Journal of Materials Research最新文献

英文中文

In situ synthesis of silver nanoparticles as a facile strategy to prepare PCL scaffolds with antibacterial activity for a potential treatment for decubitus ulcers 原位合成银纳米粒子，作为制备具有抗菌活性的 PCL 支架的简便策略，有望治疗褥疮

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-06-17 DOI: 10.1557/s43578-024-01366-w

Ece Bayrak, Mehrdad Forough, Zeynep Tutumlu, Osman Eroğul

A single-step strategy was proposed for the in situ synthesis of silver nanoparticles (AgNps) to prepare polycaprolactone scaffolds with antibacterial activity for decubitus ulcers. AgNps were synthesized, by chemical reduction method, on the surface of electrospun polycaprolactone scaffolds that had been treated with argon plasma. Different AgNO₃:NaBH₄ molar ratios (1:1–1:6) and PVP concentrations (1–3–5–10%) were investigated. For further studies, AgNO₃:NaBH₄ molar ratio of 1:3 and a 3% PVP were selected, resulting AgNps with a diameter of 91.54 ± 7.62 nm. Silver release behavior of the scaffolds exhibited a burst release within the first 12 h, followed by a plateau within 2 weeks. The synthesized AgNps demonstrated a potent antibacterial effect against Escherichia coli and Staphylococcus aureus strains, reducing viability down to 15%. PCL scaffolds with AgNps showed increased inhibition zones, 13.33 ± 2.17 mm to 14.94 ± 2.37 mm for E. coli and 14.76 ± 0.24 mm to 16.24 ± 1.45 mm for S. aureus. As a result, this single-step approach can be used as an alternative antibacterial dressing for wound injuries.

Graphical abstract

本研究提出了一种原位合成银纳米粒子（AgNps）的单步策略，以制备具有抗菌活性的聚己内酯支架，用于治疗褥疮。通过化学还原法，在经过氩等离子处理的电纺聚己内酯支架表面合成了银纳米粒子。研究了不同的 AgNO3:NaBH4 摩尔比（1:1-1:6）和 PVP 浓度（1-3-5-10%）。为了进一步研究，我们选择了 1:3 的 AgNO3:NaBH4 摩尔比和 3% 的 PVP，结果发现 AgNps 的直径为 91.54 ± 7.62 nm。支架的银释放行为表现为在最初的 12 小时内迸发释放，随后在 2 周内趋于平稳。合成的 AgNps 对大肠杆菌和金黄色葡萄球菌菌株具有很强的抗菌效果，可将其存活率降至 15%。含有 AgNps 的 PCL 支架显示出更大的抑菌区，对大肠杆菌的抑菌区从 13.33 ± 2.17 mm 扩大到 14.94 ± 2.37 mm，对金黄色葡萄球菌的抑菌区从 14.76 ± 0.24 mm 扩大到 16.24 ± 1.45 mm。因此，这种单步方法可用作伤口抗菌敷料的替代品。

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引用次数: 0

Correction: Structural, magnetic, and photocatalytic properties of core–shell reversal nanocomposites of titanium-doped strontium ferrite and silica 更正：掺杂钛的锶铁氧体和二氧化硅核壳反转纳米复合材料的结构、磁性和光催化特性

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-05-29 DOI: 10.1557/s43578-024-01360-2

Jaspreet Kaur Grewal, Manpreet Kaur, Manpreet Kaur Ubhi, Aderbal C. Oliveira, Vijayendra Kumar Garg, Virender K. Sharma

引用次数: 0

Enhanced yield of methanol using rGO-Bi2S3/CuO heterojunction photocatalyst for CO2 reduction 利用 rGO-Bi2S3/CuO 异质结光催化剂还原二氧化碳，提高甲醇产量

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-05-14 DOI: 10.1557/s43578-024-01352-2

Arindam Mandal, Guruprasad Bhattacharya, Kajari Kargupta

A visible light-induced rGO-Bi₂S₃/CuO S-scheme heterojunction photocatalyst is explored for the production of methanol and formic acid through photocatalytic CO₂ reduction. In this work, the effect of CuO loading on rGO-Bi₂S₃ nano-hollow flower composite are investigated to improve the yield and selectivity of methanol production. The synthesised rGO-Bi₂S₃/CuO nanocomposite, being a highly efficient and robust photocatalyst, exhibits the maximum methanol yield of 423.52 μmol g_cat.⁻¹ h⁻¹ along with formic acid. CuO loading on rGO-Bi₂S₃ is responsible for achieving the maximum photocatalytic activity of the rGO-Bi₂S₃/CuO photocatalyst, the narrowest band gap, the lowest recombination rate of electron–hole pairs, and the increased specific surface area for CO₂ capture among all the related photocatalysts, rGO-Bi₂S₃, pristine Bi₂S₃, and Bi₂S₃/CuO nanocomposite. The selectivity of methanol is improved to 98.6% by the rGO-Bi₂S₃/CuO heterojunction photocatalyst. The absorption edge (652.4 nm) of the rGO-Bi₂S₃/CuO photocatalyst clearly exhibits outstanding visible light absorption and enhanced photo carrier transportation power.

