Novel cathode material for lithium ion batteries Investigation of the intercalation behavior of manganese dioxide nano fiber

采用TEM、Xrd分析等方法对新型二氧化锰纳米纤维电极材料进行表征，TEM观测结果显示这种锰材料是由许多二氧化锰纳米纤维缠绕成巢状，其纤维直径约为1nM~10nM之间；从Xrd分析表明，它是一种复合结构的锰氧化物，以钡镁锰矿为主体结构，并含有其他钠水锰矿及水羟锰矿结构。从样品电极在1MOl/llIClO4的PC-dME（1∶1）溶剂中的循环伏安曲线，可以看出在扫描的电压范围内，在3.8V和2.8V附近出现一对可逆对称的氧化还原峰，它对应于二氧化锰纳米纤维电极中锂离子的脱出-嵌入反应。通过二氧化锰纳米纤维电极在不同电流密度下的放电，可以看出该电极采用小电流放电（0.24MA/CM2），其容量可达到约190MAH/g，而且具有3V的放电平台；而在较大的电流密度（0.96MA/CM2）放电仍具有约150MAH/g的放电容量。可见，该电极具有良好的负荷特性和较高的放电容量。A novel cathode material (MnO 2) has been characterized by using transmission electron microscope (TEM) and X ray diffraction (XRD). From the TEM examination, it was found that the MnO 2 has a distinct birds nest shaped nano fiber with the diameter in the range of 1nm～10 nm. XRD data shows that the MnO 2 has a complex structure that is in the form of todorokite (3×3 tunnel) birnessite, and vernadite structure. Cyclic voltammetry has been performed in 1 mol/L LiClO 4的PC DME(1∶1) electrolyte solution. It can be seen that a pair of reversible redox peaks, which mainly occurs in the potential ranged from 2.8 to 3.8 V vs.Li/Li +, it can be described by a lithium intercalation mechanism. The galvanostatic charge discharge experiments at various current density reveal that the MnO 2 nano fiber electrodes have a high electrochemical performance and stability. The reversible capacity can reach 190 mAh/g, 150 mAh/g at lower and higher current density respectively, i.e. 0.24mA/cm 2 and 0.96mA/cm 2.国家“863”高技术发展计划课题;中国大洋矿产资源研究开发课题;国家自然科学基

Synthesis and cellular uptake mechanism of Tat decorated Au-Au_2S nanoparticles

［中文文摘］为了实现对肿瘤的靶向性药物/基因治疗,通过化学还原法制备了细胞穿膜肽Tat修饰的Au-Au2S纳米药物载体。采用透射电镜、表面增强拉曼光谱仪、紫外分光光度计对Tat/Au-Au2S纳米粒子进行表征,采用流式细胞仪、激光共聚焦显微镜研究Tat/Au-Au2S纳米粒子的穿细胞膜机制。理化分析结果表明,Tat可通过Au—S键接枝于Au-Au2S纳米粒子表面,直径约50 nm的Tat/Au-Au2S纳米粒子具有近红外敏感性。细胞内化途径示踪物共定位分析和抑制剂阻断实验表明,Tat/Au-Au2S纳米粒子以脂筏介导的巨胞饮途径进入Hela细胞,而以受体和脂筏共介导的巨胞饮途径进入骨髓间充质干细胞(BMSCs)。［英文文摘］　To realize an efficient and targeted cancer therapy by the drug/ gene carrier , cell penet rating peptide Tat decorated Au2Au2 S nanoparticles were prepared by a redox method. Transmission elect ron microscopy ( TEM) ,surface2enhanced Raman scattering ( SERS) and UV2vis spect rometer were used for characterizing Tat/ Au2Au2 S nanoparticles , and confocal laser scanning microscope (CLSM) and flow cytometer (FACS) were used to investigate the mechanism of cellular uptake. The chemicophysical result s indicate that Tat peptide could be conjugated onto Au2Au2 S nanoparticles via Au —S bonds , and Tat/ Au2Au2 S nanoparticles present as 50 nm2 diameter sphericities with NIR sensitivity. Co 2location and endocytosis inhibition experiment s suggest that Tat/ Au2Au2 S nanoparticles may enter Hela cells via a lipid raf t mediated endocytosis pathway , whereas via a combined endocytosis pathway of lipid raf t2dependent and receptor2dependent into bone marrow st romal cells (BMSCs).973计划项目(2007CB935603); 国家自然科学基金(30670559);福建省自然科学基金(2006J0121);福建省新世纪优秀人才计划项目

