Materials Literature
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Considering the exciton effect, the polarizability and second polarizability spectra of semiconducting single-wall carbon nanotubes (S-SWCNTs) have been calculated by PPP (Pariser, Parr, and Pople) approximation and the single-excitation configuration interaction (single-CI) method and sum-over-state method. We have s…
Kurzfassung Die meisten Werkzeuge unterliegen im Einsatz einer komplexen mechanischen Beanspruchung, wie z. B. Schneidstempel, die häufig einer zyklischen schwellenden Zug-,Druck- und Biegebeanspruchung ausgesetzt sind. Da in den letzten Jahren der Wettbewerbsdruck durch zunehmende Billigproduktionen in Niedriglohnlän…
The technologies of superhard materials production, including those for industrial synthesis of diamond and cubic boron nitride at high pressure and high temperature conditions, depend on the operator experience. Moreover, these manually operated processes usually vary in terms of yield and quality of the final produc…
Unidirectional pore structured porous mullite composite has been fabricated using a TBA-based freeze-gelcasting of coal fly ash/alumina slurries. After sintering at 1300-1500o C, the shrinkage, apparent porosity and compressive strength of the resulting porous composites were investigated. After sintering at 1500o C,…
Pristine multiwall carbon nanotubes (MWNT) (synthesised using CVD approach) and poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH PPV) based composites were prepared using a solution blending approach by employing various nanotube weight fractions. The prepared composites have been characterised using…
Benzoic acid (BA) is a common pollutant in industrial wastewater. It has high toxicity and is a threat to human health and the ecosystem. Mg-Al-CO3 hydrotalcites (HTs) and their calcined products (CHTs) are good ion exchangers/adsorbents for removal of toxic anions from contaminated water. In this study, HTs with diff…
Fly ash can improve the physical and mechanical properties of the magnesium phosphate cement (MPC) paste. The influence of fly ash on the strength, the mortar fluidity, the durability and the setting time of MPC paste were studied in this paper. The results show that: The function of fly ash to the MPC is as followed:…
Ta-doped SnO 2 (Sn 0.99 Ta 0.01 O 2 ; TTO) films were successfully sputter deposited with a high mobility of 49 cm 2 V -1 s -1 on glass coated with anatase-TiO 2 seed layers. The high mobility enabled the achievement of a film resistivity of 5.9 ×10 -4 Ω cm. This value of resistivity is one of the lowest ever reported…
In magnets based in phases with high magnetocrystalline anisotropy like Nd2Fe14B or SmCo5 there is a competition between magnetostatic energy and domain wall energies. If the grain size is large, the formation of domain walls is energetically favorable. When the formation of domain walls is an unfavorable process, coe…
Zn–ZnO superhydrophobic thin films have been prepared by thermal oxidation of sputtered Zn. The superhydrophobicity observed in these coatings is attributed to multiscale roughness in the nanometric range only. The higher scale roughness was due to the combination of nanoclusters (solid regions) and air gaps while the…
Abstract In 2006, our group reported the fabrication of ultra‐long single‐crystal ZnAl 2 O 4 spinel nanotubes, starting from ZnO/Al 2 O 3 core–shell nanowires, involving the nanoscale Kirkendall effect. In this feature paper, we introduce our up‐to‐date results on the design of porous and hollow 1D nanostructures foll…
Ultra-high molecular weight polyethylene (UHMWPE) is a polyethylene with a very long chain, which provides excellent features, however it makes the processing difficult due to high melt viscosity. Many studies intend to found out means to make its processing easier. Recently, the high-energy mechanical milling has bee…
One way to develop a new composite material or to improve its performance is to reinforce the matrix with a stronger dispersive phase. In principal, nanodiamonds can be used as reinforcement of composites owing to high surface energy, which allows an effective structure interaction with most utilized matrices. In this…
A simple and novel method of synthesis of gold and silver nanoparticles from their salt solutions by amino acid reduction in the presence of β-Cyclodextrin as capping and stabilizing agent has been successfully carried out. Characterization is done by UV spectroscopy and High-Resolution Transmission Electron Micrograp…
Scatterometry has been used extensively for the characterization of critical dimensions (CDs) and detailed sidewall profiles of periodic structures in microelectronics fabrication processes. In most cases devices are designed to be symmetric, although errors could occur during the fabrication process and result in und…
Vascular tissue engineering should provide more biocompatible and functional conduits than synthetic vascular grafts. Understanding cell-scaffold interactions and developing an efficient delivery system for growth factors and other biomolecules to control the signaling between the cells and the scaffold are fundamenta…
A state-of-the-science review was undertaken to identify and assess sampling and analysis methods to detect and quantify selected nanomaterials (NMs) in the ambient atmosphere. The review is restricted to five types of NMs of interest to the Office of Research and Development Nanomaterial Research Strategy (U.S. Envir…
Carbon foams fall in the class of porous, cellular high temperature non-metallic materials with interconnected porosity. In present work, carbon foams have been prepared using commercially available polymeric foams as templates and thermosetting phenolic resin as carbon source. The prepared preform has been carbonized…
The effect of two basic topological defects, mitosis and the Stone-Wales defect, is studied in the graphene structure. The topological rules of the curvatures due to the occurrence of the defects in different arrangements are determined. Despite the fact that the causes and the probability of these topological defects…
A new electric application method was developed to prepare epoxy/organoclay nanocomposite for the electrical insulation in the ac electric fields and it could be also used in the field of various viscous polymer/organoclay systems. The applied ac electric field condition was as follows; (1) inter-electrode distance: 4…