Nano-Structures & Nano-Objects最新文献_第3页

Modifying the structural and magnetic behavior of Mg-Ni doped cobalt nanoferrites 改性Mg-Ni掺杂钴纳米铁素体的结构和磁性行为

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-11 DOI: 10.1016/j.nanoso.2025.101600

Y.S. Bopche , D.S. Choudhary , M.S. Bisen , P.B. Wasnik , A.V. Bagde , A.M. Shahare , R.M. Meshram , U.B. Hatwar

The concurrent doping of Mg²⁺ and Ni²⁺ into cobalt ferrite (CF) with the stoichiometric formula Co_1-xNi_0.5xMg_0.5xFe₂O₄ (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) was accomplished utilizing the spontaneous sol-gel method. Synthesized CF black powder was sintered at 700°C, and samples were examined for structural and magnetic properties using various techniques. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), and vibration sample magnetometry (VSM) were used to analyze samples at room temperature. XRD analysis showed clearly defined indexed peaks, indicating enhanced crystallinity and a polycrystalline nature of synthesized materials. Lattice constant and hopping lengths for all samples declined with Mg-Ni substitution, while the crystalline size increased from 21.41 nm to 41.74 nm. Dislocation density diminished as Mg-Ni content increased, resulting in enhanced crystallinity. FESEM micrographs revealed larger particle sizes and different agglomeration behavior, revealing a quasi-spherical morphology characteristic of ferrites produced by the sol-gel process. EDX confirmed the existence of diverse compositional ratios of doped (Ni, Mg) and Co, Fe, and O ions, validating the intended stoichiometric composition. The magnetic properties are significantly affected by the distribution of cations in their preferred locations and the magnetic and non-magnetic characteristics of doping elements. Improved magnetic features of sample x = 0.3 (Co_0.7Ni_0.15Mg_0.15Fe₂O₄) with small particle size have significant applications in various fields.

采用自发溶胶-凝胶法将Mg 2 +和Ni 2 +同时掺杂到钴铁氧体（CF）中，化学计量公式为Co1-xNi0.5xMg0.5xFe2O4 （x = 0,0.1,0.2,0.3,0.4,0.5）。合成的CF黑粉在700℃下烧结，并采用各种技术对样品进行了结构和磁性能测试。采用x射线衍射（XRD）、场发射扫描电镜（FESEM）、高分辨率透射电镜（HRTEM）和振动样品磁强计（VSM）对室温下样品进行分析。XRD分析显示了清晰的指向性峰，表明合成材料的结晶度和多晶性增强。所有样品的晶格常数和跳变长度随着Mg-Ni的取代而下降，而晶体尺寸从21.41 nm增加到41.74 nm。随着Mg-Ni含量的增加，位错密度降低，结晶度增强。FESEM显微形貌显示了较大的颗粒尺寸和不同的团聚行为，揭示了溶胶-凝胶法制备铁氧体的准球形形貌特征。EDX证实了掺杂（Ni, Mg）和Co， Fe和O离子的不同组成比例的存在，验证了预期的化学计量组成。阳离子在其首选位置的分布以及掺杂元素的磁性和非磁性对磁性能有显著影响。小粒径样品x = 0.3 （Co0.7Ni0.15Mg0.15Fe2O4）的磁性能得到改善，在各个领域都有重要的应用。

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引用次数: 0

SERS sensing of the biomolecule of Palbociclib (PCB) adsorbed on Au3 cluster: DFT, reactivity, docking and MD simulations 帕博西尼生物分子吸附在Au3簇上的SERS传感：DFT、反应性、对接和MD模拟

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-10 DOI: 10.1016/j.nanoso.2025.101597

