Nano-Structures & Nano-Objects最新文献_第2页

Eco-engineered Ni/Al composites with Uncaria gambir leaf extract: A selective photocatalyst for anionic dye removal 含钩藤叶提取物的生态工程镍/铝复合材料：一种去除阴离子染料的选择性光催化剂

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2026-01-05 DOI: 10.1016/j.nanoso.2026.101614

Jefri Jefri , Najma Annuria Fithri , Yulizah Hanifah , Alfan Wijaya , Amri Amri , Nur Ahmad , Aldes Lesbani

In this study, Ni/Al composites modified with gambier leaf extract (Ni/Al/Ug) were successfully synthesized using the coprecipitation method and then characterized using XRD, FTIR, BET, SEM, TEM, Zeta Potential, UV–Vis DRS, and XPS. The characterization results indicate that the layered Ni/Al structure remains intact after modification, with the presence of polyphenolic groups from Ug bound to the surface. The specific surface area increases, the morphology becomes more porous, and the bandgap energy decreases, thereby enhancing photocatalytic activity. Performance testing showed that Ni/Al–Ug exhibits high selectivity toward Reactive Violet (RV) compared to four other dyes (DY, RY, DO, and RR), attributed to enhanced π–π stacking interactions and electrostatic interactions mediated by Ug. Although the adsorption capacity decreases compared to Ni/Al, the photodegradation efficiency significantly increases, especially under optimal conditions of pH 3 and reaction time of 120 min, with RV degradation reaching 87.63 %. Kinetic studies followed a pseudo-first-order model with a rate constant of 0.01549 min⁻¹, nearly twice that of Ni/Al. Reusability tests demonstrated high stability with 70.53 % efficiency after five cycles. Scavenger tests indicated that hydroxyl radicals (•OH) and superoxide radicals (•O₂^-) are the dominant reactive species in the photodegradation mechanism. Overall, Ni/Al/Ug has proven to be a selective, efficient, and stable material for the treatment of anionic dye waste.

本研究采用共沉淀法成功合成了甘比尔叶提取物（Ni/Al/Ug）改性的Ni/Al复合材料，并用XRD、FTIR、BET、SEM、TEM、Zeta电位、UV-Vis DRS和XPS对其进行了表征。表征结果表明，改性后的层状Ni/Al结构保持完整，并存在从Ug结合到表面的多酚基团。比表面积增大，形貌更加多孔，带隙能量降低，从而增强光催化活性。性能测试表明，与其他四种染料（DY， RY， DO和RR）相比，Ni/ Al-Ug对活性紫（RV）具有较高的选择性，这归因于Ug介导的π -π堆积相互作用和静电相互作用的增强。虽然吸附量与Ni/Al相比有所下降，但光降解效率显著提高，特别是在pH为3、反应时间为120 min的最佳条件下，RV的降解率达到87.63 %。动力学研究遵循伪一阶模型，速率常数为0.01549 min−1，几乎是Ni/Al的两倍。可重用性测试表明，经过5次循环后，效率为70.53 %。清道夫实验表明，羟基自由基（•OH）和超氧自由基（•O2-）是光降解机制中的主要活性物质。总的来说，Ni/Al/Ug已被证明是一种选择性、高效和稳定的处理阴离子染料废料的材料。

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引用次数: 0

Eco-friendly conversion of corn husk agro-waste into microcrystalline cellulose and cellulose nanofibers 玉米壳农业废弃物环保转化为微晶纤维素和纤维素纳米纤维

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2026-01-03 DOI: 10.1016/j.nanoso.2025.101610

Nazym Sagiyeva , Kydyrmolla Akatan , Ainur Battalova , Gulfaridat Kampitova , Esbol Shaimardan , Ainur Kabdrakhmanova , Sana Kabdrakhmanova , Madiar Beisebekov

