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Transparent flexible ZnO/MWCNTs/PBMA ternary nanocomposite film with enhanced mechanical properties

Science China Chemistry 2016年第8期59卷 1010-1017页

作者： Xingwei Han xiaofei zeng Jiexin Wang Dejia Kong N.R. Foster Jianfeng Chen State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing 100029 China Department of Chemical Engineering Columbia University New York 10027 USA Supercritical Fluids Research Group School of Chemical Engineering University of New South Wales Sydney New South Wales 2052 Australia Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology Beijing 100029 China

Functional organic-inorganic nanocomposites with high transparency show significant potential application in many fields. However, it is still a great challenge to prepare flexible transparent nanocomposites due to the intrinsic stiffness of the nanoparticles and the poor interaction between nanopartieles and organic matrices. In this work, a transparent ternary nanocomposite film with enhanced mechanical performance is fabricated by two-steps. First, the transparent ternary ZnO/MWCNTs/n-butyl methacrylate （BMA） nanodispersion is prepared by mixing the ZnO/BMA and MWCNTs/BMA dispersions directly. Then, the ternary nanocoposites film is fabricated via in-situ bulk polymerization of the above nanodispersions. As a result, the tensile strength of the ZnO/MWCNTs/poly-n-butyl methacrylate （PBMA） ternary film is enhanced by 42% and the elongation at break is three times that of ZnO/PBMA nanocomposite. The hardness of the film increases from 5B to 1H with 40 wt% ZnO. These results indicate that ZnO and MWCNTs can improve the mechanical properties of the composite significantly. Importantly, the ternary nanocomposite film still remains high transparency and exhibit excellent UV-shielding performance. The as-prepared transparent multifunctional nanocomposite films have promising applications in optical materials and devices, such as optical filters, contact lenses and protection packing.

关键词： ZnO carbon nanotubes transparent ternary nanocomposite UV-shielding mechanical properties

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Laser-induced layer-by-layer removal and thermo-mechanical action mechanisms of FeCo-based multilayer wave-absorbing coatings

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Journal of Materials Science & Technology 2024年第23期190卷 10-23页

作者： Zhaoru He Shunwen Zheng Yizhou Shen Jie Tao Weibiao Xiong Song Shu xiaofei zeng Shuangshuang Song College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China State-Owned Machinery Factory in Wuhu Wuhu 241007China State-Operated Shijing Machinery Factory Xiangyang 441002China

The excellent performance of laser-induced removal has been widely recognized,yet the limitation of its applications has been gradually approached for complex multilayer coatings in practical ***,it is necessary to clarify the laser-induced removal mechanisms of different material layers,which may contribute to guiding precise and controllable layer-by-layer removal and subsequent ***,the laser-induced layer-by-layer removal of FeCo-based multilayer wave-absorbing coatings was designed and *** macro/micro morphologies and elemental analysis indicated that the removal of the topcoat and wave-absorbing layer was dominated by thermal ***,experiments and simulations demonstrated that a shift in the removal mechanism,i.e.,from the ablation mechanism to the stripping mechanism,occurred when the laser irradiated the *** is mainly attributed to the competing contributions of temperature rise and thermal stress to the removal *** macrodynamic behavior captured by a high-speed camera also validated the combination of both re-moval ***,the evolution of the crystalline phase and element valence state was *** laser-induced breakdown spectroscopy revealed the microscopic material motions dur-ing the layer-by-layer removal,including molecular bond breaking induced by multiphoton absorption,atomic ionization,excitation and compounding of electrons and ions,crystal lattice deformation caused by electron-phonon coupling,*** on the above analysis,the thermo-mechanical action mechanisms and microscopic motion models of laser-induced layer-by-layer removal for FeCo-based multilayer wave-absorbing coatings were established,which is expected to be an ideal method for breaking through the limitation of laser-induced removal’s applications.

