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Fabrication and application of hierarchical mesoporous MoO2/Mo2C/C microspheres 认领 引用 被引量：4
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作者 Xiaoyan Li Qinggui xiao +2 位作者 Hongling Zhang Hongbin Xu Yi Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第3期940-948,共9页
Hierarchical mesoporous MoO2/Mo2C/C microspheres,which are composed of primary nanoparticles with a size of about 30 nm,have been designed and synthesized through polymer regulation and subsequent carbonization proces... Hierarchical mesoporous MoO2/Mo2C/C microspheres,which are composed of primary nanoparticles with a size of about 30 nm,have been designed and synthesized through polymer regulation and subsequent carbonization processes.The as-synthesized microspheres were characterized by XRD,Raman,SEM,TEM,XPS measurements and so on.It was found that polyethylene glycol acted as a structure-directing agent,mild reducing agent and carbon source in the formation of these hierarchical mesoporous Mo O2/Mo2C/C microspheres.Moreover,the electrochemical property of the microspheres was also investigated in this work.Evaluated as an anode material for lithium ion batteries,the hierarchical mesoporous Mo O2/Mo2C/C electrode delivered the discharge specific capacities of 665 and 588 m Ah/g after 100 cycles at current densities of 100 and 200 m A/g,respectively.The satisfactory cycling performance and controllable process facilitate the practical applications of the hierarchical mesoporous Mo O2/Mo2C/C as a potential anode material in high-energy density lithium-ion batteries. 展开更多
关键词 Lithium ion batteries Anode materials MoO2/Mo2C/C Mesoporous Polymer regulation
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MOFs衍生物金属催化剂的制备及其在CO2加氢热催化合成C1分子的研究进展 认领 引用 被引量：1
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作者 董美蓉 郑佳彬 +2 位作者 林泽填 刘洪传 陆继东 《洁净煤技术》 CAS CSCD 北大核心 2026年第5期168-182,共15页
近年来,随着全球气候变化和能源危机的不断加剧,二氧化碳资源化利用已成为当前研究的热点。利用由太阳能、风能等可再生能源制备的绿氢与CO2耦合,在催化剂的作用下,可实现燃料/化学品的制备,是解决氢能生产与CO2资源化利用的重要... 近年来,随着全球气候变化和能源危机的不断加剧,二氧化碳资源化利用已成为当前研究的热点。利用由太阳能、风能等可再生能源制备的绿氢与CO2耦合,在催化剂的作用下,可实现燃料/化学品的制备,是解决氢能生产与CO2资源化利用的重要途径之一。其中甲烷(CH4)、甲醇(CH3OH)和一氧化碳(CO)等重要C1分子,是重要的含碳燃料产品和化工原料,在提供能源和化学物质方面起着重要作用。金属有机框架(MOFs)衍生物金属催化剂是通过对MOFs材料进行高温处理等方式,制备出具有金属和金属氧化物纳米颗粒的复合催化剂。这类催化剂具有多活性位点及大接触面积、可调节孔结构、优异的表面酸碱性能以及高效的金属–载体相互作用等优点,在CO2加氢热催化合成C1分子方面展现出巨大的应用潜力。首先对MOFs衍生物金属催化剂的制备方法进行综述,重点介绍直接热解吸法、牺牲模板法和溶剂热法所制备MOFs衍生物金属催化剂的特点,其中,直接热解吸法能快速、简便地从MOFs前驱体制备金属及金属氧化物催化剂,适用于大规模生产和对制备成本较低的应用场景。牺牲模板法是通过降解模板材料制备具有特定形状、尺寸及多孔结构的催化剂,更适用于对材料结构需要精细调控的应用领域;溶剂热法是在密闭反应容器中利用金属离子与有机配体形成高度有序的网格结构,并通过后处理制备MOFs衍生物,制备条件较为温和,更适用于药物释放、分子分离和精细化学品合成。然后详细介绍了基于MOFs衍生物金属催化剂在CO2加氢合成CH4、CH3OH和CO等C1分子方面的研究进展,说明MOFs衍生物金属催化剂在控制金属纳米粒子的尺寸和分散性、增强金属–氧化物界面活性位点和防聚集复合结构方面的优点,对于提升CO2加氢催化性能和增强催化剂热稳定性的应用潜力。目前基于MOFs衍生物金属催化剂的CO2加氢生成CH4、CH3OH和CO的反应路径研究涉及较少,但MOFs衍生物金属催化剂本质上是金属和金属氧化物纳米颗粒的复合材料,因此主要探讨了基于金属/氧化物界面上生成CH4、CH3OH和CO的反应路径。最后展望了MOFs衍生物金属催化剂的开发及其在CO2加氢转化领域应用的未来研究方向。未来的研究方向可以从以下方面展开:一方面,开发新型的MOFs衍生物,以提高其CO2加氢反应过程的热催化性和化学稳定性;另一方面,精确调控MOFs衍生物金属催化剂活性位点,优化MOFs衍生物金属催化剂尺寸和分散性,以提高CO2加氢生成C1分子的选择性;此外,利用原位表征技术,实时监测并揭示MOFs衍生物金属催化剂在CO2加氢过程中所经历的动态变化机理,为深入理解其催化机制提供新的依据。 展开更多
关键词 MOFs衍生物金属催化剂 CO2加氢 C1分子 热催化 催化机理
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尿素热解制备氮掺杂Mo2C/AC及其催化还原NO2的性能提升机制 认领 引用
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作者 穆仕芳 王中兰 +1 位作者 尚如静 张玉龙 《高校化学工程学报》 EI CAS CSCD 北大核心 2026年第2期322-330,共9页
针对传统NO2检测用钼炉转化剂高温易失活及副反应干扰检测准确性的问题,文中采用浸渍-碳化法制备Mo2C/AC,利用尿素在400~800℃区间的热解实现氮掺杂改性,制得Mo2C/ACN-X系列催化剂。通过N2物理吸附-脱附、拉曼光谱、X射线衍射... 针对传统NO2检测用钼炉转化剂高温易失活及副反应干扰检测准确性的问题,文中采用浸渍-碳化法制备Mo2C/AC,利用尿素在400~800℃区间的热解实现氮掺杂改性,制得Mo2C/ACN-X系列催化剂。通过N2物理吸附-脱附、拉曼光谱、X射线衍射、X射线光电子能谱对催化剂结构进行表征,深入探讨氮掺杂调控催化剂结构与其催化NO2转化性能的提升机制。研究结果表明:氮掺杂后催化剂比表面积减小,Mo2C/ACN-800平均孔径增大;尿素热解温度对催化剂体相钼物种及其表面价态分布具有调控作用。400℃与600℃热解条件下,MoO2与Mo2C共存,800℃热解时Mo2C成为主导晶相。随热解温度升高,氮掺杂后催化剂表面Mo2+含量上升,其中Mo2C/ACN-800的Mo2+含量显著增加;表面氮含量先升高后下降,吡啶氮占比上升。在60℃条件下,Mo2C/ACN-800催化剂的NO2转化率达97.5%,较未掺杂样品提高了9.7%。研究结论为开发高效NO2低温转化剂开辟了新的材料设计思路,具有重要的理论与实际应用价值。 展开更多
