Nano Materials Science最新文献_第10页

Current strategic development of single-atom electrocatalyst in sensor construction: A mini-review 单原子电催化剂在传感器构建中的战略发展现状：微型综述

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-12-01 Epub Date: 2024-07-27 DOI: 10.1016/j.nanoms.2024.06.007

Mohanraj Jagannathan , Sungbo Cho

With the development of advanced catalysts, the assessment of emerging single-atom-based electrochemical catalysts (SAECs) has significantly increased owing to their similarity to natural enzymes. They hold substantial potential for the design and construction of electrochemical sensing platforms. The fabrication of single-atom-based electrodes revealed their potential for sensitive and selective analyses. Among various nanomaterials, transition metal element-based single-atom, bimetallic single-atom, and metal-free single-atom, each with well-defined active sites, exhibit enhanced catalytic activity, selectivity, and stability. The rational construction of the composition, size, and the strategic development of single-atom electrocatalysts on carbon platforms to enable them to function effectively in complex environments and demonstrate their efficiency between the active sites and electrode construction strategies. Unlike traditional catalysts, SAECs are considered to potential substitutes for natural enzymes. This perspective has been described in a mini-review that highlights recent developments in transition metal elements-based single/bimetallic single atoms and metal-free single atoms anchored on carbon nanostructures. Additionally, there has been a rise in the fabrication of printed electrodes as sensing platforms for biomedical, environmental, and food toxin detection. The challenges and prospects for SAECs in multiple sensing applications are also concisely elaborated.

随着先进催化剂的发展，新兴的单原子电化学催化剂（SAECs）因其与天然酶的相似性而受到越来越多的重视。它们在电化学传感平台的设计和构建方面具有巨大的潜力。单原子电极的制造显示了它们在敏感和选择性分析方面的潜力。在各种纳米材料中，基于过渡金属元素的单原子、双金属单原子和不含金属的单原子都具有明确的活性位点，表现出增强的催化活性、选择性和稳定性。合理构建碳平台单原子电催化剂的组成、尺寸和策略发展，使其能够在复杂环境中有效发挥作用，并在活性位点和电极构建策略之间展示其效率。与传统催化剂不同，saec被认为是天然酶的潜在替代品。这一观点已经在一篇小型综述中进行了描述，重点介绍了基于过渡金属元素的单/双金属单原子和锚定在碳纳米结构上的无金属单原子的最新进展。此外，作为生物医学、环境和食物毒素检测的传感平台，印刷电极的制造也有所增加。简要阐述了saec在多种传感应用中的挑战和前景。

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引用次数: 0

Nanoscale air channel devices- inheritance and breakthrough of vacuum tube 纳米级空气通道装置--真空管的继承与突破

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-12-01 Epub Date: 2024-02-19 DOI: 10.1016/j.nanoms.2024.01.002

Baihong Chen , Linjie Fan , Jinshun Bi , Zhiqiang Li , Ziming Xu , Sandip Majumdar

The nanoscale air channel device (NACD) has recently gained significant attention as a novel vacuum electronic that can be fabricated through nanofabrication technologies. Here, the research and progress of the NACD since it was reviewed, with a focus on working mechanism analysis, nanofabrication technologies, device structure optimization, electrode materials and simulation approach. Furthermore, the application fields and future development of NACD were summarized and prospected. The NACDs are expected to surpass the physical limits of traditional solid transistors due to its advantages such as smaller heat loss, high-speed, resistance to harsh environments.

纳米级空气通道器件（NACD）作为一种新型的真空电子器件，可以通过纳米制造技术制造，近年来引起了人们的广泛关注。本文综述了NACD自诞生以来的研究进展，重点从工作机理分析、纳米加工技术、器件结构优化、电极材料和模拟方法等方面进行了综述。并对NACD的应用领域和未来发展进行了总结和展望。nnacd具有热损耗小、速度快、耐恶劣环境等优点，有望超越传统固体晶体管的物理极限。

引用次数: 0

Structure transformation induced bi-component Co–Mo/A-Co(OH)2 as highly efficient hydrogen evolution catalyst in alkaline media 结构转变诱导的双组分 Co-Mo/A-Co(OH)2 作为碱性介质中的高效氢进化催化剂

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-01-06 DOI: 10.1016/j.nanoms.2023.11.006

Yingqing Ou , Lu Liu , Xiao Peng , Lili Zhang , Zhongwen Ou , Wendong Zhang , Yunhuai Zhang

