Materials Today Nano最新文献_第2页

Highly dispersed two-dimensional molybdenum disulfide nanofluids for heat dissipation enhancement in high-power electronic chips 高分散二维二硫化钼纳米流体用于高功率电子芯片的散热增强

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2026-01-13 DOI: 10.1016/j.mtnano.2026.100756

Chan Lu , Lei Huang , Jie Li , Fangqiao Zheng , Zhengyi Lan , Dongyu Li , Hangrong Chen , Nanjing Hao , Ming Ma

The application of nanofluid technology in microchannel flow boiling heat transfer systems represents an effective approach for enhancing the cooling efficiency of electronic devices. However, conventional nanofluids generally suffered from complex preparation processes, insufficient stability, and uncontrollable nanoparticle sizes, etc., which significantly restricted their heat transfer performance. In this study, a novel nanofluid (designated as MP nanofluid) was fabricated via ultrasonic fragmentation of polyethylene glycol (PEG)-modified molybdenum disulfide (MoS₂) nanosheets, followed by surface modification mediated by polyvinylpyrrolidone (PVP). The resulting nanofluid demonstrated excellent dispersion stability and substantially improved flow boiling heat transfer performance. Specifically, the formulated nanofluids exhibited excellent stability at 80 °C for over 14 days and under ambient condition for 90 days without aggregation or sedimentation. More importantly, flow boiling experiments demonstrated that the MP nanofluid, at just 5 ppm and 0.13 m/s, boosts the critical heat flux (CHF) by 110 % and the heat transfer coefficient (HTC) by 114 % as compared to the basic fluid, significantly outperforming conventional nanofluids at higher concentrations. Further visualization studies revealed that the enhancement stems from reduced bubble size and a faster growth-to-collapse cycle, which in turn prevents the boiling crisis in electronic chips associated with large bubble coverage. Overall, this research provides novel insights into the application of MoS₂-based nanofluids in advanced thermal management systems, exhibiting their significant potential for electronic device cooling.

纳米流体技术在微通道流动沸腾传热系统中的应用是提高电子器件冷却效率的有效途径。然而，传统纳米流体普遍存在制备工艺复杂、稳定性不足、纳米颗粒尺寸不可控等问题，严重制约了其传热性能。本研究以聚乙二醇（PEG）修饰的二硫化钼（MoS2）纳米片为原料，采用超声波破碎法制备了一种新型纳米流体（MP纳米流体），然后用聚乙烯吡咯烷酮（PVP）介导其表面改性。所制备的纳米流体表现出优异的分散稳定性和显著改善的流动沸腾传热性能。具体来说，配方的纳米流体在80°C条件下表现出优异的稳定性超过14天，在环境条件下表现出90天的稳定性，没有聚集或沉淀。更重要的是，流动沸腾实验表明，与碱性流体相比，仅5 ppm和0.13 m/s的MP纳米流体将临界热流密度（CHF）提高了110%，传热系数（HTC）提高了114%，显著优于高浓度的常规纳米流体。进一步的可视化研究表明，这种增强源于气泡尺寸的减小和更快的生长到崩溃周期，这反过来又防止了与大气泡覆盖相关的电子芯片中的沸腾危机。总的来说，这项研究为基于mos2的纳米流体在先进热管理系统中的应用提供了新的见解，展示了它们在电子设备冷却方面的巨大潜力。

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引用次数: 0

Enhanced dual nature of ROS activity of ceria and its application for treating dental plaque 增强氧化铈活性氧活性的双重性质及其在牙菌斑治疗中的应用

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2026-01-13 DOI: 10.1016/j.mtnano.2026.100752

Yajing Bai , Yu Zhou , Zhipeng Hu , Qiwei Tang , Wangzi Liu , Mingxing Lu , Yue Huang , Hong Li

