薄层色谱法分离鉴定复方葛根合剂中桂皮醛,芍药甙和甘草次酸

建立了复方葛根合剂桂皮醛、芍药甙和甘草次酸的薄层色谱鉴别方法,考察了展开系统、样品的分离纯化方法、展开温度等因素对薄层色谱鉴别的影响情况,研究了制剂的薄层色谱行为,为复方葛根合剂的质量控制提供了有效的检测手段。     

高效薄层色谱

高效薄层色谱,是一种高灵敏度快速微量定量分析方法。本文就高效薄层色谱技术的薄层板、试样点样方法、展开技术、分光光度计定量方法的进展情况作了概括介绍。     

薄层色谱法的新进展

自五十年代末,薄层色谱(TLC)法开始应用于化工、医药及生物等各个领域后,陆续发展了一些特殊技术,如梯度薄层色谱、用各种不同的方法来选择展开剂、多种的展开方式、薄层定量扫描及薄层色谱与其它色谱、光谱等联用技术的发展,使薄层色谱法的应用更加广泛。     

一种散剂中甘草薄层色谱鉴别方法的建立

目的:一种散剂中甘草薄层色谱方法的建立。方法:采用薄层色谱法,对散剂中甘草进行鉴别研究,以甘草酸单铵盐作为对照,并对不同前处理方法、不同的点样量、不同展开系统、不同薄层板、不同湿度、不同展距等进行了考察。结果:甘草薄层色谱分离较好,斑点清晰,阴性试验无干扰。结论:研究所建立的方法操作简便,专属性强,耐用性好,可以用于此散剂中甘草的鉴别。     

芪天扶正胶囊的薄层鉴别

为芪天扶正胶囊质量标准转正提供科学依据,实验对处方中的药材胡芦巴、山茱萸、陈皮等进行了样品处理、展开系统和显色方法等薄层色谱条件的研究,所确定的薄层色谱方法,专属性强,重现性好,可用于芪天扶正胶囊的定性质量控制.     

复方布洛芬片的簿层色谱法研究

研究了复方布洛芬片的薄层色谱行为，考察了展开温度、薄层板厚度对主药伪麻黄碱和布洛芬比移值的影响情况，建立了复方布洛芬片的薄层鉴定方法，并为双波长薄层扫描法测定复方布洛芬片中主药含量奠定了基础。     

鲜余甘子药材的薄层色谱鉴别方法研究

目的:研究广东习用药材鲜余甘子的薄层色谱鉴别方法。方法:以广东产鲜余甘子对照药材为参比,对药材鲜余甘子进行薄层鉴别,并考察了提取方法、展开系统、点样量、显色剂等因素对鲜余甘子药材薄层色谱的影响。结果:最佳色谱条件为硅胶G薄层板,氯仿:乙酸乙酯:甲醇:甲酸(9:9:3:0.2)为展开剂,以10%硫酸乙醇试液显色,置紫外灯(365 nm)下检视。结果显示此条件下斑点分离效果最佳,鲜余甘子药材薄层鉴别特征斑点清晰,耐用性好。结论:该薄层方法可行,重复性好,可作为鲜余甘子药材的薄层色谱鉴别方法。     

薄层色谱在染料合成中的应用实例

本文介绍了薄层色谱(TLC)在染料合成中的应用和改进方法。在利用TLC法检测某水溶性染料的合成过程中,用细玻璃棒代替毛细管点样,降低薄层展开高度,收到了良好的效果。此改进方法也可以应用到其他精细化工产品合成过程的检测。     

消痹膏薄层色谱鉴别方法研究

建立消痹膏薄层色谱鉴别方法,为制定质量标准提供依据。采用薄层色谱法对消痹膏中白芷、姜黄等所有饮片进行定性鉴别。分别以石油醚(30~60℃)-乙醚(3∶2),甲苯-甲醇-冰醋酸(30∶3∶1)为白芷、姜黄的展开剂,在硅胶G薄层板上展开,所得薄层色谱斑点清晰,阴性对照无干扰。该方法专属性强,重复性好,可用于消痹膏的定性鉴别。     

