Nano Materials Science最新文献

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

Nano Materials Science Pub Date : 2024-10-01 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

{"title":"MXene multi-functionalization of polyrotaxane based PCMs and the applications in electronic devices thermal management","authors":"Guangzhong Yin , Alba Marta López , Ignacio Collado , Antonio Vázquez-López , Xiang Ao , Jose Hobson , Silvia G. Prolongo , Deyi Wang","doi":"10.1016/j.nanoms.2023.12.004","DOIUrl":"10.1016/j.nanoms.2023.12.004","url":null,"abstract":"<div><div>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 (<span>PLR</span>) 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.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 495-503"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139585930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Nano Materials Science Pub Date : 2024-10-01 DOI: 10.1016/j.nanoms.2023.11.006

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

{"title":"Structure transformation induced bi-component Co–Mo/A-Co(OH)2 as highly efficient hydrogen evolution catalyst in alkaline media","authors":"Yingqing Ou , Lu Liu , Xiao Peng , Lili Zhang , Zhongwen Ou , Wendong Zhang , Yunhuai Zhang","doi":"10.1016/j.nanoms.2023.11.006","DOIUrl":"10.1016/j.nanoms.2023.11.006","url":null,"abstract":"<div><div>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<sub>(18%)</sub>/A-Co(OH)<sub>2</sub> catalyst toward efficient HER catalysis in alkaline media. Porous Co–Mo alloys with adjustable Mo/Co atomic ratio are first prepared by H<sub>2</sub>-assisted cathodic electrodeposition. By virtue of the appropriate electronic structure and hydrogen binding energy, Co–Mo<sub>(18%)</sub> 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)<sub>2</sub> nanoparticles on the surface. Electrokinetic analysis combined with theoretical calculations reveal that the in-situ formed Co(OH)<sub>2</sub> can efficiently promote the water dissociation, resulting in accelerated Volmer-step kinetics. As a result, the Co–Mo<sub>(18%)</sub>/A-Co(OH)<sub>2</sub> 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 (<em>η</em><sub>10</sub> of 47 mV at 10 mA cm<sup>−2</sup>) of Co–Mo<sub>(18%)</sub>/A-Co(OH)<sub>2</sub> is close to benchmark Pt/C catalyst and comparable or superior to the most active non-noble metal catalysts.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 565-575"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139393631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Nano Materials Science Pub Date : 2024-10-01 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

{"title":"Low-frequency and dual-band microwave absorption properties of novel VB-group disulphides (3R–TaS2) nanosheets","authors":"Liquan Fan , Honglin Ai , Meiye Jiao , Yao Li , Yongheng Jin , Yiru Fu , Jing Wang , Yuwei Wang , Deqing Zhang , Guangping Zheng , Junye Cheng","doi":"10.1016/j.nanoms.2024.05.011","DOIUrl":"10.1016/j.nanoms.2024.05.011","url":null,"abstract":"<div><div>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–TaS<sub>2</sub> 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 TaS<sub>2</sub> 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<sub>min</sub>) 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–TaS<sub>2</sub> 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–TaS<sub>2</sub> as caused by their stacked structures, which could be promising low-frequency absorbers.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 635-646"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Nano Materials Science Pub Date : 2024-10-01 DOI: 10.1016/j.nanoms.2023.10.005

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

{"title":"Revisiting the mitigation of coke formation: Synergism between support & promoters' role toward robust yield in the CO2 reformation of methane","authors":"Zahra Taherian , Vahid Shahed Gharahshiran , Xiaoxuan Wei , Alireza Khataee , Yeojoon Yoon , Yasin Orooji","doi":"10.1016/j.nanoms.2023.10.005","DOIUrl":"10.1016/j.nanoms.2023.10.005","url":null,"abstract":"<div><div>CO<sub>2</sub> reformation of methane (CRM) and CO<sub>2</sub> 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 % CH<sub>4</sub> and H<sub>2</sub>/CO ratio of approximately 100 % and also for CO<sub>2</sub> methanation with the conversion of carbon dioxide (82 %) and the selectivity toward methane reaches 100 % at temperatures above 300 <sup>ᵒ</sup>C. 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.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 536-547"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139101991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Nano Materials Science Pub Date : 2024-10-01 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