Graphical Abstract

本研究探索了一种可见光诱导的 rGO-Bi2S3/CuO S 型异质结光催化剂，用于通过光催化二氧化碳还原生产甲醇和甲酸。在这项工作中，研究了 CuO 在 rGO-Bi2S3 纳米空心花复合材料上负载的影响，以提高甲醇生产的产率和选择性。合成的 rGO-Bi2S3/CuO 纳米复合材料是一种高效、坚固的光催化剂，它与甲酸的甲醇产率最高，达到 423.52 μmol gcat.-1 h-1。在 rGO-Bi2S3、原始 Bi2S3 和 Bi2S3/CuO 纳米复合材料等所有相关光催化剂中，rGO-Bi2S3/CuO 光催化剂的光催化活性最高，带隙最窄，电子-空穴对重组率最低，捕获二氧化碳的比表面积增大。rGO-Bi2S3/CuO 异质结光催化剂对甲醇的选择性提高到 98.6%。rGO-Bi2S3/CuO光催化剂的吸收边缘（652.4 nm）明显表现出对可见光的出色吸收和更强的光载流子传输能力。

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引用次数: 0

Correction: Insight into photocatalytic behavior of magnesium ferrite–bentonite nanocomposite for the degradation of organic contaminants 更正：深入了解镁铁氧体-膨润土纳米复合材料降解有机污染物的光催化行为

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-05-10 DOI: 10.1557/s43578-024-01354-0

Manpreet Kaur Ubhi, Manpreet Kaur, Jaspreet Kaur Grewal, Aderbal C. Oliveira, Vijayendra Kumar Garg, Virender K. Sharma

引用次数: 0

Short-range nanoregions and nanosized defects in LiFeO $$_2$$ compound deduced from Mössbauer spectroscopy and Rietveld analysis 从莫斯鲍尔光谱和里特维尔德分析法推导出 LiFeO $$_2$$ 复合物中的短程纳米区域和纳米级缺陷

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-05-06 DOI: 10.1557/s43578-024-01338-0

V. Panagopoulos, E. Devlin, Y. Sanakis, V. Psycharis, M. Pissas

We examined the crystal and magnetic properties of the polymorphic LiFeO(_2) compound using Mössbauer spectra (MS), X-ray diffraction data (XRD), and magnetic measurements. X-ray diffraction analysis of (alpha)-LiFeO(_2) and (beta ')-LiFeO(_2) phases reveals that short-range ordering observed in the (alpha)-LiFeO(_2) phase is potentially linked to the (beta ')-LiFeO(_2) phase nanoregions. Low-temperature MS of the (alpha)-LiFeO(_2) phase reveal a complicated disordered magnetic state below 90 K. Rietveld analysis of the XRD data of the (gamma)-LiFeO(_2) phase reveals a defect microstructure. These defects produce a complicated distribution of the hyperfine magnetic field estimated from MS. While it is not possible to produce the (beta ')-LiFeO(_2) phase in pure form, extended annealing of the (alpha)-LiFeO(_2) phase at 400 (^circ)C yields a nanocomposite material comprising nanoregions of both (beta ')-LiFeO(_2) and (gamma)-LiFeO(_2) phases.