Plaque is a copolymer of bacteria under chronic inflammation, which requires dual treatment of both antibacterial and anti-inflammatory agents. In the study, we successfully developed a novel ceria nanoparticle with dual nature of reactive oxygen species (ROS) scavenging/generating capacity via photodynamic activity. Ceria was formed in a nano-confinement of mesoporous polydopamine (MPDA), along with a gold heterojunction. The ceria-gold@ MPDA nanoparticles (Ce-Au@MPDA NPs) in a size of 200 nm showed enhanced photodynamic capacity to produce ROS compared with MPDA and CeO₂ NPs alone, respectively, which showed antibacterial activity toward Escherichia coli, Staphylococcus aureus and Streptococcus mutans under NIR irradiation. Furthermore, under light irradiation, the Ce-Au@MPDA NPs demonstrated excellent performance in inhibiting and degrading biofilms. Also, an improved ROS scavenging effect was obtained when Ce-Au@MPDA was compared with either MPDA or CeO₂ NPs. The in vitro study showed that Ce-Au@MPDA effectively eliminated intracellular ROS. Due to the nanosize less than 20 nm of Ce-Au from the confinement of MPDA and the effective cycle from cerium (IV) to cerium (III) induced by the gold-ceria heterojunction according to XPS analysis, the dual nature of ceria was enhanced in its individual way. The study provides a novel way for dual therapeutic efficacy for treating dental plaque.

菌斑是慢性炎症下细菌的共聚物，需要抗菌和抗炎双重治疗。在这项研究中，我们成功地开发了一种新型的二氧化铈纳米粒子，它通过光动力活性具有清除和产生活性氧的双重性质。二氧化铈是在介孔聚多巴胺（MPDA）的纳米约束下形成的，并伴有金异质结。与单独制备的MPDA和CeO2 NPs相比，尺寸为200 nm的ceria-gold@ MPDA纳米粒子（Ce-Au@MPDA NPs）的光动力产ROS能力增强，在近红外照射下对大肠杆菌、金黄色葡萄球菌和变形链球菌具有抗菌活性。此外，在光照射下，Ce-Au@MPDA NPs表现出优异的抑制和降解生物膜的性能。此外，当Ce-Au@MPDA与MPDA或CeO2 NPs进行比较时，获得了更好的ROS清除效果。体外研究表明Ce-Au@MPDA能有效消除细胞内ROS。由于MPDA约束下Ce-Au的纳米尺寸小于20 nm， XPS分析表明，金-铈异质结诱导铈（IV）到铈（III）的有效循环，以其各自的方式增强了铈的双重性质。本研究为牙菌斑的双重治疗提供了一条新的途径。

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引用次数: 0

An electrostatic self-assembled Z-scheme heterojunction photocatalyst achieving breakthrough performance in organic pollutants decomposition and hydrogen production 静电自组装z型异质结光催化剂在有机污染物分解和制氢方面取得突破性进展

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2026-01-08 DOI: 10.1016/j.mtnano.2026.100757

Panpan Jing , Chaoyue Zhao , Peifeng Wang , Nan Guo

Enhancing the utilization-efficiency of photo-excited carriers via a heterojunction engineering remains a crucial challenge in developing effective and universal photocatalysts for wastewater purification and eco-friendly energy generation. In this work, we demonstrate a new visible-light-responsive Bi₄Ti₃O₁₂/AgBr heterojunction photocatalyst constructed by in-situ anchoring AgBr particles on molten-salt-synthesized Bi₄Ti₃O₁₂ nanosheets via an electrostatic self-assembly method. Due to the high separation efficiency, low transport resistance and longevity of photo-generated carriers adhered to a Z-scheme migration path under a junction-induced interfacial built-in electric field, the Bi₄Ti₃O₁₂/AgBr-1:1 heterojunction with an optimized component ratio and microstructure exhibits an exceptional visible-light-driven photocatalytic capability with degrading 95 % of Rhodamine B and 91 % of methyl orange in both only 7 min, and 81 % of tetracycline hydrochloride in solution in only 24 min, which dominated by the contributions of superoxide radical and photo-excited holes. Moreover, it delivers a high hydrogen-production rate of 112.4 μmol g⁻¹h⁻¹. This performance is several-fold improvement over the bare Bi₄Ti₃O₁₂ nanosheets, AgBr particles, and commercial P25 nano powders, ranking among the highest reported for Bi₄Ti₃O₁₂-based systems. Consequently, this work not only presents a high-efficiency dual-functional photocatalyst for both organic pollutant’s degradation and H₂-production, but also yields fundamental discoveries regarding the rational design of Z-scheme heterojunctions for advanced photocatalytic applications.