Efficient use of bioresources is essential in order to achieve sustainable development goals, and plays an important role in the reduction of any environmental impact and the improvement of resource efficiency. To this end, the present study investigates the process of obtaining microcrystalline cellulose (MCC) and cellulose nanofibers (CNFs) from corn husks (CHs), which are agricultural waste, under “mild” conditions by employing the organosolvent oxidation method using peroxyacetic acid (PAA). The results obtained at an effective hydromodule of CH:PAA 1:18 g/mL, were: MCC yield – 51.60 %, α-cellulose content – 58.73 ± 3 %, residual lignin – 12.92 ± 0.5 %, hemicellulose – 13.8 ± 0.5 %, ash content (SiO₂) – 10.73 ± 0.5 %, and moisture content – 3.57 ± 0.5 %. Furthermore, the effective MCC:FA ratio that was used to obtain CNFs from MCC_CH using formic acid (FA) was found to be 1/30 g/mL. The CNF yield achieved with this ratio was 68.67 %, and the average particle size was reduced by 177 times in length and 33 times in width, as compared to the initial MCC_CH size. The ζ-potential of the resulting MCC was −19.3 mV and the crystallinity index was 80.9 %. The effectiveness of the PAA/FA approach arises from mild oxidation that selectively removes amorphous cellulose, while preserving crystalline regions, thereby maintaining high crystallinity and contributing to favorable material yields. The physicochemical properties of the resulting high-quality cellulose micro- and nanofibers were compared, and found to have been obtained at good efficiency. The MCC and CNFs obtained have excellent potential for use in the medical field as essential components, and in the development of bioplastics and biocomposites, among other applications.

有效利用生物资源对于实现可持续发展目标至关重要，并在减少任何环境影响和提高资源效率方面发挥重要作用。为此，本研究研究了在“温和”条件下，利用过氧乙酸（PAA）有机溶剂氧化法从农业废弃物玉米壳（CHs）中获得微晶纤维素（MCC）和纤维素纳米纤维（CNFs）的工艺。获得的结果的有效量模数CH: PAA 1:18 g / mL,是:MCC收益率- 51.60 %,α纤维素含量- 58.73 ± 3 %,残余木质素- 12.92 ±0.5  %,半纤维素- 13.8 ±0.5  %,灰分(二氧化硅)- 10.73 ±0.5  %,和含水率- 3.57 ±0.5  %。此外，使用甲酸（FA）从MCCCH中获得CNFs的有效MCC:FA比为1/30 g/mL。该比例下的CNF产率为68.67 %，平均粒径与初始MCCCH粒径相比，长度减小了177倍，宽度减小了33倍。所得MCC的ζ电位为−19.3 mV，结晶度指数为80.9 %。PAA/FA方法的有效性源于温和氧化，选择性地去除无定形纤维素，同时保留结晶区域，从而保持高结晶度并有助于有利的材料产量。对制备的高质量纤维素微纤维和纳米纤维的理化性质进行了比较，发现制备效率高。所获得的MCC和CNFs在医疗领域作为基本组件，以及在生物塑料和生物复合材料的开发以及其他应用方面具有极好的潜力。

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引用次数: 0

Recent advances in conducting polymer nanocomposites for non-invasive sweat-based biosensors: A review 无创汗液生物传感器用导电聚合物纳米复合材料的研究进展

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2026-01-03 DOI: 10.1016/j.nanoso.2025.101609

Lovepreet Singh , Harshita Jain , Sakshi Sharma , Nishel Saini , Anuradha Kashyap , Vishal Singh

The demand for non-invasive, continuous health monitoring has accelerated research on wearable biosensors for real-time sweat analysis. Conducting polymer nanocomposites (CPNs), particularly those derived from polyaniline (PANI), polypyrrole (PPy), and PEDOT:PSS, have gained prominence owing to their unique combination of electrical conductivity, redox activity, mechanical flexibility, and biocompatibility. Current review broadly survey wearable biosensors, this article specifically highlights the engineering strategies and structure–property relationships of CPNs for sweat-based applications. Recent advances in nanomaterial integrationincluding carbon nanotubes, graphene derivatives, MXenes, and metal nanoparticlesare critically examined for their role in enhancing electron transfer, stability, and analyte selectivity. Fabrication approaches such as electropolymerization, inkjet printing, electrospinning, and 3D printing are compared in terms of scalability, reproducibility, and device durability. Transduction mechanisms like electrochemical, chemiresistive, and colorimetricare discussed. Device-level considerations, including substrate flexibility, microfluidic sweat handling, and wireless data transmission, are also analyzed. Key challenges like dopant leaching, film cracking under mechanical deformation, and signal drift in humid environments are identified, along with strategies for improved stability and performance. By integrating polymer engineering insights with wearable electronics, this review provides a forward-looking framework for designing next-generation sweat biosensors based on conducting polymer nanocomposites.