关键词 尿素热解 氮掺杂 Mo2C/AC 催化还原NO2 低温转化
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水热诱导Mo2C/AC表面重构促进NO2低温高效催化转化 认领 引用
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作者 穆仕芳 王中兰 +1 位作者 尚如静 张玉龙 《高校化学工程学报》 EI CAS CSCD 北大核心 2026年第2期314-321,共8页
为提升钼炉转化剂在低温反应条件下的活性,文中对浸渍-碳热还原制备Mo2C/AC催化剂的浸渍过程进行水热强化,通过N2物理吸附-脱附、拉曼光谱、X射线衍射、X射线光电子能谱对催化剂结构进行表征,深入探讨水热强化对催化剂结构及其在NO_... 为提升钼炉转化剂在低温反应条件下的活性,文中对浸渍-碳热还原制备Mo2C/AC催化剂的浸渍过程进行水热强化,通过N2物理吸附-脱附、拉曼光谱、X射线衍射、X射线光电子能谱对催化剂结构进行表征,深入探讨水热强化对催化剂结构及其在NO2制NO反应中的催化性能影响机制。结果表明,经过水热处理后,样品比表面积均有不同程度减小,同时平均孔径有所增大。水热处理使催化剂表面发生重构,当水热处理温度控制在120℃时,催化剂缺陷程度最低,表面Mo含量与N含量达到最大值,尤其是有利于NO2吸附的吡啶氮含量明显高于其他样品。反应温度为50℃时,该催化剂对NO2的转化率达到100%。 展开更多
关键词 水热强化 Mo2C/AC 表面重构 NO2转化 钼炉转化剂
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Effective catalytic effects of Mo2C MXene on the hydrogen storage in magnesium hydride 认领 引用
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作者 Xiaojiao Wang Zhenluo Yuan +6 位作者 Yang Shi Shangsheng Li Guofa Mi Qiuming Peng Shumin Han Yanping Fan Baozhong Liu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第3期483-493,共11页
Magnesium hydride(MgH2)has received widespread attention because of its high hydrogen capacity and low cost,but the sluggish kinetics limited its practical application.Herein,the two-dimensional Mo2C MXene was c... Magnesium hydride(MgH2)has received widespread attention because of its high hydrogen capacity and low cost,but the sluggish kinetics limited its practical application.Herein,the two-dimensional Mo2C MXene was constructed to motivate the efficient hydrogen storage in MgH2for the first time.After doping 10 wt%Mo2C MXene,the starting dehydriding temperature was lowered to 225℃,presenting a 117℃ reduction compared with that of as-received MgH2.The 10 wt%Mo2C-containing MgH2sample could rapidly release 6.7 wt%H2in 13 min at 300℃,and the product after hydrogen release could absorb 6.0 wt%H2in 12 min at 200℃,showing superior hydriding and dehydriding kinetics.Moreover,the activation energy(Ea)of MgH2–10 wt%Mo2C(107.58±1.57 kJ/mol)was obviously lower than that of pure MgH2(130.45±1.97 kJ/mol),and the reduced activation energy explained the reduced dehydrogenation temperature and enhanced kinetics.Microstructure characterization revealed that Mo-species(Mo0and Mo2+)formed during ball milling served as active species accelerated the hydriding/dehydriding reactions,and the uniformly distributed active species and the interaction between Mo and O jointly promoted the hydrogen storage properties of MgH2. 展开更多
关键词 MgH2 Mo2C MXene Hydriding/dehydriding Kinetics
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Promising prospects of transition metal(Ti,Ni,Zr and Nb)-modified V2C MXenes for improving the hydrogen storage performance of magnesium hydride 认领 引用
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作者 Hua Ning Junyu Chen +3 位作者 Zhipeng Meng Zhiqiang Lan Haizhen Liu Jin Guo 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第5期1360-1370,共11页
The effect of modifying V2C using transition metals(TMs)(Ti,Ni,Zr,and Nb)on the MgH2dehydrogenation properties was investigated using the density functional theory(DFT).The adsorption energy,dehydrogenation ener... The effect of modifying V2C using transition metals(TMs)(Ti,Ni,Zr,and Nb)on the MgH2dehydrogenation properties was investigated using the density functional theory(DFT).The adsorption energy,dehydrogenation energy,and electronic structure of MgH2on TM(Ti,Ni,Zr,and Nb)@V2C were calculated.The results showed that TM atoms tended to occupy the face-centered cubic sites of V2C.MgH2adsorption