点分析了Ellis混合纳米流体沿拉伸或收缩圆柱体的流动特性。利用偏微分方程建立数学模型，通过相似变换将偏微分方程转化为无量纲偏微分方程。然后借助bvp4c求解器对这些表达式进行数值求解。使用图形表示来检查关键因素对速度和温度分布的影响，以及对表面摩擦系数和局部努塞尔数的影响。结果表明，曲率参数、Ellis流体参数和拉伸/收缩参数对流动有促进作用，而Forchheimer数、孔隙度、滑移和吸吹参数对流动有抑制作用。此外，埃克特数、磁性和辐射参数的增加会提高温度，而孔隙度和速度滑移的增加会降低温度。曲率参数的增大减小了表面摩擦系数的绝对值，同时速度滑移和收缩参数增大。

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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 : 2025-07-10 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

Biogenic silver nanoparticles synthesized from Smilax glabra root extract: A green approach with antimicrobial properties 从菝葜根提取物中合成的生物纳米银：一种具有抗菌特性的绿色方法

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-07-03 DOI: 10.1016/j.nanoso.2025.101513

Mai Phuong Nguyen Thi , Thuy Duong Le Thi , Tri Thien Vu , Bich Thuy Ly Thi , Hoai Bac Vo , Van Quyen Dong , Duong Duc La

Silver nanoparticles (AgNPs) have garnered significant research interest and practical applications due to their unique physicochemical properties such as high electrical and thermal conductivity, enhanced surface Raman scattering, chemical stability, catalytic activity and, most notably, strong antibacterial, antifungal, and antiviral effects. Among the methods for AgNP synthesis, green synthesis using plant extracts is of particular interest because of its stability, sustainability, strongbiological activity, safety and environmental friendliness. This work presented the novel data on synthesis of the AgNPs using the Smilax glabra Roxb root extract. The fabricated AgNPs were characterized using scanning electron microscopy, X-ray diffraction, energy diffractive spectroscopy, and fourier-transform infrared spectroscopy. The anti-bacterial activity against bacterial pathogens, including antibiotic susceptible and resistant Staphylococcus aureus, Escherichia coli and Streptococcus mutans, was examined using agar diffusion and spectrophotometric methods at A₇₀₀. The local toxicity of AgNPs was evaluatedin rabbits. The results showed that AgNPs had uniform distribution and spherical shape with the particle size in ranging from 20 to 50 nm. The nanoparticles exhibited antibacterialactivity against all tested microorganisms, including S. aureus ATCC 25923 (antibiotic- susceptible strain), antibiotic-resistant S. aureus strains ATCC 29213, ATCC 12493, 252, E. coli 25922 and dental caries bacterium S. mutans GS-5. Remarkably, no local toxicity of AgNPs was detected in the tested rabbits. Thus, the obtained data support the applications of these AgNPs in practice, such as in oral health care or dermal products.

银纳米粒子（AgNPs）由于其独特的物理化学性质，如高导电性和导热性、增强的表面拉曼散射、化学稳定性、催化活性，以及最显著的强抗菌、抗真菌和抗病毒作用，已经获得了重要的研究兴趣和实际应用。在AgNP的合成方法中，植物提取物的绿色合成因其稳定性、可持续性、强生物活性、安全性和环境友好性而备受关注。本文报道了利用菝葜根提取物合成AgNPs的新数据。利用扫描电子显微镜、x射线衍射、能量衍射光谱和红外光谱对制备的AgNPs进行了表征。采用琼脂扩散法和分光光度法对A700细菌病原菌（包括敏感和耐药金黄色葡萄球菌、大肠杆菌和变形链球菌）的抑菌活性进行了检测。用家兔评价AgNPs的局部毒性。结果表明，AgNPs分布均匀，呈球形，粒径在20 ~ 50 nm之间。该纳米颗粒对所有被测微生物均具有抗菌活性，包括金黄色葡萄球菌ATCC 25923（抗生素敏感菌株）、耐药金黄色葡萄球菌ATCC 29213、ATCC 12493、252、大肠杆菌25922和龋齿变形链球菌GS-5。值得注意的是，AgNPs在试验家兔中未检测到局部毒性。因此，获得的数据支持这些AgNPs在实践中的应用，例如在口腔保健或皮肤产品中。

