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Journal of Materials Science & Technology 2022年第16期111卷 111-119页

作者： Bohong Zhang Jie Chen pengfei Wang Bingtao sun Yu Cao College of Mechanical&Electrical Engineering Wenzhou UniversityWenzhou 325035China

The inverse gradient-grained CoCrFeMnNi high-entropy alloy with a desirable mechanical property that evades the strength-ductility trade-off is fabricated by the process of cold rolling and subsequent laser surface *** to the gradually decayed thermal effect along with the thickness,the grain size increases from the hard core to the soft surface in terms of the inverse gradient-grained sample,which is in good consistent with the microhardness *** hetero-deformation induced strengthening and strain hardening caused by the inverse gradient-grained structure improve the strength-ductility combination,as well as the high-order hierarchal nanotwins due to the enhanced interaction with *** the laser surface heat-treatment technique,the strength and ductility are significantly increased by enlarging the microhardness difference and decreasing the thermal *** the high volume fraction of gradient-grained layer and a great deal of high-order hierarchal nanotwins in the central region,the laser surface heat-treatment technique is a promising way to produce the gradientstructured materials without thickness limitation.

关键词： High-entropy alloy Laser surface heat-treatment Cold rolling Inverse gradient-grained structure Strength-ductility combination

Highly selective detection of copper(Ⅱ) by a “ligand-free” conjugated copolymer in nucleophilic solvents

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Frontiers of Chemical Science and Engineering 2020年第1期14卷 105-111页

作者： Weixing Deng pengfei sun Quli Fan Lei Zhang Tsuyoshi Minami Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts&TelecommunicationsNanjing 210023China Institute of Industrial Science The University of TokyoMeguro-kuTokyo 153-8505Japan

The synthesis of N-cyclohexyl carbamate-attached fluorene-alt-phenylene copolymer(PFPNCC)and the use of PFPNCC as a“ligand-free”fluorescent chemosensor for Cu(Ⅱ)are *** of Cu(Ⅱ)can efficiently quench the fluorescence of PFPNCC in nucleophilic solvents such as DMF and DMSO,but not in low nucleophilic solvents such as 1,4-dioxane and ***-visible spectra of the mixture of the conjugated polymer and Cu(Ⅱ)indicate the presence of a reduced Cu(Ⅰ)ion in the ***,fluorescence recovery of PFPNCC observed at low temperature suggests that the quenching and reducing mechanism is most probably due to a photo-induced electron transfer from excited PFPNCC to Cu(Ⅱ).Our findings provide a novel strategy for highly selective conjugated polymer-based chemosensors for various target analytes,albeit“ligand-free”.

关键词： ligand-free fluorescent chemosensor copper photo-induced electron transfer

Modified Layer-Removal Method for Measurement of Residual Stress in Pre-stretched Aluminium Alloy Plate

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Journal of Harbin Institute of Technology(New Series) 2015年第2期22卷 34-40页

作者： Liangbao Liu Jianfei sun Wuyi Chen pengfei sun School of Mechanical Engineering and Automation Beihang University

Residual stress is one of the factors affecting the machining deformation of monolithic structure parts in the aviation industry. Thus, the studies on machining deformation rules induced by residual stresses largely depend on correctly and efficiently measuring the residual stresses of workpieccs. A modified layer-removal method is proposed to measure residual stress by analysing the characteristics of a traditional, layer-removal method. The coefficients of strain release are then deduced according to the simulation results using the finite element method （FEM）. Moreover, the residual stress in a 7075T651 aluminium alloy plate is measured using the proposed method, and the results are then analyzed and compared with the data obtained by the traditional methods. The analysis indicates that the modified layer-removal method is effective and practical for measuring the residual stress distribution in pre-stretched aluminium alloy plates.

关键词： pre-stretched aluminium alloy plate residual stress finite dement method(FEM) modified layer-removal

Kinetic analysis and bacterium metabolization of α-pinene by a novel identified Pseudomonas ***

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Journal of Environmental Sciences 2012年第10期24卷 1806-1815页

作者： Zhuowei Cheng pengfei sun Yifeng Jiang Lili Zhang Jianmeng Chen Engineering Research Center of the Ministry of Education for Bioconversion and Biopurificationm Zhejiang University of Technology Hangzhou 310032 China. College of Biological and Environmental Engineering Zhejiang University of Technology Hangzhou 310032 China

Biodegradation has become a popular alternative remediation technology for its economic and ecological advantages. An aerobic bacterium （strain ZW） capable of degrading α-pinene was isolated from a biofilter by a selective enrichment. Based on the 16S rRNA gene analysis and physiochemical properties, this strain was identified as Pseudomonas veronii. Under the optimized condition achieved by the response surface methodology （RSM）, as well as pH 6.82, temperature 26.3℃ and NaC1 concentration 1.36%, almost 100% α-pinene could be removed within 45 hr. Enzymatic biodegradation by the crude intracellular enzyme could be described well by the Michaelis-Menten model in which the maximum degradation rate Vraax and the half-saturation constant Km were calculated to be 0.431 mmol/（***） and 0.169 mmol/L, respectively. Activity assay of catechol suggested that the strain ZW possessed a catechol- 1,2-dioxygenase and could decompose benzene-ring through ortho ring cleavage. Based on the identified intermediates by GC/MS, a new metabolic pathway was proposed, in which the final metabolites were some simpler organic and inorganic compounds. The present work demonstrated that the strain ZW would have a great application prospect for the remediation of α-pinene-contaminated environment.