on V2C was improved by adding a TM and the order of the adsorption energy was as follows:Ni@V2C>Ti@V2C>Zr@V2C>Nb@V2C>V2C.An orbital hybridization peak between H and TM atoms was observed in the electronic structure of MgH2on TM(Ti,Ni,Zr,and Nb)@V2C.The addition of a TM supported on V2C substantially improved the dehydrogenation energy of(MgH2)4 clusters,and the order of improvement was Ni@V2C>Ti@V2C>Nb@V2C>Zr@V2C.The dehydrogenation energy of(MgH2)4 clusters on Ni@V2C was lower than that of pure(MgH2)4 clusters and(MgH2)4 clusters on V2C,by 1.60 and 1.11 eV,respectively.TM@V2C combinations had significantly enhanced MgH2dehydrogenation,providing theoretical justification for conducting experiments to develop novel high-performance catalysts. 展开更多
关键词 density functional theory V2C MXene adsorption dissociation hydrogen storage
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Metal-free C(CN)3cooperated with Co–Ti dual sites in bimetallic CoTi-MOF as a tandem photocatalyst for highly efficient C2H4production 认领 引用
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作者 Lijun Xiong Dandan Zhu +4 位作者 Chenglong Qiu Weihong Zeng Mingshi Xu Shanshan Wang Yong Yang 《Green Energy & Environment》 SCIE EI CAS CSCD 2026年第4期1135-1145,共11页
The photocatalytic reduction of carbon dioxide(CO2)into high-value C2+hydrocarbons represents a sustainable pathway to alleviate energy shortages and reduce atmospheric CO2levels.In this study,a unique tandem... The photocatalytic reduction of carbon dioxide(CO2)into high-value C2+hydrocarbons represents a sustainable pathway to alleviate energy shortages and reduce atmospheric CO2levels.In this study,a unique tandem photocatalyst(CoTi-CN)is constructed by integrating bimetallic CoTi-MOF with metal-free half-metallic C(CN)3.This composite demonstrates markedly enhanced activity and selectivity in the photocatalytic CO2reduction to ethylene(C2H4),achieving a C2H4selectivity of 36.8%and a generation yield of 31.3μmol g-1over 5 h.Density functional theory(DFT)calculations combined with in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)analysis reveal that C(CN)3acts as an efficient CO2to CO converter,while CoTi-MOF favors the adsorption and C-C coupling of*CO intermediates.The spatially decoupled CO generation and C-C coupling processes lead to optimized intermediate coverage and reduced energy barriers,resulting in superior selectivity toward multi-carbon products.This work opens new horizons for the design of tandem photocatalysts that combine half-metallic catalysts with bimetallic MOFs,achieving a significant enhancement in the activity and selectivity of photocatalytic C2H4production. 展开更多
关键词 Tandem catalyst Bimetallic CoTi-MOF Half-metallic C(CN)3 Photocatalytic CO2reduCtion C-C coupling
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Immunogenetic and molecular biomarkers in COVID-19 and hepatitis C virus infection: Evaluating the diagnostic potential of HLA (rs1131500), IGF-2, and I-FABP 认领 引用
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作者 Amal Ahmed Mohamed Rasha M Abdel-Hamid +10 位作者 Amr Amin Eman Al Hussain A Gawad Salma MohamedSaed Dalia A Gaber Mohamed Ezz Al Arab Waleed El-Agawy Mohammed Zakaria Ali AbuRahma HebaHanafy Elosaily Elsaeed E Shaaban Shaymaa A Ismail Amany A Sakr 《World Journal of Hepatology》 2026年第3期94-111,共18页