Elucidating the inherent origins of the sluggish hydrogen evolution reaction (HER) kinetics in alkaline media and developing high-performance electrocatalysts are fundamental for the advances of conventional alkaline water electrolyzers and emerging anion exchange membrane (AEM) electrolyzers. Here we present a facile electrochemical modification strategy for the synthesis of bi-component Co–Mo_(18%)/A-Co(OH)₂ catalyst toward efficient HER catalysis in alkaline media. Porous Co–Mo alloys with adjustable Mo/Co atomic ratio are first prepared by H₂-assisted cathodic electrodeposition. By virtue of the appropriate electronic structure and hydrogen binding energy, Co–Mo_(18%) is the most HER active among the alloys and is further activated by a constant-current electrochemical modification process. Physical characterizations reveal the formation of amorphous Co(OH)₂ nanoparticles on the surface. Electrokinetic analysis combined with theoretical calculations reveal that the in-situ formed Co(OH)₂ can efficiently promote the water dissociation, resulting in accelerated Volmer-step kinetics. As a result, the Co–Mo_(18%)/A-Co(OH)₂ simultaneously achieves the optimization of the two factors dominating alkaline HER activity, i.e., water dissociation and hydrogen adsorption/desorption via the bifunctional synergy of the bi-components. The high HER activity (η₁₀ of 47 mV at 10 mA cm⁻²) of Co–Mo_(18%)/A-Co(OH)₂ is close to benchmark Pt/C catalyst and comparable or superior to the most active non-noble metal catalysts.

阐明碱性介质中氢气进化反应（HER）动力学迟缓的内在原因并开发高性能电催化剂是传统碱性水电解槽和新兴阴离子交换膜（AEM）电解槽发展的基础。在此，我们提出了一种简便的电化学改性策略，用于合成双组分 Co-Mo(18%)/A-Co(OH)2催化剂，以在碱性介质中实现高效 HER 催化。首先通过 H2- 辅助阴极电沉积制备出具有可调 Mo/Co 原子比的多孔 Co-Mo 合金。凭借适当的电子结构和氢结合能，Co-Mo(18%) 是合金中最具 HER 活性的一种，并通过恒流电化学改性过程进一步激活。物理特性分析表明，表面形成了无定形的 Co(OH)2 纳米颗粒。电动力学分析和理论计算显示，原位形成的 Co(OH)2 能有效促进水的解离，从而加速 Volmer 步动力学。因此，Co-Mo(18%)/A-Co(OH)2 通过双组分的双功能协同作用，同时优化了主导碱性 HER 活性的两个因素，即水解离和氢吸附/解吸。Co-Mo(18%)/A-Co(OH)2 的高氢氧还原活性（η10 为 47 mV，10 mA cm-2）接近基准 Pt/C 催化剂，可与活性最高的非贵金属催化剂媲美或更胜一筹。

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引用次数: 0

Low-frequency and dual-band microwave absorption properties of novel VB-group disulphides (3R–TaS2) nanosheets 新型 VB 族二硫化物 (3R-TaS2) 纳米片的低频和双波段微波吸收特性

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-05-31 DOI: 10.1016/j.nanoms.2024.05.011

Liquan Fan , Honglin Ai , Meiye Jiao , Yao Li , Yongheng Jin , Yiru Fu , Jing Wang , Yuwei Wang , Deqing Zhang , Guangping Zheng , Junye Cheng

As electromagnetic technology advances and demand for electronic devices grows, concerns about electromagnetic pollution intensify. This has spurred focused research on innovative electromagnetic absorbers, particularly chalcogenides, noted for their superior absorption capabilities. In this study, we successfully synthesize 3R–TaS₂ nanosheets using a straightforward calcination method for the first time. These nanosheets exhibit significant absorption capabilities in both the C-band (4–8 GHz) and Ku-band (12–18 GHz) frequency ranges. By optimizing the calcination process, the complex permittivity of TaS₂ is enhanced, specifically for those synthesized at 1000 °C for 24 h. The nanosheets possess dual-band absorption properties, with a notable minimum reflection loss (RL_min) of −41.4 dB in the C-band, and an average absorption intensity exceeding 10 dB in C- and Ku-bands, in the absorbers with a thickness of 5.6 mm. Additionally, the 3R–TaS₂ nanosheets are demonstrated to have an effective absorption bandwidth of 5.04 GHz (3.84–8.88 GHz) in the absorbers with thicknesses of 3.5–5.5 mm. The results highlight the multiple reflection effects in 3R–TaS₂ as caused by their stacked structures, which could be promising low-frequency absorbers.