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引用次数: 0

Synergistic ultrasound and microwave synthesis of WO3 nanostructures for dielectric and supercapacitor performance 超声和微波协同合成WO3纳米结构对介电性能和超级电容器性能的影响

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-07-02 DOI: 10.1016/j.nanoso.2025.101512

P. Periasamy , Shalini Packiam Kamala , V.P. Devarajan , T. Krishnakumar , P. Sakthivel

Microwave and ultrasound irradiation are two non-conventional types of energy that have been used to advance the field of inorganic nanomaterial synthesis, as these sources enable the production of enhanced synthetic efficacies, as well as environmental friendliness. In this study, we describe how we created WO₃ nanostructures using a new method that combines ultrasound and microwave energy for use in supercapacitors and dielectric devices. X-ray diffraction also confirmed a highly crystalline orthorhombic WO₃ structure. In contrast, SEM and FESEM microscopy revealed nanorod and nanosheet morphologies that formed amalgamated structures with an average crystalline size of 19–24 nm. The purity and composition of the synthesised material were confirmed by EDAX. Electrochemical measurements showed that the sample prepared with 5 min of ultrasonic irradiation had the highest specific capacitance of 252 F/g, with exceptional capacitance maintenance of 100 % after 3000 charge-discharge cycles, much greater than values that were previously reported for WO₃ synthesised by conventional hydrothermal or microwave-only processes (generally 44–200 F/g and lower retention). Dielectric results provided a dielectric constant of 6.88–14.16 at 1 kHz (40–100 °C) and an increase in AC conductivity with increasing frequency and temperature. Synergistic combinations of ultrasound and microwave irradiation yielded better crystallinity, agglomeration synthesis methods. This paper shows that using ultrasound with microwave-assisted WO₃ nanostructures can lead to better uses in future energy storage and dielectric-related applications.

微波和超声波辐照是两种非传统的能量，已被用于推进无机纳米材料合成领域，因为这些来源能够提高合成效率，同时对环境友好。在这项研究中，我们描述了我们如何使用一种结合超声波和微波能量的新方法来制造WO₃纳米结构，用于超级电容器和介电器件。x射线衍射也证实了一种高结晶的正交型WO₃结构。相比之下，SEM和FESEM显微镜显示纳米棒和纳米片形态形成了平均晶粒尺寸为19-24 nm的合并结构。合成材料的纯度和组成经EDAX确证。电化学测量表明，用5 min的超声辐照制备的样品具有最高的252 F/g的比电容，在3000次充放电循环后，其电容维持率为100% %，远高于以前报道的用常规水热或微波合成的WO₃的值（通常为44-200 F/g，保留率较低）。介电结果表明，在1 kHz（40-100°C）时介电常数为6.88-14.16，交流电导率随频率和温度的增加而增加。超声与微波协同作用，获得了结晶度、团聚性较好的合成方法。这篇论文表明，将超声波与微波辅助的WO₃纳米结构结合起来，可以在未来的能量存储和电介质相关应用中得到更好的应用。

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引用次数: 0

Radiation effect on gravity-driven nanofluid flow over a convective heated wall: RSM and ANN prediction analysis 辐射对重力驱动纳米流体在对流加热壁上流动的影响：RSM和ANN预测分析

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-06-29 DOI: 10.1016/j.nanoso.2025.101506

Mojeed T. Akolade , Amos S. Idowu

Gravity-driven flows occur in both reservoir engineering and biological systems such as nutrient transport in blood and macromolecular migration in plants. In each case, the incorporation of engineered nanoparticles systematically enhances heat and mass transfer, overcoming the limitations of conventional refrigerants. In light of these applications, present investigation contribute to the existing body of knowledge through the development of a computational tool and predictive paradigms to help optimize and predict the desire output of heat and mass transfer flow of Casson nanofluid over a heated plate. To analyze these complex, nanoparticle influenced phenomena, a mathematical model is presented under the Bernoulli principle with conservation equations. Similarity transformation is employed to reduce the governing partial differential equations into a systems of ordinary differential equations, which are then solved using the spectral local linearization method for rapid convergence and high accuracy. The obtained responses from the numerical computations are used as prediction data for both the Artificial Neural Network (ANN) and Response Surface Methodology (RSM) under the randomized Box-Behnken (BB) design. The ANN adopt the MATLAB inbuilt Bayesian regularization algorithm. Our findings highlight that, co-contribution of buoyancy induced number