BACKGROUND The human leukocyte antigen(HLA)system represents one of the most genetically diverse and densely packed genomic regions,playing a fundamental role in orchestrating immune responses.Among molecular markers ... BACKGROUND The human leukocyte antigen(HLA)system represents one of the most genetically diverse and densely packed genomic regions,playing a fundamental role in orchestrating immune responses.Among molecular markers linked to viral pathogenesis and immune modulation are insulin-like growth factor 2(IGF-2)and intestinal fattyacid-binding protein(I-FABP).AIM To investigate the influence of the HLA variant rs1131500,together with IGF-2 and I-FABP,on susceptibility to hepatitis C virus(HCV),coronavirus disease 2019(COVID-19),and their co-occurrence,to identify predictive biomarkers and potential therapeutic targets.METHODS The study involved quantifying circulating levels of IGF-2,I-FABP,and interferon-gamma(IFN-γ)and genotyping HLA rs1131500 using real-time polymerase chain reaction.Participants provided nasopharyngeal swabs for detection of severe acute respiratory syndrome coronavirus 2 RNA and blood samples for HCV RNA analysis and biomarker assessment.RESULTS Levels of IGF-2 and I-FABP were notably higher in all patient categories,with the highest values observed in coinfected individuals(P<0.0001).A moderate positive correlation was observed between I-FABP and IFN-γin COVID-19 cases(r=0.261,P=0.05).IGF-2 had the most substantial predictive value(odds ratio[OR]:4.5-5.5),while IFN-γshowed a protective trend(OR<1)when combined with IGF-2 and I-FABP.CONCLUSION IGF-2 emerged as the most consistent and reliable biomarker across all patient groups,particularly in COVID-19 and co-infections.I-FABP was a strong marker for co-infection,less so for COVID-19,and ineffective for HCV alone.Genetically,the CC genotype was more common in the HCV and Control groups,whereas the TT genotype was associated with COVID-19 and co-infection,suggesting potential diagnostic value. 展开更多
关键词 COVID-19 Hepatitis C virus Immunogenetics Human leukocyte antigen(rs1131500) Insulin-like growth factor-2 Intestinal fatty-acid-binding protein Biomarkers
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MOF衍生TiO2/C复合材料的制备及其光催化CO2还原性能研究 认领 引用
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作者 黄健勇 纵甜甜 +2 位作者 唐家丽 范劲勇 刘琪 《功能材料》 CAS CSCD 北大核心 2026年第3期107-115,共9页
以MIL-125(Ti)为前驱体,在氩气氛围中煅烧制备了MOF衍生TiO2/C复合材料。该材料成功保留了多孔碳骨架(比表面积为192.14 m2/g),并形成了Ti—O—C界面键(XPS显示C—O峰偏移0.3~0.5 eV)及氧空位(O 1s谱中531.46 eV处存在缺陷峰)。碳骨... 以MIL-125(Ti)为前驱体,在氩气氛围中煅烧制备了MOF衍生TiO2/C复合材料。该材料成功保留了多孔碳骨架(比表面积为192.14 m2/g),并形成了Ti—O—C界面键(XPS显示C—O峰偏移0.3~0.5 eV)及氧空位(O 1s谱中531.46 eV处存在缺陷峰)。碳骨架与氧空位的协同作用使带隙窄化至3.01 eV,显著拓宽了光响应范围;光电测试表明,材料的载流子分离效率得到提升(光电流密度达24.74μA·cm-2,较P25提高40%),电荷转移电阻降低。在光催化CO2还原反应中,该材料的CO产率达434.12μmol/(g·h)(较P25提升12倍),且选择性倾向于CO路径(CH4产率为96.09μmol/(g·h))。机理研究表明锐钛矿/金红石混相异质结驱动电子迁移,Ti—O—C键通过介导电荷转移使碳骨架富集电子活化CO2,氧空位则抑制载流子复合并优化反应路径。三者协同形成"碳骨架-氧空位-Ti—O—C"增效机制,为高效MOF衍生光催化剂设计提供了新范式。 展开更多
关键词 MIL-125(Ti) 衍生TiO2/C 光催化 CO2还原
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Genetic polymorphism of IFI16 and AIM2 among Pakistani hepatitis C virus-induced fibrosis patients 认领 引用
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作者 Iqra Arshad Mashaim Majid +2 位作者 Bisma Rauff Ali Amar Mahmood S Choudhery 《World Journal of Hepatology》 2026年第5期259-272,共14页
BACKGROUND Chronic hepatitis C(CHC)infection remains a significant global health burden often progressing to hepatic fibrosis and cirrhosis,which may ultimately result in hepatocellular carcinoma.Liver fibrosis develo... BACKGROUND Chronic hepatitis C(CHC)infection remains a significant global health burden often progressing to hepatic fibrosis and cirrhosis,which may ultimately result in hepatocellular carcinoma.Liver fibrosis development is governed by complex host-pathogen interaction,including genetic susceptibility and immune dysregulation.IFI16 and AIM2 inflammasomes serve as critical modulators of inflammation and pathogen pathways.AIM To determine the association of variants IFI16(rs1057028)and AIM2(rs2814770)with hepatic fibrosis progression in Pakistani CHC patients.METHODS This study recruited 378 CHC patients from Lahore General Hospital(tertiary care hospital).Study participants were selected based on hepatitis C virus(HCV)-RNA positivity and transient elastography confirmed hepatic fibrosis.A total of 378 CHC patients for IFI16 genetic variant and 140 CHC patients for AIM2 variant were genotyped using amplification refractory mutation system assays.