对无创、连续健康监测的需求加速了可穿戴生物传感器的研究，用于实时汗液分析。导电聚合物纳米复合材料（cpn），特别是由聚苯胺（PANI）、聚吡咯（PPy）和PEDOT:PSS衍生的聚合物纳米复合材料，由于其独特的导电性、氧化还原活性、机械柔韧性和生物相容性的组合而获得了突出的地位。本文综述了可穿戴生物传感器的研究现状，重点介绍了基于汗液的cpn的工程策略和结构-性能关系。纳米材料集成的最新进展，包括碳纳米管、石墨烯衍生物、MXenes和金属纳米颗粒，对它们在增强电子转移、稳定性和分析物选择性方面的作用进行了严格的研究。制造方法，如电聚合、喷墨打印、静电纺丝和3D打印在可扩展性、可重复性和设备耐用性方面进行了比较。转导机制，如电化学，化学抗性和比色法进行了讨论。还分析了器件级考虑因素，包括衬底灵活性，微流体汗液处理和无线数据传输。主要挑战包括掺杂剂浸出、机械变形下薄膜开裂、潮湿环境下的信号漂移，以及提高稳定性和性能的策略。通过将聚合物工程见解与可穿戴电子技术相结合，本综述为设计基于导电聚合物纳米复合材料的下一代汗液生物传感器提供了前瞻性框架。

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引用次数: 0

Engineered TiO₂ thin films for photocatalytic, electrochemical, and bactericidal applications: A comprehensive review 用于光催化，电化学和杀菌应用的工程二氧化钛薄膜：综合综述

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-30 DOI: 10.1016/j.nanoso.2025.101607

Mehanaz Iqbal , Vijayashree N. Hegde , P. Mohan Kumar , P.R. Deepthi

Titanium dioxide (TiO₂) thin films are widely studied for their multifunctionality, with proven applications in photocatalysis, self-cleaning surfaces, and antimicrobial coatings. By tuning composition and microstructure, TiO₂’s optical and catalytic performance under UV and visible light can be optimized. Metal dopants like platinum, silver, and iron enhance light absorption, charge separation, and catalytic activity. Meanwhile, synthesis methods such as sol-gel and hydrothermal processes control critical properties like porosity, crystallinity, and surface area. TiO₂ also exhibits strong bactericidal effects by generating reactive oxygen species under light, disrupting microbial cells. Doping and co-catalyst integration further amplify this antimicrobial action. The formation of heterojunctions with other semiconductors or graphene materials improves both photocatalytic and antibacterial efficiency by minimizing electron-hole recombination. These advancements position TiO₂ thin films as promising materials for environmental remediation, clean energy, water treatment, and healthcare. Ongoing research on doping, film structure, and fabrication continues to drive improvements in their performance and durability.

二氧化钛（TiO 2）薄膜因其多功能性而被广泛研究，在光催化，自清洁表面和抗菌涂层方面具有成熟的应用。通过调整组成和微观结构，可以优化tio2在紫外和可见光下的光学和催化性能。金属掺杂剂如铂、银和铁增强光吸收、电荷分离和催化活性。同时，溶胶-凝胶法和水热法等合成方法控制着孔隙度、结晶度和表面积等关键性能。二氧化钛还表现出很强的杀菌作用，在光线下产生活性氧，破坏微生物细胞。掺杂和共催化剂的整合进一步增强了这种抗菌作用。与其他半导体或石墨烯材料形成异质结，通过减少电子-空穴复合，提高光催化和抗菌效率。这些进展使二氧化钛薄膜成为环境修复，清洁能源，水处理和医疗保健的有前途的材料。对掺杂、薄膜结构和制造的持续研究将继续推动其性能和耐用性的提高。