关键词： Laser-induced removal Layer-by-layer removal Thermo-mechanical action mechanisms FeCo-based wave-absorbing coatings Macrodynamic removal behavior Microscopic motion models

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Oxygen-Reconstituted Active Species of Single-Atom Cu Catalysts for Oxygen Reduction Reaction

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Research 2020年第1期2020卷 1330-1341页

作者： Liu Yang Haoxiang Xu Huibing Liu xiaofei zeng Daojian Cheng Yan Huang Lirong Zheng Rui Cao Dapeng Cao Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Stanford Synchrotron Radiation Lightsource SLAC National Accelerator LaboratoryMenlo ParkCalifornia 94025USA

Identification of an active center of catalysts under realistic working conditions of oxygen reduction reaction(ORR)still remains a great challenge and ***,we synthesize the Cu single atom embedded on nitrogen-doped graphene-like matrix electrocatalyst(abbreviated as SA-Cu/NG).The results show that SA-Cu/NG possesses a higher ORR capability than 20%Pt/C at alkaline solution while the inferior activity to 20%Pt/C at acidic *** on the experiment and simulation calculation,we identify the atomic structure of Cu-N_(2)C_(2) in SA-Cu/NG and for the first time unravels that the oxygenreconstituted Cu-N_(2)C_(2)-O structure is really the active species of alkaline ORR,while the oxygen reconstitution does not happen at acidic *** finding of oxygen-reconstituted active species of SA-Cu/NG at alkaline media successfully unveils the bottleneck puzzle of why the performance of ORR catalysts at alkaline solution is better than that at acidic media,which provides new physical insight into the development of new ORR catalysts.

关键词： alkaline Oxygen abbreviated

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Overexpressed NEDD8 as a potential therapeutic target in esophageal squamous cell carcinoma

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Cancer Biology & Medicine 2022年第4期19卷 504-517页

作者： Jingrong Xian Shiwen Wang Yanyu Jiang Lihui Li Lili Cai Ping Chen Yue Liu xiaofei zeng Guoan Chen Chen Ding Robert MHoffman Lijun Jia Hu Zhao Yanmei Zhang Department of Laboratory Medicine Huadong Hospital Affiliated to Fudan UniversityShanghai 200040China Cancer Institute Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China Research Center on Aging and Medicine Fudan UniversityShanghai 200040China Shanghai Key Laboratory of Clinical Geriatric Medicine Shanghai 200040China Department of Basic Science of Oncology College of Basic Medical SciencesZhengzhou UniversityCollaborative Innovation Center of Henan Province for Cancer ChemopreventionZhengzhou 450001China School of Medicine Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Genetic Engineering Human Phenome InstituteInstitutes of Biomedical SciencesSchool of Life SciencesZhongshan HospitalFudan UniversityShanghai 200032China State Key Laboratory of Cell Differentiation and Regulation Henan International Joint Laboratory of Pulmonary FibrosisHenan Center for Outstanding Overseas Scientists of Pulmonary FibrosisCollege of Life ScienceInstitute of Biomedical ScienceHenan Normal UniversityXinxiang 453007China Department of Surgery University of CaliforniaSan Diego 92101USA Anticancer Inc. San Diego 92101USA