χ2test,ttest,Mann-Whitney U test,combined genotype effect,and logistic regression analysis was performed determine association between target single nucleotide polymorphisms and progression of HCV-related fibrosis and cirrhosis.RESULTS Results of our study showed that only AIM2 rs2841770 variant genotype TT shows significant association with a higher risk of advanced stage of liver fibrosis(OR=4.83,P=0.05).Combined genotype analysis had shown that CHC patients having A allele of rs1057028 and T allele of rs2814770 are significantly associated with increased risk of hepatic fibrosis(OR=2.6,95%CI:1.16-5.86,P=0.022).Our findings also revealed a significant trend of increasing frequency of liver fibrosis with an increased number of risk alleles of IFI16 rs1057028 and AIM2 rs2814770.In univariate regression analysis,body mass index and alanine aminotransferase levels significantly associated with increased risk of liver fibrosis.CONCLUSION This study suggests that AIM2 rs2814770 and its combined effect with IFI16 rs1057028 may be increase susceptibility to hepatic fibrosis in CHC patients,highlighting immunogenetic modulation,warranting further research for predictive biomarkers. 展开更多
关键词 ChroniC hepatitis C IFI16 AIM2 Rs2814770 Rs1057028 Genetic polymorphism Prognostic biomarker Liver fibrosis Cirrhosis Hepatitis C virus
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Hollow tubular In2O3modified carbon nitride for photocatalytic high-yield cleavage of lignin C-C bonds under 395 nm light 认领 引用
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作者 Yixin Li Jianhao Qiu +5 位作者 Guanglu Xia Qiying Liu Biyao Fang Meng Liu Chen Chen Jianfeng Yao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第4期209-218,共10页
The selective cleavage of Cα-Cβbonds is of great significance to lignin valorization,and photocataly-sis offers an eco-friendly pathway to achieve this process.Here,graphitic carbon nitride(g-C3N4)modifi... The selective cleavage of Cα-Cβbonds is of great significance to lignin valorization,and photocataly-sis offers an eco-friendly pathway to achieve this process.Here,graphitic carbon nitride(g-C3N4)modified with hollow tubular In2O3was constructed via the calcination method for the photocatalytic cleavage of lignin Cα-Cβbonds.MIL-68(In)was used as the precursor of In2O3,imparting a unique hollow tubular structure and a relatively large specific surface area.The hollow tubular structure is helpful for light penetration and scattering,as well as rapid migration of the lignin substrate.The Z-scheme g-C3N4/In2O3heterojunction exhibited 92.1% conversion(corresponding benzaldehyde yield:82.4%)of the lignin model compound 2-phenoxy-1-phenylethanol(PP-ol),outperforming pure In2O3and g-C3N4by 40-and 2.3-fold,respectively,under 395 nm light illumination.By varying the illumination wavelength,the conversion and yields of the g-C3N4/In2O3composites were found to follow wavelength-dependent reactivities.Additionally,photogenerated holes are capable of converting PP-ol into benzoic acid,whereas1O2mainly converts PP-ol into benzaldehyde.This work could encourage the application of metal-organic frameworks in biomass conversion and provide insight into photocatalytic lignin valorization. 展开更多
关键词 Lignin C-C bond cleavage Photocatalysis Metal-organic frameworks g-C3N4 In2O3
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Coupling silver dual atoms and nanoparticles on carbon support for efficient electroreduction N2 to ammonia 认领 引用