通过异质结工程提高光激发载体的利用效率仍然是开发有效和通用的光催化剂用于废水净化和生态友好型能源生产的关键挑战。在这项工作中，我们展示了一种新的可见光响应Bi4Ti3O12/AgBr异质结光催化剂，该催化剂是通过静电自组装方法将AgBr颗粒原位锚定在熔盐合成的Bi4Ti3O12纳米片上构建的。由于在结诱导的界面内置电场作用下，光生成的Z-scheme迁移路径上的载体分离效率高，传输阻力低，寿命长，具有优化组分比和微观结构的Bi4Ti3O12/AgBr-1:1异质结在7分钟内就能降解95%的罗丹明B和91%的甲基橙，表现出优异的可见光驱动光催化能力。盐酸四环素在24 min内溶解度达到81%，其中超氧自由基和光激发空穴的贡献占主导地位。同时，它的产氢速率高达112.4 μmol g−1h−1。这种性能比裸Bi4Ti3O12纳米片、AgBr颗粒和商用P25纳米粉末提高了几倍，是基于Bi4Ti3O12的系统中报道的最高性能之一。因此，这项工作不仅为有机污染物的降解和h2的产生提供了一种高效的双功能光催化剂，而且还为先进的光催化应用提供了合理设计z -图式异质结的基础发现。

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引用次数: 0

Solvent-assisted size effect and defect engineering synergistically prepare high-efficiency microwave absorbers 溶剂辅助尺寸效应与缺陷工程协同制备高效微波吸收剂

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2026-01-08 DOI: 10.1016/j.mtnano.2026.100753

Jia Su , Fushan Li , Lujie Zhang , Xuan Yang , Jiaomin Li , Hongya Wu , Xiaoyi Zhao , Shilu Wang , Zidong Zhang , Lixin Xuan

In order to address the high-performance needs for absorptive materials in modern electronic devices and to overcome technical barriers such as frequency bandwidth and impedance matching, a cooperative design strategy is proposed that combines solvent-assisted size effects with defect engineering. A series of nanoflower CuS samples was synthesized using a simple hydrothermal process, with the type of solvent being the only variable factor in the experimental design. The synergistic effect between solvent-induced micro-size regulation and copper vacancy engineering enhances impedance matching, stimulates conductive loss, and promotes defect polarization. The CuS-S-EG sample, which had been optimized, was dispersed in the paraffin matrix with a mass fraction of 30 %, thereby achieving an effective absorption band (EAB) of 6.93 GHz with a thickness of a mere 2.18 mm. Concurrently, an exceptional minimum reflection loss (RL_min) of −28.63 dB with a matching thickness of 2.41 mm was achieved. Radar cross-section (RCS) simulations further demonstrated the dissipation capability of CuS-S-EG electromagnetic wave (EMW) in real-world applications. This study proposes a novel methodology for the fabrication of high-performance CuS-based absorbers.

