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Extrinsic Er2O3-inspired H2O adsorption and dissociation on surface of industrial fly ash-derived SiO2 aerogel in electrocatalytic CO2 reduction 认领 引用
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作者 Lifeng Han Haorun Li +10 位作者 Kunming Hou Yan Guo Hao Wu Mengbo Zou Yulu Wang Zhihua Guo Huangdong Wang Guixiang Ma Shangpeng Liu Xiaojun Gu Shanghong Zeng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期714-724,I0017,共11页
Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO_(2... Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO2RR).However,how to select and arrange active sites on its surface poses significant challenges due to its non-conductive nature.Here,we subtly designed and synthesized multi-component architectures to achieve the high efficiency of CO2RR to CO.The embedding of active and amorphous nitrogen-doped carbon(NC)nanosheets on the surface and inside of SiO2aerogel ensures the charge transport on the catalyst surface,and Er2O3improves dissociation of H2O,enabling the supply of protons for CO2RR.Simultaneously,Er2O3-induced defects/vacancies,nanoclusters coordinated with N on amorphous NC and single Ni in NC play crucial role in enhancing adsorption and activation of CO2.Consequently,the Ni-Er2O3/NC-SiO2catalyst exhibits the maintenance of FECOhigher than 95%over a wide potential window(-0.22 to-1.12 V vs.RHE)in a flow cell with gas-liquid-solid electrode.This work not only provides an atomistic understanding of nature of active sites in CO2RR but also contributes to the secondary utilization of industrial fly ash for a carbon-neutral future. 展开更多
关键词 Fly ash utilization SiO2aerogel Er2O3 H2O dissociation CO2electrochemical reduction
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Ionic potential mediated compositional-structural dual gradient engineering in P2/O3 cathodes for high-energy sodium storage 认领 引用
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作者 Zongyu Guan Meng Li +8 位作者 Ao Chen Jihuan Xie Aoci Yang Yang Gu Guoyao Pang Kuan Wang Weidong Zhuang Jiangtao Hu Biwei Xiao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期791-800,I0019,共10页
Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by rel... Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by relatively low energy density.Here,we report a scalable Mn-Fe-Ni layered oxide with a compositional-structural dual-gradient(DG)architecture synthesized via a three-step co-precipitation method.By exploiting the opposite roles of high-ionic-potential Mn and low-ionic-potential Fe in stabilizing the P2 and O3 frameworks,respectively,a pure compositional Mn/Fe gradient is translated into a structural P2/O3 gradient with precisely guided synthesis conditions.The Fe-deficient surface effectively suppressed Fe4+-induced side reactions,while the stable P2-type shell and the enlarged R value of the O3 core further enhanced cycling stability during structural evolution.The optimized cathode delivered an energy density of 478 Wh kg-1at 4.2 V,with 82%capacity retention after 200 cycles in half cells and 91%retention after 1600 cycles in full cells.This study demonstrates a viable pathway for developing high-energy-density and long-lifetime cathodes for sodium-ion batteries. 展开更多
