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Diverge from the norm

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National Science Review 2014年第1期1卷 22-24页

作者： Zhen Li Anjun Qin department of Chemistry Wuhan University department of polymer Science and engineering Zhejiang University Guangdong Innovative Research Team State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

It has been a general belief that luminophore aggregation normally quenches light emission.he conceptualization of‘aggregation-induced emission’(AIE)breaks this‘common law’and provides a new stage for the exploration of practically useful light-emiting materials.he booming development in this emerging area of research has recently been showcased at the First International Symposium on Aggregation-Induced Emission(ISAIE)held in Wuhan,China.

关键词： AIE Diverge from the norm

Experimental Investigation of material Removal in Elliptical Vibration Cutting of Cortical Bone

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Chinese Journal of Mechanical engineering 2023年第2期36卷 106-115页

作者： Wei Bai Yuhao Zhai Jiaqi Zhao Guangchao Han Linzheng Ye Xijing Zhu Liming Shu Dong Wang Mechanical engineering and Electronic Information China University of GeosciencesWuhan 430074China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000China Shenzhen Research Institute China University of GeosciencesShenzhen 518057China School of Mechanical engineering North University of ChinaTaiyuan 030051China department of Mechanical engineering School of EngineeringThe University of TokyoTokyo 113‑8656Japan College of engineering Mathematics and Physical SciencesUniversity of ExeterExeter EX44QFUK

To benefit tissue removal and postoperative rehabilitation,increased efficiency and accuracy and reduced operating force are strongly required in the osteotomy.A novel elliptical vibration cutting(EVC)has been introduced for bone cutting compared with conventional cutting(CC)in this paper.With the assistance of high-speed microscope imaging and the dynamometer,the material removals of cortical bone and their cutting forces from two cutting regimes were recorded and analysed comprehensively,which clearly demonstrated the chip morphology improvement and the average cutting force reduction in the EVC process.It also revealed that the elliptical vibration of the cutting tool could promote fracture propagation along the shear direction.These new findings will be of important theoretical and practical values to apply the innovative EVC process to the surgical procedures of the osteotomy.

关键词： Elliptical vibration cutting Cortical bone material removal Chip formation Chip morphology Fracture propagation Cutting force Osteotomy

Research status of biodegradable metals designed for oral and maxillofacial applications:A review

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Bioactive materials 2021年第11期6卷 4186-4208页

作者： Dandan Xia Fan Yang Yufeng Zheng Yunsong Liu Yongsheng Zhou department of Prosthodontics Peking University School and Hospital of StomatologyBeijing100081China National engineering Laboratory for Digital and material Technology of Stomatology National Clinical Research Center for Oral DiseasesBeijing Key Laboratory of Digital StomatologyNational Medical Products AdministrationKey Laboratory for Dental MaterialsResearch Center of Engineering and Technology for Digital DentistryMinistry of HealthBeijing100081China department of materials Science and engineering College of EngineeringPeking UniversityBeijing100871China

The oral and maxillofacial regions have complex anatomical structures and different tissue types,which have vital health and aesthetic functions.Biodegradable metals(BMs)is a promising bioactive materials to treat oral and maxillofacial diseases.This review summarizes the research status and future research directions of BMs for oral and maxillofacial applications.Mg-based BMs and Zn-based BMs for bone fracture fixation systems,and guided bone regeneration(GBR)membranes,are discussed in detail.Zn-based BMs with a moderate degradation rate and superior mechanical properties for GBR membranes show great potential for clinical translation.Fe-based BMs have a relatively low degradation rate and insoluble degradation products,which greatly limit their application and clinical translation.Furthermore,we proposed potential future research directions for BMs in the oral and maxillofacial regions,including 3D printed BM bone scaffolds,surface modification for BMs GBR membranes,and BMs containing hydrogels for cartilage regeneration,soft tissue regeneration,and nerve regeneration.Taken together,the progress made in the development of BMs in oral and maxillofacial regions has laid a foundation for further clinical translation.