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引用次数: 0

Studying the physical properties of LaFeO3, La0.5Sm0.5FeO3, and La0.5Nd0.5FeO3 perovskite nanoparticles with a comparative photocatalytic degradation of Congo Red dye 研究了LaFeO3、La0.5Sm0.5FeO3和La0.5Nd0.5FeO3钙钛矿纳米粒子的物理性质，并对刚果红染料进行了光催化降解

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-26 DOI: 10.1016/j.nanoso.2025.101602

M.M. Arman , Eman S. Mansor

The perovskite nanoparticles LaFeO₃ (LFO), La_0.5Sm_0.5FeO₃ (LSFO), and La_0.5Nd_0.5FeO₃ (LNFO) were prepared in a single phase using the citrate method. The X-ray diffraction (XRD) pattern illustrates the nanoparticles were formed in an orthorhombic structure with a crystallite size in the range of 36–40 nm. The FESEM images show the presence of pores in the morphology of the samples, leading to an increase of the surface to volume ratio of the samples. The saturation magnetization of LFO raised from 0.57 emu/g to 1.46 emu/g for LSFO and to 2.44 emu/g for LNFO samples. The sample LNFO has the lowest direct energy gap (1.903 eV). The LNFO exhibited enhanced optical absorbance characteristics in comparison with neat LFO. The degrading capacities of the produced LNFO were investigated at xenon light illumination and in an aqueous congo red (CR) solution. The photocatalytic effectiveness of the LFO, and LNFO were around 85 % and 99.9 % respectively. The condition of degradation was optimized. Our research indicates that LNFO may serve as photocatalysts to break down the congo red dye with a removal percentage of more than 99 % at pH3, dose 1.5 g/L and dye concentration 25 mg/L.

采用柠檬酸盐法制备了钙钛矿纳米粒子LaFeO3 （LFO）、La0.5Sm0.5FeO3 （LSFO）和La0.5Nd0.5FeO3 （LNFO）。x射线衍射（XRD）结果表明，纳米颗粒呈正交结构，晶粒尺寸在36 ~ 40 nm之间。FESEM图像显示样品形貌中存在孔隙，导致样品的表面体积比增加。LFO样品的饱和磁化强度从0.57 emu/g提高到1.46 emu/g， LNFO样品的饱和磁化强度提高到2.44 emu/g。样品LNFO的直接能隙最小（1.903 eV）。与纯LFO相比，LNFO表现出增强的光吸收特性。研究了所制备的LNFO在氙灯照射和刚果红水溶液中的降解能力。LFO和LNFO的光催化效率分别为85 %和99.9 %左右。优化了降解条件。研究表明，在pH3、剂量1.5 g/L、染料浓度25 mg/L条件下，LNFO可作为光催化剂降解刚果红染料，去除率可达99 %以上。

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引用次数: 0

Photocatalytic efficiency of nickel-doped copper ferrite in organic dye decomposition 掺镍铁氧体铜在有机染料分解中的光催化效率

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-23 DOI: 10.1016/j.nanoso.2025.101603

Julia Mazurenko , Larysa Kaykan , Sijo A K , Antoni Zywczak , Mateusz Marzec , Liliia Turovska , Katarina Hreus

