聚3-辛基噻吩修饰纳米硫化锌的合成与性质研究

基于半导体硫化锌的光电转换性能改善,采用硫代乙酰胺沉淀法制备了粒径2.6 nm的纳米级硫化锌,并用聚3-辛基噻吩(P3OT)对其进行了表面修饰.通过红外光谱(IR)、粉末X-射线衍射(XRD)、热场发射环境扫描电子显微镜(SEM)、紫外吸收光谱(UV-Vis)等多种手段对表面有机修饰纳米硫化锌晶体进行了表征.     

NiO纳米粉体的液相沉淀法制备

以NiCl2和NaOH为原料，乙醇为分散剂，采用液相沉淀法制备出翠绿色前驱体，经正戊醇共沸去除水分、400℃焙烧后制得分散性好的NiO粉体。透射电镜检测表明，平均粒径12nm；经X-射线分析确定其为立方相晶体。     

聚苯乙烯/Co3O4复合纳米粒子的制备与表征

在非离子表面活性剂T riton X-100水溶液中制得Co3O4磁性纳米粒子,将其与苯乙烯在阴离子表面活性剂十二烷基苯磺酸钠(SDBS)溶液中引发聚合,制得聚苯乙烯/Co3O4复合纳米粒子.根据透射电镜(TEM)观察,Co3O4纳米粒子的粒径在15 nm左右,复合纳米粒子的粒径在30 nm左右,高效液相色谱法(HPLC)测定复合纳米粒子的分子质量为1.25×105~5.30×105g.m o-l 1.X-射线衍射(XRD)、红外光谱(IR)及磁性能测定表明,聚苯乙烯对Co3O4纳米粒子的包裹是成功的.     

铋(Ⅲ)-8-羟基喹啉配合物的合成、晶体结构及荧光性质

在乙醇体系中,由硝酸铋和8-羟基喹啉(HQ)反应,合成了[Bi(NO_3)Q_2]·H_2O铋(Ⅲ)-8-羟基喹啉配合物.用元素分析、红外光谱、粉末X-射线衍射和单晶X-射线衍射对配合物进行了表征和结构分析.单晶X-射线衍射分析结果表明,该配合物属于单斜晶系,C2/c空间群,a=2.445 04(13)nm,b=0.819 6(4)nm,c=2.071 8(10)nm,β=118.406(5)°,V=3.651 9(3)nm3,Z=8,F(000)=2 192,μ(Mo Kα)=9.698 mm-1.测定了配体、标题配合物及铕掺杂(摩尔分数:5%,10%,15%,20%)配合物的荧光光谱,结果表明,无论是标题配合物还是铕掺杂的配合物均显示配体的荧光,既没有铋离子的特征发射,也没有铕离子的特征发射.说明配合物的荧光是配体的荧光;而配合物的荧光强度大于配体,说明金属离子对配体的荧光有敏化作用.     

变形六方ZnS纳米晶的固相合成及其荧光特性

以硫化钠与醋酸锌为原料，采用改进的室温（湿）固相合成法制备硫化锌纳米晶，用TEM，XRD，UV，PL等方法研究了硫化锌纳米晶粒径、结构与荧光特性。结果表明，硫化锌纳米晶平均粒径约4.0nm，为六方结构。所制备的样品在400－450nm波段出现强荧光发射，并有光谱分裂现象。光谱分裂的原因可能是乙醇对纳米微粒的表面修饰作用、微量杂质的影响以及小尺寸效应的结果。     

基于Lys-AuNPs@ZIF-8纳米复合材料比率荧光检测Hg2+

采用一锅法合成了包裹溶菌酶作配体的金纳米颗粒(Lys-AuNPs)的ZIF-8(Lys-AuNPs@ZIF-8)纳米复合材料,用于水溶液中Hg²⁺的检测.通过傅里叶红外光谱(FT-IR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、粉末X-射线衍射(XRD)、氮气吸脱附等技术对其结构进行表征.该纳米复合材料粒径大小为300～500 nm,具有良好的水溶性、分散性及荧光稳定性.加入Hg²⁺后,AuNPs在640 nm处的荧光发射峰荧光强度减弱,而Lys在4     

NiO纳米粉体的液相沉淀法制备

以NiCl2和NaOH为原料,乙醇为分散剂,采用液相沉淀法制备出翠绿色前驱体,经正戊醇共沸去除水分、400 ℃焙烧后制得分散性好的NiO粉体.透射电镜检测表明,平均粒径12 nm;经X-射线分析确定其为立方相晶体.     

NiO纳米粉体的液相沉淀法制备

以NiCl2和NaOH为原料,乙醇为分散剂,采用液相沉淀法制备出翠绿色前驱体,经正戊醇共沸去除水分、400 ℃焙烧后制得分散性好的NiO粉体.透射电镜检测表明,平均粒径12 nm;经X-射线分析确定其为立方相晶体.     

等离子显示用稳定发光BaMgAl10O17:Eu2+荧光粉的制备及其性能

利用微乳液—共沉淀高温法制备出了掺杂Eu2 摩尔比为10%的BaMgAl10O17:Eu2 (BAM)蓝色发光荧光粉。X-射线衍射(XRD)图谱分析表明所得粉体为单一相;场发射扫描电镜(FE-SEM)照片及粒度分布测试均显示其粒径在2μm左右;真空紫外光辐射下的发光光谱(VUV-PL)显示所得粉体在147及172 nm处有较强的真空紫外吸收,172 nm光激发下的粉体在450 nm处呈现强的宽带发射;单指数拟合后的荧光寿命是1.03μs;最大内量子效率值为0.87±0.04;色坐标(x=0.144,y=0.063)显示所得粉体发光位于标准蓝色区;高温及真空紫外光照射劣化试验表明,利用该方法制备的BAM更稳定、更适合于等离子显示的应用。     

氧化铝-氧化锆纳米复合颗粒的制备及表征

在水/辛烷基苯酚聚氧乙烯醚(Triton X-100)/正丁醇/环己烷组成的微乳液体系中,制备并表征了氧化铝-氧化锆纳米复合颗粒.用动态光散射法研究了温度、水与表面活性剂的物质的量比、反应物的浓度等反应条件对Al(OH)3-Zr(OH)4颗粒平均粒径以及粒度分布的影响.分别用透射电镜、X射线衍射、红外以及热分析表征60℃真空干燥和500,1200℃热处理后的粉末,表明60℃真空干燥后,粉末以无定形为主;500℃时粉末粒径为5 nm左右,主要是t-ZrO2,Al2O3以固熔体形式存在;1200℃时粉末粒径为200 nm左右,是t-ZrO2,m-ZrO2,α-Al2O3共存.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that