关键词 Sodium-ion battery Cathode Double-gradient materials O3/P2 materials
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In2S3/HOF S-scheme heterojunction for enhanced photocatalytic H2O2 production 认领 引用
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作者 Yong Zhang Wenjun Zhu +1 位作者 Yanyan Zhao Shumin Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第5期261-273,共13页
As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their ... As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their practical application in photocatalytic H2O2production.To address the above challenges,this work employs a wet chemical method to grow In2S3nanosheets in situ on the surface of highly stable HOF nanorods(PFC-1),resulting in a novel inorganic/organic In2S3/PFC-1(IP)S-scheme heterojunction.The optimal IP composite achieves a significantly improved photocatalytic H2O2evolution rate of 3.78 mmol g-1h-1,which is 2.9-and 3.7-fold than that of In2S3and PFC-1,respectively.The elevated visible-light absorption,abundant active sites,and effective charge separation of IP S-scheme heterojunction result in the improvement in photocatalytic performance.Additionally,photocatalytic H2O2production of IP goes through a two-electron O2 reduction reaction pathway.This work offers a novel strategy for the fabrication of efficient HOF-based S-scheme heterostructures and their application in photocatalytic field. 展开更多
关键词 Hydrogen-bonded organic frameworks In2S3 S-scheme photocatalyst O2 reduction Photocatalytic H2O2production
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Fe-Co/Al(2)O3多孔介质催化剂催化低浓度瓦斯燃烧特性 认领 引用
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作者 韩家章 曹运齐 +4 位作者 肜浩楠 翟成 李点尚 童校长 刘方 《煤炭科学技术》 EI CAS CSCD 北大核心 2026年第6期183-195,共13页
针对8%以下煤矿低浓度瓦斯利用率低与大量排空造成能源浪费和温室效应问题,采用超声辅助浸渍法制备了负载Fe2O3与Co3O4双活性组分的Fe-Co/Al(2)O3双金属多孔介质催化剂,在渐变孔密度燃烧器中开展低浓度甲烷催化燃烧性能研究,... 针对8%以下煤矿低浓度瓦斯利用率低与大量排空造成能源浪费和温室效应问题,采用超声辅助浸渍法制备了负载Fe2O3与Co3O4双活性组分的Fe-Co/Al(2)O3双金属多孔介质催化剂,在渐变孔密度燃烧器中开展低浓度甲烷催化燃烧性能研究,重点考察了过量空气系数φa和流量f对燃烧特性的影响,并测试了长期燃烧稳定性。结果表明:Fe-Co/Al(2)O3中的Fe、Co双金属协同参与了CH4催化反应,Fe3+和Co3+在反应中被部分还原为Fe2+和Co2+物种,CoFe2O4尖晶石结构的形成提高了催化剂的热稳定性和抗烧结能力,使其在高温贫燃过程中保持良好的催化活性。CH4氧化反应遵循MvK机制,晶格氧参与CH4中C—H键断裂与活化,其消耗形成氧空位;吸附氧动态补充晶格氧,在维持氧物种迁移与循环的同时进一步促进中间产物氧化。过量空气系数和流量显著影响温度分布与火焰迁移,低过量空气系数或低流量易引发燃烧回火,高过量空气系数或高流量则会导致脱火风险;多孔介质渐变孔结构的热缓冲作用与催化反应的持续放热减缓了温度波动并提高了火焰稳定性。在φa=2.44~2.56与f=50~65 L/min,火焰锚定于燃烧器中游,燃烧温度维持在800℃以上,且NOx排放极低。在φa=2.56下,燃烧持续72 h预热区温度仍保持在220℃左右,CH4转化率接近100%,表明渐变多孔介质与催化反应的耦合显著提高了贫燃特性和稳定性。本研究为煤矿低浓度瓦斯的清洁高效利用提供了新的思路和技术支撑。 展开更多
关键词 低浓度甲烷 多孔介质催化燃烧 Fe-Co/Al(2)O3 燃烧特性 稳定性
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石墨烯对光固化Al2O3陶瓷力学性能的影响 认领 引用
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作者 刘耀 余庆轩 +3 位作者 王中原 文蓉江 李澜波 占丽娜 《热加工工艺》 CAS 北大核心 2026年第13期75-82,共8页