Nickel-substituted copper ferrite nanoparticles were successfully synthesized using a citrate–nitrate sol-gel autocombustion route and evaluated as photocatalysts for the degradation of organic dyes. X-ray diffraction confirmed that all compositions crystallized into a cubic spinel structure (Fd3m), with crystallite sizes in the nanoscale range. X-ray photoelectron spectroscopy revealed that Fe^3 + ions were predominant and distributed across tetrahedral and octahedral sites, while Ni²⁺ and Cu²⁺ preferentially occupied octahedral positions. BET analysis revealed specific surface areas of 7–16 m²/g, with Cu-rich samples exhibiting higher porosity. Magnetic measurements confirmed magnetic behavior for all Cu_1-xNi_xFe₂O₄ (0 ≤ x ≤ 1.0) samples, with saturation magnetization increasing from 28.7 emu g⁻¹ to 58.9 emu g⁻¹, ensuring efficient magnetic separation and reusability of the nanoparticles in photocatalytic applications. Optical studies demonstrated a systematic increase in the direct band gap energy from 1.80 eV for CuFe₂O₄ to 2.29 eV for NiFe₂O₄, correlating with decreased Urbach energies and suggesting improved structural order with Ni incorporation. Photocatalytic efficiency was investigated using Methylene Blue (MB), Congo Red (CR), and Malachite Green (MG) under visible light and H₂O₂. The maximum degradation rate was observed for Cu_0.8Ni_0.2Fe₂O₄ at pH 10 with k_L–H = 0.080 min⁻¹ and 99 % MB removal within 180 min, while CR degradation peaked at x = 0.4 (96 %) and MG at x ≥ 0.4 (k_L–H = 0.115 min⁻¹, ∼99 % removal). The catalysts maintained over 95 % activity after five reuse cycles, confirming excellent structural stability and magnetic recoverability. These findings demonstrate that Cu/Ni co-substitution effectively tunes the band structure, enhances redox activity, and enables sustainable photocatalytic performance for wastewater treatment applications.

采用柠檬酸盐-硝酸盐溶胶-凝胶自燃烧的方法成功合成了镍取代铁酸铜纳米颗粒，并对其作为降解有机染料的光催化剂进行了评价。x射线衍射证实，所有成分结晶成立方尖晶石结构（Fd3m），晶粒尺寸在纳米级范围内。x射线光电子能谱显示，Fe3 +离子占主导地位，分布在四面体和八面体位置，而Ni2+和Cu2+优先占据八面体位置。BET分析显示，比表面积为7-16 m2/g，富cu样品具有较高的孔隙度。磁性测量证实了所有Cu1-xNixFe2O4（0 ≤x ≤ 1.0）样品的磁性行为，饱和磁化强度从28.7 emu g−1增加到58.9 emu g−1，确保了纳米颗粒在光催化应用中的高效磁分离和可重复使用。光学研究表明，CuFe2O4的直接带隙能量从1.80 eV增加到NiFe2O4的2.29 eV，这与Urbach能量的降低有关，表明Ni的掺入改善了结构秩序。研究了亚甲基蓝（MB）、刚果红（CR）和孔雀石绿（MG）在可见光和H2O2下的光催化效率。最高降解率为观察与kL-H Cu0.8Ni0.2Fe2O4 pH值10 = 0.080  分钟−1和99 % MB 180 分钟内删除,而CR退化达到峰值0.4 x = (96 %)和MG x ≥0.4 (kL-H = 0.115 分钟−1∼99 %去除)。经过5次循环使用后，催化剂的活性保持在95% %以上，具有良好的结构稳定性和磁性可恢复性。这些发现表明，Cu/Ni共取代有效地调整了能带结构，增强了氧化还原活性，并使废水处理应用的光催化性能可持续。

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引用次数: 0

Hyalurosomes nanoformulation strategies for intra-articular and localized drug delivery: Transforming the management of osteoarthritis 关节内和局部给药的透明质体纳米配方策略：改变骨关节炎的管理

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-22 DOI: 10.1016/j.nanoso.2025.101605

Md. Azhar , Sathvik Belagodu Sridhar , Javedh Shareef , Tarun Wadhwa , Dhanalekshmi Unnikrishnan Meenakshi , Rishabha Malviya

