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Particuology 2015年第2期13卷 99-106页

作者： Cen Yin Anhou Xu Li Gong Luqing zhang Bing Geng Shuxiang zhang Shandong Key Laboratory of Fluorine Chemistry and Chemical Materials School of Chemistry and Chemical Engineering University of Jinan Shandong Engineering Research Center for Fluorinated Material

Slightly crosslinked monodisperse poly（maleic anhydride-cyclohexyl vinyl ether-divinylbenzene）（MA-CHVE-DVB） microspheres were prepared via precipitation polymerization while using 2,2- azobisisobutyronitrile as an initiator in a mixture of methyl ethyl ketone and n-heptane without any stabilizer. The number-average diameter of the resultant poly（MA-CHVE-DVB） microspheres ranged from 0.478 to 1.386 μm with a polydispersity index of 1.00 to 1.02 that depended on the feed ratios of the MA/CHVE/DVB monomers. The introduction of one electron donor monomer cyclohexyl vinyl ether strongly affected the yield, size, and morphology of these slightly crosslinked microspheres. Quinoline- type chelating resins were obtained after combining the poly（MA-CHVE-DVB） with 8-hydroxyquinoline; the adsorption properties of these materials were measured through their ability to remove Cu^2＋ ions from water. The poly（MA-CHVE-DVB） microspheres with low degrees of crosslinking provided more effective functional groups and therefore better ion removal capabilities. These slightly crosslinked microspheres may have applications in water treatment as well as in sensing and drug delivery.

关键词： Precipitation polymerization Crosslinked functional microspheres Cyclohexyl vinyl ether Maleic anhydride Divinylbenzene

Terpyridine-Grafted Nitrogen-Terminal Endowing Cyanine with Metal-Ion-Regulated Photophysical Properties for Cancer Theranostics

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Research 2023年第4期2023卷 117-130页

作者： Junfei Zhu Gang He Peng-Hang Chen Yajie zhang Yafei zhang Shan Lei Yu zhang Meng Li Peng Huang Jing Lin Marshall Laboratory of Biomedical Engineering International Cancer CenterLaboratory of Evolutionary Theranostics(LET)Guangdong Key Laboratory for Biomedical Measurements and Ultrasound ImagingSchool of Biomedical EngineeringShenzhen University Medical SchoolShenzhen 518060China

Heptamethine cyanines(Cy7)are one of the most important dyes in bioimaging and phototherapy,but they often suffer from poor photostability or limited photothermal conversion ***,a facile molecular engineering approach to regulating the photophysical properties of Cy7 by metal ions is *** innovatively modifying the nitrogen with functional groups,a novel terpyridine-grafted nitrogen-terminated Cy7 scaffold(denoted as CydtPy)was synthesized and exhibited tunable photophysical properties when chelating with various metal ions(Mn^(2+),Fe^(2+),etc.).In comparison with metal-ion-free PEGylated CydtPy(LET-11),Mn^(2+)-chelated LET-11(namely,LET-11-Mn)exhibited the increased fluorescence emission intensity,and Fe^(2+)-chelated LET-11(namely,LET-11-Fe)showed the enhanced photostability with~2-fold increase in photothermal conversion *** simply switching the chelated metal ion species,LET-11-Mn or LET-11-Fe could be used for near-infrared fluorescence imaging,magnetic resonance imaging,or photoacoustic ***,LET-11-Fe displayed superior synergistic efficacy of photothermal therapy and chemodynamic therapy both in vitro and in *** work not only provides a new strategy for regulating the photophysical properties of cyanine dyes but also establishes a versatile nanoplatform for cancer theranostics.

关键词： versatile terminated cyanine

Additive manufacturing of multi-morphology graded titanium scaffolds for bone implant applications

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Journal of Materials Science & Technology 2023年第8期139卷 47-58页

作者： Aihua Yu Ce zhang Wei Xu Yun zhang Shiwei Tian Bowen Liu Jiazhen zhang Anrui He Bo Su Xin Lu Shunde Graduate School of University of Science and Technology Beijing Foshan 528399China National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China National Engineering Technology Research Center of Flat Rolling Equipment Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China Bristol Dental School University of BristolBristol BS12LYUK

