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Over 16% efficiency all-polymer solar cells by sequential deposition

Science China Chemistry 2022年第6期65卷 1157-1163页

作者： Bangbang Li Xuanyu Zhang Ziang Wu Jie Yang Bin Liu Qiaogan Liao Junwei Wang Kui Feng Rui Chen Han Young Woo Fei Ye Li Niu Xugang Guo Huiliang Sun department of materials Science and Engineering Southern University of Science and Technology(SUSTech)Shenzhen518055China Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou510006China department of Electrical and Electronic Engineering Southern University of Science and Technology(SUSTech)Shenzhen518055China department of Chemistry Korea UniversitySeoul136-713Republic of Korea Guangdong Provincial Key Laboratory of Functional Oxide materials and Devices SUSTechShenzhen518055China

All-polymer solar cells(all-PSCs) have received extensive attention due to their excellent mechanical robustness and performance stability. However, the power conversion efficiency(PCE) of all-PSCs still lags behind those of organic solar cells(OSCs)based on non-fullerene small molecule acceptors. Herein, we report highly efficient all-PSCs via sequential deposition(SD) with donor and acceptor layers coated sequentially to optimize the film microstructure. Compared with the bulk heterojunction(BHJ)all-PSCs, an optimized morphology with vertical component distribution was achieved for the SD-processed all-PSCs due to the synergistic effect of swelling of polymer films and using additive. Such strategy involves using chlorobenzene as the first layer processing-solvent for polymer donor, chloroform as the second processing-solvent for polymer acceptor with trace 1-chloronaphthalene, efficiently promoting exciton dissociation and charge extraction and reducing trap-assisted ***, over 16% all-PSCs fabricated via SD method was realized for the first time, which is much higher than that(15.2%) of its BHJ counterpart and also among the highest PCEs in all-PSCs. We have further demonstrated the generality of this approach in various all-polymer systems. This work indicates that the SD method can yield excellent all-PSCs and provides a facile approach to fabricating high-performance all-PSCs.

关键词： all-polymer solar cells polymer acceptors planar heterojunction sequential deposition

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Enhancing the formability of FeSi6.5 steel by the anodic polarization

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International Journal of Minerals,Metallurgy and materials 2022年第11期29卷 2072-2078页

作者： Dong Zhao Feng Ye Binbin Liu Haoyang Du Yaakov B.Unigovski Emmanuel M.Gutman Roni Shneck State Key Laboratory for Advanced Metals and materials University of Science and Technology BeijingBeijing 100083China State Grid Jilin Electric Power Research Institute Jilin 130021China department of materials Engineering Ben-Gurion University of the NegevBeer-Sheva 84105Israel

The effect of anodic polarization on the plastic deformation behavior and formability of FeSi6.5 steel at room temperature was experimentally investigated through uniaxial tensile and drawing of wire specimen in sulfuric acid solution with current densities of 0-40 mA/*** formability of the FeSi6.5 steel was significantly improved after the anodic *** plastic elongation of the specimen as an anode in the electrochemical environment was 4.4%-7%,but 2.7%in the *** drawing force under the anodic polarization decreased by 12.5%-26%compared to that in deionized *** softening is mainly attributed to the relief in work hardening caused by surface atomic *** work hardening mechanism of the FeSi6.5 steel wires under anodic polarization condition was analyzed using Hollomon equation and Voce relation combined with the Kocks-Mecking *** data support the view that the surface atom dissolution facilitates dislocation ***6.5 steel wires were obtained using electrochemical cold drawing and presented a smooth surface and good ductility without crack after five-pass drawing with a total cross-section area reduction of 88%.The drawing with the assistance of anodic polarization is a promising technology for processing hard and brittle metal materials.

关键词： FeSi6.5 steel plastic deformation anodic polarization Voce equation

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FEM simulation and experimental verification of roll forming and springback process under complex contact conditions

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High technology Letters 2015年第4期21卷 433-438页

作者：阎昱 Wu Qingyuan Ai Zhengqing Jia Fanghui School of mechanical and materials Engineering North China University of Technology

The application of advanced high strength steel(AHSS) has an important significance in the development of the lightweight of automobile,but the parts made of AHSS usually have defects,such as fracture and large amount of springback,*** this paper,a model of multi-pass roll forming and springback process of AHSS is established with finite element software *** a roll forming experiment is performed,and simulation and experimental results have been compared and *** model is established under complex contact conditions,including self-contact *** results shows that during the process of sheet bending,large Mises stresses appear at bending *** smaller the bending radius is,the larger the Mises stress and strain *** of sheet metal changes differendy if the bending radius is *** the bending radius exceeds a certain limit,the change tendency of the sheet thickness turns from increase to decrease.

