铝合金表面三嗪二硫醇和硅烷纳米复合薄膜的制备及表征

通过电化学方法,在铝合金表面制备6-N,N-二丁基胺-1,3,5-三嗪-2,4-二硫醉单盐(DBN)的纳米聚合薄膜(PDB),然后采用自组装技术对铝合金表面PDB膜进行十六烷基三甲氧基硅烷化处理,形成疏水性的高分子纳米复合薄膜(CPDB).通过循环伏安法解释了DBN在铝合金表面的反应及PDB的生长过程,同时分析了CPD...     

铜表面有机镀膜及薄膜性能研究

通过有机镀膜的方法,利用一种自设计合成的三嗪硫醇化合物(TTN)在铜表面制备有机薄膜.通过循环伏安法解释了TTN在纯铜表面的反应及有机薄膜(PTT)的生长过程,并在0.05mA/cm2的电流密度下进行恒电流有机镀膜.通过电化学方法对薄膜的性能进行了评价,测试结果显示有机镀膜方法能在铜表面获得均匀致密的有机膜,为有机介电薄膜的制备提供研究基础.     

疏水型纳米SiO2-MTES复合薄膜的制备及性能

采用溶胶-凝胶技术,通过酸/酸二步法控制实验条件,由于表面活性剂具有特殊的表面活性性能,实验中采用表面活性剂十六烷基三甲基溴化氨(CTAB)为模板剂,正硅酸乙酯为硅源,甲基三乙氧基硅烷为有机硅烷,以及二次去离子水,盐酸为催化剂等原料制备SiO2-MTES(摩尔比11.15)前驱体溶胶.通过简单提拉迅速蒸发溶剂等方法制备二氧化硅-甲基三乙氧基硅烷的有机-无机复合薄膜,测得的红外透射光谱表明所制备的薄膜由于掺入甲基基团而疏水,接触角测试值约125度,其结果进一步支持这一结论.未加MTES的薄膜折射率为1.18,膜厚305nm.加入MTES后薄膜折射率为1.22,膜厚为289.6nm.透射光谱和机械性能测试结果表明所制备的疏水型纳米SiO2-MTES复合薄膜同时还具有良好的光学性能和机械性能.     

金属表面均三嗪二硫醇类化合物纳米薄膜制备及应用

金属材料表面功能性纳米薄膜的制备研究已成为当前新材料科学研究领域的热点,其中均三嗪二硫醇类化合物的功能膜是其中之一。介绍了均三嗪二硫醇类分子的结构和特性;综述了均三嗪二硫醇类化合物纳米薄膜和聚合膜的制备方法及其应用领域,对该类化合物在不同金属表面的吸附和聚合机理进行归纳并讨论分析;展望了该类化合物聚合纳米膜新的应用前景。     

基于多孔氧化铝腐蚀的表面结构制备及其疏水性能研究

先采用阳极氧化法在铝基板上制备了多孔氧化铝(AAO)膜,并以铝基AAO膜作为前驱物,采用化学腐蚀溶液分别制备出了具有纳米结构、微米结构和微纳复合结构表面的薄膜材料结构。利用扫描电子显微镜、荧光分光光度计和电子能量色散谱仪等测试手段分析了薄膜材料表面结构,并在薄膜表面涂覆低表面能物质氟硅烷薄膜研究这些表面结构的疏水性能。研究结果表明:通过控制化学腐蚀时间可以在铝基AAO膜表面分别获取纳米结构、微纳复合结构和微米结构;与未腐蚀的AAO膜表面相比,三种表面结构都有效提高了疏水薄膜表面的疏水性能;在NaOH溶液腐蚀16 min条件下,表面呈现微纳复合结构,具有超疏水性能,水的接触角达到155°。     