Jamelah S. Al-Otaibi , Y. Sheena Mary , A. Saral , M. Cristina Gamberini

Understanding how anticancer drugs interact with metallic nanoclusters is essential for developing next-generation sensing and delivery platforms. In this study, we investigate the adsorption behavior, spectroscopic response, reactivity, and biological binding characteristics of Palbociclib (PCB) on a gold triatomic cluster (Au₃) using an integrated computational framework. Density functional theory (DFT) calculations reveal strong and site-selective adsorption of PCB on Au₃ accompanied by pronounced charge transfer and significant modulation of the molecule’s electronic structure including reduced HOMO-LUMO gaps, enhanced polarizability, and improved nonlinear optical (NLO) characteristics. Vibrational and SERS analyses show characteristic red shifts and intensity enhancements, confirming stable coordination through key nitrogen and oxygen bearing functional groups. Solvent-phase calculations further demonstrate that PCB-Au₃ complexes gain substantial stabilization in aqueous media, reinforcing their potential in biological environments. Molecular docking and 100 ns molecular dynamics simulations with the 5GS4 protein indicate that both free PCB and PCB-Au₃ form thermodynamically favorable and dynamically stable complexes, with PCB-Au₃ exhibiting enhanced interaction diversity through hydrophobic, hydrogen-bonding, and Au-induced electronic effects. MM-GBSA analysis supports these findings, revealing competitive binding energies for both ligands. Collectively, these results highlight Au₃ nanoclusters as promising nanoscale scaffolds for SERS-based detection and controlled delivery of PCB, providing valuable insights for cancer diagnostic and theranostic applications.

了解抗癌药物如何与金属纳米团簇相互作用对于开发下一代传感和递送平台至关重要。在这项研究中，我们使用集成计算框架研究了帕博西尼（PCB）在金三原子簇（Au3）上的吸附行为、光谱响应、反应性和生物结合特性。密度泛函理论（DFT）计算表明，PCB在Au3上的强选择性吸附伴随着明显的电荷转移和分子电子结构的显著调制，包括减少HOMO-LUMO间隙，增强极化率和改善非线性光学（NLO）特性。振动和SERS分析显示出特有的红移和强度增强，证实了关键的含氮和含氧官能团之间的稳定配位。溶剂相计算进一步表明，PCB-Au3配合物在水介质中获得了相当大的稳定性，增强了它们在生物环境中的潜力。与5GS4蛋白的分子对接和100 ns分子动力学模拟表明，游离PCB和PCB- au3形成了热力学有利和动态稳定的配合物，PCB- au3通过疏水、氢键和au诱导的电子效应表现出更强的相互作用多样性。MM-GBSA分析支持这些发现，揭示了两种配体的竞争结合能。总之，这些结果突出了Au3纳米团簇作为基于sers检测和PCB控制递送的有前途的纳米级支架，为癌症诊断和治疗应用提供了有价值的见解。

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引用次数: 0

Green synthesized ZnO-Ag functionalized electrospun PAN nanofibers for efficient crystal violet dye removal: A combined experimental and computational approach 绿色合成ZnO-Ag功能化电纺丝PAN纳米纤维高效去除结晶紫染料：实验与计算相结合的方法

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-09 DOI: 10.1016/j.nanoso.2025.101598

Sradhanjali Raut , Arpita Patro , Satyanarayan Dhal , Shraban Kumar Sahoo

In this work, the ZnO-Ag composite nanopowder was first synthesized greenly using plant leaf extract. Then PAN@ZnO-Ag nanofiber sheets were prepared using greenly synthesized nanopowder by the electrospinning method. The synthesized nanofiber sheets were used to remove Crystal Violet (CV) dye from aqueous solution. Computational molecular simulation was used to theoretically study the mechanical properties and the feasibility of the adsorption process. The formation of the hexagonal ZnO and cubic Ag on electrospun PAN nanofiber was confirmed via XRD peaks. The formation of ZnO-Ag nanoparticles with a size of 15–25 nm on the 1D PAN fibers surface, having a diameter of 210–270 nm was observed. A batch experiment was conducted to evaluate adsorption efficiency by adjusting the adsorbent dose, pH, contact time, and the initial CV dye concentration. The adsorption rate and equilibration were evaluated by kinetic and isotherm studies. The adsorption mechanism followed the Langmuir adsorption isotherm model due to a high R² value with a maximum adsorption capacity of 128.91 mg/g at pH= 9. Kinetic evaluation indicated that the pseudo-first-order model gave the best fit to the experimental data. The bonding of CV dyes on adsorbent involves H-bonding, electrostatic interaction as well as π-π interaction. A higher negative adsorption energy indicates a more stable adsorption process.

