Materials Literature
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Using first-principles calculations based on density functional theory and projector augmented wave method, we investigate the geometric structures, magnetic properties and electronic structures of h-BN monolayer with nitrogen vacancy (VN), nitrogen substituted by oxygen (ON) or sulfur (SN). The results show that the…
Streamer inception and propagation criteria are used for evaluations of ac breakdown voltages of sphere-sphere gaps employing a dielectric barrier in dry air. For such an arrangement, an optimal location of the barrier is expected to exist providing maximum value of the breakdown voltage. To reproduce the barrier effe…
In order to understand how exact Goss-oriented grains form in electrical steel, we studied Goss orientation and microstructure during primary recrystallization using electron back-scattered diffraction. In particular, we examined the effect of heating rate (20°C/s and 150°C/s) on the primary recrystallization behavior…
Channel segregation behavior of a lateral directional Sn-20mass%Bi ingots was examined by X-ray computing tomography (X-ray CT) and three-dimensional numerical analysis. The channel segregation with string shape from near the cold wall side was observed by the X-ray CT and those segregation patterns could be reproduce…
In the present study the corrosion behavior of AISI 316L stainless steel samples, taken from different parts of the ship pipeline, were investigated in chloride solutions. Research was conducted using gravimetric tests in 6 wt.% ferric chloride solution as well as cyclic potentiodynamic polarization measurements in 0.…
Nanocrystalline cobalt titanate (CoTiO3) has been synthesized from a well-mixed precursor. The precursor was prepared by a homogeneous precipitation method, in which urea was used as the precipitator. The as-synthesized sample is a mixture of CoTiO3 and rutile nanocrystallites with mean sizes of around 50 nm. It stron…
Application of Modified Coir Fiber as Eco-friendly Oil Sorbent Lignocellulosic fibers are attractive materials due to its abundance nature, sustainability and biodegradability. They are economical and have low processing energy requirements. Modification of these fibers to make them hydrophobic may allow them to be us…
The discussion of this chapter begins with the brief historical perspectives of natural rubber (NR); the demand of NR, competition of NR to synthetic rubber (SR) and filled-NR for engineering applications are unveiled in the following sections. Challenges to increase the yield of NR latex will be highlighted subsequen…
International audience
通过半固相合成方法得到一类新型的具柔性骨架的树状聚脂肪醚(PMDC)与DNA的嵌段共聚物, 也称为DNA-树状聚脂肪醚杂化体, 其结构通过了MALDI-TOF MS、HPLC和聚丙烯酰胺凝胶电泳(PAGE)表征. 研究证明, 通过调节DNA-树状聚脂肪醚杂化体的结构和组装的溶剂体系, 可以得到各种不同的有序聚集体(球形胶束、纳米纤维等), 这些组装形貌均通过透射电镜(TEM)、原子力显微镜(AFM)和动态光散射(DLS)进行表征; 荧光包裹实验和DNA互补配对实验不仅证明了疏水树状聚脂肪醚位于组装体内核、DNA处于外壳的组装机理, 也说明这类DNA-树状聚脂肪醚杂化体将在疏水药物运输和纳米技术等领域具有潜在的应用.
Diblock copolymers are a class of materials formed by the reactionof two linear polymers. The different structures taken on by thesepolymers grant them special properties, which can prove useful inapplications such as the development of new adhesives and asphaltadditives. We consider a model for the formation of diblo…
The design and synthesis of molecular-based materials displaying single-molecule magnet (SMM) property is currently a subject of worldwide research activity.A common strategy is the use of organic multi-dentate O-donor and/or N-donor ligands to assemble various spin carriers into simple complexes or polynuclear cluste…
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Co3O4 and NiCo2O4 spinels were successfully synthesized by simple sonochemical precipitation method. The above materials used as electrode materials for supercapacitor their structural and electrochemical responses were studied. The XRD results clearly evidence the formation of Co3O4 and NiCo2O4 cubic nanostructures.…
It is well-known that the degree of macrosegregation decreased with increasing the amount of equiaxed zone. However, the effect of size and morphology of equiaxed grains on the macrosegregation has not been understood. Thus, laboratory-scale experiments using Al-10 mass%Cu alloy have been carried out. The equiaxed str…
The Ni(OH)2 particles were synthesized by infinite dilute method. The as-prepared particles are α-Ni(OH)2, which are well dispersed and have a fish scale morphology. The electrochemical tests show that the particles have relatively high capacitance and excellent capacitive retention. The good structure and excellent p…
The BaTiO3–Bi(Mg1/2Ti1/2)O3–BiFeO3 [(1 − x − y)BT-xBMT-yBF] ceramics were prepared by a conventional solid–state synthesis, and their crystal structure and piezoelectric properties were investigated in details. Synchrotron X-ray diffraction (XRD) pattern revealed that a single perovskite phase was obtained for samples…
The aim of any drug delivery system is not only to deliver a drug to specific site of action but also to maintain its therapeutic concentration at the targeted site. Most of the drugs used in CNS disorders cannot cross the blood brain barrier (BBB) due to their large molecular size, less lipid solubility and p-glycopr…
Relaxor ferroelectric materials PZT-PZN and PZT-PNN were prepared by columbite method. The structural change was investigated by Synchrotron X-ray Absorption Spectroscopy (SXAS) at Zr L3-edge. The results show structural change of both systems affects to white line (WL) intensity significantly as revealed by simulated…
The electronic structure and the lattice dynamics of lead telluride (PbTe) are investigated by using the density functional theory. The thermoelectric properties are then calculated using the semi-classical Boltzmann theory. Moreover, the relationships among the thermoelectric properties, the electronic structure and…