共查询到19条相似文献,搜索用时 531 毫秒
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主要探讨了二组分体系的相图,如气-液相图和液-固相图,总结了二组分相图的分类、绘制及相图分析,这有利于理解和掌握二组分相图的基本规律。并简单介绍了相图边界理论,扩展了相图的热力学研究。 相似文献
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以相图拓扑学规律为基础,提出了利用系列恒温截面分析相平衡空间结构以及绘制立体相图时的判误数点分析法,以实例说明数点法在相图分析中的应用,并提出了三维相图的构造的实用判误方法。 相似文献
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相图由相区及其边界组成。如果能阐明相区及其边界如何构成相图的规律,对理解、应用、计算和测定多元相图无疑是至关重要的。因此,前人对它已经进行了大量的研究,有了许多经验法则和理论,但是这些法则和理论仍有不足之处。我们通过对于相图的深入分析,发现 相似文献
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吉林大学化学系赵慕愚教授和宋利珠教授合著的《相图的边界理论及其应用》一书,是一本介绍和讨论赵慕愚教授所提出的相图边界理论的专著。为了更加深刻地理解相图和应用相图,作者积多年教学获得的经验和科研成果,对原有的相图构成理论做了重要的补充和完善,提出了一些新的概念,找到了在相图中,相区及其边界构成相图的基本规律。相平衡理论和相图是物理化学学科中的一个重要分支。在化工、冶金和材料等学科及相关的技术领域有着极为重要的应用。但是对于相图构成原理的研究并不完善。赵慕愚在研究恒压相图的边界理论时发现,相区的概念清楚(相… 相似文献
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主要从3个方面介绍了二组分平衡体系的T-x相图。一是简单相图的介绍;二是简单相图的组合;三是实际体系复杂相图的认识。从而可以让学生理解和掌握相平衡中的二组分体系的气-液、液-液和液-固平衡的T-x相图,并为实际应用打下良好的基础。 相似文献
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Dr. Luigi Gentile Prof. Luigi Coppola Dr. Sandor Balog Prof. Kell Mortensen Prof. Giuseppe A. Ranieri Prof. Ulf Olsson 《Chemphyschem》2015,16(11):2459-2465
Metastability and phase coexistence are important concepts in colloidal science. Typically, the phase diagram of colloidal systems is considered at the equilibrium without the presence of an external field. However, several studies have reported phase transition under mechanical deformation. The reason behind phase coexistence under shear flow is not fully understood. Here, multilamellar vesicle (MLV)‐to‐sponge (L3) and MLV‐to‐Lα transitions upon increasing temperature are detected using flow small‐angle neutron scattering techniques. Coexistence of Lα and MLV phases at 40 °C under shear flow is detected by using flow NMR spectroscopy. The unusual rheological behavior observed by studying the lamellar phase of a non‐ionic surfactant is explained using 2H NMR and diffusion flow NMR spectroscopy with the coexistence of planar lamellar–multilamellar vesicles. Moreover, a dynamic phase diagram over a wide range of temperatures is proposed. 相似文献
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合成了具有层状结构的热致相变材料四氯合锌酸十六铵(n-C16H33NH3)2ZnCl4,C16Zn)和四氯合锌酸十八铵(n-C18H37NH3)2ZnCl4,C18Zn)(在340~370 K的温度范围内存在着焓值较大的可逆固-固相变)。 并将此2种材料在乙醇溶液中结晶出一系列二元体系。 对二元体系利用差热分析(DTA)和X射线衍射技术进行测定,构筑了C16ZnC18Zn二元体系亚固相相图。 根据相图,确定了w(C16Zn)=41.11%处有中间化合物(n-C16H33NH3)(n-C18H37NH3)ZnCl4的存在,并测定在w(C16Zn)=16.19%和w(C16Zn)=63.07% 2处存在着2个不变的共析点,2个共析点温度分别约为356和353 K。 与同类体系的其它相图相比,在此相图的左右边界存在端际固溶体(α和β)和中间区域存在非化学计量相(γ)。 相似文献
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The present paper reports on the phase diagram of the system PEO/Urea as established by differential scanning calorimetry. From this phase diagram one PEO/Urea compound is indentified with a stoichiometry 1/2. This value is in agreement with results derived from X-ray diffraction. 相似文献
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Based on the method of compound synthesis, a new method of constructing the isothermal section phase diagram of ternary system is presented and the ternary C6H14O6-KCl-H2O system is taken as an example. By determinating the optical rotation of the saturated solution in the equilibrium system, the contents of the other components can be calculated, and then the isothermal section diagram of the ternary system can be constructed. The results shows that the common saturation point is as=58.5%, bs=17.4%, cs=24.1%. The general application of the method is discussed also in this paper. 相似文献
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The phase diagram of an emulsion system was used to make a comparison between the calculated evaporation path of an emulsion during equilibrium under moderate relative humidity and during distillation under reduced pressure also under equilibrium conditions. The results showed a most significant difference, because the distillation under reduced pressure takes place into an atmosphere with highly reduced relative humidity and the level of relative humidity has a decisive effect on the evaporation path. A conclusion was reached that estimations about the evaporation path from distillation results should be complemented by information from the phase diagram. 相似文献
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研究了铬酸钠碳氨转化过程中Na+, NH4+// CrO42-, HCO3--H2O体系的溶解度和相图.根据溶解度和相图对铬酸钠的氨水溶液碳氨转化过程固相析出行为进行分析.结果表明: 相图中存在NaNH4CrO4·2H2O复盐结晶区,浓度较高的铬酸钠氨水溶液转化过程中NaC(HO)3、(NH4)2CrO4和NaNH4CrO4·2H2O结晶可能同时析出,形成混晶.为避免同时析出铬酸铵、碳酸氢钠结晶,铬酸钠氨水初始溶液浓度应稍低于相图中P2(P2′)对应的组成,即为1 g H2O中Na2CrO4 0.8633~1.1377 g,氨0.0611~0.0986 g. 相似文献
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Shi Ling YUAN * Gui Ying XU Zheng Ting CAI Institute of Theoretical Chemistry Shandong University Jinan Institute of Colloid & Interface Chemistry Shandong University Jinan 《中国化学快报》2002,13(10)
There is a growing interest in the study of surfactant self-assemble in oil/water/surfactant system because of their applications not only in traditional colloid chemistry but in analytical, synthetic, and medicinal chemistry as well1,2. In these systems, one of the most commonly studied surfactants which can form reverse micelles is sodium bis(2-ethylhexyl) sulfosuccinate, i.e. Aerosol OT (AOT)3. The properties of the AOT reverse micelles have been discussed by some experimental methods4… 相似文献
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新戊二醇-三羟甲基甲胺二元体系相图 总被引:5,自引:0,他引:5
多元醇是一类具有技术和经济潜力的相变贮热材料[1 -3].对多元醇及其二元体系贮热性能的研究已日趋完善,而对于其相图的研究则较少.本文采用以下三种实验技术测绘了NPG TAM二元体系相图:(1)热分析,以得到组成与相转变温度的关系;(2)变温红外光谱的研究,通过特征吸收峰随温度的变化,可以得到相转变温度区间,辅助相图的绘制;(3)X射线衍射,通过淬冷的方法来获得高温下的物相,测其X衍射图,进行相区分析.1实验1.1试剂NPG:为超纯试剂,日本东京化成株式工业会社生产:TAM:分析纯,北京化学试剂厂… 相似文献