Graphical abstract

我们使用莫斯鲍尔光谱（MS）、X 射线衍射数据（XRD）和磁性测量方法研究了多晶态 LiFeO(_2) 化合物的晶体和磁性。对（α）-LiFeO（_2）和（β）-LiFeO（_2）相的 X 射线衍射分析表明，在（α）-LiFeO（_2）相中观察到的短程有序化可能与（β）-LiFeO（_2）相纳米区域有关。对（α）-LiFeO（_2）相的 XRD 数据进行的里特维尔德分析揭示了一种有缺陷的微观结构。这些缺陷产生了由 MS 估算的超频磁场的复杂分布。虽然不可能生产出纯的（beta）-LiFeO（_2）相、α）-LiFeO（_2）相在400℃下的扩展退火产生了一种纳米复合材料，这种材料由（β）-LiFeO（_2）相和（gamma）-LiFeO（_2）相的纳米区域组成。图形摘要

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引用次数: 0

Influence of electrochemical hydrogen charging on the mechanical, diffusional, and interfacial properties of an amorphous alumina coating on Fe-8 wt% Cr alloy 电化学充氢对 Fe-8 wt% Cr 合金上无定形氧化铝涂层的机械、扩散和界面特性的影响

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-05-06 DOI: 10.1557/s43578-024-01348-y

Hariprasad Gopalan, Jing Rao, Piyush Patil, Chanwon Jung, Se-Ho Kim, Silas Goodrich, Marcel Wetegrove, Angela Kruth, Christina Scheu, Gerhard Dehm, Maria Jazmin Duarte

Amorphous alumina coatings, intended as hydrogen barriers, were successfully deposited on Fe-8 wt% Cr substrates by plasma ion-assisted deposition technique. The amorphous structure of the coatings was confirmed by transmission electron microscopy and X-ray diffraction. The interfacial and mechanical properties of the coating-substrate system were evaluated using an in-house custom-designed backside electrochemical hydrogen charging method. In this approach, the substrate side faces the electrolyte (hydrogen entry side) and the mechanical behavior was tested on the coating side (hydrogen exit side). A Kelvin-probe-based measurement was performed to determine the hydrogen diffusivity in these amorphous alumina coatings at room temperature using a similar backside charging approach. Chemical and microstructural characterizations, in combination with scratch and hardness testing, show that interfacial hydrogen accumulation is strongly responsible for drastic changes in the scratch morphology of the coating and its adhesion to the substrate. Scratch testing promises to be a quick and easy technique to fingerprint changes at the coating/substrate interface upon hydrogen exposure.

Graphical abstract

通过等离子体离子辅助沉积技术，成功地在含铁 8 wt% 的铬基底上沉积了用作氢屏障的非晶氧化铝涂层。透射电子显微镜和 X 射线衍射证实了涂层的非晶结构。利用内部定制的背面电化学氢充电方法，对涂层-基底系统的界面和机械性能进行了评估。在这种方法中，基底面朝向电解质（氢进入面），而机械性能则在涂层面（氢排出面）进行测试。采用类似的背面充氢方法，进行了基于开尔文探针的测量，以确定室温下这些非晶氧化铝涂层中的氢扩散率。结合划痕和硬度测试进行的化学和微观结构表征表明，界面氢积累是涂层划痕形态及其与基体附着力发生剧烈变化的主要原因。划痕测试有望成为一种快速、简便的技术，用于确定氢暴露时涂层/基底界面的变化。

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引用次数: 0

Influence of modified halloysite nanotube on the properties of poly(ether ether ketone) 改性哈洛石纳米管对聚（醚醚酮）性能的影响

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-05-02 DOI: 10.1557/s43578-024-01351-3

Naved Siraj, S. A. R. Hashmi, Sarika Verma

This study focuses on the modification of halloysite nanotubes (diameter 30–70 nm and length 1–3 µ) using concentrated sulphuric acid to create modified HNTs (mHNTs) and investigates their impact on the properties of PEEK material. Co-rotating twin screw extrusion is employed to incorporate various loadings of mHNTs into the PEEK matrix. The experimental results demonstrate a significant increase in hardness, impact strength, elongation at break, tensile and flexural strengths, and tensile modulus with increasing mHNT concentration. The mHNTs function as bridging tools and reinforcing agents within the polar-nonpolar hybrid system, facilitating compatibility between the blend partners. The composites exhibit improved dynamic thermal and mechanical properties compared to the pure PEEK. The composite materials are further characterized using techniques such as TGA, FESEM, DSC, DMA and FTIR. The enhanced effects observed in the developed composites are attributed to improved interfacial adhesion and favorable interactions between the PEEK matrix and the mHNTs.

