氧化铁黄的研制

氧化铁黄简称铁黄,是晶形的氧化铁水合物(Fe2O3@xH2O).在不同的生产方法和操作条件下,水合程度不同.因此,它们的晶形结构和物理状态有很大的差别,色泽从柠檬黄到橙黄.广泛应用于建筑、油漆、橡胶等工业.随着颜料工业的发展,制造超细透明颜料的研究很活跃.目前,国内外大多数采用无机物合成的方法生产超细氧化铁黄,其工艺复杂,生产成本高.本工艺采用胶体化学方法制备超细透明颜料,即在氢氧化铁水溶胶中加入十二烷基苯磺酸钠(SDBS)和少量PEA表面活性剂,对溶胶进行表面处理,然后用氯仿进行萃取,加热蒸发掉氯仿,烘干、研磨,即得产品.该方法工艺简单,经检验,产品性能优良,具有良好的分散性和着色力,粒度细且均匀.     

超细透明氧化铁黄新工艺

超细透明氧化铁黄又称作羟基铁，分子式为ＦｅＯＯＨ，是一粒径小于１μｍ，在透明介质中有很好分散性的铁系颜料，其着色力强，有很好的透明效果、很高的耐光和耐候性，因其粒径微小而且有很好的吸收紫外光的能力，在涂料、油墨以及医药工业有很重要的应用价值．目前，国内外生产方法主要为空气氧化法．其缺点是工艺步骤多，复杂和耗能大，近几年研究的用ＦｅＣｌ３经胶体化学法制备ＦｅＯＯＨ，因原料成本高而难于工业化．我们参考有关文献资料［１～３］，研究出了空气氧化与胶体化学相结合制取超细透明氧化铁黄新工艺，产率达８６％，涂…     

聚合物接枝改性超细二氧化硅表面状况及形成机理

在超细二氧化硅表面复合接枝聚合改性工艺的基础上,对改性前后超细二氧化硅的表面状况进行了研究,证明通过该工艺能够实现对超细二氧化硅表面接枝聚合改性,能够有效分散超细二氧化硅聚集体,其原因是苯乙烯与预先接枝在超细二氧化硅表面上硅烷偶联剂的双键发生了自由基聚合反应。该改性工艺增强了无机粉体表面改性的针对性。     

一种具有特殊形貌的超细镍粉制备研究

以NiCl2为主要原料，水合肼液相还原合成了刺球状的超细镍粉。刺球状颗粒是球状颗粒表面上长满了锥状刺。同时研究了NaOH浓度，聚乙烯吡咯烷酮(PVP)浓度，以及反应温度对超细镍粉形貌的影响。应用扫描电子显微镜(SEM)、X射线衍射仪(XRD)对镍粉进行了结构表征。研究结果表明镍粉的晶体结构为面心立方，同时颗粒的尺寸可控，随着工艺条件和还原剂浓度变化，粒径在0．1～0．7μm之间变化，相应的刺长在20～250nm之间变化，刺的直径在20～80nm之间。     

超细粉润滑剂的稳定性

为解决超细金属粉固体润滑剂的稳定性问题，分析了单个粉末颗粒和超细金属粉末在液体中实现稳定分散和悬浮的条件，结果表明，表面未包覆的粉末在液相中很难稳定存在，而表面包覆的超细金属粉末由于粉末表面吸附层产生的空间位阻效应，且在只附层厚度大于４．２ｎｍ时，超细金属粉末才能在润滑油中实现稳定的悬浮。     

超细SiO2颗粒废料的表面改性

以通信光纤生产中产生的超细二氧化硅颗粒废料为原料,经水纯化处理后,用硅烷类偶联剂对其表面进行化学改性.傅立叶红外光谱和热重分析结果表明,改性后的超细二氧化硅颗粒表面的硅羟基吸收峰明显减小,热失重增加,表明其与硅烷类偶联剂发生了化学键合;激光光散射和扫描电字显微镜的测定结果发现,改性后的超细二氧化硅颗粒粒径减小,颗粒分散性大大提高,在电镜照片中无明显的大团聚体,表明超细二氧化硅颗粒表面键合了疏水性有机分子链,疏水性增强,达到了改性目的,为超细二氧化硅废料的回收利用提供了广阔的市场.     

超细晶粒金刚石涂层钻头的制备与实验

以钻头为例，根据其复杂形状衬底的特点，研究了一种新的化学预处理方法，并在传统化学气相沉积(CVD)工艺的基础上发展了一种新的CVD分阶段沉积法．实验以氢气和丙酮为原料，采用电子增强热丝CVD法在复杂形状硬质合金(WC-Co)钻头最外表面复合涂覆一层超细晶粒金刚石薄膜，并对碳化硅颗粒增强铝基复合材料进行了钻削实验．结果表明，所制备的超细晶粒金刚石涂层薄膜表面光滑，晶粒尺寸细小，涂层质量良好．提高和改善了涂层刀具的耐用度和切削性能．     

以甲醛为还原剂制备超细铜粉的研究

研究了采用葡萄糖预还原法，以甲醛为还原剂制备超细铜粉的工艺，并且制得了20～400nm范围的超细铜粉。通过实验，研究了制各工艺条件：温度、pH值、表面活性剂、抗氧化剂对超细铜粉的粒度、均匀性、防蚀性等的影响，获得了较佳工艺条件。     

神木煤的气流超细粉碎研究

采用常温气流超细粉碎法，结合扫描电镜，傅里叶变换红外光谱分析及激光粒度分析探讨了神府煤田神木３￣－１煤的超细粉碎性能及表面结构。神水煤通过常温气流超细粉碎可达到物理上的均一性，并且使超细煤中无机显微组分与有机显微组分以解离状态存在，煤表面官能因含量普遍增加。     

颗粒循环时间对干燥造粉影响的研究

颗粒循环时间对干燥造粉影响的研究张金发范铭（东南大学动力工程系，南京２１００１８）１流化表面干燥造粉的物理模型图１单颗粒表面料膜干燥物理模型流化表面干燥造粉是在大颗粒流化床内一次性完成，即料液由喷嘴雾化后，直接喷涂在高温颗粒的表面，形成一层薄膜，并随...     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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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