{"title":"Progress in doping and crystal deformation for polyanions cathode based lithium-ion batteries","authors":"Sajeela Awasthi , Srikanta Moharana , Vaneet Kumar , Nannan Wang , Elham Chmanehpour , Anupam Deep Sharma , Santosh K. Tiwari , Vijay Kumar , Yogendra Kumar Mishra","doi":"10.1016/j.nanoms.2024.01.004","DOIUrl":"10.1016/j.nanoms.2024.01.004","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 504-535"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139892761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Nano Materials Science Pub Date : 2024-10-01 DOI: 10.1016/j.nanoms.2024.01.003

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

{"title":"Chemical incorporation of SiO2 into TiO2 layer by green plasma enhancer and quencher agents for synchronized improvements in the protective and bioactive properties","authors":"Mosab Kaseem , Ananda Repycha Safira , Mohammad Aadil , Han-Choel Choe","doi":"10.1016/j.nanoms.2024.01.003","DOIUrl":"10.1016/j.nanoms.2024.01.003","url":null,"abstract":"<div><div>This study explores the dynamic interaction between environmentally sustainable plasma enhancer and quencher agents during the incorporation of SiO<sub>2</sub> into a TiO<sub>2</sub> 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 (SiO<sub>2</sub>) 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 SiO<sub>2</sub> 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 TiO<sub>2</sub>-based coatings.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 596-610"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Nano Materials Science Pub Date : 2024-10-01 DOI: 10.1016/j.nanoms.2024.01.006

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

{"title":"Synthesis of reduced graphene oxide nanosheets from sugarcane dry leaves by two-stage pyrolysis for antibacterial activity","authors":"Baskar Thangaraj , Pravin Raj Solomon , Nutthapon Wongyao , Mohamed I. Helal , Ali Abdullah , Sufian Abedrabbo , Jamal Hassan","doi":"10.1016/j.nanoms.2024.01.006","DOIUrl":"10.1016/j.nanoms.2024.01.006","url":null,"abstract":"<div><div>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 (<em>Saccharum officinarum</em>) 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.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 625-634"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139632563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utilizing a defective MgO layer for engineering multifunctional Co-MOF hybrid materials with tailored leaf-like and polyhedral structures for optimal electrochemical and photocatalytic activities 利用有缺陷的氧化镁层设计具有定制叶状和多面体结构的多功能 Co-MOF 混合材料，以获得最佳电化学和光催化活性