本文首次以植物叶片提取物为原料，绿色合成了ZnO-Ag复合纳米粉体。然后采用静电纺丝法制备绿色合成纳米粉体PAN@ZnO-Ag纳米纤维片。将合成的纳米纤维片用于去除水溶液中的结晶紫（CV）染料。采用计算分子模拟的方法对吸附过程的力学性能和可行性进行了理论研究。通过XRD峰分析，证实了静电纺PAN纳米纤维上形成了六方ZnO和立方Ag。在一维PAN纤维表面形成了粒径为210 ~ 270 nm、粒径为15 ~ 25 nm的ZnO-Ag纳米颗粒。通过调整吸附剂剂量、pH、接触时间和初始CV染料浓度，进行了批量吸附实验。通过动力学和等温线研究评价了吸附速率和平衡。吸附机理符合Langmuir吸附等温线模型，在pH= 9时，R2值较高，最大吸附量为128.91 mg/g。动力学评价表明，拟一阶模型与实验数据拟合最好。CV染料在吸附剂上的成键包括h键、静电相互作用和π-π相互作用。负吸附能越高，吸附过程越稳定。

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引用次数: 0

Contrasting effects of ultrasonic modification on the structure, luminescence, and biocompatibility of isostructural Terbium- and Erbium-based MOFs 超声修饰对等结构铽基和铒基mof的结构、发光和生物相容性的对比影响

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-05 DOI: 10.1016/j.nanoso.2025.101589

Sandra Loera-Serna , Diana L. Sanchéz-Moreno , Rubén Ruiz-Ramos , Efrain Garrido , G. Alarcón-Flores , Ismael Garduño-Wilches

This research details the synthesis and comprehensive characterization of two isostructural lanthanide metal-organic frameworks (Ln-MOFs), Tb₂BDC₃ and Er₂BDC₃, prepared using a cost-effective room-temperature stirring method. Post-synthetic ultrasonic treatment (for 5, 10, and 15 min) was applied to modulate their physicochemical and functional properties. For the Tb₂BDC₃ MOF, PXRD confirmed structural integrity while crystal size was successfully reduced from 66.42 nm to as low as 37.96 nm. SEM confirmed the preserved needle-like morphology, and EDX verified stable elemental composition. This size reduction significantly enhanced its luminescent properties, more than doubling the quantum yield from 27.59 % to over 57 % (reaching 58.73 % with 5 min of sonication) alongside a significant increase in emission intensity and lifetime. In contrast, the initial Er₂BDC₃ material was synthesized as a metastable two-phase mixture. While sonication promoted a shift toward the stable QACTUJ phase, stability studies revealed that exposure to biological media included a complete structural transformation into a single, stable crystalline phase (PXRD). This reorganization was supported by FTIR evidence of phosphate incorporation and corresponding changes in the UV-Vis-NIR absorption profile. Biological compatibility assessments (Alamar Blue) demonstrated that neither MOF induced cytotoxicity or inhibited HaCaT cells proliferation at concentrations up to 100 µg/mL. These multi-technique findings highlight the effectiveness of ultrasonic modification for tuning the optical properties of Ln-MOFs and underscore their robust stability and excellent biocompatibility, positioning them as promising candidates for a safe and effective platform in bio-imaging and sensing applications.