针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含... 针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含量的石墨烯,制备高固相、低粘度的光固化浆料。通过傅里叶红外光谱、旋转流变仪、沉降试验及Beer-Lambert模型分析,优化了浆料配方与光固化工艺参数。结果表明:当KH560含量为2.5wt%、石墨烯含量为0.01wt%时,浆料粘度最低、沉降分层最少;在曝光时间4 s条件下,添加0.01wt%石墨烯的浆料透射深度为382μm,临界曝光能量为44.3 m J/cm2。经1750℃烧结后,陶瓷零件致密度达99.7%,弯曲强度为27.61 MPa,维氏硬度为13.45GPa。石墨烯通过位阻效应及裂纹偏转机制有效促进了烧结致密化并改善了力学性能。本研究为光固化增材制造高致密、高性能氧化铝陶瓷提供了试验依据。 展开更多
关键词 石墨烯 光固化 Al2O3陶瓷 浆料 流变性能
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釉中SiO2和Al2O3含量对青花瓷“晕散”的影响研究 认领 引用
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作者 李小龙 胡其国 +2 位作者 赵田贵 董伟霞 包启富 《中国陶瓷》 CAS CSCD 北大核心 2026年第7期79-88,共10页
青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光... 青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光谱(FTIR)、电子探针(EPMA)、光学显微镜(OM)等设备分析青花瓷釉中SiO2和Al2O3含量对青花装饰晕散距离、微观结构、釉层网络结构以及釉中Co2+浓度的影响,结合理论计算阐明了青花瓷“晕散”与釉料黏度之间的关系。实验结果表明,随着釉中SiO2和Al2O3含量的增加,釉层网络结构中Si—O—Si键数量增多并且增强,釉层黏度增大;黏流活化能拟合结果表明,黏流活化能增大,原子间作用力越强,Co2+在釉中扩散越困难,青花瓷线条的“晕散”距离从250μm减小到10μm。本研究有助于从物理化学角度理解青花“晕散”机制,为青花装饰工艺的优化提供科学依据。 展开更多
关键词 青花瓷 SiO2 Al 2O3 晕散 黏流活化能
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V2O5/TiO2和Cs/Co3O4催化剂联合催化脱除NOx和N2O 认领 引用
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作者 苗静文 樊星 +1 位作者 刘若雯 张雅坤 《环境工程》 CAS CSCD 2026年第2期103-111,共9页
针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础... 针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础上,重点考察了在V2O5/TiO2催化剂之后串接2.0Cs/Co3O4催化剂的联合催化脱除NOx和N2O的性能,并采用N2吸脱附、XRD、XPS和O2-TPD等手段对催化剂理化特性进行表征。结果表明:V2O5/TiO2催化还原NOx时,进气中含2%H2O有利于拓宽活性温度窗口和提高N2选择性,以及抑制N2O形成。在Co3O4表面负载2.0%Cs显著提高了催化剂催化N2O分解性能,这可能与Cs的引入导致部分Co3+还原为Co2+以及催化剂表面形成了更多氧空位有关。高温(400℃)下通入2%H2O对2.0Cs/Co3O4催化N2O分解的抑制作用较弱,但同时通入2%H2O和50×10-6 NO显著抑制了2.0Cs/Co3O4催化剂的活性。采用先V2O5/TiO2后2.0Cs/Co3O4的两段式催化剂联合脱除NOx和N2O时,前端的V2O5/TiO2催化剂主要催化NOx的还原反应,N2O对脱硝过程的影响有限;在V2O5/TiO2催化剂高效脱除NOx(和NH3)的温度范围内,后端的2.0Cs/Co3O4催化剂可较为稳定地催化N2O分解;在温度400℃,进气中含2%H2O时,NOx和NH3转化率均接近100%,N2O转化率为61.3%。 展开更多
关键词 NOx还原 N2O分解 V2O5/TiO2 Cs/Co3O4 联合催化
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Tri-functional Ru catalyst drives efficient ammonia synthesis from N2 and H2O 认领 引用
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作者 Ying Hou Wei Hu +6 位作者 Qiao Zhao Yuchuan Tu Guang Yang Yi Cui Wei Liu Liang Yu Dehui Deng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第7期769-775,I0018,共7页
1.Indroduction In light of the global transition toward carbon neutrality,the development of mild-condition ammonia synthesis technologies has gained significant attention as a promising solution to address the inhere... 1.Indroduction In light of the global transition toward carbon neutrality,the development of mild-condition ammonia synthesis technologies has gained significant attention as a promising solution to address the inherent limitations of the traditional Haber-Bosch approach,which remains highly energy-intensive due to the extreme operation conditions(above 350℃ and over 10 MPa)required to activate the robust N≡N bond(945 kJ mol-1).Furthermore,the process is carbon-intensive,as its primary hydrogen source is derived from hydrocarbon reforming with high carbon emissions[1,2]. 展开更多