Osteoarthritis (OA) is a disease that leads to impaired function and chronic pain in joints. Existing medications are symptomatic and have weak joint retention and may cause systemic drug side effects. This review discusses hyalurosomes, lipid vesicles combined with hyaluronic acid (HA), as potential future intra-articular (IA) delivery systems to provide improved targeting of cartilage, longer residence times, and the possibility of combination therapy in OA. The review is performed by a comprehensive search (cut-off: 25 August 2025) via PubMed, Scopus, Web of Science, Embase, publisher platforms (MDPI, Elsevier, SpringerLink), preprint servers, clinical trial registries, regulatory agencies (FDA, EMA, CDSCO), patent databases (Google Patents, WIPO, USPTO), conference proceedings, and gray literature including manufacturer labels and SSEDs. The results show that hyalurosomes exhibit improved IA sustained release, lower systemic exposure, and enhanced cartilage penetration compared to standard liposomes and soluble drugs. Combining visco-supplementation with controlled pharmacotherapy, such as a dual-function design, offers potential pharmacokinetic and pharmacodynamic benefits, including analgesic and chondroprotective effects in preclinical models. However, the limited number of studies may lead to varied findings. The main challenges for clinical translation include scale-up feasibility, sterilization issues, and regulatory uncertainty. Hyalurosomes are a biologically rational delivery system that could help localize multimodal therapy and bring OA treatment closer to disease-modifying options. There is a need to address manufacturing, stability, and uniform preclinical criteria before clinical trials can be used to determine efficacy and facilitate global adoption. Future research should involve controlled animal studies, pharmacokinetics, and patient outcome-focused assessments.

骨关节炎（OA）是一种导致关节功能受损和慢性疼痛的疾病。现有的药物是有症状的，关节保留力弱，可能引起全身药物副作用。这篇综述讨论了透明质体、脂质囊泡与透明质酸（HA）联合作为未来潜在的关节内（IA）递送系统，以提供更好的软骨靶向性、更长的停留时间和OA联合治疗的可能性。通过PubMed、Scopus、Web of Science、Embase、出版商平台（MDPI、Elsevier、SpringerLink）、预印服务器、临床试验注册、监管机构（FDA、EMA、CDSCO）、专利数据库（谷歌Patents、WIPO、USPTO）、会议记录和灰色文献（包括制造商标签和sds）进行综合检索（截止日期：2025年8月25日）。结果表明，与标准脂质体和可溶性药物相比，透明质体表现出更好的IA持续释放，更低的全身暴露和增强的软骨穿透。将黏液补充与控制药物治疗相结合，如双重功能设计，在临床前模型中提供潜在的药代动力学和药效学益处，包括止痛和软骨保护作用。然而，有限的研究数量可能导致不同的发现。临床翻译的主要挑战包括扩大可行性、灭菌问题和监管不确定性。透明质体是一种生物学上合理的传递系统，可以帮助定位多模式治疗，使OA治疗更接近于疾病改善方案。在临床试验用于确定疗效和促进全球采用之前，需要解决生产、稳定性和统一的临床前标准问题。未来的研究应包括对照动物研究、药代动力学和以患者结果为中心的评估。

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引用次数: 0

Honey-mediated green synthesis and systematic optimization of Ni(OH)₂ nanoparticles with oligochitosan surface modification: Structural characterization, enhanced stability, and antibacterial biocompatibility 蜂蜜介导的低聚壳聚糖表面修饰的Ni(OH) 2纳米颗粒的绿色合成和系统优化：结构表征，增强的稳定性和抗菌生物相容性

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-22 DOI: 10.1016/j.nanoso.2025.101606

Saidun Fiddaroini , Berlian Zetta Batari , Budi Mulyati , Ahmad Luthfi Fahmi , Yosep Yuswanto Tri Ananda , Andini , Moh. Farid Rahman , Akhmad Sabarudin

The alarming rise of antimicrobial resistance (AMR) has prompted the search for alternative strategies beyond conventional antibiotics. Nickel hydroxide nanoparticles (Ni(OH)₂ NPs) are promising antimicrobial agents, yet their practical application is hindered by colloidal instability and potential cytotoxicity. Herein, we report a green and optimized synthesis of Ni(OH)₂ nanoparticles using cottonwood (Ceiba pentandra) honey as a natural bioreductor, followed by surface modification with oligochitosan to enhance stability and biocompatibility. The synthesis parameters were systematically optimized by varying pH, honey concentration, precursor concentration, and reaction time. The optimal conditions (pH 10, 5 % honey, 0.05 M precursor, and 30 min) were selected based on yielded Ni(OH)₂ nanoparticles with the highest UV–Vis absorbance intensity, the strongest Ni–OH fingerprint bands in FTIR, and the most uniform particle morphology. Morphological analyses confirmed the formation of quasi-spherical nanoparticles with the particle size is ∼56 nm. Surface modification with oligochitosan markedly increased the zeta potential (+60.99 mV) and hydrodynamic size, indicating strong electrosteric stabilization. Antibacterial evaluation revealed a substantial enhancement in activity after oligochitosan coating, with minimum inhibitory concentrations (MICs) reduced by 3.62-fold against Staphylococcus aureus and 4.25-fold against Pseudomonas aeruginosa compared to uncoated Ni(OH)₂ nanoparticles. Toxicity evaluation via brine shrimp lethality test indicated improved biocompatibility of the coated nanocomposites. Collectively, this study establishes a sustainable and effective strategy for producing stable, bioactive Ni(OH)₂–oligochitosan nanocomposites with strong potential as next-generation antibacterial materials.