随着电磁技术的发展和对电子设备需求的增长，人们对电磁污染的担忧日益加剧。这激发了对创新型电磁吸收剂的重点研究，尤其是以其卓越的吸收能力而著称的铬化砷化物。在本研究中，我们首次采用直接煅烧法成功合成了 3R-TaS2 纳米片。这些纳米片在 C 波段（4-8 GHz）和 Ku 波段（12-18 GHz）频率范围内均表现出显著的吸收能力。通过优化煅烧过程，TaS2 的复介电常数得到了提高，尤其是在 1000 °C 下合成 24 小时的纳米片。这种纳米片具有双波段吸收特性，在 C 波段的最小反射损耗（RLmin）为 -41.4 dB，而在 C 波段和 Ku 波段，厚度为 5.6 mm 的吸收体的平均吸收强度超过 10 dB。此外，在厚度为 3.5-5.5 毫米的吸收器中，3R-TaS2 纳米片的有效吸收带宽为 5.04 GHz（3.84-8.88 GHz）。这些结果凸显了 3R-TaS2 的叠层结构所产生的多重反射效应，有望成为一种低频吸收器。

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引用次数: 0

MXene multi-functionalization of polyrotaxane based PCMs and the applications in electronic devices thermal management 基于聚二十六烷的 PCM 的 MXene 多功能化及其在电子设备热管理中的应用

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-01-27 DOI: 10.1016/j.nanoms.2023.12.004

Guangzhong Yin , Alba Marta López , Ignacio Collado , Antonio Vázquez-López , Xiang Ao , Jose Hobson , Silvia G. Prolongo , Deyi Wang

The aim of this work was to improve the thermal conductivity and electromagnetic shielding of the leakage proof phase change materials (PCMs), in which a polyrotaxane (PLR) was used as a support material to encapsulate PEG 1k or PEG 6k and MXene as multi-functional filler. The PCMs can be processed conveniently by a hot press and the PEG 1k containing samples showed excellent flexibility. We conducted a systematic evaluation of the phase transition behavior of the material, thermal conductivity and electromagnetic shielding performance tests. Notably, the PCMs achieved a high enthalpy values (123.9–159.6 J/g). The PCMs exhibited an increase of 44.3 %, and 137.5 % in thermal conductivity values with higher MXene content (5 wt%) for PLR-PEG6k and PLR-PEG1k, respectively, and show high shape stability and no leakage during and after phase transition. The introduction of MXene can significantly improve the electromagnetic shielding performance of PCM composites. Typically, higher conductive samples (samples which contain high MXene contents) offer a higher EMI SE shielding, reaching a maximum of 4.67 dB at 5.6 GHz for PLR-1K-MX5. These improvements solve the main problems of organic PEG based PCMs, thus making PLR-PEG-MXene based PCMs good candidates for thermoregulators of both solid-state disks and smart phone. It is worth pointing out that the sample PLR-1k-MX5 can decrease 4.3 °C of the reference temperature during cellphone running. Moreover, the temperature of the protecting sheet in the simulated solid state disk with PCM was significantly lower (showing a decreasing of 7.9 °C) compared with the blank sample.

这项研究的目的是提高防漏相变材料（PCMs）的导热性和电磁屏蔽性，其中使用了聚洛他赛（PLR）作为支撑材料，包裹 PEG 1k 或 PEG 6k，并使用 MXene 作为多功能填料。这种 PCM 可方便地通过热压工艺进行加工，含有 PEG 1k 的样品显示出极佳的柔韧性。我们对材料的相变行为、热导率和电磁屏蔽性能测试进行了系统评估。值得注意的是，PCM 达到了很高的焓值（123.9-159.6 J/g）。PLR-PEG6k 和 PLR-PEG1k 的 MXene 含量越高（5 wt%），PCM 的热导率值分别增加了 44.3% 和 137.5%，并且在相变过程中和相变后显示出较高的形状稳定性和无泄漏性。引入 MXene 可显著提高 PCM 复合材料的电磁屏蔽性能。通常情况下，导电性较高的样品（MXene 含量较高的样品）具有更高的电磁干扰屏蔽性能，PLR-1K-MX5 在 5.6 GHz 时的电磁干扰屏蔽性能最高可达 4.67 dB。这些改进解决了基于有机 PEG 的 PCM 的主要问题，从而使基于 PLR-PEG-MXene 的 PCM 成为固态磁盘和智能手机温度调节器的理想候选材料。值得注意的是，样品 PLR-1k-MX5 在手机运行过程中可将参考温度降低 4.3 °C。此外，与空白样品相比，含有 PCM 的模拟固态盘中保护片的温度明显降低（降低了 7.9 °C）。