Objective:The hyperactivated neddylation pathway plays an important role in tumorigenesis and is emerging as a promising anticancer *** aimed to study whether NEDD8(neural precursor cell expressed,developmentally down-regulated 8)might serve as a therapeutic target in esophageal squamous cell carcinoma(ESCC).Methods:The clinical relevance of NEDD8 expression was evaluated by using The Cancer Genome Atlas(TCGA)database and tissue ***8-knockdown ESCC cells generated with the CRISPR/Cas9 system were used to explore the anticancer effects and *** proteomic analysis was used to examine the variations in NEDD8 knockdown-induced biological *** cell cycle and apoptosis were assessed with fluorescence activated cell sorting.A subcutaneous-transplantation mouse tumor model was established to investigate the anticancer potential of NEDD8 silencing in ***:NEDD8 was upregulated at both the mRNA and protein expression levels in ESCC,and NEDD8 overexpression was associated with poorer overall patient survival(mRNA level:P=0.028,protein level:P=0.026,log-rank test).Downregulation of NEDD8 significantly suppressed tumor growth both in vitro and in *** proteomic analysis revealed that downregulation of NEDD8 induced cell cycle arrest,DNA damage,and apoptosis in ESCC *** studies demonstrated that NEDD8 knockdown led to the accumulation of cullin-RING E3 ubiquitin ligases(CRLs)substrates through inactivation of CRLs,thus suppressing the malignant phenotype by inducing cell cycle arrest and apoptosis in *** experiments demonstrated that the induction of apoptosis after NEDD8 silencing was attenuated by DR5 ***:Our study elucidated the anti-ESCC effects and underlying mechanisms of NEDD8 knockdown,and validated NEDD8 as a potential target for ESCC therapy.

关键词： NEDD8 esophageal squamous cell carcinoma cullin-RING E3 ubiquitin ligases apoptosis anticancer target

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改进力密度法在悬索结构找形中的应用

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工业建筑 2006年第2期36卷 72-74页

作者：曾小飞叶继红东南大学土木工程学院南京210018

结合工程需要对普通力密度法进行了改进,给出了在给定控制条件下悬索结构的力密度找形迭代公式和迭代策略,形式简单明了。通过对若干典型工程算例的找形计算表明,改进的算法具有收敛精度高,计算能力强,适用范围广等优点,是一种很好的悬... 详细信息

结合工程需要对普通力密度法进行了改进,给出了在给定控制条件下悬索结构的力密度找形迭代公式和迭代策略,形式简单明了。通过对若干典型工程算例的找形计算表明,改进的算法具有收敛精度高,计算能力强,适用范围广等优点,是一种很好的悬索结构成形算法。

关键词：改进力密度法悬索结构找形分析

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Practical approach for detecting k-nonseparability of multipartite quantum states

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 28-44页

作者： Jie Guo Jinchuan Hou xiaofei Qi Kan He College of Mathematics Taiyuan University of TechnologyTaiyuan 030006China School of Mathematics and Statistics Shanxi UniversityTaiyuan 030006China Key Laboratory of Complex Systems and Data Science of Ministry of Education Shanxi UniversityTaiyuan 030006China

The instantaneous detection of entanglement in quantum states poses a significant challenge in the fields of quantum computation and quantum information,and there are no practical methods or tools to complete this task satisfactorily so *** propose a sufficient and necessary criterion of k-nonseparability for any n-partite finite or infinite dimensional systems,2≤k≤*** criterion serves as the foundation for a practical scheme designed to detect entanglement and k-nonseparability across multipar-tite finite-dimensional *** exemplify the application of our scheme,we have developed a software tool that facilitates swift and precise identification of entanglement,k-nonseparability,and genuine entanglement within n-qubit systems,specifically tailored for systems with 2≤n≤4.

关键词： multipartite systems entanglement states entanglement witnesses k-nonseparability

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Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： Mei Zhang Wenhao Li Yangfei Chen Yang Jiang xiaofei Guo Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation

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多壁碳纳米管的表面改性及其在水性聚氨酯体系中的应用

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化学反应工程与工艺 2012年第3期28卷 244-250页

作者：高翠曾晓飞陈建峰北京化工大学有机无机复合材料国家重点实验室北京100029

采用自制的硅烷类改性剂(s-PEG)对经过酸氧化的多壁碳纳米管(MWNTs)进行表面改性处理,并通过共混法制备了MWNTs/水性聚氨酯(WPU)复合材料,研究了MWNTs的添加对复合材料性能的影响。结果表明,改性剂s-PEG成功地包覆于MWNTs表面,形成了s-... 详细信息