为了解决现代电子器件对吸波材料的高性能需求，克服频率带宽和阻抗匹配等技术障碍，提出了一种溶剂辅助尺寸效应与缺陷工程相结合的协同设计策略。采用简单的水热法合成了一系列纳米花CuS样品，溶剂类型是实验设计中唯一的可变因素。溶剂诱导的微尺寸调节与铜空位工程的协同作用增强了阻抗匹配，刺激了导电损失，促进了缺陷极化。优化后的cu - s - eg样品以30%的质量分数分散在石蜡基体中，有效吸收带（EAB）为6.93 GHz，厚度仅为2.18 mm。同时，在匹配厚度为2.41 mm的情况下，实现了−28.63 dB的最小反射损耗（RLmin）。雷达截面（RCS）仿真进一步证明了cu -s - eg电磁波（EMW）在实际应用中的耗散能力。本研究提出了一种制备高性能cu基吸收剂的新方法。

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引用次数: 0

Stable alkaline water electrolysis enabled by carbon-encapsulated MoNi-MoO2 heterointerfaces with accelerated hydrogen evolution kinetics 碳包封的MoNi-MoO2异质界面加速了析氢动力学，实现了稳定的碱水电解

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2026-01-06 DOI: 10.1016/j.mtnano.2026.100754

Fan Liu , Zeyi Zhang , Yang Tang , Qianwei Chen , Yangyang Tan , Tianou He , Shu-Juan Bao

Anion exchange membrane water electrolysis (AEMWE) powered by renewable energy sources offer an attractive strategy for green hydrogen production. However, developing efficient and durable electrocatalysts, especially under fluctuating power inputs, remains a key challenge. Herein, a strategy of altering the adsorption energy of intermediates through interface engineering is proposed to enhance alkaline Hydrogen evolution reaction (HER) activity. The constructed MoNi-MoO₂ heterointerfaces exhibit strong metal-support interactions, leading to significant charge redistribution, and optimization of the d-band center and hydrogen adsorption energy. Density functional theory (DFT) calculations further revealed that Ni site lower the energy barrier for the hydroxyl transfer process, thereby accelerating the overall HER kinetics. As a result, the MoNi-MoO₂-C/NF catalyst achieved superior HER catalytic performance, requiring a low overpotential of 39 mV to reach 10 mA cm⁻². Moreover, the assembled AEMWE achieved a high current density of 1 A cm⁻² with a low voltage of 1.79 V and maintains exceptional stability for over 220 h under dynamic operating conditions. This work provides valuable guidance for designing effective catalysts for green hydrogen production powered by fluctuating power supply sources.

以可再生能源为动力的阴离子交换膜电解（AEMWE）为绿色制氢提供了一种有吸引力的策略。然而，开发高效和耐用的电催化剂，特别是在波动功率输入下，仍然是一个关键的挑战。本文提出了一种通过界面工程改变中间体吸附能来提高碱性析氢反应（HER）活性的策略。所构建的MoNi-MoO2异质界面表现出强烈的金属-负载相互作用，导致明显的电荷再分配，并优化了d带中心和氢吸附能。密度泛函理论（DFT）计算进一步表明，Ni位点降低了羟基转移过程的能垒，从而加速了整体HER动力学。结果表明，MoNi-MoO2-C/NF催化剂具有优异的HER催化性能，需要39 mV的低过电位才能达到10 mA cm−2。此外，组装的AEMWE在1.79 V的低电压下实现了1 a cm−2的高电流密度，并在动态工作条件下保持了超过220小时的卓越稳定性。该研究为设计波动电源驱动的绿色制氢催化剂提供了有价值的指导。

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引用次数: 0

Leveraging the Mott-Schottky junction in Ru/TiO2 NRs/g-C3N4 ternary heterojunctions for enhanced photocatalytic efficiency 利用Ru/TiO2 NRs/g-C3N4三元异质结中的Mott-Schottky结提高光催化效率

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2026-01-06 DOI: 10.1016/j.mtnano.2026.100755

Tehmina Akhtar , Sharif Ullah , Syeda Aqsa Batool Bukhari , Johannes W. Schwank , Habib Nasir