光密度计用于薄层色谱的定量分析

一、薄层色谱应用简述薄层色谱作为混合物的分离手段,由于它有很多优点:操作简单、展开速度快、分离效率高和检出灵敏度高,因此被广泛使用。但是由于它在定量上存在一些困难,在过去一段时期内,没有气相色谱发展得快。国内在火炸药领域中,已将薄层色谱应用于梯恩梯、二硝基重氮酚等环境保护的废水处理过程中,以及火炸药合成中的杂质和贮存过程中分解产物的鉴定。     

井-震-演联合地层对比技术在薄层复杂碎屑岩油藏描述中的应用

小层划分与对比是油田开发方案实施的基础,对于薄层复杂碎屑岩油藏而言,常用的方法不能解决油藏的小层对比问题。为了解决类似油藏所普遍存在的难题,在塔河油田三区石炭系卡拉沙依组砂泥岩段油藏描述中,采用了井震演联合地层对比划分技术,在小层划分中主要参考了高分辨率反演成果,从砂层组到小层划分循环迭代,逐级划分,细化了卡拉沙依组油藏开发的小层对比和划分。并且,从主力含油砂体描述成果对油水关系分析来看,小层划分对比结果是合理的,小层对比划分方法是可行的。     

The Dependence of the Effective Dielectric Constant of PbTiO 3 on the Surface Layer

Complex oxide thin films, such as ferroelectric thin films, are being widely used in various devices. However, the chemical composition and chemical bondings of the surface layer are usually different from those in the "bulk" region of the oxide thin films. The existence of the surface layer will certainly affect the properties, such as dielectric behavior, of the films. Departing from the effective medium theory, the dependence of the effective dielectric behavior of PbTiO 3 thin films on the surface layer has been analyzed by using the model we proposed. The effective dielectric constant of the thin film is proposed as the function of the dielectric constants of the expected compounds and the unexpected compounds in the surface layer, the content of the unexpected compounds compared with the expected compound in the surface layer, and the volume faction of the surface layer in the whole thin films. The surface layer deviating stoichiometry has a pronounced effect on the effective dielectric constant of the thin films.     

银翘颗粒薄层鉴别的研究

建立银翘颗粒的薄层鉴别方法;方法:采用薄层色谱法鉴别银翘颗粒中的金银花、连翘;结果:薄层色谱斑点清晰,空白对照无干扰;结论:所建立的方法简便,结果准确,可用于银翘颗粒制剂的薄层鉴别。     

薄层层析法分析有机化合物的局限性

采用薄层层析法对不同沸点的有机化合物进行了测定。结果表明,对于低沸点的化合物,由于样品在点样和展开过程中挥发损失的原因而不能进行显色处理,从而无法进行测定。只有当有机化合物的沸点较高时才有可能用薄层层析法进行测定。     

Corrosion of pure magnesium under thin electrolyte layers

The corrosion behavior of pure magnesium was investigated by means of cathodic polarization curve, electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN) under aerated and deaerated thin electrolyte layers (TEL) with various thicknesses. Based on shot noise theory and stochastic theory, the EN results were quantitatively analyzed by using the Weibull and Gumbel distribution function, respectively. The results show that the cathodic process of pure magnesium under thin electrolyte layer was dominated by hydrogen reduction. With the decreasing of thin electrolyte layer thickness, cathodic process was retarded slightly while the anodic process was inhibited significantly, which indicated that both the cathodic and anodic process were inhibited in the presence of oxygen. The absence of oxygen decreased the corrosion resistance of pure magnesium in case of thin electrolyte layer. The corrosion was more localized under thin electrolyte layer than that in bulk solution. The results also demonstrate that there exist two kinds of effects for thin electrolyte layer on the corrosion behavior of pure magnesium: (1) the rate of pit initiation was evidently retarded compared to that in bulk solution; (2) the probability of pit growth oppositely increased. The corrosion model of pure magnesium under thin electrolyte layer was suggested in the paper.     

