Past is prologue for composite repair
Thicker laminate structure in new commercial passenger aircraft will affect maintainability. Vicki P. McConnell identifies possible changes in composite repair of these new designs.
Materials Literature
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Nanocomposites based on vermiculite clay and ternary blend of poly(L‐lactic acid), poly(methyl methacrylate), and poly(ethylene oxide)
Abstract Vermiculite (VMT) as clay was introduced into a ternary polymer blend composed of poly( L ‐lactic acid) (PLLA), poly(methyl methacrylate) (PMMA), and poly(ethylene oxide) (PEO), whose ternary miscibility was proven within low certain contents of PMMA and PEO in PLLA. VMT was incorporated to the ternary polyme…
Graphene Nanoribbon Spin Interconnects for Nonlocal Spin-Torque Circuits: Comparison of Performance and Energy Per Bit With CMOS Interconnects
Solid-state devices based on utilizing the electron spin for storing and manipulating information may pave the way for next-generation computers. In this paper, the performance and the energy dissipation of graphene spin interconnects in a nonlocal spin-torque (NLST) circuit are compared against those of the CMOS circ…
Conventional Electrospinning vs. Emulsion Electrospinning: A Comparative Study on the Development of Nanofibrous Drug/Biomolecule Delivery Vehicles
Over the past decade, intensive research has been conducted on electrospinning of fibrous tissue engineering scaffolds and their applications in body tissue regeneration. For providing multifunctions and/or enhancing the biological performance, drugs or biomolecules can be incorporated in electrospun fibers using norm…
Mechanical properties, density, and defect structure of VT1-0 titanium after intense plastic deformation due to screw and longitudinal rollings
The influence of screw rolling combined with standard methods of mechanothermal treatment on the homogeneity of the forming submicrocrystalline structure, density, and mechanical performance of VT1-0 commercial titanium is studied. It is shown that such a treatment carried out within optimal temperature and strain rat…
Poling temperature tuned electric-field-induced ferroelectric to antiferroelectric phase transition in 0.89Bi0.5Na0.5TiO3-0.06BaTiO3-0.05K0.5Na0.5NbO3 ceramics
We report the electric-field-induced ferroelectric (FEIN) to antiferroelectric (AFE) phase transition that is tuned by the poling temperatures in 0.89Bi0.5Na0.5TiO3-0.06BaTiO3-0.05K0.5Na0.5NbO3 (0.89BNT-0.06BT-0.05KNN) ceramics. Phase transition and pyroelectric behaviors of the ceramics were investigated as functions…
Study on the structural and physical properties of ZnO nanowire arrays grown via electrochemical and hydrothermal depositions
We report here the systematic study of well controlled ZnO nanowire arrays grown via two different chemical ways: electrodeposition and hydrothermal method, which are frequently used for low cost synthesis of ZnO nanowire arrays. Both methods consist of two elaboration steps: a seed layer ZnO was first deposited on th…
Microwave Joining of Natural Fiber Reinforced Green Composites<sup></sup>
Natural fiber based bio-composites are gaining prime importance these days because of their high strength to weight ratio and environmental benefits. An increase in the application spectrum of these materials necessitates cost effective high quality processing in order to meet the stringent design requirements. In the…
Synthesis and Characterization of Chemically Deposited Nanocrystalline CdSe Thin Film
The synthesis and characterization of nanocrystalline CdSe thin solid films are reported in this article. Chemical bath deposition, a direct low-cost technique that involves a cadmium salt solution, a complexing agent, and a chalcogen (selenium) source, was used to prepare thin films of CdSe at a temperature 70°C (343…
Origin of Blue Photoluminescence from Naturally Oxidized Porous Silicon
Upon the 325 nm excitation from a helium-cadmium laser, the photoluminescence (PL) from aged porous silicon was investigated with fluorescence spectroscopy. Each PL spectrum of the aged porous silicon films contained two luminescent bands, one of the luminescent bands peaked at about 466.7 nm whereas the other lumines…