Graphical abstract

本研究的重点是使用浓硫酸对哈洛来石纳米管（直径 30-70 nm，长度 1-3 µ）进行改性，从而产生改性 HNTs（mHNTs），并研究其对 PEEK 材料性能的影响。采用同向旋转双螺杆挤压法将不同负载量的 mHNTs 加入 PEEK 基体中。实验结果表明，随着 mHNT 浓度的增加，硬度、冲击强度、断裂伸长率、拉伸和弯曲强度以及拉伸模量都有显著提高。mHNT 在极性-非极性混合体系中起到桥接工具和增强剂的作用，促进了混合伙伴之间的兼容性。与纯 PEEK 相比，复合材料具有更好的动态热性能和机械性能。使用 TGA、FESEM、DSC、DMA 和 FTIR 等技术对复合材料进行了进一步表征。在所开发的复合材料中观察到的增强效果归因于 PEEK 基体与 mHNTs 之间界面粘附性的改善和有利的相互作用。

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引用次数: 0

Evaluating the effect of cryopreservation, cell migration and perfused media on degradation of porous scaffold 评估低温保存、细胞迁移和灌注介质对多孔支架降解的影响

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-04-30 DOI: 10.1557/s43578-024-01346-0

Khemraj Deshmukh, Arindam Bit

The degradation of scaffolds is a critical aspect in tissue engineering and regenerative medicine. Various factors that influence the degradation of scaffold are viscosity, density, hydrophilicity, temperature, cells and degradation environment. In present study, the degradation of scaffold were evaluated in presence of perfused media, Red blood cells (RBC), and cryogenic conditions. Different properties such as density, viscosity and contact angle of bio-ink used for fabrication of scaffold were also evaluated and their correlation to desired environment conditions were also evaluated. A poly electrolyte complex scaffolds (chitosan: alginate, chitosan: gelatine), and explicit scaffolds were considered for degradation study. Explicit scaffold and PEC scaffolds were fabricated form chitosan, alginate and gelatine at mixing ratio of 20:80, 50:50, and 80:20 concentration by solvent casting and etching method. The scaffold degradation studies in perfused media were performed at flow rate of 0.5 ml/min, 1 ml/min and 2 ml/min. The parameters related to degradation of scaffold such as weight and pH of discharge media were also evaluated. Results indicated that degradation of chitosan: alginate at 20:80 concentration had shown maximum degradation in presence of RBCs. Similarly, degradation pattern was equal to linear patten for all the scaffolds except 20:80 and 50:50 concentration of chitosan-alginate in cryogenic conditions. Result of scaffolds degradation in perfused media had shown that scaffolds were degraded maximal at a flow rate of 1 ml/min as compare to other flow rates. Contact angle measurement had proved that all PEC scaffold belongs to the category of hydrophilic family. The scaffold fabricated from higher concentration of chitosan had revealed slower degradation as compare to others configuration. The acceleration of scaffold degradation was tiggered by enzymatic and cellular activities in the presence of RBCs. Perfused media had caused scaffold degradation due to presence of mechanical shear stress.

Graphical abstract

在组织工程和再生医学中，支架降解是一个关键问题。影响支架降解的因素包括粘度、密度、亲水性、温度、细胞和降解环境。本研究评估了支架在灌注介质、红细胞（RBC）和低温条件下的降解情况。此外，还评估了用于制造支架的生物墨水的密度、粘度和接触角等不同特性，以及它们与所需环境条件的相关性。降解研究考虑了聚电解质复合支架（壳聚糖：海藻酸盐、壳聚糖：明胶）和显性支架。通过溶剂浇铸和蚀刻方法，以 20:80、50:50 和 80:20 的混合比例将壳聚糖、海藻酸盐和明胶制成显性支架和 PEC 支架。在流速分别为 0.5 ml/min、1 ml/min 和 2 ml/min 的灌注介质中进行了支架降解研究。此外，还评估了与支架降解相关的参数，如排水介质的重量和 pH 值。结果表明，浓度为 20:80 的壳聚糖：海藻酸盐在有 RBC 存在时降解量最大。同样，在低温条件下，除 20:80 和 50:50 浓度的壳聚糖-海藻酸盐外，其他所有支架的降解模式均为线性模式。支架在灌注介质中的降解结果表明，与其他流速相比，支架在流速为 1 毫升/分钟时降解速度最快。接触角测量证明，所有 PEC 支架都属于亲水性材料。与其他配置相比，用较高浓度壳聚糖制作的支架降解速度较慢。在有红细胞存在的情况下，酶和细胞活动会加速支架降解。灌注介质由于存在机械剪切应力而导致支架降解。

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引用次数: 0

Nanoarchitectonics of catalytic tubular nanomotors based on Cu/Fe@SBA-15 for lung cancer treatment 基于 Cu/Fe@SBA-15 的用于肺癌治疗的催化管状纳米马达的纳米结构学

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-04-30 DOI: 10.1557/s43578-024-01342-4