关键词： Biodegradable metals Oral and maxillofacial region Bone fracture Bone fixation Bone defect Guided bone regeneration

engineering flexible and green electromagnetic interference shielding materials with high performance through modulating WS_(2) nanosheets on carbon fibers

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Journal of Materiomics 2022年第2期8卷 327-334页

作者： Huibin Zhang Tingting Liu Zehao Huang Junye Cheng Honghan Wang Deqing Zhang Xuewei Ba Guangping Zheng Ming Yan Maosheng Cao School of materials Science and engineering Qiqihar UniversityQiqihar 161006China department of Mechanical engineering Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina department of materials Science and engineering And Shenzhen Key Laboratory for Additive Manufacturing of High-performance MaterialsSouthern University of Science and TechnologyShenzhen 518055China School of materials Science and engineering Beijing Institute of TechnologyBeijing 100081China

Flexible and wearable electromagnetic interference(EMI)shielding material is one of the current research focuses in the field of EMI shielding.In this work,for the first time,WS_(2)-carbon fiber(WS_(2)-CF)composites are synthesized by implanting WS_(2),which has a multiphase structure and a large number of defects,onto the surface of carbon fiber(CF)by using a simple one-step hydrothermal method,and are applied to protect electronic devices from EMI.It is found that the EMI shielding performance of WS_(2)-CF is significantly improved,especially for those at Se and C-bands.At 2 GHz,the EMI shielding efficiency could reach 36.0 dB at a typical thickness of 3.00 mm of the composite,which is much better than that of pure CF(25.5 dB).Besides paving a novel avenue to optimize the electromagnetic shielding performance of flexible and wearable CF-based EMI shielding materials,which have great potential in the practical application for EMI shielding,this work provides a new paradigm for the design and synthesis of EMI shielding materials which have a broad application prospect.

关键词： Flexible electromagneic shielding Carbon fibers WS_(2) Conductive networks

Light amplified oxidative stress in tumor microenvironment by carbonized hemin nanoparticles for boosting photodynamic anticancer therapy

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Light(Science & Applications) 2022年第3期11卷 52-67页

作者： Liyun Lin Wen Pang Xinyan Jiang Shihui Ding Xunbin Wei Bobo Gu Med-X Research Institute and School of Biomedical engineering Shanghai Jiao Tong UniversityShanghai200030China Biomedical engineering department Peking UniversityBeijing100081China Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing) Peking University Cancer Hospital&InstituteBeijing100142China

Photodynamic therapy(PDT),which utilizes light excite photosensitizers(PSs)to generate reactive oxygen species(ROS)and consequently ablate cancer cells or diseased tissue,has attracted a great deal of attention in the last decades due to its unique advantages.However,the advancement of PDT is restricted by the inherent characteristics of PS and tumor microenvironment(TME).It is urgent to explore high-performance PSs with TME regulation capability and subsequently improve the therapeutic outcomes.Herein,we reported a newly engineered PS of polymer encapsulated carbonized hemin nanoparticles(P-CHNPs)via a facile synthesis procedure for boosting photodynamic anticancer therapy.Solvothermal treatment of hemin enabled the synthesized P-CHNPs to enhance oxidative stress in TME,which could be further amplified under light irradiation.Excellent in vitro and in vivo PDT effects were achieved due to the improved ROS(hydroxyl radicals and singlet oxygen)generation efficiency,hypoxia relief,and glutathione depletion.Moreover,the superior in vitro and in vivo biocompatibility and boosted PDT effect make the P-CHNPs a potential therapeutic agent for future translational research.

关键词： boosting oxidative stress

Effects of Implant Copper Layer on Diamond Film Deposition on Cemented Carbides

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Plasma Science and Technology 2001年第1期3卷 647-651页

作者：马志斌汪建华邬钦崇王传新 department of material engineering Wuhan Institute of Chemical Technology Wuhan 430073 China The Institute of Plasma Physics the Chinese Academy of Sciences Hefei 230031 China

The deposition of high-quality diamond films and their adhesion on cemented carbides are strongly influenced by the catalytic effect of cobalt under typical deposition conditions. Decreasing Co content on the surface of the cemented carbide is often used for the diamond film deposition. But the leaching of Co from the WC-Co substrate leading to a mechanical weak surface often causes a poor adhesion. In this paper we adopted an implant copper layer prepared by vaporization to improve the mechanical properties of the Co-leached substrate. The diamond films were grown by microwave plasma chemical vapor deposition from CH4:H2 gas mixture. The cross section and the morphology of the diamond film were characterized by scanning electron microscopy (SEM). The non-diamond content in the film was analyzed by Raman spectroscopy. The effects of pretreatment on the concentrations of Co and Cu near the interfacial region were examined by energy dispersive spectrum (EDS) equipped with SEM. The adhesion of the diamond on the substrate was evaluated with a Rockwell-type hardness tester. The results indicate that the diamond films prepared with implant copper layer have a good adhesion to the cemented carbide substrate due to the recovery of the mechanical properties of the Co-depleted substrate after the copper implantation and the formation of less amorphous carbon between the substrate and the diamond film.