关键词 NH3 synthesis N and H2O Tri-functional Ru-based catalyst Reversible Li battery
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镁合金表面超音速等离子喷涂Al-Al2O3/5YSZ涂层的组织与耐磨性能研究 认领 引用
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作者 任东亭 李健 +6 位作者 王文权 张东 邵晓宙 尹厚 郝晓华 温毅 康文凯 《热加工工艺》 CAS 北大核心 2026年第9期106-113,共8页
采用超音速等离子喷涂技术,在AZ61镁合金表面制备了不同Al2O3陶瓷含量的Al-Al2O3(AA)涂层以及不同Al2O3/5YSZ陶瓷含量的Al-Al2O3/5YSZ(AAZ)涂层,研究了YSZ的加入以及陶瓷含量对涂层微观组织、孔隙率、显微硬度... 采用超音速等离子喷涂技术,在AZ61镁合金表面制备了不同Al2O3陶瓷含量的Al-Al2O3(AA)涂层以及不同Al2O3/5YSZ陶瓷含量的Al-Al2O3/5YSZ(AAZ)涂层,研究了YSZ的加入以及陶瓷含量对涂层微观组织、孔隙率、显微硬度以及耐磨性能的影响。结果表明,AAZ涂层的截面组织相比AA涂层得到了细化,组织更为均匀,减少了Al2O3相中的孔隙,YSZ以带状和微小球形颗粒弥散分布。涂层的显微硬度随着Al2O3/5YSZ含量的增加而增大,相比AA涂层,AAZ涂层具有更高的硬度值。在滑动摩擦磨损试验中,AAZ涂层硬度的提升使涂层的黏着磨损程度相较AA涂层降低。50%陶瓷含量的AAZ涂层的耐磨性低于30%和70%陶瓷含量的涂层,涂层原始组织中大量的相界面缝隙降低了金属相与陶瓷颗粒的粘结强度,导致陶瓷颗粒的脱落,增加了摩擦系数和磨损速率。30%陶瓷含量的AAZ涂层发生了磨粒磨损和黏着磨损。70%陶瓷含量的AAZ涂层具有最优的耐磨性,磨痕中散落的磨屑在磨损中起到了减摩润滑的作用。 展开更多
关键词 超音速等离子喷涂 镁合金 Al-Al2O3涂层 氧化钇稳定氧化锆(YSZ) 孔隙率 耐磨性
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GNS对3%MoS2-Ni3Al基摩擦材料组织及摩擦性能的影响 认领 引用
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作者 付传起 李家祥 +2 位作者 李万万 张欢枝 王通 《表面技术》 EI CAS CSCD 北大核心 2026年第13期61-75,共15页
目的优化3%MoS-Ni3Al基摩擦材料的力学性能与摩擦学性能,满足航空航天等领域对极端工况材料的需求。方法采用粉末冶金技术冷压成型+烧结工艺制备含0%~2%(质量分数)纳米石墨烯片(GNS)的复合材料,通过X射线衍射、扫描电子显微镜、X射... 目的优化3%MoS-Ni3Al基摩擦材料的力学性能与摩擦学性能,满足航空航天等领域对极端工况材料的需求。方法采用粉末冶金技术冷压成型+烧结工艺制备含0%~2%(质量分数)纳米石墨烯片(GNS)的复合材料,通过X射线衍射、扫描电子显微镜、X射线光电子能谱等手段分析材料物相组成、微观形貌及表面化学态,结合力学性能测试与环块磨损试验,探究GNS含量对材料力学性能、室温及500℃下摩擦性能的影响规律,并通过磨痕形貌与磨屑成分分析揭示不同工况下的磨损机理。结果GNS的加入使3%MoSz-Ni3A1基摩擦材料密度随其含量增加呈下降趋势,抗压强度和硬度呈先升后降趋势;室温及500℃下,材料摩擦系数和磨损率均随GNS含量增加呈先降后升趋势,且500℃下各配比试样摩擦系数较室温提升20%~25%、磨损率提升25%~30%,转速依赖性也更显著。当GNS含量(质量分数)为1.5%时,材料综合性能最优,布氏硬度达168HBS、抗压强度达392MPa,室温1400r/min工况下摩擦系数降至0.284,磨损率较基体降低54%;500℃下该配比试样仍为各转速下最优,磨损率维持在4.0×10-7~6.5×10-7mg/m,其室温1400r/min下磨损机理为氧化磨损和黏着磨损。GNS含量不足时,材料润滑效果不佳,含量(质量分数)超2%则出现团聚,导致材料致密性下降、力学与摩擦学性能劣化,且500℃下团聚的负面影响被进一步放大。结论石墨烯对3%MoS2-NiA1基摩擦材料的组织与性能具有显著调控作用,在石墨烯含量(质量分数)为1.5%时,摩擦材料性能最优。 展开更多
关键词 3%MoS-NiA1基摩擦材料 石墨烯 粉末冶金 协同润滑机制 力学性能 摩擦学性能
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Preparation of Ni/Ti3O5@graphene oxide double heterojunction for enhancing hydrogen storage in MgH2 认领 引用 被引量：1
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作者 Zexuan Yang Zhendong Ma +4 位作者 Yongjin Zou Cuili Xiang Lixian Sun Yongpeng Xia Yong Shen Chua 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期579-591,共13页
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetic... Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions. 展开更多
关键词 MGH2 Dual heterojunction Ni/Ti3O5@graphene oxide
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甲基环己烷(MCH)高效脱氢Pt/Al2O3催化剂载体性能优化及Pt的高分散机制 认领 引用 被引量：1
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作者 苏健利 李长旭 +6 位作者 陈春明 安会丽 于峰 陈树伟 潘大海 闫晓亮 李瑞丰 《化学学报》 SCIE CAS CSCD 北大核心 2026年第1期20-29,共10页