Porous Titanium scaffolds have attracted widespread attention as bone implants for avoiding the stress shielding effect and promoting *** this study,multi-morphology graded scaffolds hy-bridized by Primitive and Gyroid structures with porosity of 50,60,and 70%were designed(denoted as PG50,PG60,and PG70,respectively)and fabricated by selective laser *** simulation results showed that the maximum von-Mises stress of hybridized scaffolds increased from 504.22 to 884.24 MPa with *** permeability and average pore size of multi-morphology PG50,PG60,and PG70 were in the range of 3.58×10^(-9)-5.50×10^(-9) m^(2) and 568.1-758.4μm,*** microstructure of multi-morphology graded scaffolds consisted of a fully martensiticα′*** permeabilities of PG50 and PG60 were 3.27×10^(-9) and 4.35×10^(-9) m^(2),respectively,which were within the range of human bone(0.01-12.1×10^(-9) m^(2)).Elastic modulus and compressive yield strength of PG50 and PG60 ranged within 5.93^(-9).86 and 180.06-257.08 MPa,***,the PG50 not only exhibited a similar elastic modulus compared to human cortical bone(10.1 GPa)but also had higher strength(257.08 vs 131 MPa).The results of in vitro biocompatibility assay showed that PG50 and PG60 have better cyto-compatibility than mono-morphology scaffolds with the same *** together,PG50 is promising to be used for the restoration of bone defects due to its excellent mechanical properties,appropriate per-meability,and good cytocompatibility.

关键词： Bone implants Multi-morphology graded titanium scaffolds Finite element analysis Selective laser melting Cytocompatibility

A quasi-solid-state electrolyte with high ionic conductivity for stable lithium-ion batteries

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Science China(Technological Sciences) 2022年第10期65卷 2369-2379页

作者： zhang WenJing LI SenLin zhang YuRong WANG XingHui LIU JingDong ZHENG YuanHui College of Chemistry Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated MaterialsFuzhou UniversityFuzhou 350108China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

The practical applications of solid-state electrolytes in lithium-ion batteries(LIBs)are hindered by their low ionic conductivity and high interfacial ***,an ethoxylated trimethylolpropane triacrylate based quasi-solid-state electrolyte(ETPTAQSSE)with a three-dimensional(3D)network is prepared by a one-step in-situ photopolymerization *** 3D network is designed to overcome the contradiction between the plasticizer-related ionic conductivity and the thickness-dependent mechanical property of quasi-solid-state *** ETPTA-QSSE achieves superb room-temperature ionic conductivity up to 4.55×10^(−3)S cm^(−1),a high lithium ion transference number of 0.57,along with a wide electrochemical window of 5.3 V(***+/Li),which outperforms most ever of the reported solid-state *** to the robust network structure and the cathodeelectrolyte integrated electrode design,Li metal symmetrical cells show reduced interface resistance and reinforced electrode/electrolyte interface *** applying the ETPTA-QSSE in LiFePO_(4)||Li cells,the quasi-solid-state cell demonstrates an enhanced initial discharge capacity(155.5 mAh g^(−1)at 0.2 C)accompanied by a high average Coulombic efficiency of greater than 99.3%,offering capacity retention of 92%after 200 ***,this work sheds light on the strategy of enhancing ionic conductivity and reducing interfacial resistance of quasi-solid-state electrolytes,which is promising for high-voltage LIBs.

关键词： quasi-solid-state electrolyte ionic conductivity electrochemical window photopolymerization lithium-ion batteries

Self-cleaning SERS sensor based on flexible Ni_(3)S_(2)/MoS_(2)@Ag@PDMS composites for label-free multiplex volatile organic compounds detection

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Nano Research 2024年第6期17卷 5529-5539页

作者： Xinyue Song Yongzheng zhang Xiaohui Ren Dongyan Tang Xuelin zhang Xin Li MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringState Key Lab of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbin 150090China College of Textile and Clothing Yancheng Institute of TechnologyYancheng 224051China MEMS Center Harbin Institute of TechnologyHarbin 150001China

Flexible self-cleaning surface-enhanced Raman scattering(SERS)sensors are highly desirable for the detection of various environmental pollutants,including volatile organic compounds(VOCs).However,achieving sensitive detection without labeling and ensuring efficient cyclic use remain significant ***,we introduce a direct approach to create a versatile Ni_(3)S_(2)/MoS_(2)@Ag@PDMS(PDMS=polydimethylsiloxane)composite SERS substrate using chemical vapor deposition *** produced substrate shows outstanding performance,offering extremely low detection sensitivity(1.0×10^(−12)M 4-aminobenzenethiol)and high enhancement factors(approximately 107).The interactions between the rod-shaped Ni_(3)S_(2)/MoS_(2)@Ag heterostructure and the molecules facilitate the transfer of charge,resulting in an increased electric field enhancement of the exciton *** has the dual benefit of providing a self-cleaning effect and enhancing SERS ***,the substrate enables sensitive detection of VOCs gas molecules without the need for labels,achieving a minimum detectable concentration as low as 1 ppm for o-dichlorobenzene,due to the preconcentration effect of *** calculations further explain the combined effect of electromagnetic and chemical enhancement in this composite *** utilizing the developed visual SERS barcode,quick multiple detection and analysis of mixtures can be *** flexible and versatile SERS technique has significant potential for on-site detection and analysis of environmental pollutants,opening the doors for the development of a wearable in-situ SERS sensing platform.