本研究详细介绍了采用经济高效的室温搅拌法制备的Tb₂BDC₃和Er₂BDC₃两种镧系金属有机骨架（Ln-MOFs）的合成和综合表征。合成后的超声波处理（5、10和15 min）用于调节其物理化学和功能性质。对于Tb₂BDC₃MOF， PXRD证实其结构完整，晶体尺寸从66.42 nm降至37.96 nm。SEM和EDX证实其元素组成稳定。这种尺寸的减小显著增强了它的发光性能，量子产率从27.59 %增加到57 %以上（在5 min的超声下达到58.73 %），同时显著增加了发射强度和寿命。相比之下，最初的Er₂BDC₃材料被合成为亚稳的两相混合物。虽然超声波促进了QACTUJ向稳定相的转变，但稳定性研究表明，暴露于生物介质中包括完整的结构转变为单一、稳定的结晶相（PXRD）。FTIR中磷酸盐掺入的证据和相应的紫外-可见-近红外吸收谱的变化支持了这种重组。生物相容性评估（Alamar Blue）表明，MOF在浓度高达100 µg/mL时既不会诱导细胞毒性，也不会抑制HaCaT细胞的增殖。这些多技术的发现突出了超声波修饰对调整ln - mof光学特性的有效性，强调了它们强大的稳定性和出色的生物相容性，使它们成为生物成像和传感应用中安全有效的平台的有希望的候选者。

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引用次数: 0

Biogenic synthesis of silver nanoparticles using Azadirachta indica and Thevetia peruviana leaf extracts: Characterization, antibacterial analysis, machine learning-based toxicity, and In-Silico molecular docking studies for potential biomedical applications 利用印楝和荆芥叶提取物生物合成纳米银：表征、抗菌分析、基于机器学习的毒性和潜在生物医学应用的硅分子对接研究

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-05 DOI: 10.1016/j.nanoso.2025.101592

Shagun Varshney , Ram Pravesh Pandey , Shivam Mishra , Akhilesh Kumar Maurya , Nidhi Mishra

This study reports the eco-friendly synthesis of silver nanoparticles (Ag NPs) using leaf extracts of Azadirachta indica (Neem) and Thevetia peruviana (Kaner). Kaner-derived NPs exhibited superior properties with 24 nm crystallite size and 98.63 % purity, while Neem NPs showed irregular morphology (93.67 % Ag). The combined extract produced uniform, quasi-spherical particles (97.56 % Ag, 25–35 nm diameter), demonstrating synergistic stabilization. XRD analysis confirmed the presence of cubic/tetragonal crystal structures, and FTIR identified hydroxyl, carbonyl, and carboxyl groups as reducing/stabilizing agents. DLS measurements revealed hydrodynamic sizes of 80–180 nm with excellent colloidal stability for Kaner NPs (ζ-potential: −19.5 mV). Antibacterial assays showed concentration-dependent activity, with Kaner NPs demonstrating 12 mm inhibition zones against E. coli at 100 μg/mL and effectiveness against Bacillus subtilis. Molecular docking revealed interactions between the Ag atom and β-lactamase and MurA bacterial enzymes (binding energies: −0.74 to −0.93 kcal/mol), elucidating the antibacterial mechanism. Machine learning analysis (LightGBM) predicted dose-dependent behavior of 25–30 nm Ag-NPs across human cell lines, showing high LC50 values (375–850 µg/mL), ∼100 % viability, and negligible toxicity, confirming biocompatibility. These findings establish plant extract combinations as viable routes for the controlled synthesis of NPs with enhanced biomedical potential.

