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Surface characteristics and corrosion resistance of biodegradable magnesium alloy ZK60 modified by Fe ion implantation and deposition

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Progress in Natural Science:Materials International 2014年第5期24卷 547-553页

作者： Yang Zheng Yan Li jihua chen Zhengyang Zou School of Materials Science and Engineering Beihang University Key Laboratory of Aerospace Advanced Materials and Performance Beihang University Ministry of Education Beijing Key Laboratory for Advanced Functional Materials and Thin Film Technology Beihang University School of Materials Science and Engineering Hunan University

The ZK60 magnesium alloy has been modified by Fe ion implantation and deposition with a metal vapor vacuum arc plasma source. The surface morphology, phase constituent and elemental distribution are determined by scanning electron microscopy, transmission electron microscopy, X-ray diffractometer and Auger electron spectroscopy. The results show that Fe thin film is deposited on ZK60 alloy and the corresponding thickness increases from 2.73 μm to 6.36 μm with increasing deposition time. A transition layer mainly composed of Mg, Fe and O elements is formed between Fe thin film and ZK60 substrate. The potentiodynamic polarization tests reveal that a high corrosion potential and a low corrosion current density are detected for the Fe deposited ZK60 alloy, indicating the improvement of corrosion resistance. The tensile deformation test indicates that the Fe deposited film on the ZK60 substrate can sustain 1% tensile strain without any cracks.

关键词： Biodegradable magnesium alloy Fe MEVVA Ion implantation and deposition Corrosion

Engineering surface strain for site-selective island growth of Au on anisotropic Au nanostructures

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Nano Research 2023年第4期16卷 5873-5879页

作者： Fan Yang Ji Feng Jinxing chen Zuyang Ye jihua chen Dale KHensley Yadong Yin Department of Chemistry University of CaliforniaRiversideCalifornia 92521USA Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTennessee 37831-6494USA Institute of Functional Nano&Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China

Controlled growth of islands on plasmonic metal nanoparticles represents a novel strategy in creating unique morphologies that are difficult to achieve by conventional colloidal synthesis processes,where the nanoparticle morphologies are typically determined by the preferential development of certain crystal *** work exploits an effective surface-engineering strategy for site-selective island growth of Au on anisotropic Au *** ligand modification is first employed to direct the site-selective deposition of a thin transition layer of a secondary metal,e.g.,Pd,which has a considerable lattice mismatch with *** selective deposition of Pd on the original seeds produces a high contrast in the surface strain that guides the subsequent site-selective growth of Au *** strategy proves effective in not only inducing the island growth of Au on Au nanostructures but also manipulating the location of grown *** taking advantage of the iodide-assisted oxidative ripening process and the surface strain profile on Au nanostructures,we further demonstrate the precise control of the islands’number,coverage,and wetting degree,allowing fine-tuning of nanoparticles’optical properties.

关键词： plasmonic Au nanorods island growth seed-mediated growth site-selective

Influence of sample surface condition on nano indentation experiment

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Rare Metals 2002年第2期21卷 131-132页

作者： WANG Yanli, LIN Zhi, LIN Junpin, PENG jihua, and chen GuoliangState Key laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China University of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials 北京 100083

The microhardness and elastic modules of the materials weremeasured using the Nano Indenter II, which is a new measuring systemfor the mechanical properties of materials on nano-scale. It candetermine themicrohardness, elastic modules and other mechanicalproperties of materials through measuring applied load and depthunder indenter tip. The results indicated that surface condition ofsample such as the surface roughness affects the experimental preci-sion.

