Shouting Huang2013-01-01Open Scholarship Institutional Repository (Washington University in St. Louis)
Reduced-dimensional materials have attracted tremendous attention because of their new physics and exotic properties, which are of great interests for fundamental science. More importantly, the manipulation and engineering of matter on an atomic scale yield promising applications for many fields including nanoelectron…
Advanced Thermoelectric Materials and DevicesZnO doping and propertiesAdvanced Semiconductor Detectors and Materials
毕淑芝、王继伟、Di Wu 等 4 位作者2013-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
介绍了采用EBT电炉-LF精炼炉.VD真空炉-CC连铸流程生产的GCr15轴承钢生产工艺及产品质量现状。重点通过控制电炉出钢终点ω[C];LF扩散脱氧、全程控制舢含量、优化精炼渣系;VD真空脱气及软吹氩搅拌;连铸氩气保护浇注等工艺措施,对GCr15钢的生产工艺进行优化,实现了低氧高纯净钢的冶炼,提高了钢水洁净度和可浇铸性,钢中全氧含量控制在12×10。以下,平均8×10^-6,最低5×10^-6,夹杂物最高级别A类1.5-B类1.0-C类0.5-D类0.5级。解决了GCr15钢连铸水口结瘤问题,连浇炉数达到了中间包耐材极限承受能力,实现了20连浇。
Medical Research and TreatmentsEducational Reforms and InnovationsMetallurgy and Material Science
张梦萌、颜红侠、管兴华 等 4 位作者2013-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
采用硅烷偶联剂表面处理过的纳米二氧化硅(nano—SiO2)作为填料改性超支化聚硅氧烷/氰酸酯(HBPSi/CE)树脂体系。结果表明:适量的nano—SiO2既可同时提高HBPSi/CE树脂的韧性和强度,又可改善其耐水性能;当nano—SiO2质量分数为3.0%时,nano—SiO2/HBPSi/CE体系的冲击强度(14.1kJ/m2)和弯曲强度(118.4MPa)分别比HBPSi/CE树脂提高了26%和12%,其吸水率低于HBPSi/CE树脂,介电常数略高于HBPSi/CE树脂,介电损耗角正切与HBPSi/CE树脂相当。
Supercapacitor Materials and FabricationConducting polymers and applications
Quincy Jay Garner2013-01-01OpenAlex
Since the advent of the Information Age, there has been an ever growing demand to continually shrink and reduce the cost of semiconductor products. To meet this demand, a great amount of research has been done to improve our current micro/nano manufacturing processes and develop the next generation of semiconductor fa…
Nonlinear Optical Materials StudiesGold and Silver Nanoparticles Synthesis and ApplicationsLaser-Ablation Synthesis of Nanoparticles
钟朋展、Fanhui Meng、崔晓曦 等 5 位作者2013-01-01化工进展
以3种不同镍盐(硝酸镍、乙酸镍和氯化镍)为前体,采用等体积浸渍法制备了双金属Ni-Fe/γ-Al2O3催化剂,分别记作Ni-Fe-N、Ni-Fe-Ac和Ni-Fe-Cl,在浆态床反应装置上对各催化剂CO甲烷化催化活性进行评价。结果表明,Ni-Fe-N甲烷化催化活性最高,CO转化率、CH4选择性分别为97.2%和87.3%;而Ni-Fe-Cl甲烷化催化活性最低,CO转化率、CH4选择性分别为47.3%和58.7%。通过XRD、H2-TPR和CO-TPD等表征技术探讨了催化剂的微观结构与甲烷化催化活性之间的关系,发现Ni-Fe-N甲烷化活性高的原因是NiO晶粒小、分散好,Ni与Fe之间具有较好的协同作用,并且CO吸附量大。
Catalysts for Methane ReformingCatalysis and Hydrodesulfurization StudiesCatalytic Processes in Materials Science
章国栋2013-01-01染料与染色
2,4-二羧基苯甲醛与N,N-二乙基间羟基苯胺在酸性介质中缩合,产物在溶剂中脱水,再经氧化得到原染料。原染料经过纳滤膜脱盐及盐置换处理,喷雾干燥,最终制得新型喷墨染料C.I.酸性红388。对脱水用溶剂进行回收,实现清洁生产。
Polymer Science and PVCMagnesium Oxide Properties and ApplicationsChemical Synthesis and Reactions
李艳红、赵丽、张永明 等 5 位作者2013-01-01材料热处理学报
采用传统熔融法制备了系列Eu3+掺杂的SiO2-Al2O3-CaO—CaF2-NaF—Eu2O3氟氧化物基质玻璃。通过优化组分和热处理温度,获得Eu^3+掺杂的CaF2的微晶玻璃。用差热分析(DTA),X射线衍射(XRD)、电子扫描电镜(SEM)和荧光光谱等对样品进行了分析。结果表明,基质玻璃经650℃热处理1h后获得了Eu^3+掺杂的CaF2的微晶玻璃,CaF2晶粒尺寸约为21nm。与基质玻璃相比,微晶玻璃中^5D0→^7F2发射强度和激发强度增强,Eu^3+离子局域对称环境降低。