本研究报道了利用印楝树（印度楝）和秘鲁树（Kaner）的叶提取物环保合成纳米银粒子（Ag NPs）。kaner衍生的NPs具有优异的性能，晶粒尺寸为24 nm，纯度为98.63 %，而Neem衍生的NPs形貌不规则（纯度为93.67 %）。联合提取物产生均匀的准球形颗粒（97.56 % Ag， 25-35 nm直径），具有协同稳定作用。XRD分析证实了立方/四方晶体结构的存在，FTIR鉴定出羟基、羰基和羧基是还原/稳定剂。DLS测量显示，Kaner NPs的水动力尺寸为80-180 nm，具有优异的胶体稳定性（ζ-电位：−19.5 mV）。抗菌实验显示出浓度依赖性，Kaner NPs在100 μg/mL时对大肠杆菌有12 mm的抑制区，对枯草芽孢杆菌有效。分子对接揭示了Ag原子与β-内酰胺酶和MurA细菌酶之间的相互作用（结合能：−0.74 ~−0.93 kcal/mol），阐明了抗菌机制。机器学习分析（LightGBM）预测了25-30 nm Ag-NPs在人类细胞系中的剂量依赖性行为，显示出高LC50值（375-850 µg/mL），生存力~ 100 %，毒性可忽略不计，证实了生物相容性。这些发现确立了植物提取物组合作为控制合成具有增强生物医学潜力的NPs的可行途径。

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引用次数: 0

Enhancing tomato plant micropropagation using copper oxide nanoparticles synthesized from copper complexes of (Z)-N’-(3-ethoxy-2-hydroxybenzylidene)benzohydrazide 以(Z)- n ' -（3-乙氧基-2-羟基苄基）苯并肼铜配合物合成氧化铜纳米颗粒促进番茄植株微繁殖

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-04 DOI: 10.1016/j.nanoso.2025.101584

M.S. Meenukutty, Arsha P. Mohan, V.G. Vidya (Professor), V.G. Viju Kumar

Copper oxide nanoparticles (CuO NPs) are emerging as promising tools in plant biotechnology, particularly for improving tissue culture techniques. However, their application in tomato micropropagation is still not well understood. This study explores the impact of CuO NPs on the in vitro regeneration of Solanum lycopersicum L. cv. Sankranti, aiming to determine their effectiveness in promoting plant growth and development under controlled conditions.CuO NPs were synthesized by calcining copper(II) complexes of (Z)-N’-(3-ethoxy-2-hydroxybenzylidene)benzohydrazide, prepared from different copper salts: CuSO₄·5H₂O, CuCl₂·2H₂O, and Cu(NO₃)₂·3H₂O. These complexes were characterized using FT-IR, UV-Vis spectroscopy, mass spectrometry, thermogravimetric analysis (TGA), magnetic studies, and molar conductance. The nanoparticles were further analysed using FT-IR, UV-Vis, PXRD, SEM, and TEM to confirm their structure and morphology. To evaluate their biological effect, CuO NPs were added to Murashige and Skoog (MS) medium at varying concentrations (0.02, 0.2, and 2.0 mg/L) and tested on tomato nodal explants. Statistical analysis using one-way ANOVA confirmed that these enhancements were significant (p < 0.05) when compared to the control group. Overall, this study highlights the potential of CuO NPs, particularly at optimized concentrations, to serve as beneficial micronutrient additives in plant tissue culture. These results support their future application in improving micropropagation efficiency for tomato and possibly other high-value crops.

氧化铜纳米颗粒（CuO NPs）正在成为植物生物技术中有前景的工具，特别是在改善组织培养技术方面。然而，它们在番茄微繁中的应用还不是很清楚。本研究探讨了CuO NPs对番茄植株离体再生的影响。旨在确定它们在受控条件下促进植物生长发育的有效性。以不同的铜盐CuSO₄·5H₂O、CuCl₂·2H₂O和Cu（NO₃）₂·3H₂O为原料，通过煅烧(Z)- n′-（3-乙氧基-2-羟基苄基）苯并肼铜（II）配合物合成CuO NPs。这些配合物通过FT-IR、UV-Vis光谱、质谱、热重分析（TGA）、磁性研究和摩尔电导进行了表征。利用FT-IR、UV-Vis、PXRD、SEM、TEM等分析了纳米颗粒的结构和形貌。为评价CuO NPs的生物学效应，将不同浓度（0.02、0.2和2.0 mg/L）的CuO NPs分别添加到Murashige和Skoog （MS）培养基中，并在番茄外植体上进行试验。使用单因素方差分析的统计分析证实，与对照组相比，这些增强是显著的（p <； 0.05）。总的来说，本研究强调了CuO NPs的潜力，特别是在优化浓度下，作为植物组织培养中有益的微量营养素添加剂。这些结果支持了它们在提高番茄和其他高价值作物的微繁效率方面的未来应用。