Development of chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate

目的研制硫酸脱氢表雄酮化学发光免疫定量检测试剂。方法利用硫酸脱氢表雄酮人工完全抗原免疫小鼠,通过杂交瘤技术制备特异性抗硫酸脱氢表雄酮单克隆抗体,采用竞争抑制法建立硫酸脱氢表雄酮化学发光免疫定量检测试剂。结果筛选获得了27株稳定分泌抗硫酸脱氢表雄酮的单克隆抗体细胞株,建立了化学发光微粒子免疫法定量测定硫酸脱氢表雄酮的试剂盒雏形,与雅培公司的硫酸脱氢表雄酮定量检测试剂在检测临床标本上的相关系数r达0.99以上。结论本研究为国产化硫酸脱氢表雄酮化学发光微粒子免疫法定量测定试剂盒的研发奠定了基础。Objective To develop chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate.Methods Mice were immunized by dehydroepiandrosterone sulfate artificial complete antigen.Monoclonal antibodies against dehydroepiandrosterone sulfate were prepared by hybridoma technique.Chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate was developed based on competitive binding method.Results 27 monoclonal antibodies were obtained.Chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate prototype kit was established.The coefficient r of testing specimens with reagent from Abbott company was over 0.99.Conclusion Development of domestic chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate reagent was laid foundation by this study.国家高技术研究发展计划(863计划)(2011AA02A101

The development of online detecting system of five-axis CNC grinding machine for indexable insert

五轴可转位刀片磨床具有高速、高精的特点,为了使所磨的刀片符合精度要求,需要针对刀片的尺寸开发一种在线检测系统。本文所介绍的在线检测系统主要由两方面构成:一是在磨床数控系统中将测头伸缩时发出的电压信号转换为测量值;二是建立刀片尺寸的加工模型。在线检测系统通过调用系统的测量宏程序,获取刀片测量值,将此测量值输入到加工模型中,得到所加工刀片的指导尺寸。通过实验,得到了刀片的指导尺寸和测量时间,验证了此在线检测系统是可行并且可靠的。The five-axis CNC grinder of indexable insert is characterized by high-speed and high-precision.,in order to meet the accuracy requirements of grinding blades, needed an online detection system developed for the size of the blade.The online detection system described in this article consists of two aspects: First, the voltage signal that when the probe telescopics will be converted to the measured value; Second, establishing the process model of the blade size.The online detection system will get the blade measurements by calling the measure macro, then the measured value input into the process model, obtaining the guidance blade size.Through the experiment, verifying this online detection system is feasible and reliable by the obtained guidance blade size and the measuring time.国家“高档数控机床与基础制造装备”科技重大专项资助(2010ZX04001-162

空气环境下退火温度对连续SiC自由膜结构与发光特性的影响

采用熔融纺膜与先驱体转化法相结合制备出连续SiC自由薄膜,研究薄膜在1300,1400,1500℃温度下空气退火处理的氧化行为,以及退火温度对薄膜微观结构、光致发光特性(PL)、硬度和电阻率的影响。结果表明,SiC薄膜在1300℃具有较佳的抗氧化和发光特性,随着退火温度的升高,薄膜的抗氧化和发光特性略有降低,薄膜中无定型SiOxCy减少,-βSiC晶粒长大及游离碳增多,薄膜表面硬度与电阻率下降,表面惰性致密氧化层的生成保护阻挡氧扩散,从而有效减缓薄膜进一步被氧化