以经溶剂限域水解-聚合法所得介孔氧化铝(MA)为载体,借助焙烧条件的调控,优化MA的晶相、织构及表面性质,提高低负载量Pt(w=0.5%)在MA孔壁表面上的分散度,继而提升所得催化剂对甲基环己烷(MCH)脱氢反应的催化性能.结果表明,经450℃焙烧后... 以经溶剂限域水解-聚合法所得介孔氧化铝(MA)为载体,借助焙烧条件的调控,优化MA的晶相、织构及表面性质,提高低负载量Pt(w=0.5%)在MA孔壁表面上的分散度,继而提升所得催化剂对甲基环己烷(MCH)脱氢反应的催化性能.结果表明,经450℃焙烧后, MA载体具有γ-Al2O3晶相和较高的比表面积,且孔壁表面存在大量与Pt前体(氯铂酸)分子强静电键合作用的Ib型Al-OH,可促使Pt以超小纳米团簇形式高度均匀分散,致使所得催化剂展现出较现有Pt基催化剂更优异的MCH脱氢催化活性.例如,在300℃低温下,催化剂Pt/MA-450显示出高达2112 mmol·gPt-1·min-1的析氢速率,且在100 h反应过程或再生循环使用过程中仍能保持80%以上的初始催化活性. 展开更多
关键词 介孔材料 甲基环己烷(MCH)脱氢 Pt/Al2O3催化剂 载体-Pt前体界面作用 铝羟基
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Al/Bi2O3含能薄膜增强半导体桥的电爆与火焰输出特性 认领 引用
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作者 王云鹏 董晓芬 +3 位作者 王端 王凯炳 李思宇 李晨铭 《火工品》 CAS CSCD 北大核心 2026年第3期24-30,共7页
为提升半导体桥(SCB)在低压下的可靠性与能量输出,本文在桥区原位集成Al/Bi2O3含能薄膜,构建含能半导体桥(ESCB)。采用射频磁控溅射技术制备了总厚度2.8μm、调制周期280 nm的多层Al/Bi2O3薄膜,SEM与XRD表征表明其结构致密... 为提升半导体桥(SCB)在低压下的可靠性与能量输出,本文在桥区原位集成Al/Bi2O3含能薄膜,构建含能半导体桥(ESCB)。采用射频磁控溅射技术制备了总厚度2.8μm、调制周期280 nm的多层Al/Bi2O3薄膜,SEM与XRD表征表明其结构致密、层状清晰,物相纯净。电爆测试显示:30 V低压下,ESCB临界激发时间(8.9μs)与能量(3.73 mJ)较SCB显著降低;50 V高压下,火焰高度达12 mm,持续时间520μs(约为SCB的1.8倍),燃烧区域覆盖桥区约3/4,且电爆总耗能提升46%。结果表明,Al/Bi2O3薄膜有效拓宽SCB工作区间,实现“低压易激发-高压强输出”的宽域能量增益,为微型起爆器件设计提供了有效技术路径。 展开更多
关键词 半导体桥 含能薄膜 Al/Bi2O3 电爆性能 磁控溅射
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(B4C+Al2O3)/Al中子吸收材料的稳定化工艺 认领 引用
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作者 石宝铭 昝宇宁 +2 位作者 王全兆 肖伯律 马宗义 《科技导报》 CAS CSCD 北大核心 2026年第2期98-107,共10页
(B4C+Al2O3)/Al复合材料作为乏燃料干式贮存系统中的关键中子吸收材料,其在高温下长期服役的可靠性直接关系到核废料安全管理的有效性。该结构功能一体化材料在高温下存在非晶Al2O3(am-Al2O3)向γ-Al2O3相... (B4C+Al2O3)/Al复合材料作为乏燃料干式贮存系统中的关键中子吸收材料,其在高温下长期服役的可靠性直接关系到核废料安全管理的有效性。该结构功能一体化材料在高温下存在非晶Al2O3(am-Al2O3)向γ-Al2O3相变的风险,可能导致力学性能降低,但目前对其组织演化规律及性能稳定性的认识仍不足。为此,对(B4C+Al2O3)/Al复合材料进行了400℃/100 h和550℃/8 h 2种稳定化工艺处理,并通过400℃下最长4000 h的退火实验验证其长期稳定性。结果表明,经稳定化处理后,复合材料在室温及350℃下的抗拉强度分别保持在220.0和100.0 MPa以上,满足工程应用需求。微观组织分析表明,am-Al2O3部分转化为γ-Al2O3,但材料在退火过程中组织与性能均趋于稳定。2种工艺均能有效提升材料的热稳定性,为(B4C+Al2O3)/Al复合材料制备的乏燃料干式贮存容器实现长期安全服役提供了材料学依据。 展开更多
关键词 中子吸收材料 (B4C+Al2O3)/Al复合材料 稳定化工艺 力学性能 微观组织
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Al/Bi2O3含能半导体桥的安全性能研究 认领 引用
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作者 王云鹏 董晓芬 +1 位作者 王端 王凯炳 《爆破器材》 CAS CSCD 北大核心 2026年第2期8-14,共7页
针对半导体桥(SCB)火工品输出能量较低的问题,设计并制备了Al/Bi2O3含能薄膜与SCB集成的含能半导体桥(ESCB)。通过恒流安全试验、电磁辐照试验、静电安全性试验,对其安全性能进行测试;并通过SCB和Al/Bi2O3-ESCB对B/KNO3钝... 针对半导体桥(SCB)火工品输出能量较低的问题,设计并制备了Al/Bi2O3含能薄膜与SCB集成的含能半导体桥(ESCB)。通过恒流安全试验、电磁辐照试验、静电安全性试验,对其安全性能进行测试;并通过SCB和Al/Bi2O3-ESCB对B/KNO3钝感点火药的点火试验,验证了Al/Bi2O3-ESCB的输出性能。结果表明:所制备的Al/Bi2O3含能薄膜成分均匀,结构平滑,与SCB集成制备的Al/Bi2O3-ESCB安全性能良好;安全电流达到1.2 A,可通过100 MHz(700 V/m)、400 MHz(700 V/m)、900 MHz(560 V/m)3种条件下的电磁辐照,且性能不发生明显变化;静电放电试验不发火,且电阻不发生明显变化。相较于SCB,可明显提升对恒流激励的抵抗能力和点火输出能力。在47μF、50 V电容激励时,接触条件下和1.3 mm以内非接触条件下均能可靠点燃B/KNO3钝感点火药。 展开更多
关键词 含能薄膜 半导体桥 Al/Bi2O3 安全性能
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Dual roles of oxygen-annealing in modulating the superconductivity of La3Ni2O7+δ 认领 引用
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作者 Xin-Ran Hu Jia Yu +17 位作者 Jun-Kun Yi Ya-Dong Gu Jun-Jie Feng Xie-Yu Sun Qing-Song Liu Yun-Qing Shi Meng-Hu Zhou Hui-Ran Sun Chang-Sheng Jiang Qi-Heng Huang Tao Han Ming-Sheng Long Xing-Yuan Hou Bing-Hui Ge Dong-Sheng Song Zhi-An Ren Qing-Ge Mu Lei Shan 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期166-174,共9页