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引用次数: 0

AuNPs/chitosan-functionalized silica aerogel nanocomposite from rice husk for high-performance Pb2+ sensing 壳聚糖/壳聚糖功能化二氧化硅气凝胶纳米复合材料对Pb2+的高性能传感

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-03 DOI: 10.1016/j.nanoso.2025.101587

Quang Minh Pham , Cam Vi Dao Thi , Tuan Anh Nguyen , Anh-Tuan Vu

A novel AuNPs/chitosan/silica aerogel (Au/Cs/SA) nanocomposite was fabricated and applied as an efficient electrochemical sensor for Pb²⁺ detection. Silica aerogel synthesized from rice husk served as a lightweight, highly porous scaffold, providing large surface area and abundant adsorption sites. Chitosan acted as a biopolymer matrix to immobilize gold nanoparticles (AuNPs), prevent aggregation, and introduce amine and hydroxyl groups for strong Pb²⁺ chelation. Uniformly dispersed AuNPs (∼25–35 nm) further enhanced electron transfer and structural stability, while preserving the intrinsic porosity of the aerogel (252 m²/g compared to 267 m²/g for pure SA). Electrochemical analysis demonstrated a significant improvement in conductivity, with the modified electrode achieving a linear response in the range of 0.5–10 µM, a low detection limit of 0.167 µM, and excellent reproducibility (RSD = 0.76 %). Real-sample tests in tap and river water confirmed the sensor’s accuracy, with recovery rates of 98.22 and 106.65 %, respectively. The synergistic integration of AuNPs, chitosan, and silica aerogel resulted in a stable, sensitive, and environmentally sustainable sensing platform. This work provides a promising strategy for developing next-generation electrochemical sensors for monitoring Pb²⁺ and potentially other toxic heavy metals in complex aquatic environments.

制备了一种新型AuNPs/壳聚糖/二氧化硅气凝胶（Au/Cs/SA）纳米复合材料，并将其作为检测Pb2+的高效电化学传感器。以稻壳为原料合成的二氧化硅气凝胶具有体积大、吸附位点丰富、重量轻、多孔性强等优点。壳聚糖作为一种生物聚合物基质，可以固定金纳米粒子（AuNPs），防止聚集，并引入胺和羟基进行强Pb2+螯合。均匀分散的AuNPs（~ 25-35 nm）进一步增强了电子转移和结构稳定性，同时保持了气凝胶的固有孔隙度（252 m2/g，而纯SA为267 m2/g）。电化学分析表明，修饰电极的电导率显著提高，在0.5-10 µM范围内实现线性响应，低检出限为0.167 µM，重复性好（RSD = 0.76 %）。自来水和河水的实际样品测试证实了传感器的准确性，回收率分别为98.22%和106.65 %。AuNPs、壳聚糖和二氧化硅气凝胶的协同整合形成了一个稳定、敏感和环境可持续的传感平台。这项工作为开发下一代电化学传感器提供了一个有前途的策略，用于监测复杂水生环境中Pb2+和潜在的其他有毒重金属。

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引用次数: 0

Rabi oscillation dynamics and Mollow splitting in cylindrical quantum dots under external fields 外场作用下圆柱形量子点的Rabi振荡动力学和Mollow分裂