关键词： Pseudomonas veronii ct-pinene growth conditions kinetics analysis metabolic pathway

基于磁控溅射改善陶瓷涂层断裂韧性的研究进展

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涂料工业 2024年第8期54卷 76-81页

作者：高正源李昱志翟帅汪松林孙鹏飞重庆交通大学机电与车辆工程学院重庆400074 中国科学院上海应用物理研究所上海201800

陶瓷涂层因其优异的耐磨、隔热等性能,被应用于各工程领域,但其断裂韧性差、质脆的特点严重限制了其推广应用。为了改善陶瓷涂层质脆的缺陷,研究人员采用了多种方法对其进行增韧改性,文中论述了陶瓷涂层的增韧方法以及对应机制,综述了... 详细信息

陶瓷涂层因其优异的耐磨、隔热等性能,被应用于各工程领域,但其断裂韧性差、质脆的特点严重限制了其推广应用。为了改善陶瓷涂层质脆的缺陷,研究人员采用了多种方法对其进行增韧改性,文中论述了陶瓷涂层的增韧方法以及对应机制,综述了磁控溅射原理以及调控其工艺参数、掺杂其他元素等方法对陶瓷涂层结构、应力、晶界等的影响。总结了目前陶瓷涂层断裂韧性与硬度不可兼得、增韧机制受涂层尺寸影响等研究难点,并从磁控溅射工艺参数、多种工艺和增韧机制协同增韧等方面对提高陶瓷涂层断裂韧性进行了展望。

关键词：陶瓷涂层磁控溅射断裂韧性增韧机制

Improvement in the liquid zinc corrosion resistance of high Nb-TiAl alloys by pre-oxidation in a SiO_2-powder pack

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Science China(Technological Sciences) 2012年第2期55卷 505-509页

作者： sun pengfei ZHANG LaiQi ZHANG Li LIN JunPin State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The influence of pre-oxidation on the liquid zinc corrosion resistance of high Nb-TiAl alloys was investigated. The pre-oxidation was performed by heating the specimens, buried in silica powder and encapsulated in a silica tube under a vacuum of 1.3x10-5 Pa at 950℃ for 12 h. Experimental results showed that the preoxidized sample exhibited much higher liquid zinc corrosion resistance than that for the comparative samples. This excellent liquid zinc corrosion resistance was attributed to the formation of high-quality oxide scale during peroxidation. The corrosion of all the samples in liquid zinc was caused by a localized breakdown in the oxide scales. The continuous and dense oxide scale formed during preoxidation substantially may prevent the liquid zinc from diffusing to the substrate, and its good continuity may also reduce the possibility of localized breakdown in the oxide scale.

关键词： liquid zinc corrosion preoxidation TiAI-Nb intermetallic compound

Effects of Silver Nanoparticles on Denitrification and Associated N_(2)O Release in Estuarine and Marine Sediments

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Journal of Ocean University of China 2022年第1期21卷 131-140页

作者： sun pengfei LI Kuiran YI Shaokui LI Hui CHEN Xi Fourth Institute of Oceanography Ministry of Natural ResourcesBeihai 536000China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China College of Marine Life Science Ocean University of ChinaQingdao 266003China College of Life Sciences Huzhou UniversityHuzhou 313000China

Silver nanoparticles(AgNPs)have been widely used in medicine and consumer *** it enters the river in dif-ferent ways,then finally converges to the ocean through the *** polution can affect NO_(2)−and N_(2)O production by denitri-fiers in aquatic *** effects of AgNPs on denitrification activity,nitrogen transformation and nitrous oxide(N_(2)O)emission were investigated in Dagu River Estuary(DRE)and Jiaozhou Bay(JZB).The results showed that the potential denitrification activity(PDA),NO_(3)−and NO_(2)−reduction rates decreased with an increase of AgNPs concentration in DRE and ***,the N_(2)O ac-cumulation was significantly increased at AgNPs concentrations above 5 mg kg^(−1)in both areas,and the accumulation rate was greater in estuary than in bay(P0.05)in DRE and ***,the relative abundance of narG,nirS and nosZ gene in two areas decreased with the increase of AgNPs concentration,and the negative effect of AgNPs varied in order:nosZ>nirS>narG,inferring that the expression of denitrifying related genes could be significantly and differently inhibited by AgNPs ***,this study demon-strated that the inhibitory effect of AgNPs on different denitrification process,which may lead to the increase of inorganic nitrogen accumulation and N_(2)O *** study provides a scientific basis for the further studies of AgNPs on the ecological impact mechanism and environmental effects of offshore sedimentary environment.