连续含铝SiC自由膜的制备与发光特性研究

通过自制喷膜装置对聚铝碳硅烷(PACS)进行脱泡处理、熔融纺膜,并对其进行氧化交联、高温预烧及高温裂解终烧可制得连续含铝SiC自由薄膜。用扫描电镜(SEM)分析薄膜的形貌,通过红外光谱(FT-IR)分析氧化交联后薄膜的结构变化,通过电子探针(EPMA)、拉曼光谱(Raman)、X射线衍射(XRD)与场发射高分辨透射电子显微镜(HRTEM)对薄膜进行成分及微观结构分析,采用光致发光谱(PL)对薄膜的光学带隙和发光特性进行了研究。结果表明,熔融纺膜法与PACS先驱体法相结合可制得均匀、致密的耐高温连续含铝SiC自由薄膜,室温下表现出了320~440nm宽谱带发光,其发光峰可分别归因于-αSiC和C簇,且随着烧结温度的提高,发光强度增大

Development of detection kit for T cell infected with Mycobacterium tuberculosis based on fullautomatic chemiluminescence immune analyzer

目的建立基于化学发光平台的人结核感染T细胞检测方法。方法将一株γ-干扰素单抗标记在磁微粒上,另一株γ-干扰素单抗标记在吖啶酯上,然后将检测体系与已有的细胞刺激培养体系相结合。结果本研究成功建立基于化学发光平台的人结核感染T细胞检测方法。以ElISA平台检测试剂的检测结果作为参考,该方法的灵敏度为98.3%,特异性为99.2%,总体符合率达到98.8%。结论该方法具有更高的分析灵敏度(可达0.27 Pg/M l)、更宽的线性范围(1 Pg/M l~5 000 Pg/M l)、更好的重复性(批内与批间变异系数均<6.0%)及更易实现高通量检测,为临床诊断结核感染提供了有力的工具。Objective To develop the detection kit for T cell infected with Mycobacterium tuberculosis based on full-automatic chemiluminescence immune analyzer.Mehtods An anti IFN-γ Mab was coated on the surface of microparticle.Another anti IFN-γ Mab was labelled to acridinium ester.After that, the detection system was combined with the in vitro cell culture system.Results This research developed the detection kit for T cell infected with Mycobacterium tuberculosis based on full-automatic chemiluminescence immune analyzer.Compared with the testing results of the ELISA kit, the sensitivity, specificity and total matching ratio of the CLIA kit was 98.3%, 99.2% and 98.8%, respectively.Conclusion The CLIA kit has better sensitivity(0.27 pg/m L), wilder linear range(1 pg/m L ~ 5 000 pg/m L), and better repeatability(intra and inter coefficient of variation < 6.0%).It makes a high throughput detection available.It will contribute to the clinical diagnosis of Mycobacterium tuberculosis.国家高技术研究发展计划(863计划)(2011AA02A101