关键词： surface-enhanced Raman scattering(SERS) quantitative detection recyclable detection volatile organic compounds(VOCs) chemical vapor deposition(CVD)

Dual strategy of modulating growth temperature and inserting ultrathin barrier to enhance the wave function overlap in type-Ⅱ superlattices

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Nano Research 2022年第6期15卷 5626-5632页

作者： Yuyang Wu Yahui zhang Yi zhang Yunhao Zhao Yu zhang Yingqiang Xu Chongyun Liang Zhichuan Niu Yi Shi Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China National Laboratory of Solid-State Microstructures School of Electronic Science and Engineering and CollaborativeInnovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Joint-Research Center for Computational Materials Zhejiang LaboratoryHangzhou 311100China

Maximizing wave function overlap(WFO)within type-II superlattices(T2SL)is demonstrated to be important for improving their photoelectric properties,such as optical transition strength and quantum efficiency,which,however,remains a great challenge for ***,the dual strategy of modulating growth temperature and inserting ultrathin AlAs barrier into the AlSb layers is presented to enhance the WFO in InAs/AlSb *** charge distributions and strain states indicate that moderate growth temperature of 470°C promotes the As-Sb exchange at AlSb-on-InAs(AOI)interfaces,which would introduce skew of energy band structure towards InAs-on-AlSb(IOA)*** band structure could drive electrons and holes to the IOA interfaces simultaneously,thus resulting in the enhanced *** this basis,insertion of relatively thick(0.3 nm)AlAs layers is found to squeeze more holes towards adjacent interfaces,boosting the WFO *** InAs/AlSb superlattices with optimized WFO reveal better optical performance,where the peak intensity shows 50%improvement in the PL spectra than the original ***,a dual-miniband radiative transition mechanism appears in the InAs/AlSb superlattice with relatively thick AlAs intercalation,which helps broaden the wavelength range of the superlattice.

关键词： wave function overlap type-II superlattices photoelectric properties charge distribution energy band alignment

The Research of One Novel Cost-Sensitive Classification Algorithm

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Chinese Journal of Electronics 2018年第5期27卷 1015-1024页

作者： ZHOU Jingjing SUN Weifeng HAN Xiaomin LU Ruqiang zhang Yuanqi zhang Shenwei Zhejiang Gongshang University School of Software Dalian University of Technology

Assuming that misclassification costs between different categories are equal, traditional Graph based semi-supervised classification(GSSC) algorithms pursues high classification accuracy. In many practical problems, especially in the fields of finance and medicine,compared with global classification accuracy, less cost on global misclassification is more likely to be the most significant factor. We propose one novel cost-sensitive classification algorithm based on the local and global consistency, which utilizes the semi-supervised classification algorithms better, and ensures higher classification accuracy on the basis of reducing overall cost. Our improved algorithm may bring some problems due to unbalanced data account, so we introduce synthetic minority oversampling technique algorithm for further optimization. Experimental results of bank loans and medical problems verify the effectiveness of our novel classification algorithm.

关键词： Graph-based semi-supervised classification(GSSC) Cost-sensitive Rescale

A motion characteristics modeled angular position sensor by nonlinear transfer of differential capacitance for miniaturized scanning mirrors

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Microsystems & Nanoengineering 2023年第6期9卷 129-147页

作者： Songtao Liu Gaofei zhang Lingyun zhang Junya Wang Minghao Gong Zheng You Department of Precision Instrument Tsinghua UniversityBejing 100084China Key Laboratory of Smart Microsystem(Tsinghua University) Ministry of EducationBeijing 100084China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua UniversityBeijing 100084China School of Mechanical Science&Engineer Huazhong University of Science and TechnologyWuhan 430074China