Glass properties and applicationsFlame retardant materials and propertiesLuminescence Properties of Advanced Materials
梁英华、Wenquan Cui、刘利 等 4 位作者2013-01-01功能材料
采用硬脂酸法合成Ag掺杂的K2La2Ti3-xAgxO10复合催化剂,并通过微波辅助法进行酸交换、胺柱撑、离子交换以及硫化等步骤制备了CdS插层的K2La2Ti3-xAgxO10。利用X射线粉末衍射(XRD)、场发射扫描电子显微镜(SEM)、X射线能谱仪(EDX)、紫外-可见漫反射吸收光谱(UV-Vis)和光致发光光谱(PL)等技术对催化剂进行表征,考察了催化剂的光催化制氢活性。结果表明,Ag离子掺杂和CdS插层的协同作用拓展了催化剂的可见光吸收范围,提高了光催化活性,催化剂在可见光照射3h的产氢量为3.27mmol/(g.cat)。
TiO2 Photocatalysis and Solar CellsLayered Double Hydroxides Synthesis and ApplicationsPigment Synthesis and Properties
蒋远霞、潘晶、刘新才 等 4 位作者2013-01-01功能材料
采用铜模吸(或喷)铸制备Re2Fe14B/Fe3B型纳米复合块状永磁体是一种短流程、近净成型的新方法。对该技术方法的研究涉及两种工艺途径:(1)首先利用铜模吸(或喷)铸方法制备出完全非晶块体,随后通过晶化热处理得到纳米晶块体;(2)利用铜模吸(或喷)铸方法直接制备纳米晶块体。在铜模吸(或喷)铸工艺所提供的亚快速冷却条件下,人们一直致力于通过调整合金成分来改善Re2Fe14B/Fe3B型合金的玻璃形成能力(glass-forming ability,GFA)、微观结构和磁性能。对近期这方面的研究进行了综述。
Metallic Glasses and Amorphous AlloysMicrostructure and mechanical propertiesMetallurgical and Alloy Processes
童义平、陈腾2013-01-01光谱学与光谱分析
采用高温固相法合成YAG:Ce^3+发光材料。用正交试验法设计实验,确定Ce^3+掺杂量、焙烧温度、焙烧时间的最佳条件。研究结果发现:(1)荧光粉发光强度的影响因素排列顺序是:焙烧温度〉焙烧时间〉Ce离子掺杂量。其中焙烧温度的影响最为关键,其次是焙烧时间的影响,而Ce离子掺杂量的影响较小。(2)用高温固相法制备YAG:Ce^3+荧光粉的最佳工艺参数为:焙烧温度1600℃,Ce离子掺杂量0.10mol,焙烧时间4h,即氏B5C3组合。依此条件,合成的荧光粉发光最好。另一个最优组合是:焙烧温度1600℃,Ce离子掺杂量0.08mol,焙烧时间4h,即氏B4C3组合。依此条件,合成的荧光粉发光也很好,但稍弱于氏B5C3组合。对合成YAG…
Solid State Laser TechnologiesLuminescence Properties of Advanced MaterialsRadiation Detection and Scintillator Technologies
Sharil Patrale2013-01-01OpenAlex
The objective of this research is to synthesize structural composites designed with particular areas defined with custom modulus, strength and toughness values in order to improve the overall mechanical behavior of the composite. Such composites are defined and referred to as 3D-designer composites. These composites w…
Advanced Materials and MechanicsComposite Material MechanicsCarbon Nanotubes in Composites
孙志宽2013-01-01环境与可持续发展
燃煤电厂氮氧化物(NOx)防治一般采用低氮燃烧器(LNB)+选择性催化还原(SCR)的技术路线,为满足现行排放标准,如何分配LNB和SCR的“出力”,存在一个最佳的技术投资方案。本文通过建模研究,创新性地提出了燃煤电厂低氮燃烧器改造的“经济浓度”概念,据此进行LNB和SCR的设计,可使改造方案达到最佳环境效益与经济目标。
Catalytic Processes in Materials ScienceAmmonia Synthesis and Nitrogen ReductionIndustrial Gas Emission Control
Wang Xu、常素芹、冯钠 等 4 位作者2013-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
分别采用一段和两段模压法制备了以顺丁橡胶(BR)/丁苯橡胶(SBR)/天然橡胶(NR)为基体的橡胶发泡材料,研究了三种化学发泡剂N,N'-二甲基戊次甲基四胺(H)、4,4'-氧代双(苯磺酰肼)(OBSH)以及H/OBSH(质量比1:1)复配对发泡及硫化特性的影-向,以及3种发泡剂和2种成型工艺对收缩率及相结构的影响。结果表明,发泡剂H对硫化性能影响最大,含发泡剂H的混炼胶在分解过程中释放的热量最多;加入3种发泡剂都具有一种较大的泡孔镶嵌在较小的泡孔丛中的泡孔形态;密度和线收缩率均随着时间的增加而增加,经H/OBSH复配的发泡剂更适合该体系成型,材料线收缩率均比单独使用H和OBSH小,两段模压法可以有效地提高发泡材料的尺寸稳定性,收…
Polymer composites and self-healingPolymer Foaming and CompositesPolymer Nanocomposites and Properties
杨学灵、林瑛、杨雪珠 等 5 位作者2013-01-01广州化学
提出一种前处理简单、操作方便、灵敏度高的测定电镀液中Cr(VI)NCr(IIll的分析方法。先用原子吸收光谱法检测电镀液的总铬含量,然后用离子色谱法检测Cr(VI)的总量,由两者的差值得出Cr(III)的含量。原子吸收光谱法检测铬的加标回收率为97.3%~99.5%,检出限(3S/D)为0.01mg/L。离子色谱法检测Cr(VI)N;~标回收率为92.2%~102.2%,检出限(3S/D)为O.05mg/L。