The development of highly efficient and stable photocatalysts is paramount for addressing the global challenge of water pollution. This study reports the rational design and synthesis of a novel ruthenium-decorated TiO₂ nanorods/g-C₃N₄ (Ru/TiO₂ NRs/g-C₃N₄) 0D/1D/2D ternary heterojunction with exceptional photocatalytic activity. The material was extensively characterized using a suite of advanced techniques, including STEM, HRTEM, XRD, XPS, BET, PL, Raman, and UV–vis DRS spectroscopy, which confirmed the uniform deposition of Ru nanoparticles (1–3 nm) and strong interfacial interactions. The photocatalytic performance of the ternary heterojunction was evaluated for the degradation of rhodamine B (RhB) and the reduction of 4-nitrophenol (4-NP) under visible light (λ > 420 nm, 100 mW/cm²). The Ru/TiO₂ NRs/g-C₃N₄ catalyst exhibited remarkable efficiency, achieving 99.9 % degradation of RhB in 35 min (rate constant: 0.21 min⁻¹) and complete conversion of 4-NP to 4-aminophenol (4-AP) in just 6 min, significantly outperforming other noble metal-decorated systems. The enhanced activity is attributed to optimal Mott-Schottky junction formation, superior charge separation efficiency, and the synergistic effects of the 0D/1D/2D hierarchical architecture. The catalyst also demonstrated excellent stability and reusability over five consecutive cycles, highlighting its potential for practical application in industrial wastewater treatment and environmental remediation. This work establishes a new benchmark for the design of advanced photocatalytic systems and presents a promising pathway for developing sustainable solutions to water pollution.

开发高效稳定的光催化剂对于解决水污染的全球性挑战至关重要。本研究报道了一种具有优异光催化活性的钌修饰TiO2纳米棒/g-C3N4 (Ru/TiO2 NRs/g-C3N4) 0D/1D/2D三元异质结的合理设计和合成。使用STEM、HRTEM、XRD、XPS、BET、PL、Raman和UV-vis DRS等先进技术对材料进行了广泛的表征，证实了Ru纳米颗粒（1-3 nm）的均匀沉积和强界面相互作用。考察了三元异质结在可见光（λ > 420 nm, 100 mW/cm2）下降解罗丹明B （RhB）和还原4-硝基苯酚（4-NP）的光催化性能。Ru/TiO2 NRs/g-C3N4催化剂表现出了显著的效率，在35分钟内（速率常数为0.21 min−1）对RhB的降解率达到99.9%，在6分钟内将4-NP完全转化为4-氨基酚（4-AP），明显优于其他贵金属修饰的体系。活性的增强归因于最佳的Mott-Schottky结形成，优越的电荷分离效率以及0D/1D/2D分层结构的协同效应。该催化剂在连续五个循环中表现出优异的稳定性和可重复使用性，突出了其在工业废水处理和环境修复方面的实际应用潜力。这项工作为设计先进的光催化系统建立了新的基准，并为开发可持续的水污染解决方案提供了一条有希望的途径。

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引用次数: 0

Reconstruction-driven active site modulation in ZnxOx/Cu catalysts for CO2 hydrogenation ZnxOx/Cu催化剂CO2加氢活性位点的重构驱动调制

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-30 DOI: 10.1016/j.mtnano.2025.100749

Tengteng Yi , Peng Li , Yidi Wu , Lulu Chen , Sen Lin

The hydrogenation of carbon dioxide to methanol on reverse ZnO/Cu catalysts holds great promise for effectively mitigating greenhouse gas emissions while enabling sustainable synthesis of fuels and chemicals. However, the dynamic structural evolution of ZnO clusters under reaction conditions poses significant challenges for identifying and regulating active sites. This study systematically investigates the reconstruction of Zn_xO_x clusters (Zn₁O₁, Zn₃O₃, Zn₅O₅) supported on the Cu(111) crystal plane and its impact on CO₂ and H adsorption and HCOO formation. Ab initio molecular dynamics simulations reveal that the smaller Zn₁O₁/Cu system readily forms a CuZn alloy structure, while larger clusters (Zn₃O₃/Cu and Zn₅O₅/Cu) generate stable ZnO₃ unit with exposed O sites, forming Cu-ZnO₃ interfaces. On the reconstructed surfaces, the weakened adsorption of CO₂ and H promotes their effective coupling, thus lowering the barrier for HCOO formation. Microkinetic simulations further demonstrate that this reconstruction reshapes surface coverage of reactants and accelerates HCOO formation by 2-6 orders of magnitude, underscoring the crucial role of thermal-induced structural dynamics in governing catalytic performance. This work provides molecular-level insights into how dynamic reconstruction governs the CO₂ hydrogenation mechanism on oxide-metal interfaces.

