Synthesis, Characterization and Properties Studies of Alkylated Graphene and Graphene Quantum Dots

石墨烯自被发现并报道以来，因其独特的结构和优异的物理化学性质成为物理、化学、材料科学等领域研究的热点。然而已有的制备方法中石墨烯的产率和产量都不尽如人意，合成得到的石墨烯也很难分散在一般的溶剂中，极大地限制了石墨烯在实际领域的应用。因此，发展一种可分散、高质量石墨烯的制备方法成为相关领域中的一个重点和难点课题。此外，纯的石墨烯是零带隙半导体，因此不会有光致发光现象，大大限制了它在光电器件中的应用。最近研究发现，当石墨烯的宽度小于10nm后，由于量子限域效应和边界效应的影响，得到的石墨烯纳米带或石墨烯量子点能够表现出半导体特性。这一发现突破了二维石墨烯材料本身的限制，激起了科学家对石墨烯纳米带和...Graphene has attracted enormous attention over the past few years due, in part, to the remarkable electrical, mechanical, and thermal properties of this new material. However, low yield and throughput remain limiting factors in producing large quantities of materials needed for many practical applications, such as capacitors, fuel cells, catalysts, and sensors. In addition, graphene materials prod...学位：理学硕士院系专业：化学化工学院_无机化学学号：2052011115154

参政党民主监督的政治机理及运行机制

民主监督是保障中国民主政治健康发展的基本手段和环节。参政党民主监督是中国政治监督体系的重要组成部分,也是中国共产党领导的多党合作和政治协商制度的内在机制,反映了中国特色社会主义民主政治发展的客观要求;其蕴含的内在政治机理,体现了中国政党相互监督的制度特点和优势及中国政治监督体系的多层次性;而其民主监督的政治功能产生实效的关键则取决于规范监督行为并落到实处的外部运行机制。国家社会科学基金项目“科学发展观对人类社会发展规律认识的新贡献研究”(11BKS010); 厦门大学哲学社会科学繁荣计划项目“中国发展道路的理论与实践研究”(2013-201720132017

Charge Transport Performance of Nafion-based Redox Polymer in Atmosphere

利用三明治电池和伏安法测试了不同制备条件的Nafion基氧化还原聚合物膜在空气中的电荷传输性能.研究结果表明,混合适量聚乙二醇(PEG)的Nafion基金属联吡啶配合物｛Nafion[M(bpy)23+,PEG](M=Ru,Fe)｝膜的表观电荷传递扩散系数(Dct)达到10-6-10-7cm2·s-1,电子或空穴迁移率(μ)达到10-4-10-5cm2·V-1·s-1.在导电玻璃(ITO)电极与Nafion基氧化还原聚合物膜界面引入一层导电聚苯胺(PANI)后,降低了其接触电阻,使氧化还原聚合物膜的Dct提高至10-5-10-6cm2·s-1,μ提高至10-3-10-4cm2·V-1·s-1,且工作电流提高了近两个数量级.该固态氧化还原聚合物膜的性能比较稳定,在空气中放置30天后其Dct和μ降低得很少.The charge transport performance of the Nafion-based redox polymer films prepared under different conditions was investigated by cyclic voltammetry in the sandwiched cells.The results showed that the apparent charge transfer diffusion coefficient(Dct)of the Nafion[M(bpy)2+3,PEG(polyethylene glycol)](M=Ru or Fe)films is about 10-6-10-7 cm2·s-1 and the mobility of the electron or hole(μ)was about 10-4-10-5 cm2·V-1·s-1.In order to decrease the resistance of the interface,a polyaniline(PANI)layer was added to the interface of indium tin oxide coated conducting glass(ITO)electrode and the redox polymer.Consequentially,the Dct could be increased to about 10-5-10-6 cm2·s-1 and μ to about 10-3-10-4 cm2·V-1·s-1,and the operating current of the cells under 600 mV bias could be increased by almost 100 times.In addition,the Dct and μ of this redox polymer film had just reduced slightly after 30 d kept in atmosphere.Therefore,the redox polymer film is sufficiently stable.国家自然科学基金(20373057)资助项

系统性红斑狼疮患者骨髓基质细胞因子表达及对免疫功能的影响

【目的】研究系统性红斑狼疮（SLE）患者骨髓基质细胞因子表达情况,及其对外周血淋巴细胞增殖反应的影响,探讨SLE的发病机制。【方法】采用ELISA方法观察SLE患者骨髓基质细胞培养液IL-6、MIP-1、IFN-γ、TGF-β等细胞因子的表达,采用四甲基偶氮唑盐比色法（MTT）,观察基质细胞培养上清液对外周血淋巴细胞增殖反应的影响。【结果】SLE患者骨髓基质细胞培养液IL-6、MIP-1、IFN-γ浓度明显增高,TGF-β则降低,3种细胞因子与SLEDAI评分相关;正常人及SLE患者骨髓基质细胞上清液均对刀豆蛋白A诱导的外周血淋巴细胞增殖有明显的抑制作用,而SLE患者的上清液抑制作用明显低于正常人;在分别加入抗MIP-1、抗IFN-γ单抗后,骨髓基质细胞上清液对外周血淋巴细胞增殖的抑制作用明显增强,而加入抗TGF-β单抗后,抑制作用明显减弱。【结论】SLE患者骨髓基质细胞对外周血淋巴细胞增殖的抑制作用较弱,与其部分细胞因子异常表达有关,骨髓基质细胞可能与SLE的发病、发展有一定关系