抗菌素耐药性（AMR）的惊人上升促使人们寻找传统抗生素之外的替代策略。氢氧化镍纳米颗粒（Ni（OH）₂NPs）是一种很有前途的抗菌剂，但其实际应用受到胶体不稳定性和潜在细胞毒性的阻碍。在此，我们报道了一种绿色和优化的Ni(OH) 2纳米颗粒的合成方法，该合成方法使用棉杨（Ceiba pentandra）蜂蜜作为天然生物载体，然后用低聚壳聚糖对其表面进行修饰，以提高稳定性和生物相容性。通过改变pH、蜂蜜浓度、前驱体浓度和反应时间对合成参数进行了系统优化。在pH值为10，蜂蜜含量为 %，前驱体浓度为0.05 M，反应时间为30 min的条件下，制备出的Ni(OH) 2纳米颗粒具有最高的紫外-可见吸收强度，FTIR中Ni - OH指纹带最强，颗粒形貌最均匀。形态分析证实形成了准球形纳米颗粒，粒径为~ 56 nm。低壳聚糖表面改性显著提高了zeta电位（+60.99 mV）和水动力尺寸，具有较强的电稳定性。抗菌评价显示，低聚壳聚糖包被后的活性显著增强，与未包被的Ni(OH) 2纳米颗粒相比，对金黄色葡萄球菌的最低抑制浓度（mic）降低了3.62倍，对铜绿假单胞菌的最低抑制浓度（mic）降低了4.25倍。盐水对虾毒力试验表明，包覆纳米复合材料的生物相容性得到改善。总之，本研究为制备稳定、具有生物活性的Ni(OH) 2 -低聚壳聚糖纳米复合材料建立了一种可持续有效的策略，该复合材料具有作为下一代抗菌材料的强大潜力。

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引用次数: 0

Ag nanoparticles via PVP synthesis: Evidence of nanohydrogel formation, characterization, and review of nanomedicine applications 通过PVP合成银纳米粒子：纳米水凝胶形成的证据，表征和纳米医学应用的回顾

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-13 DOI: 10.1016/j.nanoso.2025.101601

Nina Bogdanchikova , Jorge Noé Díaz de León , Mario Humberto Farías Sánchez , Gustavo Alonso Hirata Flores , Miguel Ángel Pastrana Corral , Alexey Pestryakov , Diana Garibo Ruiz

In this work, the characterization of Ag nanoparticles (AgNPs) and their applications in nanomedicine are discussed. Several reports in the literature mentioned that AgNPs (Argovit™) possess high biomedical activity, high stability, and low toxicity; however, the reasons for these properties are still unclear. Therefore, five lots of AgNPs prepared under various conditions were investigated via HRTEM, UVvisible spectroscopy, XPS, and luminescence techniques. The results revealed a series of experimental findings inconsistent with the current AgNP model reported, including a Ag core capped by PVP molecules. Here, we propose a novel structural model for AgNP formulations that is in good agreement with the physicochemical characterization, which consists of PVP nanohydrogels incorporating Ag cores and/or Ag cores capped by PVP molecules.

