哌嗪为结构导向剂的Ω沸石合成规律研究

研究了水热体系下以哌嗪为模板剂的Ω沸石的合成规律,并与传统合成Ω沸石的模板剂四甲基氢氧化铵(TMAOH)进行了比较.实验结果表明:在Ω沸石的合成体系中,两种模板剂的结构导向作用不尽相同,在100 ℃哌嗪没有结构导向作用,在150 ℃才能够合成Ω沸石.而TMAOH的作用恰好相反,在100 ℃就能够合成Ω沸石,在150 ℃仅能够合成ANA沸石.用哌嗪做模板剂,所合成样品的相对结晶度高于用TMAOH合成的样品.     

具有纳米质点性质的MFI型硅沸石微细晶粒的合成及表征(英)

分别以白炭黑（Ⅰ）和硅溶胶（Ⅱ）为硅源，在（TPA）2O－Na2O－SiO2－H2O体系（TPA为四丙基铵）中，反应温度为60℃，合成了高结晶度纯硅沸石．用扫描电子显微镜（SEM）法测得的晶粒大小分别为0．20μm（Ⅰ）和0．45μm（Ⅱ）；用粉末X射线衍射（XRD）线宽法测得的晶粒大小为0．02μm．与高温（180℃）合成的硅沸石样品相比较，低温合成的微细晶粒硅沸石样品已具备纳米级材料的若干特性．微细晶粒硅沸石的正己烷吸附量和比表面都非常大．XRD谱，红外吸收光谱（FT－IR），29Si魔角固体核磁共振（29SiMASNMR）和热重分析（TG／DTG／DTA）的研究证明，微细晶粒硅沸石的结构破坏温度和单斜／正交对称性相转变温度明显地比高温合成的硅沸石低，硅羟基缺陷也明显地增加．0．20～0．45μm的微细晶粒硅沸石的比表面几乎与胶体质点相同，它的外表面积达100m2／g，中孔容积为0．10～0．12ml／g，平均孔径为2．6～2．7nm．这表明微细晶粒硅沸石实际上是纳米质点的结合体．     

具有纳米质点性质的MFI型硅沸石微细晶粒的合成及表征

分别以白炭黑和硅溶胶为硅源，在（ＴＰＡ）２Ｏ－Ｎａ２Ｏ－ＳｉＯ２－Ｈ２Ｏ体系中，反应温度为６０℃．，合成了高结晶度纯硅沸石，用扫描电子显微镜法测得的晶业大小分别为０．２０μｍ和０．４５μｍ；用粉末Ｘ射线衍射线宽法测得的晶粒大小为０．０２μｍ。与高温合成的硅沸石样品相比较，低温合成的微细晶粒硅沸石样品已具备纳米级产若干特性。     

超顺磁中空碳胶囊的合成及其载药性能研究

利用聚苯乙烯-丙烯酸（PSA）共聚物胶粒为模板,采用控制沉降和原位聚合的方法首先合成PSA@Fe2O4／聚砒咯（PPy）复合核壳粒子;将去核后得到的Fe3O4／PPy空心胶囊进一步热解炭化,制备了单分散Fe3O4／Carbon空心胶囊．样品物相及结构经X射线衍射仪（XRD）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）表征．超导量子干涉仪（SQUID）测定结果显示,碳胶囊样品呈超顺磁性．N2气吸附测试结果显示磁性碳胶囊的比表面积BET为98m^2／g．以Fe3O4／Carbon磁性空心胶囊对抗癌药物阿霉素进行负载后,体外模拟释放实验结果显示胶囊具有良好的药物缓释性能．     

沸石膜的合成及渗透气化特性的研究

报道了以硅沸石（Ｓｉｌｉｃａｌｉｔｅ）为原料，添加结晶模板剂ＴＰＡＢｒ（４－ｎ－丙基溴铵）以及碱源（ＮａＯＨ）等，利用水热合成法成功地合成了高硅含量、疏水性硅沸石膜．同时探讨了硅沸石膜对各种含醇水溶液的渗透气化分离特性．研究结果表明：对乙醇／水溶液，供给液乙醇浓度４．７％（ｗｔ）时，透过液乙醇浓度达到７６％（ｗｔ）以上，分离系数αｅ／ｗ）达６５以上；对酒精发酵液，供给液乙醇浓度４．８％（ｗｔ）时，透过液乙醇浓度达到８２％（ｗｔ）以上，分离系数α（ｅ／ｗ）高达９０以上．充分说明了所合成的硅沸石膜对酒精水溶液具有非常高的分离效果．     

