Materials Literature
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Optical properties of quantum dots have created a lot of interest within the community due to their size tunable, fundamentally unique properties arising from the quantum confinement effect that are unforeseen in bulk. In this review we have highlighted some of the recent advances in the field including the synthetic…
BiFeO3 and BiFeO3-BiMnO3 films were prepared by spray pyrolysis technique and their structural and optical properties were examined. The X-ray diffraction of these films shows that the rhombohedral structure of BFO film is modified and reduced toward the monoclinic or tetrahedral structure at 10 at.% of BiMnO3 with hi…
Crystal defects induced by irradiation obstruct dislocation movement. Hence, the critical resolved shear stress of irradiated material increases. While part of the radiation defects are swept by dislocations released from dislocation sources; therefore localization of plastic deformation are caused by a decrease of ra…
Unidirectional <100> L-Histidine acetate (LHA) single crystal was grown for the first time and reported. The grown crystal was characterized by powder X-ray diffraction (XRD) studies to confirm the crystal structure. The mechanical properties of the grown crystals have been studied using Vickers microhardness tester.…
A novel Brnsted acidic ionic liquid catalyst [HSO3-bmim] + [HSO4] -loaded by ZrO2 was prepared under impregnation method and characterized by means of X-ray diffraction, FT-IR spectroscopy, thermogravimetric analysis-derivative thermogravimetry, scanning electron microscope and element analysis. The results showed tha…
Single phase anatase TiO2 nanoparticles were prepared using Titanium tertachloride (TiCl4) as precursor through an inexpensive method. Well dispersed nanocomposites of silver at TiO2 were synthesized successfully by photochemical route. Both TiO2 and Ag/TiO2 were characterized using X-Ray Diffraction (XRD) and transmi…
近年，柔軟仕上げ剤市場は拡大傾向にある。従来，柔らかさ等の風合いが重視されてきたが，次々と 「香り」 を訴求した柔軟仕上げ剤が市場へ導入されている。香りも，単に良い香りがするだけでなく，その香りが強く，長く持続することも求められるようになってきた。また，柔軟仕上げ剤の香りは，機能性向上，心理的作用へも寄与する。本稿では，柔軟仕上げ剤の 「香り」 にフォーカスし，良い香りを持続するための技術開発，および香りの効果・効能に関する研究について解説する。
In personal care products, polymers may be used as emulsifiers, stabilizers, rheology modifiers (e.g. thickening agent), or film formers. When deposited on the skin, polymer usually doesn’t penetrate the skin due to its high molecular weight and size. It remains on the skin surface to form a film, which may potentiall…
Vertical donor-donor/acceptor-acceptor structured hybrid solar cells employing a low band-gap polymer/PbSxSe1-x alloy nanocrystals (NCs) have been demonstrated with a record high power conversion efficiency (PCE) of 5.50% and a large fill factor of 67%.
摘要： 基于固定界面模态综合法，将柔性结构划分为多个子结构，采用添加-删除技术处理接触约束，建立柔性结构弹粘塑性碰撞动态子结构模型。考虑冲击载荷作用下出现的材料的应变率效应，采用Cowper-Symonds本构关系，推导柔性结构在模态坐标下的碰撞动力学方程，提出柔性结构碰撞弹粘塑性波传播的动态子结构方法，并通过理论证明主模态的存在性和主模态截断的收敛性。运用该方法分析直杆纵向碰撞和简支梁横向碰撞问题，计算结果表明，弹粘塑性波的传播速度，超应力效应，以及超应力幅值逐步衰减等波传播特征，均符合弹粘塑性波的理论特征。同时，通过将碰撞力和弹粘塑性波的数值计算结果与三维动力有限元解进行对比，验证了该方法的数值收敛性和计算碰撞弹粘塑性波传播的…
We investigate the effects of Sn substitution on structural and electrical transport mechanism of polycrystalline samples La0.67Sr0.33Mn1-xSnxO3 (x = 0, 0.05, 0.10, 0.15). Resistivity data have been fitted with the variable range hopping model to estimate the density of state at Fermi level. It was observed that the s…
Redox properties of 2,3-diaminophenazine were investigated in acidic aqueous and acetonitrile solutions. In each case, continuous potential cycling generated deposited products, poly(2,3-diaminophenazine) (PDAP) on electrode surfaces. PDAP deposited from aqueous solution showed rather complicated redox response with r…
The dependence of radiophotoluminescence (RPL) and photoluminescence (PL) properties on x-ray irradiation dose and heat-treatment after irradiation was investigated for Ag+-activated phosphate glass, which is practically used as glass dosimeter for individual monitoring of ionizing radiation. The RPL intensity was inc…
The rolling contact fatigue tests were carried out using case-carburized rollers made of 1.5Cr – 0.2Mo alloyed sintered steel and SCM415 wrought steel. Two kinds of P/M rollers having the initial density of 7.25 × 103 kg/m3 and 7.60 × 103 kg/m3 were prepared. The effects of the case-hardening depth on the rolling cont…
Graphene/CeO2 nanocomposites were synthesized in an erlenmeyer flask from hexadecyl trimethylammonium bromide, ammonium cerium nitrate and graphene. Water and ethanol were added to the mixture and stirred until complete dissolution. After exposing the solution to ultrasonic irradiation for 1 h, the colloid was filtere…
A new technique for the evaluation of local interface adhesion energy was applied to the interface between Cu and cap layer in a Cu damascene interconnect structure, which consists of both the interfacial fracture test and the finite-element simulation. After specimens in-plane dimensions of 1×1 μm, 5×5 μm and 10×10 μ…
ZnAl2O4 was obtained by corrosion synthesis which produced mixtures of zinc alkoxide by metallic zinc dissolution in ethanol and aluminum ions by addition of aluminum chloride as a catalyst. The corrosion product became ZnAl2O4 when the mixtures were hydrolyzed, pH-adjusted, and fired at temperature higher than 873 K.…
古夫河系长江三峡水库湖北省境内香溪河的一条支流，发源于神农架林区并最终汇入三峡水库香溪河库湾，是流域生态学研究的热点水体。对古夫河2010年9月至2011年8月干流及主要支流21个样点的着生藻类叶绿素a和14项环境因子进行了调查，采用多元统计方法对调查数据进行了方差分析、聚类分析、偏相关分析和逐步回归分析，研究了着生藻类叶绿素a的时空分布特征及其主要环境影响因子。结果表明：叶绿素a含量范围为0.07-145.96 mg/m2，平均值为11.63 mg/m2。不同样点的叶绿素a含量差异显著，其中古夫河干流上游低于下游，支流竹园河上游高于下游，表现为人为影响大的区域高于人为影响小的区域；不同季节着生藻类叶绿素a含量差异显著，表现出冬春…
The control of crystallization of praseodymium barium copper iron oxide, an intermediate temperature solid oxide fuel cell cathode material, has been demonstrated for the first time using a biotemplated sol-gel synthesis technique. The results obtained showed significant improvement in purity, synthesis time, surface…
This paper presents the research undertaken at the University of Minho aiming to study the behaviour of 3D weft-knitted structures using Shape Memory Alloy (SMA) wires and elastomeric yarns, in order to produce dynamic structures as a support to answer specific situations and applications. Several samples were produce…