Journal of Materials Research最新文献

英文中文

Atomic force microscopic investigations of transient early-stage bacterial adhesion and antibacterial activity of silver and ceria modified bioactive glass 银和铈修饰生物活性玻璃瞬时早期细菌粘附和抗菌活性的原子力显微镜研究

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

Journal of Materials Research

Pub Date : 2024-07-31 DOI: 10.1557/s43578-024-01391-9

Shivani Gour, Abhijit Mukherjee, Kantesh Balani, Navdeep K. Dhami

Bioactive glass 58S (BG58S) is widely recognised for its bioactivity and antibacterial properties, making it a promising material for orthopaedic implant applications. This study investigates the effects of incorporating silver (BG58S-2.5Ag) and cerium oxide (BG58S-5C) into BG58S on early-stage bacterial adhesion and subsequent bacterial growth inhibition. Using a high-intensity ball milling approach, BG58S was modified with 5% cerium oxide (CeO₂) and 2.5% silver (Ag) nanoparticles to create homogeneous BG58S-2.5Ag and BG58S-5C nanocomposites. Custom-made biomineral probes were employed to measure the bacterial adhesion within one second of contact with Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus, using Atomic Force Microscopy (AFM). The results demonstrated that BG58S-2.5Ag showed significantly stronger transient adhesion to bacteria compared to BG58S, leading to a more effective long-term antibacterial response. Additionally, it was observed that the antibacterial effect of Ag commenced within one second of contact. These findings indicate a potential correlation between the rate of bond strengthening and cell wall penetration. This study highlights the potential for enhancing the effectiveness of antibacterial implant surfaces for various biomaterial applications.

Graphical abstract

生物活性玻璃 58S (BG58S) 因其生物活性和抗菌特性而广受认可，是一种很有前景的骨科植入材料。本研究探讨了在 BG58S 中加入银（BG58S-2.5Ag）和氧化铈（BG58S-5C）对早期细菌粘附和随后细菌生长抑制的影响。采用高强度球磨方法，用 5%的氧化铈（CeO2）和 2.5% 的银（Ag）纳米粒子对 BG58S 进行改性，以生成均匀的 BG58S-2.5Ag 和 BG58S-5C 纳米复合材料。利用原子力显微镜（AFM）测量了定制生物矿物探针与革兰氏阴性大肠杆菌和革兰氏阳性金黄色葡萄球菌接触一秒钟内的细菌粘附力。结果表明，与 BG58S 相比，BG58S-2.5Ag 对细菌的瞬时粘附力明显更强，从而产生了更有效的长期抗菌反应。此外，还观察到 Ag 的抗菌作用在接触后一秒钟内就开始了。这些研究结果表明，粘合力的增强速度与细胞壁的穿透力之间存在潜在的相关性。这项研究强调了在各种生物材料应用中提高抗菌植入物表面有效性的潜力。

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引用次数: 0

A biologically multifunctional PDA-LYS composite coating is fabricated on the surface of magnesium alloy vascular stents to promote endothelialization 在镁合金血管支架表面制作生物多功能 PDA-LYS 复合涂层以促进内皮化

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

Journal of Materials Research

Pub Date : 2024-07-31 DOI: 10.1557/s43578-024-01386-6

Yi Ma, Hao-Jie Guo, Jing-An Li, Yan-Chao Wang, Yi-Fan Zhou

Due to their excellent mechanical properties and biodegradability, biodegradable magnesium alloy vascular stents have become a hot topic in current research on vascular stent material. However, the further application of magnesium alloy is limited by its rapid degradation rate and insufficient ability to promote surface endothelialization. This study proposed a strategy of co-depositing a PDA-LYS coating on the surface of magnesium alloy treated with an alkaline pre-heating process. Experimental results demonstrated that the PDA-LYS composite coating significantly improved the corrosion resistance of the magnesium alloy. Furthermore, with the increase in LYS content in the samples, the coating facilitated the adhesion and proliferation of endothelial cells and effectively inhibited the excessive proliferation of pathological smooth muscle cells. In summary, the PDA-LYS composite coating had a positive impact on the biocompatibility of magnesium alloy, which has offered a new approach for surface modification of magnesium alloy vascular materials.