关键词：回弹过程接触条件辊弯成形有限元模拟试验验证弯曲半径 ABAQUS 金属板材

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Tribological properties of electroless Ni-P-SiC composite coatings in rolling/sliding contact under boundary lubrication

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Journal of University of Science and technology Beijing 2007年第2期14卷 167-172页

作者： Wei-Long Liu Shu-Hue Hsieh Shen-Jenn Hwang Ting-Kan Tsai Wen-Jauh Chen department of materials Science and Engineering Formosa University Huwei China Taipei department of mechanical Design Engineering Formosa University Huwei China Taipei department of materials Engineering Pingtung University of Science and Technology Pingtung China Taipei

Ni-P-SiC composite coatings were prepared under a given bath composition and operation parameters of electroless plating. The tribological properties of the Ni-P-SiC composite coatings after annealing at 400℃ for 1 h were tested in rolling/sliding contact under boundary lubrication condition using a two-roller tribometer. The measurement contained friction coefficient, contact surface temperature, contact electrical resistance, and wear rate of the Ni-P-SiC composite coatings under various slide to roll ratios, loads, and rolling speeds. For the simultaneous examination of the effect of the chosen parameters on the tribological properties of the Ni-P-SiC composite coatings, an orthogonal regression experimental design method was used.

关键词： Ni-P-SiC composite coating rolling-sliding friction wear two-roller test

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Mechanism of superlubricity of a DLC/Si_(3)N_(4) contact in the presence of castor oil and other green lubricants

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Friction 2022年第10期10卷 1693-1706页

作者： Yun LONG Yang WANG Volker WEIHNACHT Stefan MAKOWSKI Momoji KUBO Jean Michel MARTIN Maria-Isabel DE BARROS BOUCHET Ecole Centrale de Lyon Laboratory of Tribology and System DynamicsUniversity of LyonEcully 69134France Institute for materials Research Tohoku UniversitySendai 980-8577Japan department of mechanical Systems Engineering Graduate School of EngineeringTohoku UniversitySendai 980-8579Japan Fraunhofer Institute for Material and Beam technology(IWS) Dresden 01277Germany

To meet the surging needs in energy efficiency and eco-friendly lubricants,a novel superlubricious technology using a vegetable oil and ceramic materials is *** coupling different hydrogen-free amorphous carbon coatings with varying fraction of sp^(2) and sp^(3) hybridized carbon in presence of a commercially available silicon nitride bulk ceramic,castor oil provides superlubricity although the liquid vegetable oil film in the contact is only a few nanometres thick at *** a partial liquid film possibly separating surfaces in contact,local tribochemical reactions between asperities are essential to maintain superlubricity at low *** local pressure activates chemical degradation of castor oil generating graphitic/graphenic-like species on top of asperities,thus helping both the chemical polishing of surface and its chemical passivation by H and OH ***,the formation of the formation of–(CH_(2)–CH_(2))n–noligomers have been evidenced to have a major role in the friction *** simulation unveils that formation of chemical degradation products of castor oil on friction surfaces are favoured by the quantity of sp^(2)-hybridized carbon atoms in the amorphous carbon ***,tuning sp^(2)-carbon content in hydrogen-free amorphous carbon,in particular,on the top layers of the coating,provides an alternative way to control superlubricity achieved with castor oil and other selected green lubricants.

关键词： superlubricity diamond-like carbon(DLC) sp^(2)-hybridized carbon hydrogen passivation castor oil

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Biomaterials and tissue engineering in traumatic brain injury:novel perspectives on promoting neural regeneration

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Neural Regeneration Research 2024年第10期19卷 2157-2174页

作者： Shihong Zhu Xiaoyin Liu Xiyue Lu Qiang Liao Huiyang Luo Yuan Tian Xu Cheng Yaxin Jiang Guangdi Liu Jing Chen department of Neurosurgery West China HospitalWest China Medical SchoolSichuan UniversityChengduSichuan ProvinceChina National Engineering Research Center for Biomaterials College of Biomedical EngineeringSichuan UniversityChengduSichuan ProvinceChina department of Anesthesiology West China HospitalWest China Medical SchoolSichuan UniversityChengduSichuan ProvinceChina department of Pharmacy West China HospitalWest China Medical SchoolSichuan UniversityChengduSichuan ProvinceChina Out-patient department West China HospitalWest China Medical SchoolSichuan UniversityChengduSichuan ProvinceChina department of Respiratory and Critical Care Medicine West China HospitalWest China Medical SchoolSichuan UniversityChengduSichuan ProvinceChina