关键词： microhardness elastic modules Nano Indenter

Enhancing bioactivity and stability of polymer-based materialtissue interface through coupling multiscale interfacial interactions with atomic-thin TiO2 nanosheets

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Nano Research 2023年第4期16卷 5247-5255页

作者： Rongchen Xu Xiaodan Mu Zunhan Hu Chongzhi Jia Zhenyu Yang Zhongliang Yang Yiping Fan Xiaoyu Wang Yuefeng Wu Xiaotong Lu jihua chen Guolei Xiang Hongbo Li Department of Stomatology The First Medical CenterChinese PLA General HospitalBeijing 100853China Department of Stomatology The Third Medical CenterChinese PLA General HospitalBeijing 100039China Department of Stomatology Kunming Medical UniversityKunming 650500China National Clinical Research Center for Oral Diseases&Shaanxi Key Laboratory of Stomatology Department of ProsthodonticsSchool of StomatologyThe Fourth Military Medical UniversityXi’an 710032China Department of Stomatology The Strategic Support Force Medical CenterBeijing 100101China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China

Stable and bioactive material-tissue interface(MTF)basically determines the clinical applications of biomaterials in wound healing,sustained drug release,and tissue *** many inorganic nanomaterials have been widely explored to enhance the stability and bioactivity of polymer-based biomaterials,most are still restricted by their stability and *** we demonstrate the enhanced bioactivity and stability of polymer-matrix bio-composite through coupling multiscale material-tissue interfacial interactions with atomically thin TiO_(2)*** modified with TiO_(2)nanosheets displays improved mechanical properties,hydrophilicity,and ***,we confirm that this resin can effectively stimulate the adhesion,proliferation,and differentiation into osteogenic and odontogenic lineages of human dental pulp stem cells using in vitro cell-resin interface ***_(2)nanosheets can also enhance the interaction between demineralized dentinal collagen and *** results suggest an approach to effectively up-regulate the stability and bioactivity of MTFs by designing biocompatible materials at the sub-nanoscale.

关键词： material-tissue interface TiO_(2)nanosheets pulpo-dentinal complex biomaterial resin composite

Proteins binding to the 5'-flanking regulatory elements of the human β-globin gene~1

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Cell Research 1993年第2期3卷 195-202页

作者： chen ZHIGANG, YADI chen, jihua XU, RUOLAN QIANShanghai Institute of Cell Biology, Academia Sinica, Shanghai 200031, China Shanghai Institute of Cell Biology Academia Sinica Shanghai China

The binding of nuclear proteins prepared from mouse erythroid tissue in different developmental stages to the 5’-flanking regulatory elements of human globin gene, two negative control regions(NCR1, -610 to -490 bp; NCR2,-338 to -233bp), was identified. Two stage specific protein factors corresponding to embryonic and fetal stages were found to be capable of binding to NCR2. These data provided evidence that the cis acting elements of the 5’-flanking region might be involved in the developmental control of globin gene and NCR2 might be responsible in part for the silence of globin gene in the embryonic and fetal stages.

关键词： human β-globin gene negative control region stage specific factor.

Phase segregation mechanisms of small molecule-polymer blends unraveled by varying polymer chain architecture

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SmartMat 2021年第3期2卷 367-377页

作者： jihua chen Sanjib Das Ming Shao Guoliang Li Huada Lian Jian Qin James F.Browning Jong K.Keum David Uhrig Gong Gu Kai Xiao Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTennesseeUSA Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTennesseeUSA Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhanChina Department of Materials Science and Engineering University of TennesseeKnoxvilleTennesseeUSA Department of Chemical Engineering Stanford UniversityStanfordCaliforniaUSA Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTennesseeUSA

As phase separation between the small-molecule semiconductor and the polymer binder is the key enabler of blend-based organic field-effect transistors(OFETs)fabricated by low-cost solution processing,it is crucial to understand the underlying phase separation mechanisms that determine the phase morphology,which significantly impacts device *** the parameter space investigated in previous work,here we investigate the formation of blends by varying the branch architecture of the polymer binder and by shortening the solvent dry time using ultrasonic spray *** phase morphologies of the resulting blend films have been thoroughly characterized with a variety of techniques in three dimensions over multiple length scales,including AFM,energy-filtered transmission electron microscope,and neutron reflectivity,and have been correlated with electrical transport *** the results,we have inferred that the phase morphology is kinetically determined,limited by the inherent slow movement of polymer *** kinetic picture,supported by molecular dynamics modeling,not only consistently explains our observations but also resolves inconsistencies in previous *** achieved mechanistic understanding will guide further optimization of blend-based organic electronics,such as OFETs and organic photovoltaics.