关键词： nitrous oxide silver nanoparticles denitrification estuarine and marine sediments

NIR-Ⅱprobe modified by poly(L-lysine)with efficient ovalbumin delivery for dendritic cell tracking

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Science China Chemistry 2020年第9期63卷 1272-1280页

作者： Chao Wang Bo sun Hui Bao Tao Wang Wenjuan Xu pengfei sun Quli Fan Wei Huang Key Laboratory for Organic Electronics and Information Displays&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts&TelecommunicationsNanjing 210023China Frontiers Science Center for Flexible Electronics&Shaanxi Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710072China

Dendritic cell(DC)vaccine is an effective strategy for cancer immunotherapy by carrying antigen into DCs and migrating these DCs to drain lymph nodes after *** this article,second near-infrared window(NIR-II)fluorescent nanoparticles have been used to uptake antigen and activate ***(OVA),an antigen for immunization,can be loaded on the surface of these NIR-II fluorescent nanoparticles via electrostatic interaction by virtue of their functionalized poly(L-lysine)(PLL),which exhibits biocompatibility and strong selective interaction with *** addition,these antigen-loaded complexes can efficiently be engulfed by immature DCs to induce DC maturation and cytokine *** subcutaneous injection,highly sensitive NIR-II fluorescence signal from nanoparticles indicates that nanoparticle-labeled DCs can successfully migrate into lymph nodes in vivo,showing great promise in immunotherapy against cancer.

关键词： poly(L-lysine) DC vaccine NIR-Ⅱfluorescence tracking

普通硅酸盐水泥对负温碱激发矿渣砂浆力学性能的影响

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混凝土 2024年第6期 198-201,214页

作者：鞠成汪雨萱孙鹏飞李国晶王涛赵化启佳木斯大学材料科学与工程学院黑龙江佳木斯154007 佳木斯大学信息电子技术学院黑龙江佳木斯154007

碱激发矿渣(AAS)在0℃下能持续水化,具有应用于冬季施工的潜力。为了进一步提升AAS砂浆作为寒冷修补材料的力学性能,掺入了5%、10%、15%和20%的普通硅酸盐水泥(OPC)作为AAS中粒化高炉矿渣(GGBS)的部分替代物。结果表明:在-10℃条件下,OP... 详细信息

碱激发矿渣(AAS)在0℃下能持续水化,具有应用于冬季施工的潜力。为了进一步提升AAS砂浆作为寒冷修补材料的力学性能,掺入了5%、10%、15%和20%的普通硅酸盐水泥(OPC)作为AAS中粒化高炉矿渣(GGBS)的部分替代物。结果表明:在-10℃条件下,OPC含量为15%时,1 d龄期的抗压强度和抗折强度分别提高了31.3%和25.18%,28 d龄期的抗压强度和抗折强度分别提高了4.5%和7.2%。此外,对样品的水化热、生成产物和微观结构进行了对比分析。结果显示,在AAS中加入OPC可以提高水化热,增加C(-A)-S-H的生成率,优化微观结构。

关键词：碱激发矿渣冬季施工水泥力学强度

半导体发光聚合物设计与制备实验虚拟仿真系统开发及应用

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实验室研究与探索 2024年第6期43卷 84-87,146页

作者：孙鹏飞沈清明王义成李美星钱妍南京邮电大学材料科学与工程学院南京210023 南京邮电大学实验室建设与管理处南京210023

半导体发光聚合物被广泛应用于有机电致发光器件和生物荧光成像探针等领域,发光聚合物的制备条件苛刻、成本相对较高,实验操作对于本科生难度较大。开发虚拟仿真系统对实验室场景、实验设备、测试仪器和操作环节等进行仿真,能降低实验... 详细信息

半导体发光聚合物被广泛应用于有机电致发光器件和生物荧光成像探针等领域,发光聚合物的制备条件苛刻、成本相对较高,实验操作对于本科生难度较大。开发虚拟仿真系统对实验室场景、实验设备、测试仪器和操作环节等进行仿真,能降低实验风险和实验成本。仿真系统对实验的重点和难点设置独立操作环节,有利于学生进行重点训练。仿真系统中设置了聚合物结构调控,增强学生对聚合物结构与发光性能构效关系的理解。该仿真实验有助于提升学生的动手和创新能力,有效培养学生自主设计开发新型发光聚合物和解决复杂工程问题的能力。

关键词：半导体发光聚合物虚拟仿真设计开发创新能力复杂工程问题