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引用次数: 0

Revisiting the mitigation of coke formation: Synergism between support & promoters' role toward robust yield in the CO2 reformation of methane 重新审视焦炭形成的缓解问题：在甲烷的二氧化碳转化过程中，支持和促进剂对提高产量的协同作用

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-01-05 DOI: 10.1016/j.nanoms.2023.10.005

Zahra Taherian , Vahid Shahed Gharahshiran , Xiaoxuan Wei , Alireza Khataee , Yeojoon Yoon , Yasin Orooji

CO₂ reformation of methane (CRM) and CO₂ methanation are two interconnected processes with significant implications for greenhouse gas reduction and sustainable energy production for industrial purposes. While Ni-based catalysis suffers from poor stability due to coke formation or sintering, we report a super stable remedy. The active sites of mesoporous MgO were loaded using wet impregnation. The incorporation of Ni and promoters altered the physical features of the catalysts. Sm–Ni/MgO showed the smallest crystallite size, specific surface area, and pore volume. The Sm–Ni/MgO catalyst was selected as the most suitable candidate for CRM, with 82 % CH₄ and H₂/CO ratio of approximately 100 % and also for CO₂ methanation with the conversion of carbon dioxide (82 %) and the selectivity toward methane reaches 100 % at temperatures above 300 ^ᵒC. Furthermore, the Sm–Ni/MgO catalyst was stable for 900 min of continuous reaction, without significant carbon deposition. This stability was largely due to the high oxygen mobility on the catalyst surface in the presence of Sm. Overall, we demonstrated the efficacy of using promoted Ni catalysts supported by mesoporous magnesia for the improved reformation of greenhouse gases.

甲烷的二氧化碳重整（CRM）和二氧化碳甲烷化是两个相互关联的过程，对减少温室气体排放和工业用可持续能源生产具有重要意义。镍基催化剂因形成焦炭或烧结而稳定性差，而我们报告了一种超稳定的补救方法。介孔氧化镁的活性位点是通过湿法浸渍负载的。镍和促进剂的加入改变了催化剂的物理特性。Sm-Ni/MgO 的结晶尺寸、比表面积和孔体积最小。Sm-Ni/MgO催化剂被选为 CRM 的最合适候选催化剂，其 CH4 转化率为 82%，H2/CO 比率约为 100%，还可用于 CO2 甲烷化，二氧化碳转化率为 82%，在温度高于 300 ᵒC时，对甲烷的选择性达到 100%。此外，Sm-Ni/MgO 催化剂在连续反应 900 分钟后保持稳定，没有明显的碳沉积。这种稳定性主要归功于催化剂表面在 Sm 存在下的高氧流动性。总之，我们证明了使用介孔镁支撑的促进镍催化剂在改善温室气体转化方面的功效。

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引用次数: 0

Progress in doping and crystal deformation for polyanions cathode based lithium-ion batteries 聚阴离子正极锂离子电池的掺杂和晶体变形研究进展

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-02-12 DOI: 10.1016/j.nanoms.2024.01.004

Sajeela Awasthi , Srikanta Moharana , Vaneet Kumar , Nannan Wang , Elham Chmanehpour , Anupam Deep Sharma , Santosh K. Tiwari , Vijay Kumar , Yogendra Kumar Mishra

Polyanion-based materials are considered one of the most attractive and promising cathode materials for lithium-ion batteries (LIBs) due to their good stability, safety, cost-effectiveness, suitable voltages, and minimal environmental impact. However, these materials suffer from poor rate capability and low-temperature performance owing to limited electronic and ionic conductivity, which restricts their practical applicability. Recent developments, such as coating material particles with carbon or a conductive polymer, crystal deformation through the doping of foreign metal ions, and the production of nanostructured materials, have significantly enhanced the electrochemical performances of these materials. The successful applications of polyanion-based materials, especially in lithium-ion batteries, have been extensively reported. This comprehensive review discusses the current progress in crystal deformation in polyanion-based cathode materials, including phosphates, fluorophosphates, pyrophosphates, borates, silicates, sulfates, fluorosilicates, and oxalates. Therefore, this review provides detailed discussions on their synthesis strategies, electrochemical performance, and the doping of various ions.