Charge transport performance of Nafion-based redox polymer in atmosphere

The charge transport performance of the Nafion-based redox polymer films prepared under different conditions was investigated by cyclic voltammetry in the sandwiched cells. The results showed that the apparent charge transfer diffusion coefficient(D-a) of the Nafion[M(bpy)(3)(2+), PEG (polyethylene glycol)] (M=Ru or Fe) films is about 10(-6)-10(-7) cm(2) . s(-1) and the mobility of the electron or hole (mu) was about 10(-4)-10(-5) cm(2) . V-1 . s(-1). In order to decrease the resistance of the interface, a polyaniline (PANI) layer was added to the interface of indium tin oxide coated conducting glass (ITO) electrode and the redox polymer. Consequentially, the D-a could be increased to about 10(-5)-10(-6) cm(2) . s(-1) and mu to about 10(-3)-10(-4) cm(2) . V-1 . s(-1), and the operating current of the cells under 600 mV bias could be increased by almost 100 times. In addition, the D-a and mu of this redox polymer film had just reduced slightly after 30 d kept in atmosphere. Therefore, the redox polymer film is sufficiently stable

Facile and straightforward synthesis of superparamagnetic reduced graphene oxide–Fe3O4 hybrid composite by a solvothermal reaction

E-mail Addresses: [email protected] superparamagnetic reduced graphene oxide-Fe3O4 hybrid composite (rGO-Fe3O4) was prepared via a facile and straightforward method through the solvothermal reaction of iron (III) acetylacetonate (Fe(acac)(3)) and graphene oxide (GO) in ethylenediamine (EDA) and water. By this method, chemical reduction of GO as well as the formation of Fe3O4 nanoparticles (NPs) can be achieved in one step. The Fe3O4 NPs are firmly deposited on the surfaces of rGO, avoiding their reassembly to graphite. The rGO sheets prevent the agglomeration of Fe3O4 NPs and enable a uniform dispersion of these metal oxide particles. The size distribution and coverage density of Fe3O4 NPs deposited on rGO can be controlled by varying the initial mass ratio of GO and iron precursor, Fe(acac)(3). With an initial mass ratio of GO and Fe(acac)(3) of 5:5, the surfaces of rGO sheets are densely covered by spherical Fe3O4 NPs with an average size of 19.9 nm. The magnetic-functionalized rGO hybrid exhibits a good magnetic property and the specific saturation magnetization (M-S) is 13.2 emu g(-1). The adsorption test of methylene blue from aqueous solution demonstrates the potential application of this rGO-Fe3O4 hybrid composite in removing organic dyes from polluted water.National Key Basic Research Program of China 2013CB933901 National Natural Science Foundation of China 21171140 21021061 21031004 U1205111 Fundamental Research Funds for the Central Universities 2011121013 2012121020 NFFTBS J103041

Propagative Exfoliation of High Quality Graphene

通讯作者地址: Deng, SL (通讯作者) Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China. [email protected]; [email protected] quality graphene materials that readily disperse in water or organic solvents are needed to achieve some of the most ambitious applications. However, current synthetic approaches are typically limited by irreversible structural damages, little solubility, or low scalability. Here, we describe a fundamental study of graphene chemistry and covalent functionalization patterns on sp(2) carbon lattices, from which a facile, scalable synthesis of high quality graphene sheets was developed. Graphite materials were efficiently exfoliated by reductive, propagative alkylation. The exfoliated, propagatively alkylated graphene sheets (PAGenes) not only exhibited high solubility in common solvents such as chloroform, water, and N-methyl-pyrrolidone, but also showed electrical conductivity as high as 4.1 X 10(3) S/m, which is 5 orders of magnitude greater than those of graphene oxides. Bright blue photoluminescence, unattainable in graphene, was also observed. We attribute the rise of blue photoluminescence in PAGenes to small on-graphene sp(2) domains created by the propagative covalent chemistry, which may expand from graphene edges or existing defect sites leaving sp(2)-hybridized patches interlaced with sp(3)-hybridized regions. The intact sp(2) domains enable effective electrical percolation among different graphene layers affording the observed high electrical conductivity in PAGene films.National Key Basic Research Program of China 2013CB933901 National Natural Science Foundation of China 21171140 21021061 21031004 U1205111 Natural Science Foundation of Fujian Province of China 2013J01056 Fundamental Research Funds for the Central Universities University of Maryland U.S. National Science Foundation CAREER CHE-105551

齿条类刀具展成加工修形齿廓的理论设计

采用数控机床进行修形齿廓加工前通常还需加工特定的修形刀具，增加了刀具的加工成本。为此，进行了基于标准齿条类刀具展成加工修形齿廓的理论研究。基于齿廓修形方程和轮齿接触分析理论，推导了齿条刀具与齿轮在修形加工阶段、渐开线啮合阶段以及空啮合过渡阶段的传动误差方程，并给出了齿条类刀具在数控加工过程中的位置及速度控制方程。所模拟的齿廓形状参数与齿廓的理想设计值一致。提出的齿廓修形方法可有效指导齿条类刀具进行齿轮齿廓的数控加工修形