本文讨论了银纳米粒子的性质及其在纳米医学中的应用。文献中的几篇报道提到AgNPs （Argovit™）具有高生物医学活性、高稳定性和低毒性；然而，产生这些特性的原因尚不清楚。因此，采用HRTEM、紫外可见光谱、XPS和发光技术对不同条件下制备的5批AgNPs进行了研究。结果揭示了一系列与目前报道的AgNP模型不一致的实验发现，包括由PVP分子覆盖的Ag核。在这里，我们提出了一种新的AgNP配方结构模型，该模型与物理化学特性非常吻合，它由包含Ag核和/或由PVP分子覆盖的Ag核的PVP纳米水凝胶组成。

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Enhancing the light extraction efficiency in micro light-emitting diodes integrating advanced nanophotonic structures 提高集成先进纳米光子结构的微型发光二极管的光提取效率

IF 5.45 Q1 Physics and Astronomy

Nano-Structures & Nano-Objects

Pub Date : 2025-12-12 DOI: 10.1016/j.nanoso.2025.101585

Monica N. Kalbande , Tejaswini G. Panse , Yashika A. Gaidhani , Rupali S. Balpande , Tejas R. Patil , Yoginee S. Pethe , Latika Pinjarkar , Lowlesh N. Yadav , Nischal Puri , Aseel Smerat , Vikrant S. Vairagade

Applications of high-efficiency micro- light-emitting diode (LED) displays are rapidly increasing to realize next-generation displays and augmented reality systems. However, the Light Extraction Efficiency (LEE) still lags in micro-LED arrays primarily due to inherent optical losses and total internal reflection as well as non-uniform angular emission. The current approaches, such as planar gradient-index (GRIN) structures and conventional metasurfaces, are indeed unable to yield uniform and scalable performance for dense LED configurations. This work addresses these limitations by the introduction of innovative nanophotonic structures toward maximizing LEE, uniformity, and brightness in micro-LED arrays. These proposed approaches are: (1) Topology-Optimized GRIN Metastructures, engineered using inverse design to mitigate Fresnel losses and total internal reflection, thus achieving 25–30 % efficiency improvement over planar GRIN systems; (2) Polarization-Tailored Hyperbolic Metamaterial Nanogratings, which increase directional emission by 2-fold and brightness by 30 %; (3) 3D Multi-Layer Metasurfaces integrated with quantum dots, in which peak emission intensity can be amplified by 3 times by adjusting their phases and amplitudes to optimal values; (4) Anti-reflective light-trapping coatings that suppress back-reflection up to 95 % and enhance extraction efficiency by 1.5 fold; and (5) Reconfigurable Nanostructures with Adaptive Quantum Dots capable of dynamically optimizing the light extraction for different conditions, thereby increasing efficiency up to 30–50 %. Together these methods improved LEE, spectral tunability, and angular brightness, validated by numerical simulations and preliminary experiments. These results show transformative impacts which provide scalable high-performance solutions for ultra-bright and energy-efficient micro-LED displays with new benchmarks for display technology innovation for different scenarios.

高效微型发光二极管（LED）显示器的应用正在迅速增加，以实现下一代显示和增强现实系统。然而，由于固有的光学损耗和全内反射以及角发射不均匀，微型led阵列的光提取效率（LEE）仍然滞后。目前的方法，如平面梯度指数（GRIN）结构和传统的超表面，确实无法为密集LED配置提供均匀和可扩展的性能。这项工作通过引入创新的纳米光子结构来解决这些限制，以最大限度地提高微型led阵列的LEE，均匀性和亮度。这些建议的方法是：(1)拓扑优化的GRIN元结构，利用逆向设计来减轻菲涅耳损失和全内反射，从而实现比平面GRIN系统提高25-30 %的效率；(2)偏振定制双曲超材料纳米光栅，定向发射提高2倍，亮度提高30% %；(3)与量子点集成的3D Multi-Layer metasurst，通过调整量子点的相位和幅值，峰值发射强度可放大3倍；(4)抗反射捕光涂层，可抑制95 %的背反射，提取效率提高1.5倍；(5)具有自适应量子点的可重构纳米结构，能够动态优化不同条件下的光提取，从而将效率提高到30 - 50% %。通过数值模拟和初步实验验证，这些方法提高了LEE、光谱可调性和角亮度。这些结果显示了变革性的影响，为超亮和节能的微型led显示屏提供了可扩展的高性能解决方案，为不同场景的显示技术创新提供了新的基准。

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引用次数: 0