Oxygen deficiency is known to critically influence the superconductivity of La3Ni2O7-δ.However,precise control of oxygen content to mitigate such deficiencies remains a significant challenge.In this work,we ... Oxygen deficiency is known to critically influence the superconductivity of La3Ni2O7-δ.However,precise control of oxygen content to mitigate such deficiencies remains a significant challenge.In this work,we synthesized high-oxygencontent La3Ni2O7+δpolycrystals via high-pressure oxygen annealing with the oxygen stoichiometry(δ)successfully tuned by varying the amount of KClO4.The obtained samples La3Ni2O7.16and La3Ni2O7.38exhibit metallic behavior at ambient pressure.We further conducted a comprehensive investigation into the pressure-induced superconductivity and atomic structure.STEM imaging revealed large-area bilayer-phase stacking in La3Ni2O7.16,while La3Ni2O7.38showed noticeable intergrowth with other Ruddlesden-Popper(R-P)phases.Notably,the critical pressure in La3Ni2O7.16is substantially reduced,though its critical temperature(Tc)is lower than that of as-grown samples.In contrast,only a weak superconducting signal was detected in higher oxygen content sample La3Ni2O7.38likely due to the intergrowth with other R-P phases,nonnegligible interstitial oxygen,or an increased fraction of the tetragonal phase.Our findings provide a viable pathway for optimizing nickelate superconductivity and offer insights into the fundamental mechanisms governing superconductivity in these materials. 展开更多
关键词 oxygen-annealing at high pressure La3Ni2O7 high temperature superconductivity high pressure measurements
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ZrO2对Li2O-Al2O3-B2O3微晶玻璃析晶行为及微波介电性能的影响 认领 引用
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作者 倪宇博 陈志斌 +8 位作者 曾广 罗琼 陈巧 刘佳 李文俊 邹澳琪 王静 田培静 韩建军 《硅酸盐通报》 CAS 北大核心 2026年第3期835-844,共10页
随着5G技术的推进,微波和毫米波频段器件对高性能介电材料的需求日益增长。本文以Li2O-Al2O3-B2O3(LAB)体系微晶玻璃为研究对象,采用低温共烧法制备了能在超低温下烧结致密且具有优异微波介电性能的微晶玻璃,并研究了外... 随着5G技术的推进,微波和毫米波频段器件对高性能介电材料的需求日益增长。本文以Li2O-Al2O3-B2O3(LAB)体系微晶玻璃为研究对象,采用低温共烧法制备了能在超低温下烧结致密且具有优异微波介电性能的微晶玻璃,并研究了外加ZrO2对LAB微晶玻璃析晶行为及微波介电性能的影响。结果表明:当ZrO2掺量从0.2%(摩尔分数,下同)增至0.8%时,LAB微晶玻璃主晶相为LiBO2,析出晶体种类和数量基本没有变化。微晶玻璃Avrami指数n为3.05~3.89,表明该体系的晶体生长机制主要为体析晶,ZrO2的引入降低了微晶玻璃的析晶活化能。随着ZrO2掺量的增加,LAB微晶玻璃显微结构中气孔增多,体积密度也因此而降低。当外加0.2%ZrO2时,Z1微晶玻璃在650℃下烧结7 h具备良好的微波介电性能,微波相对介电常数εr=7.5,品质因素Q×f=16958 GHz,该微晶玻璃是一种良好的超低温共烧陶瓷(ULTCC)候选材料。 展开更多
关键词 Li2O-Al2O3-B2O3微晶玻璃 超低温共烧陶瓷 ZrO2 微波介电性能 析晶活化能 微观结构
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激光粉末床熔融制备Y2O3增强Ti6Al4V合金的组织与力学性能研究 认领 引用
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作者 董阳平 赵枢明 +14 位作者 朱金玉 张会华 赵文天 马国楠 庄辛鹏 孙预麟 杨鹏伟 张群 樊子煜 钟亮 杨广 鲁仁义 曹磊 马志远 王峰 《精密成形工程》 北大核心 2026年第2期21-30,共10页