在反向ZnO/Cu催化剂上将二氧化碳加氢成甲醇，在有效减少温室气体排放的同时，实现燃料和化学品的可持续合成，具有很大的前景。然而，反应条件下ZnO团簇的动态结构演变给活性位点的识别和调控带来了重大挑战。本研究系统地研究了Cu（111）晶面上负载ZnxOx簇（zn101, Zn3O3, Zn5O5）的重构及其对CO2和H吸附和HCOO生成的影响。从头算分子动力学模拟表明，较小的zn10o1 /Cu体系容易形成CuZn合金结构，而较大的Zn3O3/Cu和Zn5O5/Cu体系形成稳定的ZnO3单元，并暴露出O位，形成Cu-ZnO3界面。在重建的表面上，CO2和H的吸附减弱，促进了它们的有效耦合，从而降低了HCOO形成的屏障。微动力学模拟进一步表明，这种重构重塑了反应物的表面覆盖，加速了2-6个数量级的HCOO形成，强调了热诱导结构动力学在控制催化性能方面的关键作用。这项工作为动态重建如何控制氧化物-金属界面上的CO2加氢机制提供了分子水平的见解。

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引用次数: 0

Novel catalyst-free mucoadhesive polyester nanoparticles enabling enhanced dissolution and controlled release of methylprednisolone acetate 新型无催化剂粘粘聚酯纳米颗粒，增强醋酸甲基强的松龙的溶解和控制释放

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-29 DOI: 10.1016/j.mtnano.2025.100750

Keristina Wagdi K. Amin , Ágota Deák , Médi Sándor , Diána Szabó , László Rovó , László Janovák

Thiolated aliphatic polyesters have received considerable attention owing to their biodegradability, biocompatibility, and mucoadhesive properties. These attributes make them suitable for developing mucoadhesive drug delivery systems. However, polyester synthesis has traditionally required metallic or mineral acid catalysts, raising concerns about residual toxicity and purification challenges. To address these limitations, recent research has focused on catalyst-free synthesis of polyesters, thereby avoiding toxicity. This study introduces, for the first time, the catalyst-free synthesis of polyethylene thiomalate (PET) polyesters and the development of PET-based NPs, offering a novel mucoadhesive nanocarrier free from toxic catalyst residues and suitable for encapsulation of hydrophobic drugs such as methylprednisolone acetate (MPA). By adjusting polycondensation time, PET polyesters with relatively low molecular weights (

M_{W}

908–1652 Da) and moderate hydrophilicity (Θ = 38–75°) were synthesized, ensuring compatibility with aqueous environments and hydrophobic drugs. Given the limited literature on PET solubility and precipitation behaviour, a detailed investigation was conducted, enabling the development of an optimized MPA encapsulation technique within the synthesized PET particles. The MPA-loaded particles exhibited small sizes (198–275 nm), high ζ-potential (∼- 40 mV), and reduced drug crystallinity, contributing to improved aqueous dispersibility and stability compared to unencapsulated MPA. Furthermore, molecular weight tunability enabled both enhanced and sustained drug release. The NPs also exhibited strong mucoadhesive properties, expected to prolong residence time at the absorption site and facilitate higher drug flux through intimate mucosal contact, thereby supporting improved bioavailability. These findings establish catalyst-free PET NPs as safe and promising carriers for hydrophobic drugs such as MPA.