闽江口水、间隙水和沉积物中有机氯农药的含量

[摘要]：利用GC2ECD 和GC2MSD 对1999 年11 月闽江口水、间隙水和沉积物中的有机氯农药进行了研究. 结果显 示,闽江口水中有机氯农药的含量范围是01532～1182μg/ L ,间隙水中有机氯农药的含量为4154～1317μg/ L ,沉 积物(干重,以下讨论到的沉积物,无特别说明都是干重表示) :28179～52107μg/ kg ;与其他河口如珠江口、九龙江 口相比,闽江口的污染水平居中. 间隙水的污染物浓度普遍高于其上覆水的浓度,而沉积物中的浓度大于间隙水、 表层水,是由于有机污染物在水体中倾向于吸附在沉积物颗粒,并且通过再悬浮从底层向上迁移. 对水体中有机 氯农药各组分的含量及特征进行了分析,发现有机氯农药的主成分为:β2HCH ,DDE ,Heptachlor (七氯) ,Endosulfan Ⅱ(硫丹) ,Methoxychlor (甲氧滴涕) . DDE、β2HCH、Endosulfan Ⅱ分别占DDTs、HCHs 和硫丹的主要部分;有机氯 农药各组分间有正相关性,表明其河口有机氯农药陆源的土壤输入与相似的环境行为;对该河口的污染水平进行 了初步的评价,HCHs 符合国家海水水质一级标准,DDTs 则超过该标准.[Abstract]:The concentrations of 18 organochlorine pesticedes in water , pore water and surface sediment from Minjiang River Estuary were analyzed by GC2ECD , and confirmed by GC2MSD. The range of organochlorine pesticides was 01532～1182μg/ L at water , 4154～1317μg/ L at pore water , and 28179～52107μg/ kg at sediment . Compared with the results of other estuaries and gulfs (Pearl River Estuary , Jiulong River Estuary and so on) , it showed that the pollu2 tion of organochlorines in Minjiang was some moderate. The concentration difference in surface water , middle water , bottom water , pore water and sediment , due to the higher affinity of these hydrophobic compound for sedimentary phase than to water and a potential flux of pollutants from sediment to overlying water. The predominance ofβ2HCH ,DDE , Heptachlor , Endosulfan Ⅱand Methoxychlor in all water , pore water and sediment were clearly observed. On average , DDE、β2HCH、Endosulfan Ⅱoccupied the most part of total DDTs , HCHs and Endosulfans respectively , indicated the fate of these parent compounds or congeners. At the same time , it was found that thepositive relationship among the in2 dividual organochlorine components (HCHs , DDTs and Endosulfans) , which indicated that the similar of the source and behavior for organochlorine pesticides.海洋环境科学教育部重点实验室开放基金与教育 部重点基金联合资

Preparation and properties of nano-structured α-MnO_2 as electrode material of supercapacitor

[中文文摘]用KMnO4和MnSO4水溶液作为原料,用液相沉淀法制备无定形-αMnO2.nH2O。对样品进行比表面积测定(BET)、XRD、SEM等测试。通过循环伏安法和恒流充放电测试研究了样品的电化学行为。合成的无定形-αMnO2.nH2O在0.5mol/L的Na2SO4电解液中,在0~0.9 V(vs.SCE)范围内,电流为10 mA,2 mV/s的扫描速度下的比电容可达126.4 F/g。无定形-αMnO2.nH2O是较好的超级电容器电极材料。[英文文摘]Amorphous α-MnO_2·nH_2O was synthesized with chemical coprecipitation method by using KMnO_4 and MnSO_4(aqueous) solution as raw materials.The sample was characterized by BET,XRD and SEM.The electrochemical characteristics of the sample were characterized by CV and constant current charge-discharge tests.The specific capacitance of the amorphous α-MnO_2·nH_2O was 126.4 F/g in 0.5 mol/L Na_2SO_4 electrolyte at the scan rate of 2 mV/s,the current of 10 mA,in the range of 0～(0.9 V)(vs.SCE).The amorphousα2MnO2·nH2O was an excellent electrode material for supercapacitor.973项目(2002CB211800); 国家自然科学基金(20373058); 福建省科技项目(2003H044)

先驱体法制备连续SiC自由薄膜及其发光性能

以聚碳硅烷(polycarbosilane,PCS)为先驱体,熔融纺出连续PCS自由原膜,并在190℃下对其进行1,2,3h和6h氧化交联,在900℃预烧及最终分别在1200℃和1300℃烧成,制得系列SiC自由薄膜。采用红外光谱、Raman光谱、X射线衍射、透射电镜与扫描电镜对薄膜进行微观结构与形貌分析。测量了薄膜的室温光致发光特性。结果表明:连续SiC自由膜均匀致密,含有β-SiC微晶、无定形SiOxCy及C簇;薄膜在410～450nm范围内有较强的蓝光发射,1200℃烧结的薄膜随交联时间增加,发光强度增大;而1300℃烧结的薄膜的发光强度相对下降,且交联时间越长强度下降越明显。412nm发光峰可归结于C簇发光;而435nm附近的峰则是薄膜中富含的Si—O,Si—C等键中的缺陷态构成的发光中心,在β-SiC晶粒中电子受到激发与缺陷态产生辐射复合引起发光以及量子表面效应共同作用的结果