Sol gel deposited CdO: In films
CdO thin films have great technological interest due to their high-quality electrical and optical properties. Mixed oxides of CdO have been used in photovoltaic devices, gas sensors, phototransistors etc. In this work, the Acrylamide route was used to deposit CdO: In films. XRD patterns of the undoped and indium-doped…
Low-Temperature Combustion Synthesis of Cordierite Powder and its Characteristic
The MgO-Al 2 O 3 -SiO 2 (MAS) glass powders have been synthesized by low-temperature combustion technique using magnesium nitrate, aluminium nitrate, silicic acid as material, urea as fuel. The crystallization process, sintering behavior and dielectric properties were investigated by means of DTA, XRD, TMA and SEM tec…
Hydrothermal Synthesis of Neodymium Orthophosphate with Controlled Structure and Morphology
NdPO 4 •nH 2 O nanorods with a pure hexagonal and monoclinic phase were controlled synthesized through a hydrothermal route at low temperature. By simply increasing the molar ratio of PO 4 /Nd, pure monoclinic NdPO 4 can be obtained at lower temperature of 180 °C. Furthermore, NdPO4•nH2O nanorods can be assembled into…
Effect of Storage on the Colloidal Properties of Room-temperature Prevulcanised Natural Rubber Latex
This paper reports on the study of the prevulcanisation of natural rubber latex (NRL) at room temperature. NRL was prevulcanised at room temperature using a zinc butyl xanthate [Zn(bxt) 2 ]–zinc diethyl dithiocarbamate [ZDC] accelerator system. High-temperature (55–60°C) prevulcanisation of NRL was also done using the…
Synthesis of Different Architectures Like Stars, Multipods, Ellipsoids and Spikes of Zinc Oxide by Surfactantless Precipitation
Zinc oxide with different morphologies like stars, multipods, ellipsoids and spikes was synthesized using zinc nitrate and sodium hydroxide in the absence of surfactants. Seed mediation was found to be essential for the formation of ZnO nanospikes. Synthesized ZnO samples were characterized by X-ray diffraction (XRD),…
Structurization of submonolayer carbon coatings deposited in a low-pressure microwave plasma on single-crystal silicon
Features of surface structurization of submonolayer carbon coatings deposited in highly ionized ultrahigh-frequency low-pressure plasma on silicon wafers with (111) and (100) crystallographic orientations are studied. It is shown that the size and surface density of nanostructured carbon formations are controlled by t…
<I>Ab Initio</I> Simulations on Electric Properties for Junctions Between Carbon Nanotubes and Metal Electrodes
The cluster approach based on the multiple scattering theory formalism, realistic analytical and coherent potentials, as well as effective medium approximation (EMA-CPA), can be effectively used for modeling of nanosized systems. This allows us to calculate the dispersion law E(k), electronic density of states, conduc…
Effect of magnetic field and pressure on charge-orbital ordering in Pr(Sr1−xCax)2Mn2O7 (x = 0.4 and 0.9) single crystals
The magnetic properties of half-doped Pr(Sr1−xCax)2Mn2O7 (x = 0.4 and 0.9) single crystals have been investigated under magnetic field (H) and hydrostatic pressure (P). Analysis of magnetization data reveals that, for x = 0.4 sample, only one charge-orbital ordering (CO-OO) transition occurs which decreases very slowl…
Luminescence Properties of Nano-Crystalline Ba3MgSi2O8:Eu2+, Mn2+ Phosphors
Ba3MgSi2O8:Eu2+, Mn2+ phosphors were synthesized by the sol-gel method and high temperature solid-state reaction method, respectively. XRD (X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), PL (photoluminescence spectra), and PLE (photoluminescence excitation spectra) were measured to characterize t…
Hydrogen migration in metals under the combined action of acoustic and ionizing radiation
The hydrogen migration in metals under the action of ionizing and acoustic radiation is considered. The joint action of ionizing and acoustic radiation is found to enhance the hydrogen migration in metals (“interference” effect). The hydrogen transport mechanism is determined by the interaction of ionizing radiation w…