Traumatic brain injury is a serious medical condition that can be attributed to falls, motor vehicle accidents, sports injuries and acts of violence, causing a series of neural injuries and neuropsychiatric symptoms. However, limited accessibility to the injury sites, complicated histological and anatomical structure, intricate cellular and extracellular milieu, lack of regenerative capacity in the native cells, vast variety of damage routes, and the insufficient time available for treatment have restricted the widespread application of several therapeutic methods in cases of central nervous system injury. Tissue engineering and regenerative medicine have emerged as innovative approaches in the field of nerve regeneration. By combining biomaterials, stem cells, and growth factors, these approaches have provided a platform for developing effective treatments for neural injuries, which can offer the potential to restore neural function, improve patient outcomes, and reduce the need for drugs and invasive surgical procedures. Biomaterials have shown advantages in promoting neural development, inhibiting glial scar formation, and providing a suitable biomimetic neural microenvironment, which makes their application promising in the field of neural regeneration. For instance, bioactive scaffolds loaded with stem cells can provide a biocompatible and biodegradable milieu. Furthermore, stem cells-derived exosomes combine the advantages of stem cells, avoid the risk of immune rejection, cooperate with biomaterials to enhance their biological functions, and exert stable functions, thereby inducing angiogenesis and neural regeneration in patients with traumatic brain injury and promoting the recovery of brain function. Unfortunately, biomaterials have shown positive effects in the laboratory, but when similar materials are used in clinical studies of human central nervous system regeneration, their efficacy is unsatisfactory. Here, we review the characteristics and properties

关键词： bioactive materials biomaterials exosomes neural regeneration scaffolds stem cells tissue engineering traumatic brain injury

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Effect of deep cryogenic treatment on the microstructural,mechanical and ballistic properties of AA7075-T6 aluminum alloy

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Defence technology（防务技术） 2023年第12期30卷 101-110页

作者： S.Dharani kumar U.Magarajan Saurabh S Kumar Rodríguez-Millan M Centre for Machining and Material Testing KPR Institute of Engineering and TechnologyCoimbatoreIndia department of mechanical Engineering Sri Venkateswara College of EngineeringChennaiIndia Scientific Officer Ballistic Research Centre&Testing RangeNational Forensic Sciences UniversityGandhi NagarIndia department of mechanical Engineering University Carlos Ⅲ of MadridLeganesMadridSpain

The study focused on investigating the effect of Deep Cryogenic Treatment(DCT)on the mechanical and ballistic properties of AA7075-T6 aluminum *** microstructure,microhardness,tensile strength,and impact strength of the Base Material(BM)and DCT-treated 7075 samples were analyzed through metallographic analysis and mechanical *** microstructure of the DCT-treated 7075 samples revealed fine grains and a distribution of secondary phase *** tensile strength,impact strength,and microhardness of DCT-treated samples increased by 7.41%,4%,and 9.68%,respectively,compared to the BM *** fractography analysis of the tensile samples showed cleavage facets,microvoids,and dimples in both the *** ballistic behavior of the BM and DCT target plates were studied by impacting hard steel core projectiles at a velocity of 750±10 m/*** target plates failed due to petaling and ductile hole enlargement,and the depth of penetration(DOP)of the DCT target was less than that of the BM target,indicating a higher ballistic *** post-ballistic microstructure examination of the target plates showed the formation of an Adiabatic Shear Band(ASB)without any *** was concluded that the DCT treatment improved the mechanical and ballistic properties of the aluminum alloy due to grain refinement and high dislocation density.