Graphical abstract

可生物降解镁合金血管支架具有优异的机械性能和生物降解性，已成为当前血管支架材料研究的热点。然而，由于镁合金降解速度快，促进表面内皮化的能力不足，其进一步应用受到了限制。本研究提出了在经碱性预热工艺处理的镁合金表面共沉积 PDA-LYS 涂层的策略。实验结果表明，PDA-LYS 复合涂层显著提高了镁合金的耐腐蚀性。此外，随着样品中 LYS 含量的增加，涂层促进了内皮细胞的粘附和增殖，并有效抑制了病理性平滑肌细胞的过度增殖。总之，PDA-LYS 复合涂层对镁合金的生物相容性产生了积极影响，为镁合金血管材料的表面改性提供了一种新方法。

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引用次数: 0

Five-for-five: Highlights from five recent noteworthy papers on ionogels 五选五：离子凝胶方面近期五篇值得关注的论文集锦

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

Journal of Materials Research

Pub Date : 2024-07-31 DOI: 10.1557/s43578-024-01397-3

Meixiang Wang, Michael D. Dickey

This perspective—which arose from the “Distinguished Invited Speaker” series at the Materials Research Society Spring 2024 meeting—highlights five recent papers about ionogels. The title “Five-for-Five” refers to the dedication of a figure for each of the five papers. Ionogels are crosslinked polymer networks swollen with ionic liquids. Ionic liquids are interesting because they have ionic conductivity, negligible vapor pressure, high thermal and electrochemical stability. There are also many different ionic liquids to chose from. Thus, as we highlight here, it is possible to vary the concentration and composition of ionogels to make materials that are: (1) hydrophobic, (2) highly adhesive, (3) tough, (4) glassy, or (5) 3D printable. We hope this article will clearly illustrate several unique and tunable properties that are possible with ionogels while inspiring future research and applications of these remarkable materials.

Graphical abstract

本视角源于材料研究学会 2024 年春季会议的 "特邀演讲人 "系列，重点介绍五篇有关离子凝胶的最新论文。标题 "Five-for-Five "指的是这五篇论文中的每一篇都有一幅图。离子凝胶是用离子液体溶胀的交联聚合物网络。离子液体之所以有趣，是因为它们具有离子导电性、可忽略不计的蒸汽压、高热稳定性和电化学稳定性。此外，还有许多不同的离子液体可供选择。因此，正如我们在此强调的那样，可以通过改变离子凝胶的浓度和成分来制造具有以下特性的材料：(1) 疏水性、(2) 高粘性、(3) 韧性、(4) 玻璃状或 (5) 可 3D 打印。我们希望这篇文章能清楚地说明离子凝胶可能具有的几种独特的可调特性，同时激发未来对这些非凡材料的研究和应用。

引用次数: 0

Investigating the structural, electrical, and magnetic characteristics of Nd-doped BiFeO3 synthesized via the solid-state reaction method 研究固态反应法合成的掺钕 BiFeO3 的结构、电学和磁学特性

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

Journal of Materials Research

Pub Date : 2024-07-26 DOI: 10.1557/s43578-024-01394-6

Monika Lohchab, Sunil Rohilla, S. K. Chaudhary, Jyoti Saini

In present work polycrystalline Bi_1−xNd_xFeO₃ (X = 0.05 to 0.20 at step of 0.05) is synthesized by solid-state reaction method. Present study focuses on effect of temperature, frequency and concentration of Neodymium on BiFeO₃ structural, dielectric, magnetic and ferroelectric properties. Crystalline nature of samples confirmed by XRD. Rietveld refinement of XRD data for Bi_1−xNd_xFeO₃ shows structural transition for X = 0.20. Dielectric study shows very high value of dielectric constant i.e. (10⁵) and shows improvement in values of dielectric constant with increasing Nd amount and observed very low value (less than 20) for dielectric loss for all the samples. Magnetic study shows low value for Retentivity and maximum for X = 0.15 (0.0386emu/gm). Performed ferroelectric analysis shows that P_r has declining nature with increasing Nd concentration for all frequencies and minimum value of P_r is obtained for X = 0.15. All the properties like dielectric, magnetic and ferroelectric shows a transition in regular trend for X = 0.20.