无机胺合成ZSM—5沸石分子筛

利用氨水为模板剂合成了ZSM-5沸石分子筛，研究了合成温度和时间对分子筛合成的影响。实验表明，在142～177℃范围内，以氨水为模板剂都可以合成出ZSM-5沸石分子筛。合成温度越低，所需时间越长，同时以XRD为手段，对分别以氨水和正丙胺为模板剂合成的ZSM-5沸石分子筛的结构进行了比较。     

纳米级品种预涂层法Silicalite-1型沸石膜合成及其结构分析

在大孔α—Al2O3陶瓷管栽体上采用晶种预涂层法在澄清溶液体系中水热合成了Silicalite-1型沸石膜，用SEM和XRD表征了晶种、晶种涂层后载体和成膜后沸石膜的结构、晶形变化、晶相结构等成膜情况，并初步考查了两种不同温度（130℃和160℃）下生长成膜的结构变化．结果表明：制备的品种呈椭球形、晶粒小（约100nm）而均匀、纯度高．适合作晶种涂层成膜；所用载体孔径大而不均匀、表面粗糙而不平整，但经品种涂层后表面可形成一层厚度均匀、光滑的晶种层，再水热晶化时有利于成膜．所得膜连续、清晰无裂缺，载体、晶种层和沸石膜层之间相互结合紧密；连续晶种层改善了载体表面的性能。有利于连续Silicalite—1沸石膜的形成；合成温度不同，沸石晶粒在载体表面生长的方向不同，所形成的膜微观结构也不同．该合成方法能适合其他不同类型沸石膜的制备．     

树形分子为模板低温制备纳米硫化锌空心球

利用3．5代端酯基PAMAM树形分子（G3．5-COOCH3）为模板，低温下成功制备了纳米硫化锌空心球，用透射电子显微镜（TEM）、X射线粉末衍射（XRD）及紫外吸收光谱等手段对合成样品的形貌、结构及性能进行了表征．TEM结果显示，ZnS空心球的直径在80～100nm范围左右，其壳层的厚度约为20～30nm．树形分子的农度对产物的最终形貌和结构均有很大的影响．并讨论了空心球结构形成的可能模板机理．     

合成条件对介孔空心微球的形貌及结构的影响研究

介孔空心微球的合成对于获得优良的吸附剂, 催化剂和药物缓释剂具有十分重要的意义. 采用十二胺(DDA)为主模板剂, 聚乙二醇1000(PEG1000)为辅助模板剂, 成功地合成出了具有介孔孔壁的, 比表面积可高达951.23 m2/g 的空心二氧化硅微球. 考察了温度, 浓度, 溶剂等合成条件对合成的介孔空心微球的结构及形貌的影响, 实验结果表明合成温度及溶剂对合成的材料的结构及形貌具有显著的影响. 不同比例的醇水混合体系用做溶剂时, 可得到形貌及有序度完全不同的物质. 最佳的合成温度约为30-40℃, 低于该温度时, 合成的样品难以形成空心球结构, 而高于该温度时, 空心球结构将受到破坏. 此外, 模板剂的浓度也对合成样品的结构具有重要的影响.     

模板分子四甲基乙基二胺在丝光沸石、ZSM－5及ZSM－35孔道中的位置及模板分子与骨架的相互作用

用化学分析、粉末Ｘ射线衍射、傅里叶红外吸收光谱、热失重及差热分析、１３Ｃ魔角固体核磁交叉极化（ＣＰ）及高功率去偶（ＨＰＤＥＣ）谱对由模板分子四甲基乙基二胺（ＴＭＥＤＡ）导向合成的高硅沸石ＺＳＭ－５、ＺＳＭ－３５及丝光沸石进行研究，揭示了该模板分子在沸石孔道中的位置、运动状态及模板分子与骨架的相互作用．     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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