Electrochemical Analysis and ApplicationsAnalytical Chemistry and SensorsCorrosion Behavior and Inhibition
梁多平、智慧、孙智慧 等 7 位作者2013-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
采用异丙基三(二辛基焦磷酸酰氧基)钛酸酯偶联剂对纳米羟基磷灰石(HA)改性,再与聚乳酸(PLA)/聚(3-羟基丁酸酯.co-4-羟基丁酸酯)(PHA)熔-融共混法制备PLA/PHA/HA纳米复合降解材料。利用流变仪对其流变行为进行了研究。结果表明,PLA/I}HA基体在没有添加钛酸酯偶联剂和纳米HA时,基体储存模量G’和复数黏度日”随温度升高而逐渐降低;纯的纳米HA的加入可以提高PLA/PHA基体的储存模量G’和损耗模量G”,然而,PLA/PHA/HA纳米复合降解材料引入钛酸酯偶联剂反而会使储存模量G’和损耗模量G”降低。当过量引入钛酸酯偶联剂会明显降低体系线性一非线性转变的临界应变。在190℃,PLA/PHA基体加入纯的纳米HA…
Polymer composites and self-healingBone Tissue Engineering Materialsbiodegradable polymer synthesis and properties
苏明如、王志兴、李新海 等 5 位作者2013-01-01Acta Scientiarum Naturalium Universitatis Sunyatseni
以Ti(OC4H9)4、Li(CH3COO).2H2O、Al(NO3).9H2O和NH4H2PO4为原料,采用溶胶-凝胶法合成Li1.3Al0.3Ti1.7(PO4)3粉体,并研究热处理温度对粉体结构的影响。通过X射线衍射仪(XRD)、扫描电镜(SEM)和电化学阻抗谱(EIS)对制备粉体的结构与性能进行表征。结果表明:溶胶凝胶法可合成纯相LATP粉体,降低热处理温度,且粉体结晶性良好,粒径小于1μm,室温下电导率为1.32×10^-3 S/cm,673 K时电导率达到8.94×10^-2 S/cm,473~673 K下活化能为31.55 kJ/mol。
Conducting polymers and applications
Gang Feng、蔡李鹏、祁晓婷 等 5 位作者2013-01-01化学与生物工程
以二氧化铀、2。5-吡啶二羧酸为原料.采用回流法合成了配合物U(C7H3NO4)3(C7H6NO4)4·3H2O,并对其进行了红外光谱、紫外光谱、元素分析及电化学性质分析等表征。循环伏安结果表明,该配合物有两对氧化还原峰,电子转移发生在电对U( Ⅵ )/U( Ⅴ )和U( Ⅴ )/U( Ⅳ )。配合物U(C7H3NO4)3(C7H6NO4)4·3H2O具有良好的氧化还原电化学性能。
Radioactive element chemistry and processingRadiopharmaceutical Chemistry and ApplicationsNuclear Materials and Properties
Amir Parsian2013-01-01Diva portal (Dalarna University Library)
In many metal cutting operations, the relative displacement between the tool and the workpiece, determines the surface finish and the dimensional quality of the product. In an unstable operation, this relative displacement becomes bigger in an uncontrolled way and affects the cutting process. Vibrations of machine-too…
Advanced Surface Polishing TechniquesMetal Alloys Wear and PropertiesAdvanced machining processes and optimization
Olumide I. Adebolu2013-01-01OpenCommons at University of Connecticut (University of Connecticut)
This dissertation focuses on identification and development of new methodologies in complex polymer synthesis in relation to the living ring opening polymerization (LROP) of cyclic esters and controlled radical polymerization (CRP) of main chain fluorinated monomers.\nThe use of Cp2ZrHCl was evaluated as a milder rout…
Fluorine in Organic ChemistrySynthesis and properties of polymers
Thushanthi D. A. A. Senadheera2013-01-01Libraries and Cultural Resources (University of Calgary)
Accurate measurement of hydrogen in steels is one of the greatest challenges in the field of applied science. Even though research on hydrogen in steels has been carried out over the last ten decades, very little progress has been made in fundamental areas because of the lack of a reliable method for measuring hydroge…
Nuclear Materials and PropertiesHydrogen embrittlement and corrosion behaviors in metalsWelding Techniques and Residual Stresses