Graphical Abstract

本研究采用固态反应法合成了多晶 Bi1-xNdxFeO3（X = 0.05 至 0.20，步长为 0.05）。本研究的重点是温度、频率和钕浓度对 BiFeO3 结构、介电、磁性和铁电特性的影响。样品的结晶性质由 XRD 证实。对 Bi1-xNdxFeO3 的 XRD 数据进行的里特维尔德细化显示了 X = 0.20 时的结构转变。介电研究显示介电常数的值非常高，即 105，而且随着钕含量的增加，介电常数的值也有所提高。磁性研究显示，保持率值较低，X = 0.15 时达到最大值（0.0386emu/gm）。铁电分析表明，在所有频率下，随着钕浓度的增加，Pr 值呈下降趋势，X = 0.15 时 Pr 值最小。X = 0.20 时，介电、磁性和铁电等所有特性都呈现出规律的过渡趋势。

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引用次数: 0

Development of empirical models for estimation polymer indentation fatigue and validation with finite element simulation models 开发用于估算聚合物压痕疲劳的经验模型，并用有限元模拟模型进行验证

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

Journal of Materials Research

Pub Date : 2024-07-25 DOI: 10.1557/s43578-024-01399-1

Soumya Ranjan Guru, Mihir Sarangi

Multi-cycle micro-indentation tests were conducted on three polymers: Poly-ether-ether-ketone (PEEK), Poly (methyl methacrylate) (PMMA), and Poly (tetra-fluoroethylene) (PTFE). The load–displacement curve obtained from the indentation technique was used to evaluate the mechanical properties of these polymers. This study employed multi-cyclic indentation to establish a polymer fatigue model utilizing the indentation load–displacement curve. Currently, researchers are investigating fatigue life studies using stress- and energy-based approaches. Two empirical models for each approach were developed using the least-square curve-fitting method in this study. A simulation model based on finite element analysis has been utilized to verify the accuracy of these fatigue models for Vickers indentation. During the validation process, both models had a maximum error value of 2% compared to the experimental data, indicating a strong agreement with the simulation results. The generated models can evaluate polymer fatigue using non-destructive methodology.

Graphical abstract

对三种聚合物进行了多循环微压痕测试：聚醚醚酮（PEEK）、聚甲基丙烯酸甲酯（PMMA）和聚四氟乙烯（PTFE）。通过压痕技术获得的载荷-位移曲线可用于评估这些聚合物的机械性能。这项研究采用多循环压痕法，利用压痕载荷-位移曲线建立了聚合物疲劳模型。目前，研究人员正在使用基于应力和能量的方法进行疲劳寿命研究。本研究采用最小平方曲线拟合法为每种方法建立了两个经验模型。基于有限元分析的模拟模型被用来验证这些维氏压痕疲劳模型的准确性。在验证过程中，与实验数据相比，两个模型的最大误差值均为 2%，表明与模拟结果非常吻合。生成的模型可以使用非破坏性方法评估聚合物疲劳。

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引用次数: 0

Fluorescent cobalt ferrite nanoparticles for non-destructive magnetic particle testing 用于无损磁粉检测的荧光钴铁氧体纳米粒子

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

Journal of Materials Research

Pub Date : 2024-07-22 DOI: 10.1557/s43578-024-01396-4

Z. Baharlouei, M. H. Enayati, S. M. Nahvi

Magnetic particle testing is one of the popular methods to detect very small surface or near-surface defects in engineering parts. Successful defect detection depends on the physical properties of the particles. This work aims to synthesize cobalt ferrite-fluorescent polymer particles to detect finer defects located in deeper places. For this purpose, cobalt ferrite (CoFe₂O₄) nanoparticles were synthesized and the next step, fluorescence pigment was incorporated into CoFe₂O₄ nanoparticles. X-ray diffraction (XRD), scanning electron microscopy (SEM), vibration magnetometer (VSM), and Fourier transform infrared spectroscope (FTIR) were used to examine the effects of various parameters. CoFe₂O₄ nanoparticles with a size of about 55 nm and suitable magnetic properties were chosen. The presence of pigment reduced the saturation magnetization to 25.17 emu/g, although this value is still within the suitable range. Finally, the stability of the pigment on CoFe₂O₄ nanoparticles in water was investigated, and synthesized nanocomposite was successfully used to reveal defects.