IF 9.9 2区材料科学

Nano Materials Science Pub Date : 2024-10-01 DOI: 10.1016/j.nanoms.2023.12.003

Mohammad Aadil, Muhammad Ali Khan, Safira Ananda Repycha, Mosab Kaseem

{"title":"Utilizing a defective MgO layer for engineering multifunctional Co-MOF hybrid materials with tailored leaf-like and polyhedral structures for optimal electrochemical and photocatalytic activities","authors":"Mohammad Aadil, Muhammad Ali Khan, Safira Ananda Repycha, Mosab Kaseem","doi":"10.1016/j.nanoms.2023.12.003","DOIUrl":"10.1016/j.nanoms.2023.12.003","url":null,"abstract":"<div><div>The hybridization of metal-organic framework (MOF) with inorganic layers would lead to the discovery of novel hybrid materials that can provide a compelling strategy for enhancing its photocatalytic and electrochemical response. In the present study, a highly efficient multifunctional hybrid material was developed by exploiting the defective layer formed on AZ31 Mg alloy through plasma electrolytic oxidation (PEO) as a nucleation and growth site for Co-MOF. The concentrations of the organic linker 2-Methylimidazole (2,MIm) and cobalt nitrate as a source of Co<sup>2+</sup> ions were varied to control the growth of the obtained Co-MOF. Lower concentrations of the 2, MIm ligand favored the formation of leaf-like MOF structures through an anisotropic, two-dimensional growth, while higher concentrations led to rapid, isotropic nucleation and the creation of polyhedral Co-MOF structures. The sample characterized by polyhedral Co-MOF structures exhibited superior electrochemical stability, with the lowest corrosion current density (3.11 × 10<sup>−9</sup> A/cm<sup>2</sup>) and the highest top layer resistance (2.34 × 10<sup>6</sup> Ω cm<sup>2</sup>), and demonstrated outstanding photocatalytic efficiency, achieving a remarkable 99.98 % degradation of methylene blue, an organic pollutant, in model wastewater. To assess the active adsorption sites of the Co-MOF, density functional theory (DFT) was utilized. This study explores the changes in morphologies of the coatings of Co-MOF with the change of solution concentration to form coatings with enhanced properties on the metallic substrate, which could establish the groundwork for the development of next-generation multifunctional frameworks with diverse applications.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 548-564"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138686967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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

Nano Materials Science Pub Date : 2024-10-01 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

{"title":"Nickel-based superalloy architectures with surface mechanical attrition treatment: Compressive properties and collapse behaviour","authors":"Lizi Cheng , Xiaofeng Zhang , Jiacheng Xu , Temitope Olumide Olugbade , Gan Li , Dongdong Dong , Fucong Lyu , Haojie Kong , Mengke Huo , Jian Lu","doi":"10.1016/j.nanoms.2023.11.008","DOIUrl":"10.1016/j.nanoms.2023.11.008","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 587-595"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139102011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Silicon-based dielectric elastomer with amino-complexed hybrids towards high actuation performance 硅基介电弹性体与氨基络合混合物的高致动性能

IF 9.9 2区材料科学

Nano Materials Science Pub Date : 2024-10-01 DOI: 10.1016/j.nanoms.2023.12.009

Zhengxing Dai , Qingqing Liu , Xiaodong Qi , Nan Zhang , Ting Huang , Jinghui Yang , Yong Wang

{"title":"Silicon-based dielectric elastomer with amino-complexed hybrids towards high actuation performance","authors":"Zhengxing Dai , Qingqing Liu , Xiaodong Qi , Nan Zhang , Ting Huang , Jinghui Yang , Yong Wang","doi":"10.1016/j.nanoms.2023.12.009","DOIUrl":"10.1016/j.nanoms.2023.12.009","url":null,"abstract":"<div><div>For improving the actuation performance at low electric fields of dielectric elastomers, achieving high dielectric constant (<em>ɛ</em><sub><em>r</em></sub>) and low modulus (<em>Y</em>) simultaneously has been targeted in the past decades, but there are few ways to accomplish both. In contrast to the classical strategies such as incorporating plasticizers or ceramic to prepare the silicon-based dielectric elastomers, here, blending an amino-complexed hybrid (polyethyleneimine (PEI)-Ag) with polydimethylsiloxane (PDMS) elastomer is reported as an alternative strategy to tailor the <em>ɛ</em><sub><em>r</em></sub> and <em>Y</em>. PEI-Ag not only exhibits excellent dielectric enhancement properties but also minimizes the PDMS crosslinking through amino-complexed reaction between PEI and Pt catalysts. The prepared dielectric elastomers have a <em>ɛ</em><sub><em>r</em></sub> of 7.2 @ 10<sup>3</sup> Hz and <em>Y</em> of 1.14 MPa, leading to an actuation strain of 22.27 % at 35 V/μm. Hence, incorporating such novel hybrids based on dual amino-complexed effect on both matrix and particles sufficiently promotes the actuated performance of dielectric elastomers.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"6 5","pages":"Pages 576-586"},"PeriodicalIF":9.9,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139063551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0