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Chinese Journal of Polymer Science 2019年第1期37卷 52-58页

作者： Miao Zheng Tang-Jie Long Xiao-Ling chen jun-qi Sun State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University

Bilayer humidity-responsive actuators are generally composed of actuating and supporting layers of different materials with largely different *** kinds of bilayer actuators suffer from low adhesive force between the two layers during *** study demonstrates the preparation of humidity-responsive bilayer actuators that have the same materials in the actuating and supporting layers to avoid the adhesive *** bilayer actuators consist of a porous poly(acrylic acid)(PAA)/poly(allylamine hydrochloride)(PAH)layer and a nonporous PAA/PAH layer that are fabricated by exponentially layer-by-layer assembly *** a high/low relative humidity(RH),the nonporous PAA/PAH layer can efficiently expand/shrink by absorbing/desorbing water while the volume expansion/shrinkage of the porous PAA/PAH layer in an environment with changed humidity is significantly suppressed by the micrometer-sized *** largely different expansion/shrinkage of the nonporous and porous PAA/PAH layers when subjected to humidity changes enables rapid and reversible rolling/unrolling motions of the bilayer *** bilayer actuator shows a faster rolling speed and a larger bending curvature when subjected to a larger humidity increase.

关键词： Layer-by-layer assembly Materials science Porous films Surface chemistry

Fe_(n)Co_(55-n)与Co_(n)Mo_(55-n)(n=0~55)团簇基态的能量与结构演化

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原子与分子物理学报 2025年第5期42卷 57-66页

作者：程彪郑琪琪陈轩段海明新疆大学物理科学与技术学院乌鲁木齐830049

采用半经验的Gupta多体势函数结合遗传算法及分子动力学淬火算法,系统研究了Co_(n)Mo_(55-n)(n=0~55)与Fe_(n)Co_(55-n)(n=0~55)团簇的基态结构与能量.通过分析基态结构的相似函数、质心间距、平均键长、平均原子配位数、平均结合能、... 详细信息

采用半经验的Gupta多体势函数结合遗传算法及分子动力学淬火算法,系统研究了Co_(n)Mo_(55-n)(n=0~55)与Fe_(n)Co_(55-n)(n=0~55)团簇的基态结构与能量.通过分析基态结构的相似函数、质心间距、平均键长、平均原子配位数、平均结合能、混合能与二阶差分能.探究了团簇基态的结构特征及稳定性与团簇所含元素种类及组分的关联.结果表明:对Co-Mo混合团簇,随Co原子数目增加,Co原子依次占据团簇中心与最外层顶点,混合团簇逐渐出现组分偏析与无序现象;对Fe-Co混合团簇,基态结构主体上均体现为围绕Mackay二十面体构型的结构畸变,随Fe原子含量增加,Fe原子先占据团簇外表面顶点位置直到全部包裹Co原子,逐渐形成核壳式结构;Co_(13)Mo_(42)与Fe_(42)Co_(13)是幻数结构团簇,研究发现组分效应导致的团簇高对称性相比团簇平均键长与平均原子配位数更能解释幻数结构的成因.

关键词：遗传算法淬火算法双金属团簇基态结构

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Extra-narrowband metallic filters with an ultrathin single-layer metallic grating

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Chinese Physics B 2020年第6期29卷 242-248页

作者： Ran Wang qi-Huang Gong Jian-jun chen State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China Microelectronics Instruments and Equipments R&D Center Institude of Microelectronics of Chinese Academy of SciencesBeijing 100029China Nano-optoelectronics Frontier Center of Ministry of Education(NFC-MOE)&Collaborative Innovation Center of Quantum Matter Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Narrowband and high-transmission optical filters are extensively used in color display technology, optical information processing, and high-sensitive sensing. Because of large ohmic losses in metallic nanostructures, metallic filters usually exhibit low transmittances and broad bandwidths. By employing both strong field enhancements in metallic nano-slits and the Wood’s anomaly in a periodic metallic grating, an extra-narrowband and high-transmission metallic filter is numerically predicted in an ultrathin single-layer metallic grating. Simulation results show that the Wood’s anomaly in the ultrathin(thickness H = 60 nm) single-layer metallic grating results in large field enhancements in the substrate and low losses in the metallic grating. As a result, the transmission bandwidth(transmittance T > 60%) at λ = 1200 nm is as small as △λFWHM=1.6 nm, which is smaller than 4% of that in the previous thin dielectric and metallic filters. The corresponding quality factor is as high as Q = λ/△λFWHM= 750, which is 40 times greater than that in the previous reports. Moreover, the thickness of our metallic filter(H = 60 nm) is smaller than 40% of that in the previous reports, and its maximum transmittance can reach up to 80%. In experiments, a narrowband metallic filter with a bandwidth of about △λFWHM = 10 nm, which is smaller than 25% of that in the previous metallic filters, is demonstrated.