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作者 Chang Liu Mei Wang +1 位作者 Xiangming Liang Tongbu Lu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第3期135-143,共9页
Electrocatalytic N2 reduction reaction(eNRR)is a green and sustainable approach for producing ammonia.Herein,we synthesized a Ag2-AgNPs@C catalyst by coupling dual-atom Ag sites(Ag2)and Ag nanoparticle(Ag_... Electrocatalytic N2 reduction reaction(eNRR)is a green and sustainable approach for producing ammonia.Herein,we synthesized a Ag2-AgNPs@C catalyst by coupling dual-atom Ag sites(Ag2)and Ag nanoparticle(AgNPs)on the carbon support,which exhibits excellent eNRR performance,with a high NH3 yield rate of 139.9μg h-1 mg-1cat.and an outstanding Faradaic Efficiency of 74.2%,which are superior to those of most reported eNRR catalysts.Density functional thoery calculations and in-situ infrared spectroscopy analysis demonstrate that in Ag2-AgNPs@C catalyst,AgNPs facilitate water dissociation to produce H*intermediate that supplies to adsorbed*N2 on the Ag2 site for promoting the formation of*NNH key intermediate,thus lowering the Gibbs free energy of rate-determining step and substantially enhancing the eNRR performance.This work opens up new avenues for developing efficient electrocatalytic nitrogen reduction catalysts via synergistic effect. 展开更多
关键词 Electrocatalytic N2reduction reaction NH3production Dual-atoms Ag2-AgNPs@C Synergistic effect
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熔盐法制备Mo2C镀层增强金刚石抗压性能机理研究 认领 引用
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作者 毛馨悦 孟庆南 +1 位作者 王思凡 袁牧 《钻探工程》 2026年第4期79-84,共6页
为提升金刚石单颗粒抗压强度,改善孕镶金刚石钻头在硬地层的钻进性能,本文采用熔盐法在金刚石表面制备碳化钼(Mo2C)镀层,通过SEM、XRD进行微观表征,测试单颗粒抗压强度,并利用有限元模拟分析镀层产生的残余热应力及其强化机理。结果... 为提升金刚石单颗粒抗压强度,改善孕镶金刚石钻头在硬地层的钻进性能,本文采用熔盐法在金刚石表面制备碳化钼(Mo2C)镀层,通过SEM、XRD进行微观表征,测试单颗粒抗压强度,并利用有限元模拟分析镀层产生的残余热应力及其强化机理。结果表明:经1323 K保温90 min后,金刚石表面形成连续、致密的Mo2C镀层,平均厚度约2.38μm;镀层后金刚石的单颗粒抗压强度由84 N提高至156 N,增幅达85.71%。有限元模拟显示,降温过程中因Mo2C与金刚石热膨胀系数差异,金刚石内部产生约445.6 MPa的残余压应力,该压应力在外部载荷作用下抵消裂纹尖端的拉应力,抑制裂纹萌生与扩展,从而显著提高抗压性能。本研究揭示了镀层增强金刚石抗压强度的热应力机制,为高性能金刚石钻头的设计与制造提供了理论依据和工程参考。 展开更多
关键词 孕镶金刚石钻头 金刚石 Mo2C镀层 熔盐法 抗压强度 热应力 微观表征 有限元模拟
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Strategical dynamic modulation of turn-on voltage for write transistor introducing charge-trap layer in 2T0C DRAM cell employing IGZO channel 认领 引用
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作者 Kyung Min Kim Sang Han Ko Sung Min Yoon 《Journal of Semiconductors》 EI CAS CSCD 2026年第2期33-43,共11页
The fabrication of a dynamic threshold-2T0C(DT-2T0C) DRAM cell incorporating a ZnO charge-trap layer in the write transistor has been successfully achieved, addressing the negative hold voltage(VHOLD) issue of conv... The fabrication of a dynamic threshold-2T0C(DT-2T0C) DRAM cell incorporating a ZnO charge-trap layer in the write transistor has been successfully achieved, addressing the negative hold voltage(VHOLD) issue of conventional 2T0C DRAM cells using oxide channel layers. The proposed device facilitates dynamic modulation of turn-on voltage(VON) through an additional SET operation, allowing VON to shift above 0 V. The retention time in SET operation was extended to 104 s by optimizing the tunneling layer deposition conditions. The device characterization revealed a significant correlation between VON and both the WRITE speed and the retention properties of the DT-2T0C, verifying the trade-off between WRITE time and retention time. A long retention time over 1000 s was achieved, even under VHOLD of 0 V. 展开更多
关键词 IGZO thin-film transistor(TFT) dynamic random-access memory(DRAM) 2T0C
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CCL2在非小细胞肺癌吉非替尼耐药中的作用及机制 认领 引用 被引量：3