聚阴离子基材料具有良好的稳定性、安全性、成本效益、合适的电压和最小的环境影响，因此被认为是最具吸引力和前景的锂离子电池（LIB）正极材料之一。然而，由于电子和离子导电性有限，这些材料的速率能力和低温性能较差，限制了它们的实际应用。最近的发展，如在材料颗粒上涂覆碳或导电聚合物、通过掺杂外来金属离子实现晶体变形，以及生产纳米结构材料等，大大提高了这些材料的电化学性能。聚阴离子基材料的成功应用，尤其是在锂离子电池中的应用，已被广泛报道。本综述全面讨论了目前在聚阴离子基正极材料晶体变形方面取得的进展，包括磷酸盐、氟磷酸盐、焦磷酸盐、硼酸盐、硅酸盐、硫酸盐、氟硅酸盐和草酸盐。因此，本综述将详细讨论它们的合成策略、电化学性能以及各种离子的掺杂。

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引用次数: 0

Chemical incorporation of SiO2 into TiO2 layer by green plasma enhancer and quencher agents for synchronized improvements in the protective and bioactive properties 通过绿色等离子体增强剂和淬灭剂将 SiO2 化学掺入 TiO2 层，同步提高保护和生物活性性能

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-01-11 DOI: 10.1016/j.nanoms.2024.01.003

Mosab Kaseem , Ananda Repycha Safira , Mohammad Aadil , Han-Choel Choe

This study explores the dynamic interaction between environmentally sustainable plasma enhancer and quencher agents during the incorporation of SiO₂ into a TiO₂ layer, with the primary objective of simultaneously augmenting protective and bioactive attributes. This enhancement is realized through the synergistic utilization of Tetraethyl orthosilicate (TE) and Stevia (ST) within a plasma-assisted oxidation process. To achieve this goal, Ti–6Al–4V alloy underwent oxidation in an electrolyte solution containing acetate-glycerophosphate, with the addition of TE and ST separately and in combination. TE, as a silicon oxide (SiO₂) precursor, facilitates the creation of a calcium-rich, rough, porous layer by undergoing hydrolysis to generate silanol groups (Si–OH), which subsequently condense into silicon-oxygen-silicon (Si–O–Si) bonds, resulting in SiO₂ formation. In contrast, ST acts as a plasma quencher, absorbing highly reactive plasma species during the oxidation process, reducing energy levels, and diminishing sparking intensity. The combination of TE and ST results in moderate sparking, balancing Stevia's quenching effect and TE's sparking influence. As a result, this coating exhibits enhanced corrosion resistance and bioactivity compared to using either ST or TE alone. The study highlights the potential of this synergistic approach for advanced TiO₂-based coatings.

本研究探讨了在二氧化硅加入二氧化钛层的过程中，环境可持续的等离子体增强剂和淬灭剂之间的动态相互作用，其主要目的是同时增强保护性和生物活性。通过在等离子辅助氧化过程中协同使用正硅酸四乙酯（TE）和甜叶菊（ST），实现了这种增强效果。为了实现这一目标，Ti-6Al-4V 合金在含有醋酸盐-甘油磷酸酯的电解质溶液中进行氧化，并分别和同时加入 TE 和 ST。TE 作为一种氧化硅 (SiO2) 前体，通过水解生成硅醇基团 (Si-OH)，进而凝结成硅-氧-硅键 (Si-O-Si)，形成 SiO2，从而促进富钙粗糙多孔层的形成。与此相反，ST 可作为等离子体淬火剂，在氧化过程中吸收高活性等离子体物质，降低能量水平，减弱火花强度。TE 和 ST 的组合可产生适度的火花，平衡了甜菊糖的淬火作用和 TE 的火花影响。因此，与单独使用 ST 或 TE 相比，这种涂层具有更强的耐腐蚀性和生物活性。这项研究强调了这种协同方法在基于二氧化钛的先进涂层方面的潜力。

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引用次数: 0

Synthesis of reduced graphene oxide nanosheets from sugarcane dry leaves by two-stage pyrolysis for antibacterial activity 通过两级热解从甘蔗干叶中合成具有抗菌活性的还原氧化石墨烯纳米片

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-01-28 DOI: 10.1016/j.nanoms.2024.01.006

Baskar Thangaraj , Pravin Raj Solomon , Nutthapon Wongyao , Mohamed I. Helal , Ali Abdullah , Sufian Abedrabbo , Jamal Hassan