关键词： metallic filter extra-narrowband field enhancement Wood’s anomaly

Simulation of gas-solid flow in sinter vertical cooling furnace

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Journal of Iron and Steel Research International 2023年第11期30卷 2133-2142页

作者： Teng-fei qi Hai-feng Li jun-jie Sun Guo-jun chen Yong-jie Zhang School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina Key Laboratory for Ecological Metallurgy of Multi-Metallic Mineral(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina Technology Center Shanghai Meishan Iron and Steel Co.Ltd.Nanjing210039JiangsuChina Central Research Institute Baosteel Co.Ltd.Shanghai201900China

The velocity distribution of sinter and gas in vertical cooling furnace(VCF)has an important influence on gas-solid heat *** on the slot model of single hopper in the VCF of Meishan Iron and Steel Co.,Ltd.,the velocity and particle size distribution of sinter and the velocity and pressure distribution of gas were studied using a computational fluid dynamics-discrete element method model to obtain the gas-solid flow rule in the *** results showed that the velocity of sinter near the wall and the edge of vent cowl was lower than that in the rest of the same ***,the rectangular section of the vertical cooling furnace can be divided into a quasi-static zone,a plug flow zone and a convergent flow zone according to the flow velocity of the *** average particle size and the void fraction of sinter bed were distributed in"W"and"V"shape along the width direction,*** distribution of gas velocity in the furnace cavity was uneven,and the high-velocity area gradually changed from the center to the edge of the furnace cavity with the rise of *** the ratio of edge to center gas flow from 2.7∶1 to 0.7∶1 could improve the gas velocity,but could not change the gas velocity *** gas velocity distribution was more affected by the average particle size distribution of the sinter *** was suggested that measures need be taken to adjust it to improve the gas velocity distribution in the VCF.

关键词： Sinter Vertical cooling furnace Average particle size Void fraction Velocity distribution Gas distribution mode

Synthesis of Various Types of Silver Nanoparticles Used as Physical Developing Nuclei in Photographic Science

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Chinese Chemical Letters 2003年第6期14卷 645-648页

作者： jun Ping ZHANG Li qi SHENG Ping chen Technical Institute of Physics and Chemistry CASBeijing 100101

Ag nanoparticles used as physical developing nuclei in photographic science were prepared by reduction method. The as-formed Ag nanoparticle colloid was characterized by UV-Vis absorption spectrum, Atomic Force Microscopy(AFM) and Charge Coupled Device (CCD) technique. It is found that the source of Ag ions, the addition of surfactant and polymer, all have great influence on the size, topography and catalytic activity of Ag nanoparticles.

关键词： Ag nanoparticle AFM DTR.

Metallurgical Interpretation on Grain Refinement and Synergistic Effect of Mn and Ti in Ti-microalloyed Strip Produced by TSCR

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Journal of Iron and Steel Research International 2014年第1期21卷 30-40页

作者： Xin-ping MAO qi-lin chen Xin-jun SUN College of Materials Science and Metallurgical Engineering Wuhan University of Science and Technology Institute of Structural Materials Central Iron and Steel Research Institute

The grain refinement mechanism and synergistic effect of Mn and Ti involved in the Ti-microalloying technology of thin slab casting and direct rolling （TSCR） were elucidated. Because the inevitable precipitation of TiN in high Ti-containing liquid steel decreases the volume fraction of TiN precipitated from austenite and the rapid coarse- ning rate leads to a large size of TiN particles, a relatively weak inhibition effect on the recrystallized grain growth was obtained compared with that in the low Ti-containing steel. However, the ferrite grain size in high Ti-containing steel can be refined by the so-called non-recrystallization rolling. The complex addition of Mn and Ti can improve the strength and toughness of strip remarkably, and the mechanisms are that Mn decreases the transformation tempera- ture, refines the ferrite grains, and enhances the formation of bainite and TiC precipitation in ferrite.