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-03 DOI: 10.1016/j.nanoso.2025.101593

P.A. Mantashyan , T.A. Sargsian , N. Zeiri , E.M. Kazaryan , C.A. Duque , D.B. Hayrapetyan

Semiconductor quantum dots represent versatile nanoscale systems whose electronic and optical properties can be precisely tuned through their geometry and external perturbations. This paper presents a theoretical investigation of the electronic dynamics in a two-level system confined within a cylindrical GaAs quantum dot embedded in a Ga₁₋ₓAlₓAs matrix. A modified Pöschl–Teller potential model is used to describe the axial confinement, while a parabolic potential is employed to describe the radial confinement. The study focuses on the influence of an external electric field and geometrical parameters on the Rabi oscillation behavior and the resulting Mollow spectrum. The results demonstrate that increasing the electric field intensity enhances the amplitude of Rabi oscillations up to a threshold (F ≈ 2.8 ×10⁵ V/cm), after which amplitude intermixing and saturation occur. Beyond a critical field (F ≈ 1.2 ×10⁶ V/cm), a reappearance of oscillatory gaps is observed, indicating field-induced redistribution between the ground and excited states. Variation of the QD half-width (3–7 nm) affects the oscillation frequency but not its amplitude, underscoring the role of confinement geometry in coherent carrier dynamics. The calculated Mollow spectrum exhibits symmetric sideband splitting with increasing Rabi frequency, maintaining resonance with the laser field and revealing dephasing-induced linewidth broadening. These results provide insight into the coherent control of charge-carrier dynamics in semiconductor quantum dots, contributing to the design of tunable quantum optoelectronic devices.

半导体量子点代表了多功能纳米级系统，其电子和光学特性可以通过其几何形状和外部扰动精确调谐。本文提出了一个理论研究在一个圆柱形的GaAs量子点内嵌在一个Ga₁瞪ₓAlₓAs矩阵的两能级系统的电子动力学。采用改进的Pöschl-Teller势模型描述轴向约束，采用抛物线势模型描述径向约束。研究了外电场和几何参数对拉比振荡行为和由此产生的Mollow谱的影响。结果表明，增加电场强度会使拉比振荡的振幅增强到一个阈值（F≈2.8 ×10 5 V/cm），之后会出现振幅混合和饱和。在临界场（F≈1.2 ×10 26 V/cm）之外，观察到振荡间隙的再现，表明场诱导的基态和激发态之间的再分布。量子点半宽度（3-7 nm）的变化影响振荡频率，但不影响其振幅，强调了约束几何在相干载流子动力学中的作用。计算得到的Mollow谱随Rabi频率的增加呈现对称的边带分裂，与激光场保持共振，显示出脱相引起的线宽展宽。这些结果为半导体量子点中载流子动力学的相干控制提供了见解，有助于可调谐量子光电器件的设计。

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引用次数: 0

Synthesis and self-assembly behavior investigation of paclitaxel-riboflavin conjugates for targeted drug delivery to tumor cells 靶向给药肿瘤细胞紫杉醇-核黄素偶联物的合成及自组装行为研究

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-02 DOI: 10.1016/j.nanoso.2025.101588

Dmitry V. Beigulenko , Vladimir O. Orlov , Ekaterina S. Kazakova , Inna V. Zhezher , Aleksander S. Peregudov , Julia A. Malinovskaya , Konstantin A. Kochetkov

Paclitaxel is one of the commonly used anticancer drugs, however it has two major drawbacks such as low solubility and selectivity towards tumor cells. A promising approach to mitigating these problems is the development of targeted paclitaxel delivery systems based on its conjugates, capable of self-assembly. Herein we present novel paclitaxel-riboflavin conjugates that form spherical nanoparticles, which can be simply prepared by nanoprecipitation technique. The nanostructures are characterized by narrow size distribution and colloidal stability. Such nanoparticles can be considered as potential delivery systems for paclitaxel.