微-纳米复合金刚石薄膜的制备与性能研究

在钛-铝-钼为过渡层的Cu片上,用微波等离子体化学气相沉积(MPCVD)方法首先沉积一层微米金刚石薄膜,然后沉积纳米金刚石薄膜,制备了微-纳米复合金刚石薄膜.利用扫描电镜(SEM)观察薄膜的表面形貌及界面状态,利用拉曼光谱及X射线衍射对薄膜微结构进行分析并采用压痕法检测了膜基间的结合力并观察了压痕的状态.结果表明,该薄膜下层颗粒粗大,是微米级的金刚石,上层颗粒细小,是纳米级的金刚石,薄膜表面平整光滑;薄膜的附着力与纳米金刚石沉积时间的长短有关,当沉积时间为2 h时,薄膜与衬底的结合力最好.     

铜合金表面均三嗪二硫醇与硅烷复合自组装薄膜的制备及其耐蚀性

采用自组装技术,在铜合金表面制备了单一6-N,N-二丁基胺-1,3,5-三嗪-2,4-硫醇(DB)和3-巯基丙基三甲氧基硅烷(MPTES)自组装薄膜及二者的复合自组装薄膜。通过傅里叶变换红外光谱(FT-IR)、接触角测量、极化曲线和盐水浸泡实验(0.5M NaCl)对铜合金表面的自组装薄膜的特性进行了表征。结果表明:与未处理的铜合金相比,经复合自组装薄膜修饰的铜合金表面接触角由85.8°上升到107.3°,提高了铜合金表面的疏水性;红外光谱结果也表明复合自组装薄膜在铜合金表面的形成;极化曲线测试和盐水试验均表明了该复合自组装薄膜有效地提高了铜合金的耐腐蚀能力。     

导电聚合物有序超薄膜成膜性能的研究

采用LB膜诱导沉积法制备PEDOT高度有序导电聚合物薄膜,采用的工艺是将十八胺(ODA)与聚3,4-乙烯二氧噻吩/聚苯乙烯磺酸(PEDOT-PSS)先形成ODA包裹PEDOT-PSS纳米粒子的组装体,然后再将其铺展于气/液界面,制备PEDOT-PSS复合LB膜。实验表明,PEDOT-PSS纳米粒子对单分子层具有包裹作用,形成了稳定的复合单分子膜;不同膜压下制备的膜表面形貌不同,较高膜压下得到颗粒紧密排列的薄膜,亚相温度23℃、PEDOT-PSS浓度1×10-3mol/L、压缩速率5mm/min、拉膜速率为1mm/min的条件下薄膜具有较好的成膜性能。     

我国聚合纳米薄膜制备技术打破日本垄断

正据中国科学院青海盐湖研究所3月1日消息,该所在均三嗪二硫醇硅烷聚合纳米薄膜制备及应用领域打破日本垄断,中国成为全球第二个掌握该项技术的国家。纳米薄膜是指由尺寸为纳米数量级(1~100nm)的组元镶嵌于基体所形成的薄膜材料,它兼具传统复合材料和现代纳米材料的优越性。目前纳米薄膜材料在国防、通信、航空     

在钽电解电容器多孔阳极体表面化学原位被覆聚乙烯二氧噻吩(PEDT)薄膜研究

研究在传统固体钽电解电容器多孔阳极体微孔内表面原位化学聚合制备PEDT导电聚合物薄膜的方法,通过对比所制有机固体钽电解电容器等效串联电阻(ESR)值的变化,讨论了采用化学原位聚合被膜过程中,受限空间里高分子链形成机理以及在受限条件和开放平面条件下被覆的聚合物薄膜导电性能的变化,采用SEM、AFM、X射线能谱对所制样品表面形貌变化以及多孔阳极体内部聚合物薄膜的被覆情况进行了研究。结果表明,在受限的空间里化学聚合反应生成的聚合物薄膜电导率会由于受限能的影响而降低,其影响程度相似于聚合溶液浓度的变化对聚合物薄膜电导率的影响。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

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.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

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.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

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.