关键词： thin slab casting direct roiling TSCR Ti-microalloying grain refinement precipitation

Analysis of transient mold friction under different scales based on wavelet entropy theory

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Journal of Iron and Steel Research International 2019年第10期26卷 1061-1068页

作者： Yong Ma qi-qi Ding Kai chen Lan-jun Liu Bo-han Fang Fei Liu School of Materials Science and Engineering Hefei University of TechnologyHefei 230009AnhuiChina

The mold friction(MDF)is an important parameter reflecting the lubrication between the mold and slab *** mold/slab friction was detected using an online monitoring system on a slab continuous caster equipped with hydraulic *** entropy theory was introduced to describe the fluctuation characteristics of the MDF signal in order to quantitatively estimate the mold/slab ***,MDF signal and its wavelet entropy were analyzed under typical casting conditions,such as normal casting,different models(to control the relationship among the amplitude,the frequency and the casting speed),changing casting speeds and *** results showed that the wavelet entropy could accurately reflect the overall changing trend of the mold friction as well as the local variation ***,the wavelet entropy of the hydraulic cylinder force and the MDF was compared and analyzed,and the relationship between them was further discussed.

关键词： Mold friction Wavelet entropy theory Time-frequency analysis Feature extraction Lubrication

Process parameters influence on zone refining and thermodynamics analysis of 1,2-diphenylethane

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Chinese Journal of Chemical Engineering 2022年第2期35卷 338-343页

作者： Yabing qi jun Li School of Chemistry and Chemical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Effective distribution coefficients of 9 impurities in 1,2-diphenylethane have been calculated by directional crystallization under different ambient frozen *** effect of varied zone size,temperature difference between the melt and ambient frozen environment,number of zone on purity of 1,2-diphenylethane have been also investigated during the process of zone *** results indicate that the product purity in the intermediate purified region with varied zone size is higher 0.04%–0.2%than that with constant zone *** product purity increases with temperature difference between the melt and ambient frozen *** appropriate temperature difference is adopted 50°*** product purity in the intermediate region of sample bar with 2 molten zones is higher 0.05%–0.43%than that with 1 molten *** addition,the change of enthalpy and entropy between impurities and 1,2-diphenylethane have been determined.

关键词： 12-Diphenylethane Zone refining Varied zone size Effective distribution coefficient Thermodynamics

High-performance ferroelectric based materials via high-entropy strategy:Design,properties,and mechanism

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InfoMat 2023年第12期5卷 28-53页

作者： Yueyun Zhang Liang chen Hui Liu Shiqing Deng He qi jun chen Beijing Advanced Innovation Center for Materials Genome Engineering and Department of Physical ChemistryUniversity of Science and Technology BeijingBeijingthe People's Republic of China Hainan University Haikouthe People's Republic of China

High-performance ferroelectric materials are widely used in various electronic devices owing to the function of mutual conversion among different energies,which mainly relates to their special structure gene of polarization *** researches show that the high-entropy strategy has emerged as an effective and flexible approach for boosting physical properties in high-entropy ferroelectrics via the delicate design of local polarization configurations and other intrinsic effects caused by entropy increment,such as entropy stabilization,lattice disorder,inhibition of grain coarsening,improved mechanical properties,cocktail effect,and so *** this review,the recent research progress about high-entropy ferroelectrics has been summarized,especially for the directional design of novel local polarization configurations according to the characteristics of different electrical properties such as high piezoelectricity,high-efficiency energy storage,and large electrostriction,providing a guidance for designing and exploring more novel local polarization configurations in high-entropy ferroelectrics for generating higher performance.

关键词： ferroelectric materials high performance high-entropy design local structure polarization configuration

Theoretical Study on the Structures and Electronic Spectra of the Derivatives of C_(60)-P-2,4,6-Triphenyl Borazinc

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Chinese Journal of Structural Chemistry 2005年第10期24卷 1140-1144页

作者： JIANG qi-jun Department of Chemistry Xiaogan University Xiaogan 432000 China

The structures and electronic spectra of the derivatives of C60-P-2,4,6-triphenyl borazinc have been studied by using AM 1 method. The calculated results indicate that this kind of compounds has a lower energy difference between HOMO and LUMO. It is found that the electron cloud on unoccupied frontier orbital mainly comes from the contribution of C60, while that on occupied frontier orbital mainly concentrates on the side chain. A long-lived charge-separated state may occur in the objective compounds.

关键词： derivatives of C60-P-2,4,6-triphenyl borazinc electronic spectra charge-separated state AM1