TiO2纳米管阵列不同pH值电解液中的制备及其光电性能

通过调节电解质溶液的pH值,研究了pH值对氧化钛纳米管阵列形貌的影响,研究表明水质电解液pH值控制在3~5时,氧化钛纳米管阵列的形貌更加规则。通过瞬态电流变化、短路电流-开路电压、电化学阻抗谱分析了在pH值=4的电解液中制备的氧化钛纳米管阵列的光电性能及电化学性能。研究表明经热处理的锐态型氧化钛纳米管阵列具有较好的光敏特征和光电转换性能,并表现出明显的高频阻低频电容电化学特性。     

银掺杂TNA的光电性能及阻抗谱研究

为深入研究银掺杂对氧化钛纳米管阵列光电性能的影响,采用光沉积的方法对氧化钛纳米管阵列进行了掺银修饰,通过瞬态电流变化、短路电流开路电压测试、电化学阻抗谱等研究了掺银氧化钛纳米管阵列的光电性能.研究结果表明,银粒子的引入能降低电子跃迁需要的激发能量,增加光生电子转移的途径,有效提高氧化钛纳米管阵列的光电性能.     

阳极氧化TiO2纳米管阵列的制备及场发射性能

采用阳极氧化法以HF水溶液为电解液制备二氧化钛(TiO2)纳米管阵列,用场致发射扫描电子显微镜和X射线光电子能谱对纳米管阵列的表面形貌、断面结构及元素组成进行表征,并使用场发射测试系统测试其场发射性能,研究了HF水溶液的pH值对TiO2纳米管阵列形貌(管径及管长)的影响。结果表明:调节电解液的pH值可改变TiO2纳米管阵列的形貌,从而提高其场发射性能。当电解液pH值为2.0时TiO2纳米管阵列的场发射开启场强降为2.52 V/μm,且具有较好的电流稳定性。     

TiO_2纳米管阵列的制备及其光电化学性质研究

以H3PO4/NH4F水溶液为电解液,在20V下阳极氧化钛片1h制得TiO2纳米管阵列,其管径约为100nm,管长约800nm。经不同温度煅烧后,利用FESEM、XRD和光电化学分析测试系统分别对纳米管阵列的形貌结构、晶相组成以及光电化学性质进行研究。光电化学特性研究结果表明600℃热处理后性能最佳。当前体系中所制备的薄膜结构上高度有序,光电化学性质优良,作为光电极材料在太阳能光电转换、光催化等领域具有广阔的应用前景。     

TiO_2纳米管的制备及光电性能研究

以NH4F-乙二醇为电解液阳极氧化制备Ti基TiO2纳米管,利用扫描电镜(SEM)图像分析TiO2纳米管阵列的退火前后的形貌结构变化,研究退火温度对TiO2纳米管光电性能的影响。分别用CdS、曙红对TiO2纳米管进行敏化,并研究了其敏化后的光电性能和电极稳定性。结果表明:退火并未改变TiO2纳米管结构,经CdS敏化后的TiO2纳米管光电性能最好,且电极稳定性也较好。     

甘油/DMF混合体系中TiO2纳米管阵列的制备及表征

采用电化学阳极氧化法,以甘油/DMF混合溶液为电解质,在纯钛表面制备了一层排列紧密、结构规整的TiO2纳米管阵列。讨论了氧化电压、电解液中DMF比例、电解液中水含量和电解液重复使用对TiO2纳米管阵列形貌的影响,并且从阳极氧化过程中电流-时间曲线出发分析了混合体系中阳极氧化的形成特征。研究表明,氧化电压越高所制备的纳米管管径越大,但是管长与氧化电压之间不呈线性关系;电解液中DMF比例增加不利于纳米管形成;电解液中水含量越高,纳米管管径越大,表面的覆盖物越多,最佳的水含量为1%(体积分数)。经450℃热处理2h后TiO2纳米管阵列的结构由无定形转变为锐钛矿型。     

阳极氧化法制备TiO2纳米管的pH值参数研究

采用电化学阳极氧化法在HF水溶液体系中对钛金属进行表面处理,得到高度规整的TiO2纳米管阵列.主要研究了电解液pH值大小对TiO2纳米管阵列形貌(管径及管长)的影响;用扫描电子显微镜(SEM)对其表面形貌进行表征.结果表明:酸性条件下能形成TiO2纳米管;强碱性环境不利于TiO2纳米管的制备;在可制备TiO2纳米管的pH值范围内,管径和管长随pH值升高而减小.采用微孔模型对pH值的影响机理进行了阐述.     

阳极氧化法制备TiO2纳米管阵列及其光电性能研究

采用阳极氧化法在钛片上制备了TiO2纳米管阵列光电极，利用扫描电子显微镜（SEM）和X射线衍射仪（xRD）对TiO2纳米管的形貌和结构进行了表征，详细考察了氧化工艺参数对纳米管阵列形貌的影响，并通过稳态光电响应技术对TiO2纳米管电极的光电化学性能进行了研究．结果表明，在1wt％HF电解液中，控制氧化电压为20V，反应30min后，在Ti表面获得了垂直导向的TiO2纳米管阵列，孔径约为90nm，管壁厚度约为10nm．经600℃退火处理后，TiO2纳米管阵列为锐钛矿型与金红石型的混晶结构，此时电极的光电性能最佳，与TiO2纳米多孔膜电极相比，光电性能大幅提高．     

自组装高有序氧化钛纳米管束的制备

阳极氧化技术在氟基电解液中，对高有序氧化钛纳米管束的制备、特性及在太阳能方面的应用进行了简要综述。材料的结构证明，该材料在光分解水、光催化、气敏检测、光电转化等方面具有潜在巨大的应用。通过改变电压、电解液浓度、pH值、温度，可获得不同长度、直径、形状、壁厚的氧化钛纳米管束。在电解液中加入有机溶剂、淬火等方式掺杂，可改变氧化钛的禁带宽度，从而有效利用太阳能。     

三电极体系制备TiO2纳米管

利用电化学阳极氧化法在乙二醇和氟化铵溶液三电极体系中阳极氧化纯钛箔,制备出具有双面结构的TiO2阵列纳米管。研究了不同电压和电解液含水量对纳米管形貌的影响,通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)分析了TiO2纳米管阵列的微观形貌及物相。     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.