紫杉醇是常用的抗癌药物之一，但其对肿瘤细胞的溶解度和选择性较低。缓解这些问题的一个有希望的方法是基于其偶联物的靶向紫杉醇递送系统的发展，能够自组装。本文提出了一种新的紫杉醇-核黄素缀合物，它可以形成球形纳米颗粒，可以通过纳米沉淀法简单地制备。纳米结构具有尺寸分布窄、胶体稳定性好等特点。这种纳米颗粒可以被认为是紫杉醇的潜在递送系统。

引用次数: 0

Innovative approach to purifying petroleum refinery wastewater: The role of photocatalytic functionalized MWCNTs 炼油废水净化的创新方法：光催化功能化MWCNTs的作用

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-02 DOI: 10.1016/j.nanoso.2025.101586

Ahmed A. Hadi , Rawaa A. Faris , Khudhair A.K. Al‑Rudaini , Zainab F. Mahdi

The treatment of wastewater generated by oil refineries employing photocatalysis offers a new, environmentally friendly approach. Carbon nanotubes that are multiwall and functionalized (f-MWCNTs) provide a catalyst for this method and utilize sunlight as the energy source. Material and Methods: f-MWCNTs were synthesized from stock solutions of wastewater from Samawah refinery, using ultrasonic-assisted oxidation. To examine the success of the method, we employed FTIR, XRD, FESEM and zeta potential measurements to show that chemical reactivity and absorption capacity increased with f-MWCNTs. These methods revealed that upscale manufacturing will meet any increase in demand for larger supplies. Why Do It: The resulting course of this research was to answer this question. We found that we could use Ordinary Sunlight or sunlight accompanied with a DPSS (diode pumped solid state) laser (532 nm, 120 mW/mm2) as energy source for treatment by f-MWCNTs. Results: The degradation kinetics of refinery wastewater under photocatalysis showed a good fit with pseudo-second-order model, verifying an important connection between the adsorption of pollutants and available active sites on f-MWCNTs. Data indicate that under sunlight, the rate constant (K) was 0.0025 g· mg^-1 · min^-1 and maximum adsorption capacity 55.55 mg/g. Even though its adsorption capacity was smaller (30.30 mg/g), the DPSS laser's irradiation produced a higher rate constant (K=0.0115 g·mg^). Under the conditions of the DPSS laser, we were told that degradation rates peak 71.5 % and 80.91 % under sunlight they%E2 %€%99re reported.

利用光催化处理炼油厂产生的废水提供了一种新的、环保的方法。多壁功能化碳纳米管（f-MWCNTs）为该方法提供了催化剂，并利用阳光作为能源。材料和方法：以Samawah炼油厂废水原液为原料，采用超声辅助氧化法合成f-MWCNTs。为了验证该方法的成功，我们使用了FTIR、XRD、FESEM和zeta电位测量结果表明，添加了f-MWCNTs后，化学反应性和吸收能力都有所提高。这些方法表明，高档制造业将满足任何增加的需求，更大的供应。为什么这样做：这项研究的结果就是要回答这个问题。我们发现我们可以使用普通阳光或阳光伴随着DPSS（二极管泵浦固体）激光器（532 nm, 120 mW/mm2）作为能量源来处理f-MWCNTs。结果：光催化下炼油厂废水的降解动力学符合拟二阶模型，验证了f-MWCNTs对污染物的吸附与活性位点之间的重要联系。数据表明，在日光下，吸附速率常数(K)为0.0025 g·mg^-1·min^-1，最大吸附量为55.55 mg/g。虽然DPSS激光的吸附量较小（30.30 mg/g），但其辐照速率常数较高（K=0.0115 g·mg^）。在DPSS激光条件下，我们得知在日光下降解率峰值为71.5 %和80.91 %，他们报道了%E2 %€%99。

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