Graphical abstract

磁粉检测是检测工程零件中极小表面或近表面缺陷的常用方法之一。成功的缺陷检测取决于颗粒的物理特性。这项工作旨在合成钴铁氧体-荧光聚合物粒子，以检测位于更深处的更细小缺陷。为此，首先合成了钴铁氧体（CoFe2O4）纳米粒子，然后在 CoFe2O4 纳米粒子中加入了荧光颜料。使用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、振动磁力计（VSM）和傅立叶变换红外光谱（FTIR）来研究各种参数的影响。选择的 CoFe2O4 纳米粒子大小约为 55 nm，具有合适的磁性。颜料的存在使饱和磁化率降至 25.17 emu/g，尽管该值仍在合适的范围内。最后，研究了 CoFe2O4 纳米粒子上的颜料在水中的稳定性，并成功地利用合成的纳米复合材料揭示了缺陷。

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引用次数: 0

Emergence of multi-peak emission in CsBr-Cs4PbBr6-CsPbBr3 nanocrystals at room temperature 室温下 CsBr-Cs4PbBr6-CsPbBr3 纳米晶体中出现的多峰发射

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

Journal of Materials Research

Pub Date : 2024-07-22 DOI: 10.1557/s43578-024-01372-y

Chandrima Goswami, Asha Bhardwaj

Highly stable and bright emitting CsBr-Cs₄PbBr₆-CsPbBr₃ perovskite nanocrystals were synthesized using chemical route. For nanocrystals formed at higher Cs:Pb (10:1) ratios, multiple peak emission was observed in the UV–visible region (325–550 nm), while at lower Cs:Pb ratios (5:1 to 2.5:1), narrow high-intensity peak (at 522 nm, the signature peak of CsPbBr₃) along with a diminished broad multi-peak emission (325–500 nm) is observed. Blue-emitting nanocrystals were observed at higher Cs:Pb precursor (Pb deficient conditions) ratios. As concentration of Pb increases (Cs:Pb ratio decreases), contribution from broad emission decreases while green emitting 522 nm peak dominates. This broad emission is unique at room temperature for CsBr-Cs₄PbBr₆-CsPbBr₃ mixture of nanocrystals, unlike the single peak narrow emission reported in literature so far for inorganic lead halide perovskites. It is worth mentioning that the CsBr-Cs₄PbBr₆-CsPbBr₃ mixture of nanocrystals is highly stable and hence can be used for various optoelectronic applications.

Graphical abstract

利用化学方法合成了高稳定性和高亮度发射的铯硼-铯4硼-硼6-铯硼-硼3包晶纳米晶体。在较高的铯:铅比例（10:1）下形成的纳米晶体，在紫外可见光区域（325-550 nm）观察到多峰发射，而在较低的铯:铅比例（5:1 至 2.5:1）下，观察到窄的高强度峰（522 nm 处，CsPbBr3 的特征峰）以及减弱的宽多峰发射（325-500 nm）。在 Cs:Pb 前驱体（缺铅条件）比率较高时，可观察到蓝色发射纳米晶体。随着 Pb 浓度的增加（Cs:Pb 比值降低），宽发射的贡献减小，而 522 nm 的绿色发射峰占主导地位。这种宽发射是 CsBr-Cs4PbBr6-CsPbBr3 纳米晶体混合物在室温下的独特现象，与迄今为止文献中报道的无机卤化铅包晶石的单峰窄发射不同。值得一提的是，CsBr-Cs4PbBr6-CsPbBr3 纳米晶体混合物非常稳定，因此可用于各种光电应用。

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引用次数: 0

Effect of temperature and strain rate on the hot workability behaviour of Ni–25Cr–14W superalloy: An approach using processing map and constitutive equation 温度和应变率对 Ni-25Cr-14W 超合金热加工性能的影响：使用加工图和构成方程的方法