目的针对Ti6Al4V合金在激光粉末床熔融(PBF-LB)过程中力学性能不足的问题,引入稀土氧化物Y2O3改善其性能。方法采用机械球磨法制备不同Y2O3含量的Ti6Al4V复合粉末,并通过PBF-LB技术成形合金件。利用扫描电镜、X射线衍射、... 目的针对Ti6Al4V合金在激光粉末床熔融(PBF-LB)过程中力学性能不足的问题,引入稀土氧化物Y2O3改善其性能。方法采用机械球磨法制备不同Y2O3含量的Ti6Al4V复合粉末,并通过PBF-LB技术成形合金件。利用扫描电镜、X射线衍射、电子背散射衍射和透射电镜等手段,系统分析了复合粉末及成形合金的微观结构、物相与元素分布;通过室温拉伸试验评估力学性能,并结合断口分析结果探究断裂机制。结果Y2O3在球磨后均匀附着于Ti6Al4V粉末表面。在PBF-LB成形过程中,Y2O3的引入显著细化了原始β晶粒和α/α'马氏体尺寸,并以纳米尺度的形式弥散分布在基体中,与α-Ti基体呈半共格关系。当Y2O3的质量分数为0.2%时,合金抗拉强度和屈服强度分别提高至1331 MPa和1208 MPa;但当Y2O3的质量分数增至0.3%时塑性下降。断口形貌由韧性韧窝逐渐转变为以解理面为主的脆性断裂。结论添加0.2%(质量分数)Y2O3能够细化原始β晶粒与α/α'马氏体组织,并通过纳米级Y2O3颗粒实现弥散强化。然而,当Y2O3质量分数增加至0.3%时,稀土氧化物颗粒发生团聚,引起局部应力集中,导致材料塑性严重下降。该研究为稀土氧化物在增材制造钛合金中的定量化改性提供了理论与实验依据。 展开更多
关键词 Ti6Al4V合金 Y2O3 激光粉末床熔融 增材制造 微观组织 力学性能
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Formulation,stability,and synergistic characteristics of diesel-inwater Pickering emulsions stabilized by titanium carbide(Ti3C2Tx)MXene and Tween 40 认领 引用
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作者 Nansee S.K.Abu Zaid Aaminah Johar +2 位作者 Mustafa S.Nasser Khaled A.Mahmoud Sagheer A.Onaizi 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期393-421,共29页
Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems com... Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems combining nanoparticles and surfactants offer a promising route to achieving both interfacial stability and formulation efficiency.Among potential nanoparticle candidates,Ti3C2TxMXene exhibits high surface area and interfacial activity.However,its application in diesel-in-water Pickering emulsions under EOR-relevant conditions has not been explored.Challenges such as high hydrophilicity and strong electrostatic repulsion have limited the use of unmodified MXene as a standalone stabilizer in colloidal systems.To address this limitation,diesel-in-water Pickering emulsions were formulated using DL-Ti3C2TxMXene combined with Tween 40(0.5 wt%)and antifoam(0.15 wt%),aiming to investigate their synergistic stabilization behavior across MXene concentrations ranging from 0.1 to 1.5 wt%.The MXene-only system exhibited complete and immediate phase separation,whereas the hybrid emulsions demonstrated markedly enhanced stability,with no phase separation observed at 0.1 and 0.5 wt%after 24 h.A concentration-dependent trend was evident.At lower MXene contents,interfacial adsorption improved,and droplet sizes remained small and uniform.At higher concentrations(≥1.0 wt%),aggregation increased,and demulsification became more pronounced.Interfacial tension decreased steadily with increasing MXene content,reaching 0.86 mN/m at1.5 wt%,while zeta potential remained strongly negative(-47.7 mV at 0.5 wt%),indicating sufficient electrostatic repulsion.Rheological analysis revealed a transition to shear-thinning behavior at higher MXene contents,confirming the formation of internal network structures.Compared to other reported systems based on silica(SiO2),zinc oxide(ZnO),or functionalized MXenes,the MXene-Tween 40formulation achieved superior short-and long-term emulsion stability without requiring surface modification or external stimuli.To the best of our knowledge,this is the first study to report the successful stabilization of diesel-in-water Pickering emulsions using unmodified Ti3C2TxMXene.These findings highlight the synergistic interaction between MXene and Tween 40 and present a robust,surfactant-lean formulation suitable for oilfield applications. 展开更多