关键词： Deep cryogenic treatment AA7075-T6 mechanical properties Ballistic Adiabatic shear band

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Hierarchically porous cellulose nanofibril aerogel decorated with polypyrrole and nickel-cobalt layered double hydroxide for high-performance nonenzymatic glucose sensors

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1593-1607页

作者： Xuanze Li Wenyan Tian Caichao Wan Sulai Liu Xinyi Liu Jiahui Su Huayun Chai Yiqiang Wu College of materials Science and Engineering Central South University of Forestry and TechnologyChangsha 410004China department of Hepatobiliary Surgery Hunan Provincial People’s HospitalChangsha 410000China

With increasing emphasis on green chemistry,biomass-based materials have attracted increased attention regarding the development of highly efficient functional ***,a new pore-rich cellulose nanofibril aerogel is utilized as a substrate to integrate highly conductive polypyrrole and active nanoflower-like nickel-cobalt layered double hydroxide through in situ chemical polymerization and *** ternary composite can act as an effective self-supported electrode for the electrocatalytic oxidation of *** the synergistic effect of three heterogeneous components,the electrode achieves outstanding glucose sensing performance,including a high sensitivity(851.4μA·mmol^(−1)·L·cm^(−2)),a short response time(2.2 s),a wide linear range(two stages:0.001−8.145 and 8.145−35.500 mmol·L^(−1)),strong immunity to interference,outstanding intraelectrode and interelectrode reproducibility,a favorable toxicity resistance(Cl^(‒)),and a good long-term stability(maintaining 86.0%of the original value after 30 d).These data are superior to those of some traditional glucose sensors using nonbiomass *** determining the blood glucose level of a human serum,this electrode realizes a high recovery rate of 97.07%–98.89%,validating the potential for highperformance blood glucose sensing.

关键词： cellulose nanofibril aerogel nickel-cobalt layered double hydroxide polypyrrole nonenzymatic glucose sensor

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Design and analysis of shift robot with passive joint

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High technology Letters 2022年第1期28卷 30-39页

作者：赵京 DUAN Yaxing ZHANG Ziqiang XIE Biyun College of mechanical Engineering and Applied Electronics technology Beijing University of TechnologyBeijing 100124P.R.China department of Electrical and Computer Engineering University of Kentucky Lexington 40506USA

In order to improve the efficiency of gear shifter testing,a kind of shift robot with a special pas-sive joint is proposed to complete the human-like shifting operation *** shift robot is mainly composed of two prismatic pairs,a cylindrical pair and a passive *** two prismatic pairs act as actuators of the mechanism to complete a part of the shifting operation,and then the shift lever can be pulled into the accurate gear position by the shift torque of the gear ***,the shifting lever may skip the target gear position into the next gear *** order to solve the gear-skip phenomenon,a limit block is applied to the passive ***,the shifting processes are simulated through the dynamic model of the shift *** optimal position of the limit block is de-termined based on its dynamic characteristics.

关键词： shift robot shifting operation passive joint dynamic model gear shifter

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The physical origin of observed repulsive forces between general dislocations and twin boundaries in FCC metals:An atom-continuum coupling study

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Journal of materials Science & technology 2022年第14期109卷 221-227页

作者： Jiayong Zhang Hongwu Zhang Qian Li Lizi Cheng Hongfei Ye Yonggang Zheng Jian Lu department of Engineering Mechanics State Key Laboratory of Structural Analysis for Industrial EquipmentFaculty of Vehicle Engineering and MechanicsDalian University of TechnologyDalian 116024China department of mechanical Engineering Shenyang National Laboratory for Materials ScienceGreater Bay Joint DivisionCity University of Hong KongTat Chee AvenueKowloonHong KongChina CityU-Shenzhen Futian Research Institute Shenzhen 518045China

The combination of ultrahigh strength and excellent ductility of nanotwinned materials is rooted in the interaction between dislocations and twin boundaries(TBs).Quantifying the interaction between TBs and dislocations not only offers fresh perspectives of designing materials with high strength and ductility,but also becomes the cornerstone of multiscale modeling of materials with *** this work,an atomcontinuum coupling model was adopted to quantitatively investigate the interaction between dislocations and *** simulation shows that the dislocation-TB interaction is much weaker than the interaction between dislocations at the same *** of the early stage of dislocation pileups further verifies that the experimentally observed repulsive forces are essentially from the dislocations or kink-like steps on *** interaction between TBs and dislocations with different Burgers vectors was demonstrated referring to the elastic theory of *** the intrinsic interaction between dislocations and TBs being clarified,this work will promote further development of the multiscale simulation methods,such as discrete dislocation dynamics or phase-field method,of materials with TBs by providing a quantitative description of the interactions between TBs and dislocations.

关键词： Twin boundary Intrinsic interaction Repulsive force Dislocation pileup Atomistic simulation Anisotropic elasticity

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