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

Journal of Materials Research

Pub Date : 2024-07-22 DOI: 10.1557/s43578-024-01390-w

Ravi Ranjan Kumar, Randhir Kumar Singh, Varsha Florist, Namit Pai, C. R. Anoop, Debasis Tripathy, S. V. S. Narayana Murty

The hot workability of Ni–25Cr–14W alloy is studied through isothermal hot compression tests in the temperature (T) range of 1000–1200 °C and in the strain rates(ε̇) of 0.001–10 s⁻¹ in a thermomechanical simulator. Flow stress data show stable flow curves at T > 1050 °C and ε̇ < 0.1 s⁻¹. The values of flow stress decrease with increase in T or decrease in ε̇. Based on processing map, safe region for hot workability has been identified in the temperature range of 1000–1200 °C and ε̇ of 0.001–0.1 s⁻¹ with maximum efficiency(η) of ~ 44% at 1175 °C and 0.001 s⁻¹. Dynamic recrystallization has been identified as the softening mechanism operating in the material at high temperature and lower ε̇. Incomplete recrystallization of the microstructures was noted during multi-step forging by varying T or ε̇, indicating the importance of maintaining the same during industrial processing.

Graphical abstract

在热机械模拟器中，通过温度（T）范围为 1000-1200 °C、应变率（ε态）为 0.001-10 s-1 的等温热压缩试验研究了 Ni-25Cr-14W 合金的热加工性能。流动应力数据显示，在温度为 1050 °C 和应变速率为 0.1 s-1 时，流动应力曲线比较稳定。流动应力值随着温度的升高或ε̇ 的减小而减小。根据加工图，确定了热加工的安全区温度范围为 1000-1200 ℃，ε̇ 为 0.001-0.1 s-1，在 1175 ℃ 和 0.001 s-1 时最大效率（η）约为 44%。动态再结晶已被确定为高温和较低ε̇ 时材料的软化机制。在改变温度或ε̇ 的多步锻造过程中，发现微观结构未完全再结晶，这表明在工业加工过程中保持相同温度和ε̇ 的重要性。

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引用次数: 0

Diamond/graphene (carbon sp3-sp2) heterojunctions for neuromorphic device applications 用于神经形态器件应用的金刚石/石墨烯（碳 sp3-sp2）异质结

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

Journal of Materials Research

Pub Date : 2024-07-17 DOI: 10.1557/s43578-024-01395-5

H. Iwane, G. Saito, S. Muto, K. Ueda

Diamond/graphene (carbon sp³-sp²) interfaces exhibit various interesting and potentially useful electronic phenomena. The present work demonstrates the possibility of obtaining novel neuromorphic photodevices using such junctions. Junctions were found to show different photoconductivity relaxation behavior depending on their growth conditions such that various optoelectronic properties were observed. In particular, interfaces exhibiting shorter relaxation times could be used to construct image recognition devices mimicking short-term memory functions of the human brain. Using these devices, images of the hand-written numerals 0 through 9 could be optoelectronically recognized with an accuracy on the order of 80%, demonstrating both photo-detection and processing functions in a single device. These results suggest that novel image processing devices could be produced using graphene/diamond heterojunctions.

Graphical Abstract

金刚石/石墨烯（碳 sp3-sp2）界面呈现出各种有趣且潜在有用的电子现象。本研究成果证明了利用此类结点获得新型神经形态光电器件的可能性。研究发现，结的光电导弛豫行为因其生长条件的不同而不同，从而观察到各种光电特性。特别是，表现出较短弛豫时间的界面可用于构建模仿人脑短期记忆功能的图像识别设备。利用这些装置，可以对手写数字 0 到 9 的图像进行光电识别，准确率达到 80% 左右，从而在单个装置中实现了光电检测和处理功能。这些结果表明，利用石墨烯/金刚石异质结可以生产出新型图像处理设备。

引用次数: 0

Biocompatibility of pure iron for biodegradable stents: Effects on human coronary aorta endothelial cells 用于生物可降解支架的纯铁的生物相容性：对人类冠状动脉内皮细胞的影响

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

Journal of Materials Research

Pub Date : 2024-07-16 DOI: 10.1557/s43578-024-01393-7

J. Merlo, Silvia Marcela Ceré

引用次数: 0

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