关键词 Titanium carbide(Ti3C2Tx)MXene nanosheets Oil-in-water(O/W)Pickering emulsions Tween 40 chemical surfactant Pickering emulsion characteristics Emulsion stability Emulsion rheology
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Pressure dependence of the structures and transport properties of supercritical NaAlSi3O8-H2O fluids 认领 引用
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作者 Ziteng Long Yicheng Sun 《Acta Geochimica》 EI CAS CSCD 2026年第1期155-167,共13页
Supercritical fluids play a crucial role in material transport within Earth's deep interior.Investigating the pressure-dependent atomic structures and transport properties of such fluids is essential for understan... Supercritical fluids play a crucial role in material transport within Earth's deep interior.Investigating the pressure-dependent atomic structures and transport properties of such fluids is essential for understanding their petrological,chemical,and geophysical behaviors.In this study,we employed first-principles molecular dynamics simulations to explore the structures,self-diffusion coefficients(D),and viscosities(η)of supercritical NaAlSi3O8-H2O fluids under conditions of 2000 K and 3-10 GPa,with water contents of 30 wt% and 50 wt%.Our calculations indicate that at a water content of 30 wt%,Q2 and Q3 exhibit a certain degree of positive and negative pressure dependence,respectively,while other Qn species(n represents the number of bridging oxygens connected to Si/Al)show minimal changes.At a water content of 50 wt%,Q2 and Q0 exhibit a certain degree of positive and negative pressure dependence,respectively,while other Qn species show minimal changes.At both water contents,Si-O-H and molecular water in the system exhibit negative pressure dependence,suggesting that the migration of supercritical fluids from deep to shallow regions is accompanied by the release of water.The self-diffusion coefficients in the supercritical NaAlSi3O8-H2O fluid follow the order DNa≈DH>DO>DAl≈DSi,with an overall weak negative pressure dependence.By comparing the viscosities of anhydrous and hydrous silicate melts from previous studies,we found that the addition of water caused a transition from negative to positive pressure dependence of viscosity,corresponding to a structural change from polymerization to depolymerization.Additionally,we calculated the fluid mobility Δp/η of supercritical NaAlSi3O8-H2O fluids and found that their mobility is several orders of magnitude higher than that of basalt melt and is also significantly greater than that of carbonate melt.As supercritical fluids ascend from deeper to shallower regions,their mobility is further enhanced,significantly contributing to the transport of elements from subducting slabs to the overlying mantle wedge. 展开更多
关键词 Supercritical fluids NaAlSi3O8-H2O Firstprinciples Speciation Transport properties
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