巯基脂肪族聚酯由于其生物可降解性、生物相容性和粘接性能而受到广泛关注。这些特性使它们适合于开发黏附给药系统。然而，聚酯合成传统上需要金属或无机酸催化剂，这引起了对残留毒性和净化挑战的担忧。为了解决这些限制，最近的研究集中在无催化剂合成聚酯，从而避免毒性。本研究首次介绍了聚乙烯硫氰酸酯（PET）聚酯的无催化剂合成和基于PET的NPs的开发，提供了一种新型的无毒性催化剂残留物的黏附纳米载体，适用于醋酸甲基强龙（MPA）等疏水药物的包封。通过调整缩聚时间，合成了分子量相对较低（MW 908-1652 Da）、亲水性适中（Θ = 38-75°）的PET聚酯，保证了与水环境和疏水药物的相容性。鉴于关于PET溶解度和沉淀行为的文献有限，我们进行了详细的研究，从而开发了一种优化的MPA包封技术。与未封装的MPA相比，负载MPA的颗粒具有小尺寸（198-275 nm），高ζ电位（~ - 40 mV）和降低药物结晶度的特点，有助于提高水分散性和稳定性。此外，分子量的可调性使药物释放增强和持续。NPs还表现出较强的黏附特性，有望延长在吸收部位的停留时间，并通过与粘膜的密切接触促进更高的药物通量，从而支持提高生物利用度。这些发现表明，无催化剂PET NPs是一种安全且有前景的疏水药物载体，如MPA。

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引用次数: 0

Multi-orientational sample preparation of 2D van der Waals materials by ultramicrotome for atomic resolution transmission electron microscopy 二维范德华材料多取向样品的原子分辨透射电镜超微组制备

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-29 DOI: 10.1016/j.mtnano.2025.100751

Yuwen Xu , Chia-En Huang , Richard F. Webster , Dawei Zhang , Joanna Biazik , Jan Seidel , Shery L.Y. Chang

Two-dimensional (2D) van der Waals materials exhibit unique functionalities that attract a great deal of interest. However, difficulties remain in preparing high-quality ultra-thin samples in various orientations for scanning/transmission electron microscopy (S/TEM) measurements owing to their anisotropic layered construction, soft mechanical nature, and sensitivity to ion damage. Here we use an ultramicrotome as an alternative S/TEM sample preparation method for multi-orientational investigation of 2D van der Waals materials. By adjusting ultramicrotomy conditions, we demonstrate its suitability on transition metal dichalcogenides (WTe₂) and demonstrate the high structural quality of both top-view and side view samples using aberration-corrected scanning transmission electron microscopy (STEM). Thickness measurements using low-loss electron energy loss spectroscopy (EELS) show an ideal thickness can be achieved by ultramicrotomy preparation. Our findings reveal the potential of ultramicrotome preparation for fundamental characterization of 2D van der Waals materials in multiple orientations that may support a wide range of applications.

二维（2D）范德华材料表现出独特的功能，吸引了大量的兴趣。然而，由于其各向异性层状结构、软力学性质和对离子损伤的敏感性，在制备用于扫描/透射电子显微镜（S/TEM）测量的各种取向的高质量超薄样品方面仍然存在困难。在这里，我们使用超微组作为替代的S/TEM样品制备方法，用于二维范德华材料的多向研究。通过调整超微切片条件，我们证明了其在过渡金属二硫族化合物（WTe2）上的适用性，并利用像差校正扫描透射电子显微镜（STEM）证明了俯视图和侧视图样品的高结构质量。厚度测量使用低损耗电子能量损失光谱（EELS）表明，理想的厚度可以实现超显微制备。我们的研究结果揭示了超微组制备在二维范德华材料多方向基本表征方面的潜力，这可能支持广泛的应用。

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引用次数: 0

In-situ encapsulated aggregation induced emission photosensitizer in electrospun nanofiber mats for light-triggered self-disinfection 电纺纳米纤维毡中原位封装聚集诱导发射光敏剂用于光触发自消毒

IF 8.2 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Nano

Pub Date : 2025-12-27 DOI: 10.1016/j.mtnano.2025.100745

Yanan Zhang , Yijia Wang , Yujie Gao , Yangxi Cheng , Danfeng Jian , Yifan Sun , Xiaotong He , Dan Yu , Jindan Wu