采用自制的硅烷类改性剂(s-PEG)对经过酸氧化的多壁碳纳米管(MWNTs)进行表面改性处理,并通过共混法制备了MWNTs/水性聚氨酯(WPU)复合材料,研究了MWNTs的添加对复合材料性能的影响。结果表明,改性剂s-PEG成功地包覆于MWNTs表面,形成了s-PEG壳层,包覆率约为25%。改性MWNTs(s-PEG-MWNTs)的添加可以明显改善WPU复合材料的拉伸性能,当s-PEG-MWNTs的添加量为1%时,复合材料的拉伸强度和断裂伸长率比未添加MWNTs的材料分别提高了597%和152%。s-PEG-MWNTs在WPU基体中达到了良好的分散效果。此外,s-PEG-MWNTs的添加显著地增强了复合材料的导电性能。

关键词：多壁碳纳米管表面改性水性聚氨酯复合材料

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Ultrasonic humidifier aerosols:Observed high heavy metal enrichment and a new emission control method

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Journal of Environmental Sciences 2025年第2期148卷 298-305页

作者： Tao Zhang Xiaohui Lu Ruoyu Zhang Xinghua Jiang Shanye Yang Xiewen Ma Qianqian Gao xiaofei Wang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Ultrasonic humidifiers are commonly used in households to maintain indoor humidity and generate a large number of droplets or spray ***,there have been various health concerns associated with humidifier use,largely due to aerosols generated during ***,we investigated the size distribution,chemical composition,and charged fraction of aerosol particles emitted from commercial ultrasonic *** metals in water used for humidifiers were found to be highly enriched in the ultrasonic humidifier aerosols(UHA),with the enrichment factors ranging from 102 to *** enrichment may pose health concerns for the building occupants,as UHA concentrations of up to 106 particles/cm^(3) or 3 mg/m^(3) were ***,approximately 90%of UHA were observed to be electrically charged,for the first time according to our *** on this discovery,we proposed and tested a newmethod to remove UHA by using a simple electrical *** designed electrical field in this work can efficiently remove 81.4%of ***,applying this electrical field could be an effective method to significantly reduce the health risks by UHA.

关键词： Ultrasonic humidifier aerosols Water-to-Air transfer Heavy metal Enrichment factor Electrical field

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可及时确定受攻击节点的无线传感器网络数据聚合方案

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计算机应用 2016年第9期36卷 2432-2437页

作者：王洁卢建朱曾小飞暨南大学信息科学技术学院广州510632

无线传感器网络(WSN)中,当传感器节点受到攻击导致网络数据和传输受到干扰,及时确定受攻击的传感器节点并采取相应措施以保障整个网络的安全性尤为重要。因此,提出一种可及时确定受攻击节点的无线传感器网络数据聚合方案。首先使用状态... 详细信息

无线传感器网络(WSN)中,当传感器节点受到攻击导致网络数据和传输受到干扰,及时确定受攻击的传感器节点并采取相应措施以保障整个网络的安全性尤为重要。因此,提出一种可及时确定受攻击节点的无线传感器网络数据聚合方案。首先使用状态公钥加密和对称公钥加密结合伪随机函数和消息认证码对数据进行两次加密;其次,在簇头节点进行认证,将假数据过滤后,解密,并将假数据节点编号发送给基站;最后在基站进行解密认证,恢复明文数据。该方案的提出解决了由于受攻击节点导致的错误聚合值问题,而且还实现了及时过滤假数据并确认受攻击的传感器节点。理论分析表明,提出的基于安全的单向函数、消息认证码和椭圆曲线上的离散对数难问题的方案是安全的,并大大降低了网络的通信成本和计算成本。仿真实验表明,该方案的计算成本、通信成本和确认受攻击节点时间比使用状态公钥加密的无线传感器网络安全聚合方案分别降低了至少19.96%、36.81%和28.10%。

关键词：无线传感器网络数据聚合消息认证码伪随机函数同态加密

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