G r

and soret phenomenon

S r

diminished the heat transfer rate. For both assisting and opposing flow, an enhance phenomenon of energy and momentum field is experienced. The interplay of opposing flow with higher thermal radiation experienced an enhanced heat transfer rate while significant involvement of the internally generated heat (

E c

) optimizes the heat transfer mechanism identify as effective heat transfer management. Moreover, through the prediction algorithm by RSM/ANN, we acquired a useful knowledge on effective energy optimization and cooling techniques for numerous biomedical and industrial applications.

重力驱动的流动既存在于水库工程中，也存在于生物系统中，如血液中的营养物质运输和植物中的大分子迁移。在每种情况下，工程纳米颗粒的结合系统地增强了传热和传质，克服了传统制冷剂的局限性。鉴于这些应用，本研究通过开发计算工具和预测范式来帮助优化和预测卡森纳米流体在加热板上的传热和传质流的期望输出，从而为现有的知识体系做出贡献。为了分析这些复杂的纳米粒子影响现象，在伯努利原理下建立了守恒方程的数学模型。采用相似变换将控制偏微分方程简化为常微分方程组，然后采用谱局部线性化方法求解，收敛速度快，精度高。在随机Box-Behnken （BB）设计下，将数值计算得到的响应作为人工神经网络（ANN）和响应面法（RSM）的预测数据。该人工神经网络采用MATLAB内置的贝叶斯正则化算法。我们的研究结果表明，浮力诱导数Gr和温度现象Sr的共同作用降低了换热速率。在助流和逆流中，能量场和动量场都有增强的现象。相反的流动与较高的热辐射的相互作用经历了增强的传热速率，而内部产生的热量（Ec）的显著参与优化了传热机制，被认为是有效的传热管理。此外，通过RSM/ANN的预测算法，我们获得了许多生物医学和工业应用的有效能量优化和冷却技术的有用知识。

{"title":"Radiation effect on gravity-driven nanofluid flow over a convective heated wall: RSM and ANN prediction analysis","authors":"Mojeed T. Akolade , Amos S. Idowu","doi":"10.1016/j.nanoso.2025.101506","DOIUrl":"10.1016/j.nanoso.2025.101506","url":null,"abstract":"<div><div>Gravity-driven flows occur in both reservoir engineering and biological systems such as nutrient transport in blood and macromolecular migration in plants. In each case, the incorporation of engineered nanoparticles systematically enhances heat and mass transfer, overcoming the limitations of conventional refrigerants. In light of these applications, present investigation contribute to the existing body of knowledge through the development of a computational tool and predictive paradigms to help optimize and predict the desire output of heat and mass transfer flow of Casson nanofluid over a heated plate. To analyze these complex, nanoparticle influenced phenomena, a mathematical model is presented under the Bernoulli principle with conservation equations. Similarity transformation is employed to reduce the governing partial differential equations into a systems of ordinary differential equations, which are then solved using the spectral local linearization method for rapid convergence and high accuracy. The obtained responses from the numerical computations are used as prediction data for both the Artificial Neural Network (ANN) and Response Surface Methodology (RSM) under the randomized Box-Behnken (BB) design. The ANN adopt the MATLAB inbuilt Bayesian regularization algorithm. Our findings highlight that, co-contribution of buoyancy induced number <span><math><mrow><mi>G</mi><mi>r</mi></mrow></math></span> and soret phenomenon <span><math><mrow><mi>S</mi><mi>r</mi></mrow></math></span> diminished the heat transfer rate. For both assisting and opposing flow, an enhance phenomenon of energy and momentum field is experienced. The interplay of opposing flow with higher thermal radiation experienced an enhanced heat transfer rate while significant involvement of the internally generated heat (<span><math><mrow><mi>E</mi><mi>c</mi></mrow></math></span>) optimizes the heat transfer mechanism identify as effective heat transfer management. Moreover, through the prediction algorithm by RSM/ANN, we acquired a useful knowledge on effective energy optimization and cooling techniques for numerous biomedical and industrial applications.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"43 ","pages":"Article 101506"},"PeriodicalIF":5.45,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144514212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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