In this paper,an angular position sensor(APS)designed for a resonant miniaturized scanning mirror(M-SM)is *** APS operates based on the principle of differential variable capacitance,significantly expanding the detectable bandwidth from a few hertz to several *** modeling the motion characteristics,the sampling rates of the biaxial scanning angles are 1473.6 times and 539.4 times higher than those of conventional ***,the motion characteristics model is presented as a simple harmonic motion,converting sampled capacitance into continuous ***,the nonparallel state of the M-SM and sensor is transformed into a parallel state through the space coordinate system ***,a 2D nonlinear angle transfer function is developed to convert the differential capacitance into an angle,thereby mitigating the nonlinear errors resulting from large *** an accuracy better than 0.014°,the measuring range expands from±0.5729°(±10 mrad)to±5.026°(±87 mrad).Additionally,the capturing mode and tracking mode are proposed to monitor real-time angular changes of the M-SM with an accuracy of 0.017°.High-precision APSs have enhanced beam pointing accuracy and resolution and can thereby be used to advance the development of laser components,including light detection and ranging(LiDAR).

关键词： capacitance angular nonlinear

KOH-assisted aqueous synthesis of bimetallic metal-organic frameworks and their derived selenide composites for efficient lithium storage

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 601-610页

作者： Shuya zhang Yanchun Xue Yutang zhang Chengxing Zhu Xingmei Guo Fu Cao Xiangjun Zheng Qinghong Kong Junhao zhang Tongxiang Fan School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Materials Science and Engineering Shanghai Jiaotong UniversityShanghai 200240China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang 212013China Foshan(Southern China)Institute for New Materials Foshan 528200China

To solve low efficiency,environmental pollution,and toxicity for synthesizing zeolitic imidazolate frameworks(ZIFs)in organic solvents,a KOH-assisted aqueous strategy is proposed to synthesize bimetallic ZIFs polyhedrons,which are used as precursors to prepare bimetallic selenide and N-doped carbon(NC)*** them,Fe–Co–Se/NC retains the three-dimensional(3D)polyhedrons with mesoporous structure,and Fe–Co–Se nanoparticles are uniform in size and evenly *** assessed as anode material for lithium-ion batteries,Fe–Co–Se/NC achieves an excellent initial specific capacity of 1165.9 m Ah·g^(-1)at 1.0 A·g^(-1),and the reversible capacity of Fe–Co–Se/NC anode is 1247.4 m Ah·g^(-1)after 550 *** is attributed to that the uniform composite of bimetallic selenides and N-doped carbon can effectively tune redox active sites,the stable 3D structure of Fe–Co–Se/NCs guarantees the structural stability and wettability of the electrolyte,and the uniform distribution of Fe–Co–S nanoparticles in size esuppresses the volume expansion and accelerates the electrochemical reaction kinetics.

关键词： potassium hydroxide assisted aqueous strategy bimetallic zeolitic imidazolate frameworks bimetallic selenide lithium-ion batteries long cycle performance

Landslide susceptibility mapping using hybrid random forest with GeoDetector and RFE for factor optimization

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Geoscience Frontiers 2021年第5期12卷 355-373页

作者： Xinzhi Zhou Haijia Wen Yalan zhang Jiahui Xu Wengang zhang School of Civil Engineering Chongqing UniversityChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Ministry of EducationChongqing UniversityChongqing 400045China Key Laboratory of GIS Application Research Chongqing Normal UniversityChongqing 401331China

The present study aims to develop two hybrid models to optimize the factors and enhance the predictive ability of the landslide susceptibility *** this,a landslide inventory map was created with 406 historical landslides and 2030 non-landslide points,which was randomly divided into two datasets for model training(70%)and model testing(30%).22 factors were initially selected to establish a landslide factor *** applied the GeoDetector and recursive feature elimination method(RFE)to address factor optimization to reduce information redundancy and collinearity in the ***,the frequency ratio method,multicollinearity test,and interactive detector were used to analyze and evaluate the optimized ***,the random forest(RF)model was used to create a landslide susceptibility map with original and optimized *** resultant hybrid models GeoDetector-RF and RFE-RF were evaluated and compared by the area under the receiver operating characteristic curve(AUC)and *** accuracy of the two hybrid models(0.868 for GeoDetector-RF and 0.869 for RFE-RF)were higher than that of the RF model(0.860),indicating that the hybrid models with factor optimization have high reliability and *** RFE-RF GeoDetector-RF had higher AUC values,respectively 0.863 and 0.860,than RF(0.853).These results confirm the ability of factor optimization methods to improve the performance of landslide susceptibility models.

关键词： Landslide susceptibility mapping GeoDetector Recursive feature elimination Random forest Factor optimization