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作者 牛可 钟剑鑫 +2 位作者 唐静 董六一 陈礼文 《中国药理学通报》 CAS CSCD 北大核心 2026年第1期131-137,共7页
目的探讨C-C基序趋化因子配体2(C-C motif chemo-kine ligand 2,CCL2)在非小细胞肺癌(non-small cell lung can-cer,NSCLC)吉非替尼耐药中的作用及其信号通路调控机制。方法以吉非替尼敏感的NSCLC细胞PC9及其耐药株PC9/GR为细胞模型,比... 目的探讨C-C基序趋化因子配体2(C-C motif chemo-kine ligand 2,CCL2)在非小细胞肺癌(non-small cell lung can-cer,NSCLC)吉非替尼耐药中的作用及其信号通路调控机制。方法以吉非替尼敏感的NSCLC细胞PC9及其耐药株PC9/GR为细胞模型,比较两细胞CCL2表达;使用重组人CCL2蛋白(rhCCL2)预处理PC9,或采用siRNA敲减PC9/GR CCL2基因,或CCL2抑制剂Bindarit处理PC9/GR,检测细胞药物敏感性变化;利用基因集富集分析,识别CCL2参与的生物信号通路,在PC9/GR中敲减CCL2并检测相关信号蛋白的表达。结果PC9/GR细胞CCL2 mRNA和蛋白表达均明显高于PC9细胞(P<0.01);rhCCL2预处理后,PC9的药物敏感性明显降低,而si-CCL2或Bindarit处理的PC9/GR对吉非替尼的敏感性明显升高(P<0.01);CCL2明显富集在JAK/STAT、PI3K/AKT和RAS/ERK相关信号通路;抑制CCL2导致PC9/GR细胞中p-AKT、p-ERK、p-STAT3水平明显降低。结论CCL2参与NSCLC吉非替尼耐药,其机制可能与激活PI3K/AKT、JAK/STAT3、RAS/ERK信号通路相关。 展开更多
关键词 非小细胞肺癌 吉非替尼 耐药 C-C基序趋化因子配体2 基因集富集分析 信号通路
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sp2carbon conjugated covalent organic cage with efficient photocatalysis 认领 引用 被引量：1
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作者 Jiajia Li Shan Shiang Hii +2 位作者 Xinyuan Zhu Yanping Yang Youfu Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第3期462-466,共5页
The design and synthesis of fully conjugated covalent organic cages(c COCs)featuring sp2carbon connections pose significant challenges due to the difficulties associated with forming stable C=C bonds.In this study,... The design and synthesis of fully conjugated covalent organic cages(c COCs)featuring sp2carbon connections pose significant challenges due to the difficulties associated with forming stable C=C bonds.In this study,we present a novel anthracene-based c COC linked by C=C bonds,synthesized directly through Knoevenagel condensation.Remarkably,this sp2c COC has shown exceptional performance as an n-type semiconductor,characterized by strong electronic delocalization,an optimized band structure,and extensive light absorption capabilities.It efficiently catalyzes the photodegradation of organic dyes and promotes the photoinduced aerobic oxidation of amines to imines.In comparison to imine-linked c COCs with the same skeleton,the sp2c COC demonstrates distinct advantages as a next-generation photocatalyst,including enhanced chemical stability and superior photocatalytic performance.This research underscores the potential of Knoevenagel condensation in the development of innovative cCOCs,offering valuable insights for their applications in optoelectronic materials and catalysis. 展开更多
关键词 sp2c Conjugation Covalent organic cage Knoevenagel condensation Photocatalysis
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骨疏康颗粒含药血清调节线粒体稳态改善地塞米松诱导的C2C12肌管细胞萎缩 认领 引用 被引量：1
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作者 魏巍 刘洪飞 +6 位作者 戚晓楠 刘彦彤 王德羽 于智同 乔春林 王世轩 滕海 《中国组织工程研究》 CAS 北大核心 2026年第22期5682-5693,共12页
背景:骨疏康颗粒是一种中药复方制剂,临床上常用于治疗骨质疏松症等骨骼相关疾病,但它在调控肌肉代谢中的作用尚不明确。目的:探究骨疏康颗粒含药血清对地塞米松诱导的C2C12肌细胞萎缩的抑制效果。方法:①体内实验:选取3月龄雌性SD大鼠3... 背景:骨疏康颗粒是一种中药复方制剂,临床上常用于治疗骨质疏松症等骨骼相关疾病,但它在调控肌肉代谢中的作用尚不明确。目的:探究骨疏康颗粒含药血清对地塞米松诱导的C2C12肌细胞萎缩的抑制效果。方法:①体内实验:选取3月龄雌性SD大鼠36只,随机分为3组,每组12只,模型组大鼠肌肉注射地塞米松(2.5mg/kg),1次/d,连续给药1周,随后正常饲养3周;骨疏康组大鼠造模后灌胃0.48g/kg骨疏康颗粒混悬液,1次/d,连续3周;空白组未造模,灌胃等量蒸馏水,1次/d,连续4周。末次给药2h后,取左侧大鼠股骨及腓肠肌标本进行苏木精-伊红染色,提取右侧腓肠肌及股骨组织RNA,通过实时荧光定量PCR检测线粒体功能、自噬及炎症相关基因mRNA表达水平。②体外实验:培养C2C12细胞并用体积分数2%马血清诱导其分化为肌管细胞。将分化后的肌管细胞分为对照组、模型组和骨疏康含药血清组。通过4umol/L地塞米松孵育48h构建肌肉萎缩模型,其中骨疏康组在地塞米松处理24h后加入体积分数10%的骨疏康含药血清再干预24h。CCK-8检测细胞活力,流式细胞术检测活性氧水平,透射电镜观察细胞超微结构变化;Westernblot检测线粒体功能相关蛋白、自噬相关蛋白及抗氧化相关蛋白表达水平。结果与结论:①苏木精-伊红染色显示,与模型组相比,骨疏康组大鼠肌肉纤维结构恢复较好;实时荧光定量PCR进一步验证了骨疏康颗粒对线粒体功能和自噬相关基因具有上调作用,支持其通过多靶点机制缓解肌肉萎缩。②流式细胞术和CCK-8结果显示,地塞米松处理后C2C12细胞活性氧水平显著升高(P<0.05),细胞活力显著降低(P<0.05);透射电镜观察发现地塞米松诱导细胞超微结构紊乱,细胞器数量明显减少,线粒体呈现萎缩模糊状态,并伴随大量自噬小体及细胞质空泡的出现;Westernblot结果表明,地塞米松处理后线粒体功能相关蛋白线粒体外膜转位酶20、热休克蛋白60表达显著降低,自噬相关蛋白LC3和Beclin-1异常表达(P<0.05),沉默信息调节因子1表达显著降低(P<0.05),提示地塞米松破坏了线粒体稳态并抑制了自噬功能。经过骨疏康颗粒含药血清处理后,活性氧水平显著降低(P<0.05),细胞活力显著升高(P<0.05);透射电镜观察显示细胞超微结构有所改善,线粒体形态相对恢复;Westernblot结果显示,线粒体外膜转位酶20、热休克蛋白60、沉默信息调节因子1的表达显著上调(P<0.05),LC3和Beclin-1表达恢复至正常水平(P<0.05),表明骨疏康颗粒含药血清在改善线粒体功能、降低氧化应激以及调控自噬方面发挥了积极作用。 展开更多