Oxidative-exfoliation methods were in vogue in the production of rGO from graphite. Processing of such synthetic graphite needs high temperatures (≥2500 °C). Thus, such process is not cost-effective. The present study is made on the dry leaves of sugarcane (Saccharum officinarum) as an alternative raw material so as to be economical and environmentally benign. The dry leaves are subjected to two-step pyrolysis without any catalyst or reducing agent in far divergent temperatures to produce as prepared and acid treated rGOs. They were evaluated by UV–Vis., FTIR, XRD, Raman spectroscopy, TGA/DTG, BET, FESEM-EDS and TEM. The as prepared rGO has few layers with irregular and folded architecture whereas acid-treated rGO has thinly stacked crumpled sheets with many wrinkles on its surface. The prepared rGOs have multilayered graphitic structure due to the unique ratio between G and D bands. Acid treated rGO has poor thermal stability as compared to that of as-prepared rGO at high temperatures due to the variation in the oxygen-containing functional groups. Acid treated rGO has low antibacterial activity as compared to that of the as-prepared rGO due to the paucity of the functional groups.

氧化-剥离法是从石墨中生产 rGO 的流行方法。这种合成石墨的加工需要高温（≥2500 ℃）。因此，这种工艺不符合成本效益。本研究采用甘蔗（Saccharum officinarum）的干叶作为替代原料，以实现经济性和环保性。在不同温度下，不使用任何催化剂或还原剂，对干叶进行两步热解，制备出经酸处理的 rGOs。对它们进行了紫外可见光、傅立叶变换红外光谱、XRD、拉曼光谱、TGA/DTG、BET、FESEM-EDS 和 TEM 评估。制备的 rGO 只有几层，具有不规则的折叠结构，而经过酸处理的 rGO 则是薄薄地堆叠在一起，表面有许多皱褶。制备的 rGO 具有多层石墨结构，这得益于 G 带和 D 带之间独特的比率。由于含氧官能团的变化，与制备的 rGO 相比，酸处理的 rGO 在高温下的热稳定性较差。与制备的 rGO 相比，酸处理 rGO 的抗菌活性较低，原因是功能基团较少。

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引用次数: 0

Nickel-based superalloy architectures with surface mechanical attrition treatment: Compressive properties and collapse behaviour 经表面机械研磨处理的镍基超级合金结构：抗压性能和塌陷行为

IF 9.9 2区材料科学 Q1 Engineering

Nano Materials Science

Pub Date : 2024-10-01 Epub Date: 2024-01-05 DOI: 10.1016/j.nanoms.2023.11.008

Lizi Cheng , Xiaofeng Zhang , Jiacheng Xu , Temitope Olumide Olugbade , Gan Li , Dongdong Dong , Fucong Lyu , Haojie Kong , Mengke Huo , Jian Lu

Surface modifications can introduce natural gradients or structural hierarchy into human-made microlattices, making them simultaneously strong and tough. Herein, we describe our investigations of the mechanical properties and the underlying mechanisms of additively manufactured nickel–chromium superalloy (IN625) microlattices after surface mechanical attrition treatment (SMAT). Our results demonstrated that SMAT increased the yielding strength of these microlattices by more than 64.71% and also triggered a transition in their mechanical behaviour. Two primary failure modes were distinguished: weak global deformation, and layer-by-layer collapse, with the latter enhanced by SMAT. The significantly improved mechanical performance was attributable to the ultrafine and hard graded-nanograin layer induced by SMAT, which effectively leveraged the material and structural effects. These results were further validated by finite element analysis. This work provides insight into collapse behaviour and should facilitate the design of ultralight yet buckling-resistant cellular materials.

表面改性可以在人造微晶格中引入自然梯度或结构层次，使其同时具有强度和韧性。在此，我们介绍了我们对添加制造的镍铬超级合金（IN625）微晶格经过表面机械损耗处理（SMAT）后的机械性能和内在机理的研究。我们的研究结果表明，SMAT 使这些微晶格的屈服强度提高了 64.71% 以上，并引发了其机械性能的转变。我们发现了两种主要的失效模式：微弱的整体变形和逐层塌陷，后者在 SMAT 的作用下得到了增强。机械性能的明显改善归功于 SMAT 诱导的超细和坚硬的分级纳米晶粒层，它有效地利用了材料和结构效应。有限元分析进一步验证了这些结果。这项研究深入揭示了塌陷行为，有助于设计超轻且抗弯曲的蜂窝材料。

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引用次数: 0