关键词： neutron reflectivity organic field-effect transistors phase separation polymer binders

统筹城乡社会养老保险现状、难点及前瞻研究--以江苏省为例

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江苏社会科学 2013年第5期 134-139页

作者：陈际华河海大学公共管理学院讲师 210098

江苏省在统筹城乡社会养老保险、提高社会养老保险统筹层次方面取得进展,着力推进企业职工基本养老保险省级统筹,13个省辖市全部合并实施城乡居民养老保险制度。但还存在城乡社会养老保障体系发展失衡、城乡社会养老保险标准参差不齐、... 详细信息

江苏省在统筹城乡社会养老保险、提高社会养老保险统筹层次方面取得进展,着力推进企业职工基本养老保险省级统筹,13个省辖市全部合并实施城乡居民养老保险制度。但还存在城乡社会养老保障体系发展失衡、城乡社会养老保险标准参差不齐、统筹层次不高、各地区财政补贴能力各异、社会保障管理服务滞后等难点问题。借鉴各地经验,江苏省将在政策、制度、标准等方面加快推进社会养老保险城乡统筹。

关键词：统筹社会养老保险难点

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Building of hFⅨ transgenic mice by spermatogenic cells

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Chinese Science Bulletin 2003年第19期48卷 2061-2063页

作者： WANG Ning, chen Xiaoguang, chen Li, YAO jihua, chen Haoming, SHEN Qi & XUE Jinglun State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, China Correspondence should be addressed to Xue Jinglun (e-mail: jlxue @***) State Key Laboratory of Genetic Engineering Institute of Genetics School of Life Sciences Fudan University Shanghai 200433 China

Human FⅨ expression vector pCMVⅨ was packaged by EffecteneTM reagent and injected into mice seminiferous tubules with glass pipettes. The expressional frame of pCMVⅨ was examined by PCR and Southern blotting among 41 progenies. There were 2 (4%) mice being integrated with hFⅨ gene into chromosomes. 4.6 ng/mL of hFⅨ protein was expressed in plasma of one mouse, which was tested by ELISA. We demonstrated that building of transgenic animals by spermatogonial stem cells is an efficient method. Meanwhile, it has also been proved to be an alternative choice for mammary gland bioreactor.

关键词：基因转录老鼠精子生成细胞抗血友病因子 FⅨ 表达载体 pCMVⅨ 乳腺生物反应器

人工湿地系统处理上海崇明高浊度富营养化水体的研究

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北京大学学报（自然科学版） 2010年第3期46卷 407-412页

作者：季兵陈季华东华大学环境科学与工程学院上海200051

介绍了一种低技术系统——人工湿地应用于中国上海崇明岛处理农村高浊度富营养化水体。该系统由氧化塘和人工湿地复合而成。氧化塘内利用生态纤维填料强化微生物的种类和浓度,形成了藻菌共生体系;人工湿地底部基质采用比表面积大的陶粒... 详细信息

介绍了一种低技术系统——人工湿地应用于中国上海崇明岛处理农村高浊度富营养化水体。该系统由氧化塘和人工湿地复合而成。氧化塘内利用生态纤维填料强化微生物的种类和浓度,形成了藻菌共生体系;人工湿地底部基质采用比表面积大的陶粒,易于微生物挂膜和吸附悬浮颗粒物。结果表明:COD,TN,TP和浊度的去除率较高,平均去除率分别为43.60%,38.30%,65.38%和95.48%;处理效果呈现季节性变化,夏季净化效果最好。

关键词：高浊度氧化塘人工湿地脱氮除磷