Personal protective equipment (PPE) can significantly reduce the negative impact of emerging infectious diseases caused by pathogenic bacteria on public health and the global economy. However, conventional PPE without self-disinfection properties cannot kill the attached microorganisms efficiently, and may cause cross-contamination and environmental damage. Herein, an efficient aggregation-induced emission photosensitizer (AIE PS), (E)-2-(3-cyano-5,5-dimethyl- 4-(4-(1,2,2-triphenylvinyl)-styryl)furan-2(5H)-ylidene)malononitrile (TPE-TCF), was in-situ packaged within hollow nanospheres of zeolitic imidazolate framework-8 (ZIF-8) by the assistance of sodium dodecyl sulfate (SDS), to prepare TPE-TCF/SDS@ZIF-8 nanoparticles (NPs). These NPs exhibited both high reactive oxygen species (ROS) production efficiency and good stability. Then, they were assembled onto a polyacrylonitrile/polyvinyl-pyrrolidone (PPP) electrospun nanofiber mats to form composite nanofiber mats TZ-PPP via a visible light-induced dopamine (DA)-assisted co-deposition method. The electrospun nanofiber mats serve as an efficient antibacterial nano-platform, providing more adsorption sites for the composite NPs, enabling the exposed composite NPs to interact with oxygen sufficiently, and maximizing their antibacterial efficacy substantially. Importantly, the TZ-PPP composite nanofiber mats retained the initial ultra-high ROS production efficiency and superior antibacterial performance of TPE-TCF/SDS@ZIF-8 NPs. Under the irradiation of low-power white light (400–830 nm, 50 mW cm⁻²), TZ-PPP nanofiber mats were able to remove more than 99.9% (10 min) and 99.0% (40 min) of bacteria and fungi, respectively, with significant photodynamic inactivation of microorganisms. This study is an exploration of the combination of AIE PS with nanofibers, whose outstanding photodynamic antibacterial properties provide new perspectives for the development of novel medical protective materials.

个人防护装备（PPE）可以显著减少由致病菌引起的新发传染病对公共卫生和全球经济的负面影响。然而，传统PPE不具备自消毒性能，不能有效杀灭附着的微生物，可能造成交叉污染和环境破坏。在十二烷基硫酸钠（SDS）的辅助下，将高效的聚集诱导发射光敏剂（AIE PS） (E)-2-（3-氰基-5,5-二甲基- 4-（4-（1,2,2-三苯基乙烯基）-苯乙烯基）呋喃-2(5H)-乙基）丙二腈（TPE-TCF）原位封装在沸石咪唑酸框架-8 （ZIF-8）中空纳米球中，制备了TPE-TCF/SDS@ZIF-8纳米颗粒（NPs）。这些NPs具有较高的活性氧（ROS）生成效率和良好的稳定性。然后，通过可见光诱导多巴胺（DA）辅助共沉积的方法，将它们组装在聚丙烯腈/聚乙烯吡咯烷酮（PPP）静电纺纳米纤维垫上，形成复合纳米纤维垫片TZ-PPP。静电纺纳米纤维垫作为一种高效的抗菌纳米平台，为复合NPs提供了更多的吸附位点，使暴露在外的复合NPs与氧充分相互作用，极大地提高了复合NPs的抗菌效果。重要的是，TZ-PPP复合纳米纤维垫保留了TPE-TCF/SDS@ZIF-8 NPs最初的超高ROS生成效率和优越的抗菌性能。在低功率白光（400-830 nm, 50 mW cm−2）照射下，TZ-PPP纳米纤维垫对细菌和真菌的去除率分别超过99.9% （10 min）和99.0% (40 min)，微生物的光动力失活效果显著。本研究是对AIE PS与纳米纤维结合的探索，其优异的光动力抗菌性能为新型医用防护材料的开发提供了新的视角。

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引用次数: 0