无机分散剂磷酸钙在油滴表面的覆盖情况

讨论了悬浮聚合用无机分散剂磷酸钙在苯乙烯油滴表面覆盖情况。单一磷酸钙分散剂在油滴表面形成一薄层;复合分散剂“活性磷酸钙(HAP)+羟基乙基纤维素(HEC)”在油滴表面的覆盖情况随着HEC用量不同,可形成均一薄层.或形成“薄层+絮团”结构,薄层保护液滴不破裂,絮团内部存在许多空隙,利于吸收碰撞能,使液滴碰撞而合并的几率减小。     

Fabrication and properties of ZnO/GaN heterostructure nanocolumnar thin film on Si (111) substrate

Zinc oxide thin films have been obtained on bare and GaN buffer layer decorated Si (111) substrates by pulsed laser deposition (PLD), respectively. GaN buffer layer was achieved by a two-step method. The structure, surface morphology, composition, and optical properties of these thin films were investigated by X-ray diffraction, field emission scanning electron microscopy, infrared absorption spectra, and photoluminiscence (PL) spectra, respectively. Scanning electron microscopy images indicate that the flower-like grains were presented on the surface of ZnO thin films grown on GaN/Si (111) substrate, while the ZnO thin films grown on Si (111) substrate show the morphology of inclination column. PL spectrum reveals that the ultraviolet emission efficiency of ZnO thin film on GaN buffer layer is high, and the defect emission of ZnO thin film derived from Zn_i and V_o is low. The results demonstrate that the existence of GaN buffer layer can greatly improve the ZnO thin film on the Si (111) substrate by PLD techniques.     

七里村油田薄油层测井识别技术研究

针对常规测井曲线纵向分辨率不高,对薄油层的响应值不准确,导致薄油层漏失解释,同时非常规的高分辨率测井系列成本高等问题,本文基于薄层对常规测井响应特征影响分析,确定薄层敏感测井曲线,综合沃尔什反演法、分辨率匹配法、傅立叶频谱法多种提高常规测井曲线纵向分辨率方法,优选出最佳方法,结果表明：傅立叶频谱法处理后的测井曲线能够有效地反映地层的真实信息,通过测井曲线纵向分辨率提高处理以后,砂体划分精度明显比原结论更加精细,测井解释结论更加准确,对全区的开发和储量接替都起到了良好的作用。     

Effect of seeding layer on orientation control of potassium niobate thin film by CSD

This paper focuses on the orientation control of the KN thin film on Si wafer by chemical solution deposition (CSD). We selected the PbO layer and PZT layers as the seeding layer in order to control the crystal orientation of the resulting KN thin film. Crystalline phase in KN thin film was identified by XRD, and the degree of c-axis orientation was calculated from XRD analysis. The resultant KN thin film was orthorhombic perovskite single phase. As a result, highly c-axis oriented thin film (about 90%) was deposited by using PbO seeding layer. The dielectric constant of the resultant KN thin film was measured by impedance analyzer. The dielectric constant of highly c-axis oriented KN thin film was compared with that of the c-axis of KN single crystal.     

非晶硅薄膜太阳能电池研究进展

介绍了非晶硅薄膜太阳能电池的发展现状及制约非晶硅薄膜太阳能发展的两个关键性因素：转化效率低、光致衰减。对近年来提高非晶硅薄膜太阳能转化效率的新技术和非晶硅薄膜太阳能电池光致衰减的特性及模型进行综叙;重点阐述窗口层材料、中间层、叠层电池等提高非晶硅薄膜太阳能电池转化效率的新技术。文章最后对非晶硅膜太阳能电池未来的发展趋势进行了展望。