Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Graphene, the thinnest material with a stable 2D structure, is a potential alternative for silicon-based electronics. However, zero band gap of graphene causes a poor on-off ratio of current thus making it unsuitable for logic operations. This problem prompted scientists to find other suitable 2D materials. Creating v…
Atomistic modelling is playing an increasingly important role as a tool to predict fundamental physical properties as well as mechanical properties of materials. With the steady improvement of powerful computational tools, increasingly realistic models can be employed in simulations of relatively complex systems. This…
采用不同的固溶温度对挤压态Mg-13Al-6Zn-4Cu（质量分数,%）合金进行热处理,然后在（150℃/10 h）条件下进行时效处理,通过金相显微镜、扫描电镜及能谱分析、维氏硬度与极化曲线测试,研究固溶温度对挤压态合金显微组织、硬度与腐蚀性能的影响。结果表明：固溶处理促进晶界处的β-Mg（17）Al（12）相充分溶入α-Mg基体中。提高固溶温度使基体晶粒再结晶长大,逐渐缩小T-MgAlCuZn相心部的Cu元素富集区,改变β析出相的形态和分布,促进层片状β相在α-Mg晶界析出,从而提高时效态合金的硬度。但固溶温度超过420℃时,合金晶粒粗化并发生过烧。固溶温度升高导致合金腐蚀电位负移,腐蚀电流增大,腐蚀速率加快。
Abstract A broadband absorber comprising tungsten cubic arrays, a alumina layer and a tungsten film, is numerically and experimentally investigated, which exhibits near-unity absorption of visible and near-infrared light from 400 nm to 1150 nm. Benefiting from high melting points of tungsten and alumina, this device h…
采用高能球磨与热压烧结相结合的方法制备了5wt%n-SiC/7075铝基复合材料,研究了5wt%n-SiC对7075铝合金组织与性能的影响。结果表明高能球磨后,5wt%n-SiC/7075铝基复合粉体较7075合金粉体明显细化。当转速350r/min,球料比20：1,球磨时间20h时,n-SiC均匀分布到7075合金颗粒中。由于n-SiC的均匀分布对7075铝合金产生细晶强化与弥散强化的作用,使得热压烧结温度为620℃,加压100MPa,保温保压1h制备的5wt%n-SiC/7075铝基复合材料的致密度、硬度及抗压强度均优于相同工艺制备的7075铝合金,尤其抗压强度较7075铝合金提高约58.4%。
Scanning tunneling spectroscopy (STS) allows for probing the local density of states of surfaces and adsorbates with atomic spatial resolution. When molecules or other nanostructures are electronically decoupled from the surface, STS can be interpreted in terms of the electronic structure of the isolated adsorbate. Ul…
Accurate prediction of the final shape using numerical modeling has been a top priority in the field of sheet and bulk forming. Better shape prediction is the result of a better estimation of the physical stress and strain state. For experimental and numerical investigations of such estimations, simple benchmark proce…
Optical fiber sensing technology has been shown to advantage in physical testing. In terms of chemical content and biomass detection, its specificity and flexibility cannot meet the demand of the rapid development of biology, chemistry, due to the material, structure and process of bondage. At the same time, along wit…
Stainless steel samples (304) were passivized in 1.0 N sulfuric acid at different passivation potentials. Effect of different holding time on the passivation at corresponding passivation potential was also investigated. Corrosion resistance property of the passivated and the bare samples in NACE solution were measured…
In our work the results of analytical and numerical investigation of equilibrium forms of round conductive and ferromagnetic micro-membrane situated in uniform electrostatic or magnetic static field and also the branching of equilibrium forms of the system of two and three nano-layers with direct currents are describe…
This study involved experiments on signal colocalization between αvβ3 integrin and RGD conjugated nanoemulsions as well as studies on nanoemulsion distribution and differences between the internalization patterns of RGD-NE and RAD-NE over time. This study was carried out on HUVEC cells and they were experimented upon…
. , ( ) . -1 ( 0,5-2,0 % ). -1 , , , -. -1 ( ) 50-100 % (28 .