关键词： Effects of Implant Copper Layer on Diamond Film Deposition on Cemented Carbides Co

Microstructure characteristics of coating with amorphous phases prepared from Fe-based alloy powders by plasma spray

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China Welding 2013年第4期22卷 68-73页

作者：雷阿利冯拉俊王兆华张静 materials Science and engineering Xi' an University of Technology Xi' an 710048 material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science & Engineering Zigong643000

In this paper, alloy powders mixed with a molar ratio of Fe ： P ： C of 80 ： 13 ： 7 were sprayed on Q235 steel by plasma spray method to prepare coating with amorphous phases. The phase composition of the mixed alloy powders and prepared coating were characterized by X-ray diffraction （ XRD ）. The morphology and the composition cf the coating were analyzed by scanning eleetron microscopy （SEM） nnd energy dispersive apectroscopy （ EDS ）. In addition, the thermal stability ef the coating with amorphous phases was characterized by differential thermal analyzer （ DTA ）. Tile results showed that, usirtg mixed alloy powders with a molar ratio of Fe： P： C of 80：13：7, the coating containing certain amount of amorphous alloys was suceessathlly prepared through atmospheric plasma spray technique. In the coating, the main phases were determined to be Fe, FeP aad Fe2P. The crystallization of the coating started from about 461°. Tile coating was mechanically adhered to the substrate.

关键词： plasma spray coating with amorphous phase microstructure thermal stability

Spectral Properties and Photochromic Characteristics of Spiropyran Dyes

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Chemical Research in Chinese Universities 2006年第4期22卷 505-509页

作者： SHEN Kai-hua HAN Jian-guo ZHANG Gang CHOI Dong-hoon The State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 P. R. China The Key Laboratory of Cellulose and Lignocellulosics Chemistry Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 P. R. China polymer and Fiber material engineering Kyunghee University Kyong Kido 449-701 Korea

A bis-benzospiropyran（BBSP） and nitro-substituted indoline spirobenzopyrans（SBP） were prepared by following a simple procedure. The reaction mechanism of synthesizing bis-benzospiropyran is discussed. A comparative analysis of the spectral and photochromic properties between SBP and BBSP was carried out with the aid of a PMMA film. The results indicate that chemical structures and UV irradiation played an important role in the spectral and photochromic properties of SBP and BBSP, which would readily affect λmax of the colored forms and the reversibility. The IR spectra and ^1H NMR spectra of these compounds are used to interpret the photochromic phenomena under different UV irradiation and determine the configurations of SBP and BBSP.

关键词： Photochromism Spiropyran UV radiation Protonation

On-demand Direct Design of polymeric Thermal Actuator by Machine Learning Algorithm

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Chinese Journal of polymer Science 2020年第8期38卷 908-914,I0009页

作者： Bo-En Liu Wei Yu Advanced Rheology Institute Department of Polymer Science and EngineeringState Key Laboratory for Metal Matrix Composite MaterialsShanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong UniversityShanghai 200240China

The design optimization of thermal-driven actuators is a challenging task because the performance depends on multiple materials parameters,structural parameters,and working conditions.In this work,we adopted large scale finite element simulation together with machine learning algorithm to fulfill the on-demand design of thermal actuators.Finite element analysis was used to simulate the performance of thermal actuator with two-layer structure,which generated large amount of dataset by considering the variation of parameters including the moduli,thermal expansion coefficient,sample thickness and length,and temperature.Support vector regression(SVR)was adopted to establish the relationship between multiple input parameters and the resulting contact pressure.Thereafter,a simple interior point algorithm was used to achieve the on-demand design based on the SVR model.The contact pressures of thermal actuator constructed from the optimized parameters deviated less than 15%of the target values.

关键词： polymer composites Thermal actuator Finite element analysis Support vector regression