Mohamed S. El-Okaily, Ahmed M. A. El-Seidy, Eman H. Ismail, Rasha M. Allam, Ayman A. Saeed, Asim Bhaumik, Amany A. Mostafa

Fabrications of nanomotors (NMs) are at the forefront of exploring the true potential of nanotechnology. Tubular nanomotors (TNMs) have been attracting huge interest recently. NMs based on 2D-hexagonal mesoporous silica (SBA-15) have been prepared through the surfactant-assisted sol–gel method. Copper and/or iron oxide nanoparticles have been impregnated in SBA-15 to form catalytic tubular nanomotors. Characterization has been investigated by XPS, XRD, HR-TEM, SEM–EDS, and BET. The electrochemical measurements were used to confirm the motion of the nanomotors. By increasing the loading of metal oxide nanoparticles, the motion decreases; this could be observed from the current loss. The anti-cancer potential of synthesized nanomotors against two cell lines (A549 and H460) of human lung carcinoma has been tested. Among all tested NMs, high-metal oxide-loaded materials containing CuO only as well as CuO and Fe₂O₃ are potent and significant in apoptotic cell death for lung cancer treatment.

Graphical abstract

纳米马达（NMs）的制造是探索纳米技术真正潜力的最前沿。管状纳米马达（TNMs）最近引起了人们的极大兴趣。通过表面活性剂辅助溶胶-凝胶法制备了基于二维六方介孔二氧化硅（SBA-15）的纳米马达。铜和/或氧化铁纳米颗粒被浸渍在 SBA-15 中，形成催化管状纳米马达。通过 XPS、XRD、HR-TEM、SEM-EDS 和 BET 对其特性进行了研究。电化学测量用于确认纳米马达的运动。随着金属氧化物纳米粒子负载量的增加，运动会减弱；这可以从电流损失中观察到。测试了合成的纳米电机对两种人类肺癌细胞系（A549 和 H460）的抗癌潜力。在所有测试的纳米粒子中，仅含有 CuO 以及 CuO 和 Fe2O3 的高金属氧化物负载材料对肺癌治疗具有显著的细胞凋亡作用。

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引用次数: 0

Microstructural, mechanical, room, and high temperature tribological properties of graphene oxide reinforced plasma sprayed alumina nanocomposite coatings 氧化石墨烯增强等离子喷涂氧化铝纳米复合涂层的微结构、机械、室温和高温摩擦学特性

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research

Pub Date : 2024-04-29 DOI: 10.1557/s43578-024-01347-z

Suraj Prasad, S. Sharma, Chintham Satish, Pushpender Singh, Satish Indupuri, P. Sai Kiran, Niranjan Pandit, Shailesh Mani Pandey, Anup Kumar Keshri

High-temperature tribological performance novel coatings are much in demand, which requires improving the wear performance of prevalent and widespread ceramic coatings used presently. Hence, graphene oxide (GO) reinforced alumina coatings (0.5–2 wt %) were deposited on steel substrates via atmospheric plasma spraying (APS), enhancing wear performance for high-temperature applications. With 1.5 wt% GO, coating density increased from 88.5 to 94.61%, elevating hardness and elastic modulus by ~ 47.5% and ~ 62.9%, respectively. Tribological analysis at room temperature and elevated temperatures (473 K, 673 K, 873 K) demonstrated a significant reduction in friction coefficient and wear rate compared to monolithic alumina coatings. The enhanced wear resistance is attributed to the tribo-chemical layer formation and increased hardness, suggesting potential for the development of high-temperature operating coatings. This coating is thought to have the potential to open the door to the development of high-temperature operating coatings.

Graphical abstract

高温摩擦学性能的新型涂层需求量很大，这就需要改善目前普遍使用的陶瓷涂层的磨损性能。因此，通过大气等离子喷涂（APS）在钢基材上沉积了氧化石墨烯（GO）增强氧化铝涂层（0.5-2 wt %），从而提高了高温应用的磨损性能。1.5 wt% 的 GO 使涂层密度从 88.5% 增加到 94.61%，硬度和弹性模量分别提高了 ~ 47.5% 和 ~ 62.9%。室温和高温（473 K、673 K、873 K）下的摩擦学分析表明，与整体氧化铝涂层相比，摩擦系数和磨损率显著降低。耐磨性的增强归功于三重化学层的形成和硬度的提高，这表明该涂层具有开发高温操作涂层的潜力。这种涂层被认为有可能为高温操作涂层的开发打开一扇大门。

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引用次数: 0

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