Tässä kirjallisuustutkimuksessa on käsitelty sotateknisten suojarakenteiden materiaalinvalintaa nanohiiliputkiseostetun boorikarbidin (B4C) kannalta sekä sen hyödyntämistä Suomen Puolustusvoimissa. Suojarakenteiden ominaisuudet pisteytettiin soveltuvin osin VDI 2221-luokituksen mukaisesti ja niistä muodostettiin vaati…
采用水溶液聚合法，以2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、N，N-二甲基丙烯酰胺（DMAM）和甲基丙烯酸（MAA）为单体合成了三元共聚物。以共聚物的降失水能力为指标设计正交试验，结果表明，聚合反应的最佳合成条件为：反应温度50℃，引发剂用量1．0％，体系pH值11。通过红外光谱、核磁氢谱和热重分析对其结构和热性能进行了表征，证明了目标产物为AMPs／DMAM／MAA共聚物，该共聚物的分解温度为310℃。对水泥浆的性能研究则表明聚合物具有良好的降失水能力，在淡水中，当聚合物加量超过3％（BWOC）时可在90℃下将水泥浆失水量控制在100mL以内，且水泥石强度发展快，对水泥石力学性能无不良影响。
以5V高电压LiNi0．5Mn1．5O4为正极材料，高安全性Li4Ti5O12为负极材料制备了LiNi0．5Mn1．5O4／Li4Ti5O12全电池，重点研究了正负极容量配比对电池电化学性能的影响。其中正极容量过量40％的电池具有最好的倍率和循环性能，在0．5C电流下．P／N=1．4的电池的最高放电比容量为164．1mAh·g^-1，循环200次的容量僚持率为88％：在2C电流下，P／N=1．4的电池的最高放电比容量为1352mAhg^-1，循环740次的容量保持率为91．1％。P/N=1．4的电池良好的倍率和循环性能与其内阻较小、电池极化较小等因素有关。
Visualizing and quantifying biomineralization in a wellbore analog reactor
We have measured adsorption isotherms at ten different temperatures from 90.432 K to 163.812 K for CF4 on a sample of chemically-opened carbon nanohorns. The interior of the individual nanohorns is accessible to sorbates in these chemically opened nanohorns. Two substeps are visible in the adsorption data, one corresp…
实际应用中的薄膜或多或少存在体折射率不均匀缺陷，其准确表征对于镀膜工艺参数调校、低损耗薄膜设计与制备分析等具有影响。从Schr-der近似出发，推导了体折射率弱不均匀薄膜的膜系特征矩阵，通过特征矩阵法推广，建立了体折射率弱不均匀多层膜光谱特性计算的近似模型。利用基于有效介质理论的多层均匀膜近似方法，讨论了上述近似模型的有效性、计算精度和时间消耗特性。结果表明，上述模型矩阵计算中引入体折射不均匀度这一参数，为多层膜体折射率不均匀缺陷反演提供了一种有效的手段，为基于宽带光谱测量数据拟合的膜层缺陷数值反演应用奠定了基础。
In recent decades, growing CO2 in the Earth's atmosphere has become a major issue. Thus, it is crucial to reduce the level of concentration of CO2 in the atmosphere. We have investigated the adsorption and reduction of CO2 on metal-doped graphene sheets, through computational methods. The electrochemical reduction of…
利用脉冲激光沉积法在0.7%Nb∶SrTiO3衬底上制备了Co∶ZnO薄膜,并构建了Pt/Co∶ZnO/Nb∶SrTiO3异质结器件。该器件表现出典型的双极性阻变效应,在正、负向电压作用下,器件电阻可以在低阻态和高阻态之间变换,电阻变换比值可达到104,阻态具有一定的保持性与耐久性,同时Co∶ZnO薄膜的饱和磁化强度会产生与阻变相关联的可逆调控。结合ZnO薄膜阻变与磁性调控结果发现,氧空位在Co∶ZnO/Nb∶SrTiO3异质结的阻变及磁性调控中具有重要作用,并采用氧空位产生与湮灭结合载流子注入-束缚/解束缚模型解释阻变与磁性调控。