关键词 C2C12细胞 肌管细胞 地塞米松 骨疏康颗粒 线粒体稳态 含药血清 肌肉减少症 自噬小体
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祛湿活血方调控AMPK/SREBP1c信号通路对HepG2脂肪肝细胞生长的影响 认领 引用 被引量：1
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作者 谭伟强 刘丽 +3 位作者 刘旭东 魏业煌 龚晓倩 王蓉蓉 《实用医学杂志》 CAS 北大核心 2026年第3期406-415,共10页
目的探究祛湿活血方对游离脂肪酸(FFA)诱导的HepG2细胞的作用及机制。方法采用体外细胞实验,利用CCK8法测定不同浓度祛湿活血方对HepG2细胞活性的影响以选定适宜浓度进行后续实验。随后使用250μmol/L棕榈酸钠溶液联合500μmol/L油酸钠... 目的探究祛湿活血方对游离脂肪酸(FFA)诱导的HepG2细胞的作用及机制。方法采用体外细胞实验,利用CCK8法测定不同浓度祛湿活血方对HepG2细胞活性的影响以选定适宜浓度进行后续实验。随后使用250μmol/L棕榈酸钠溶液联合500μmol/L油酸钠的游离脂肪酸处理24 h诱导建立脂肪肝细胞模型,并给予不同浓度祛湿活血方含药血清及AMPK抑制剂对HepG2细胞进行24 h干预。通过油红O染色法和脂质荧光染色法观察细胞内脂滴积聚情况,采用GPO-PAP酶法检测细胞内总胆固醇(TC)和甘油三酯(TG)含量变化,TBA法检测和羟胺法分别检测丙二醛(MDA)和超氧化物歧化酶(SOD)的含量,ELISA检测肿瘤坏死因子-α(TNF-α)和白细胞介素1β(IL-1β)的含量,进一步运用qRT-PCR、Western blot和免疫荧光染色技术检测细胞内脂质代谢相关基因及蛋白的表达。结果祛湿活血方可显著改善FFA诱导的HepG2细胞脂质沉积,氧化应激及炎症反应,显著降低细胞中TC、TG、MDA、TNF-α、IL-1β的含量和提高SOD活性(P<0.01),提高AMPK,降低SREBP1c、FASN、ACC1和SCD1的mRNA表达水平(P<0.05),以及增加p-AMPK/AMPK,降低SREBP1c、FASN、ACC1和SCD1的蛋白表达(P<0.05)。结论祛湿活血方能够显著改善MASLD细胞模型的脂质代谢,并减轻氧化应激及炎症反应,其机制可能与激活AMPK/SREBP1c信号通路有关。 展开更多
关键词 祛湿活血方 代谢功能障碍相关脂肪性肝病 AMPK/SREBP1c信号通路 HepG2细胞
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lncAKR1C2通过调节微小RNA-137对肺腺癌细胞增殖、迁移和免疫逃逸的影响 认领 引用 被引量：1
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作者 方思 郭红荣 +4 位作者 王红娟 徐建群 程津津 周利君 李航 《陕西医学杂志》 CAS 2026年第1期11-16,共6页
目的:探讨长链非编码RNA(lncRNA)lncAKR1C2通过调控微小RNA(miR)-137对肺腺癌细胞增殖、迁移和免疫逃逸的影响。方法:ICGC数据库分析肺腺癌组织中lncAKR1C2的表达水平,实时荧光定量PCR(qRT-PCR)检测肺腺癌细胞系(H1975、H1650、H1299、A... 目的:探讨长链非编码RNA(lncRNA)lncAKR1C2通过调控微小RNA(miR)-137对肺腺癌细胞增殖、迁移和免疫逃逸的影响。方法:ICGC数据库分析肺腺癌组织中lncAKR1C2的表达水平,实时荧光定量PCR(qRT-PCR)检测肺腺癌细胞系(H1975、H1650、H1299、A549)中lncAKR1C2表达水平。以A549细胞为研究对象,分为si-NC组(转染si-NC)和si-lncAKR1C2组(转染si-lncAKR1C2)。MTS法检测各组A549细胞增殖,细胞划痕实验检测A549细胞迁移状况,检测A549细胞对紫杉醇的耐药性。Western blot检测A549细胞中免疫逃逸蛋白程序性死亡配体-1(PD-L1)、细胞毒性T淋巴细胞相关抗原-4(CTLA-4)、B7同源物3(B7-H3)、B7同源物4(B7-H4)表达。双荧光素酶报告基因实验验证lncAKR1C2和miR-137的靶向关系。ICGC数据库分析肺腺癌组织中lncAKR1C2和miR-137表达的相关性。qRT-PCR检测各组A549细胞中miR-137表达水平。结果:与正常肺组织比较,lncAKR1C2在肺腺癌组织中表达显著增加(P<0.01)。与支气管上皮BEAS-2B细胞比较,H1975、H1650、H1299、A549细胞中lncAKR1C2表达显著增加(均P<0.01)。与si-NC组比较,si-lncAKR1C2组A549细胞增殖能力降低(P<0.01),细胞迁移率显著降低(P<0.01),PD-L1、CTLA-4、B7-H3和B7-H4蛋白表达显著下降(均P<0.01)。lncAKR1C2-WT与miR-137存在靶向关系(P<0.01)。肺腺癌组织中lncAKR1C2-WT与miR-137表达呈负相关(P<0.01)。与si-NC组比较,si-lncAKR1C2组A549细胞miR-137表达显著增加(P<0.01)。结论:干扰lncAKR1C2表达可降低A549细胞增殖和迁移能力,并且抑制其免疫逃逸,其分子机制可能通过调控miR-137表达实现。 展开更多
关键词 肺腺癌 长链非编码RNA lncAKR1c2 微小RNA-137 增殖 迁移 免疫逃逸
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北斗三号MEO卫星B1C/B2a信号单系统精密产品性能评估 认领 引用 被引量：1
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作者 王乐 陆文龙 +3 位作者 解世超 冯瑞瑞 张奋 崔博斌 《测绘地理信息》 CSCD 2026年第1期157-166,共10页
本文系统评估了北斗三号(BDS-3)MEO卫星B1C/B2a信号在单系统模式下的精密产品性能,从产品生成与应用两个层面,对比分析了BDS-3 MEO单系统与BDS-3MEO/GPS双系统的表现。结果显示:在定轨模糊度固定方面,BDS-3 MEO单系统的非差宽巷与窄巷... 本文系统评估了北斗三号(BDS-3)MEO卫星B1C/B2a信号在单系统模式下的精密产品性能,从产品生成与应用两个层面,对比分析了BDS-3 MEO单系统与BDS-3MEO/GPS双系统的表现。结果显示:在定轨模糊度固定方面,BDS-3 MEO单系统的非差宽巷与窄巷固定率分别为97.97%和90.28%,接近双系统水平;单系统轨道的1D RMS为51.2 mm,略低于双系统,而钟差拟合残差平均值为0.14 ns,序列平滑性优于双系统;在地球自转参数(ERP)方面,X、Y极坐标的RMS分别为39.2μas和27.8μas,X、Y极坐标速率的RMS分别为230.0μas/d和262.2μas/d,日长变化的RMS为203.2μs/d,部分指标略低于双系统,但整体仍满足精密产品要求;单系统天顶总延迟(ZTD)的平均RMSE为6.7 mm;单系统网解PPP的非差模糊度宽巷固定率超过98%,窄巷平均固定率为83%;静态精密单点定位(PPP)中,单系统收敛时间为27.89 min,E、N、U三个方向的精度分别为1.71 cm、2.34 cm和1.25 cm;在框架一致性比对中,单系统的平均尺度变化为0.065 ppb,优于双系统的0.188 ppb,表明在BDS天线对齐至ITRF 2020后单系统产品框架一致性表现良好。研究证实,BDS-3单系统具备独立生成高精度产品的能力,为北斗系统实现自主运行提供了有力支撑。 展开更多
关键词 北斗三号 MEO B1C/B2a 单系统性能评估
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